JP7010164B2 - Feeding part structure, antenna device and feeding part assembly method - Google Patents

Description

The present invention relates to a feeding portion structure for feeding power to an antenna element, an antenna device having this feeding portion structure, and a method for assembling the feeding portion.

Conventional feeding unit structures and antenna devices include those related to monopole antennas and dipole antennas (see, for example, Patent Documents 1 to 4). Monopole antennas and dipole antennas are general-purpose for various types of wireless devices. Further, the antenna of a wireless device such as a short wave (HF: High Frequency) band has a large size and is mainly used outdoors.

The feeding portion structure disclosed in Patent Document 1 has an antenna element inserted in a dielectric. The dielectric has a removable shape, and the impedance of the antenna can be adjusted by replacing it with a dielectric having different electrical characteristics. Such a feeding unit structure is intended for an antenna built in the housing of a device such as a wireless LAN or Bluetooth (registered trademark), and the holding structure of the antenna is mainly on the housing side.

The feeding portion structure disclosed in Patent Document 2 has a partially coaxial structure, a dielectric is inserted in the conductive outer cylinder, and a matching coil is connected to the antenna element instead of the core wire. Since the coaxial structure operates as an impedance modifier, it contributes to wideband impedance matching. The antenna element is covered with a dielectric. The antenna element is held outside the coaxial structure, and the antenna element is covered with a dielectric band. Since a part of the feeding part has a coaxial structure, various dimensions are determined by electrical conditions. It targets antennas for mobile communications such as in-vehicle phones.

The feeding portion structure disclosed in Patent Document 3 is similar to the feeding portion structure disclosed in Patent Document 1. That is, the feeding portion structure disclosed in Patent Document 3 has an antenna element inserted in a dielectric. The antenna device disclosed in Patent Document 3 realizes the holding of the antenna element by utilizing a non-metal branch line in order to make it possible to cope with a short wave band in which the antenna size becomes large. Since it is difficult to replace the dielectric, the impedance of the antenna is adjusted by a matching circuit placed near the feeding part. Further, the antenna device disclosed in Patent Document 3 has a structure in which strength is secured by utilizing a non-metal branch line.

The feeding portion structure disclosed in Patent Document 4 has a structure in which the dielectric between the antenna elements is fixed with bolts and the dielectric is exposed to the outside. Even in the short wave band where the strength of the feeding part is high and the antenna size is large, the antenna device having the feeding part structure can stand on its own while eliminating the need for a non-metal branch line. Further, since the feeding portion structure disclosed in Patent Document 4 has the dielectric of the feeding portion fixed with bolts, it does not depend on reinforcing parts such as non-metal branch lines. Therefore, Patent Documents 1 to 3 It can be said that the antenna device disclosed in the above is also compatible as a short-wave band antenna device.

Japanese Unexamined Patent Publication No. 2007-81903 Japanese Unexamined Patent Publication No. 5-347508 Japanese Unexamined Patent Publication No. 2009-105806 WO2014 / 136543

However, the conventional power feeding unit structure as disclosed in Patent Documents 1 to 4 has a problem that it does not presuppose the protection of the power feeding unit (for example, the protection of the dielectric). That is, if the dielectric of the feeding portion is exposed to the outside and the dielectric is not protected, the characteristics of the dielectric are deteriorated by ultraviolet rays and water, so that there is a problem that the antenna characteristics may be deteriorated. For example, the feeding portion structure disclosed in Patent Document 1 is premised on being built in a housing, but when applied to a short-wave band antenna device, the dielectric of the feeding portion is exposed to the outside.

Further, since the feeding portion structure disclosed in Patent Document 1 is a structure in which the antenna element is simply inserted into the dielectric, there is a possibility that sufficient strength cannot be obtained when the antenna size is large. In addition, there is a problem that it is difficult to replace the dielectric itself, and the types of dielectrics are limited in terms of strength, and there is a possibility that sufficient electrical performance cannot be obtained. When the feeding portion structure disclosed in Patent Document 2 is applied to an antenna device in a short wave band having a large antenna size, the strength may be insufficient due to the low degree of freedom in mechanical design. In addition, the internal matching coil may not be easily changed.

The present invention has been made to solve the above-mentioned problems, and is an assembly of a feeding section structure, an antenna device, and a feeding section having a simple structure and having a high feeding section and high environmental resistance. The purpose is to get a method.

The feeding portion structure and the antenna device according to the present invention are a rod-shaped conductor and a box-shaped conductor having an opening, and the base end portion of the rod-shaped conductor is housed therein and electrically insulated from the base end portion. In this state, a support conductor that supports the base end portion and a feeding line in which one line is electrically connected to the rod-shaped conductor and the other line is electrically connected to the support conductor are provided. It is characterized by.

In the method of assembling the power feeding portion according to the present invention, the base end portion of the rod-shaped conductor is housed inside a support conductor which is a box-shaped conductor having an opening, and the base end portion is electrically insulated from the base end portion. It is characterized by including a rod-shaped conductor installation step of supporting the base end portion and a feeding portion forming step of electrically connecting one line to the rod-shaped conductor and electrically connecting the other line to the support conductor. Is to be.

According to the present invention, by accommodating the base end portion of the rod-shaped conductor inside the support conductor, it is possible to obtain a feeding portion structure capable of protecting the structure of the feeding portion, an antenna device, and a method for assembling the feeding portion. ..

It is a block diagram of the antenna device which concerns on Embodiment 1 of this invention. It is a block diagram (the figure which enlarged the periphery of the feeding part) of the comparative example with the power feeding part structure which concerns on Embodiment 1 of this invention. It is a block diagram (the view which enlarged the periphery of the feeding part) of the power feeding part structure which concerns on Embodiment 1 of this invention. It is explanatory drawing of the assembly method of the feeding part which concerns on Embodiment 1 of this invention. It is explanatory drawing of the assembly method of the feeding part which concerns on Embodiment 1 of this invention. It is explanatory drawing of the assembly method of the feeding part which concerns on Embodiment 1 of this invention. It is explanatory drawing of the assembly method of the feeding part which concerns on Embodiment 1 of this invention. It is a block diagram of the antenna device which concerns on Embodiment 1 of this invention. It is sectional drawing (the view which enlarged the periphery of the feeding part) of the power feeding part structure which concerns on Embodiment 1 of this invention. It is sectional drawing (the view which enlarged the periphery of the feeding part) of the power feeding part structure which concerns on Embodiment 1 of this invention. It is a block diagram (the view which enlarged the periphery of the feeding part) of the power feeding part structure which concerns on Embodiment 1 of this invention. It is sectional drawing (the view which enlarged the periphery of the feeding part) of the power feeding part structure which concerns on Embodiment 2 of this invention. It is sectional drawing (the view which enlarged the periphery of the feeding part) of the power feeding part structure which concerns on Embodiment 2 of this invention. It is a block diagram of the antenna device which concerns on Embodiment 3 of this invention. It is sectional drawing (the peripheral view of the feeding part enlarged) of the power feeding part structure which concerns on Embodiment 4 of this invention. It is a block diagram of the antenna device which concerns on Embodiment 4 of this invention.

Embodiment 1.
Hereinafter, a method of assembling the feeding unit structure, the antenna device, and the feeding unit according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 11. In the figure, the same or equivalent configurations may be designated by the same reference numerals and description thereof may be omitted. The configuration of the present invention described in the embodiment is an example thereof, and the present invention is not limited to the one shown in the embodiment. Combination with other embodiments is also possible. Further, FIG. 2 is a configuration diagram of a power feeding unit structure (hereinafter referred to as “comparative example feeding unit structure”) which is a comparative example with the feeding unit structure according to the first embodiment.

In the present application, embodiments and comparative examples will be described with reference to the antenna structure shown in FIG. 1. However, the present application may be applied to, for example, a monopole antenna having the antenna structure of FIG. 1 or a dipole antenna described later. However, it is not limited to these. That is, the antenna device according to the first embodiment includes the feeding portion structure according to the first embodiment, the first antenna element having the rod-shaped conductor 1 of the feeding portion structure described later, and the support conductor 2 of the feeding portion structure described later. It can be said that the second antenna element is provided. By selecting the shape of the second antenna element, the operation of a monopole antenna or a dipole antenna is realized.

In FIGS. 1 to 11, the rod-shaped conductor 1 is a main mast 1 which is an antenna element of an antenna device. The support conductor 2 is a box-shaped conductor having an opening 2a, and the base end portion 1a is housed inside the base end portion 1a and electrically insulated from the base end portion 1a. It is a support (a metal box 2 having an opening 2a). The metal box 2 can be said to be a metal cylinder 2 in which the opening on the opposite side of the opening 2a is closed. The support conductor 2 is also an antenna element. The feeding line 3a is one line (signal line 3a) electrically connected to the rod-shaped conductor 1. The feeding line 3b is the other line (ground line 3b, GND line 3b) electrically connected to the support conductor 2. The feeding line 3a and the feeding line 3b are fed by the high frequency voltage source 3. It is preferable that the high frequency voltage source 3 is arranged at a position away from the feeding line 3a and the feeding line 3b via a coaxial line or the like. In the figure, a case where the feeding line 3a and the feeding line 3b are directly connected to the high frequency voltage source 3 is illustrated. Further, the feeding line 3a and the feeding line 3b may be coaxial lines.

In FIGS. 1 to 11, the ground wire 4 is linear and is electrically connected to the support conductor 2. A plurality of ground lines 4 are formed, and each of the plurality of ground lines 4 extends radially around the support conductor 2. In the figure, the case where the ground line 4 is four is illustrated. The ground wire 4 and the support conductor 2 are electrically connected to each other. The dielectric 5 is an insulator (dielectric) arranged (filled) inside the support conductor 2. It can be said that the support conductor 2 has a dielectric 5 formed between the support conductor 2 and the proximal end portion 1a. A dielectric 5 is arranged around the base end portion 1a to insulate the rod-shaped conductor 1 and the support conductor 2. In other words, the dielectric 5 insulates the antenna elements from each other. The dielectric 5 is formed with a recess (hole) into which the rod-shaped conductor 1 is inserted at the end portion on the opening surface 2a side. Other than the dielectric 5, it is a metal.

In the comparative example feeding section structure shown in FIG. 2, the rod-shaped conductor 1, the support conductor 2, and the dielectric 5 in the feeding section structure of the antenna device shown in FIG. 1 are used, and the rod-shaped conductor 6 (flange 7) in the comparative example feeding section structure, respectively. It can be said that the structure is replaced with the base 8 and the dielectric 9.

Here, the operation of the feeding unit will be described. The operation of the feeding section is basically the same in the feeding section structure of the present application and the feeding section structure of the comparative example. The high-frequency voltage source 3 generates an electric field between the rod-shaped conductor 1 (flange 7) and the support conductor 2 (base 8), and operates as a feeding unit. As a result, a high-frequency current flows through the rod-shaped conductor 1 (flange 7), the support conductor 2 (base 8), and the ground wire 4, and the entire component operates as an antenna device.

The high frequency voltage source 3 and the rod-shaped conductor 1 (flange 7) are electrically connected by the feeding line 3a, and the high frequency voltage source 3 and the support conductor 2 (base 8) are electrically connected by the feeding line 3b. Has been done. In FIG. 2, the ground line 4 is not shown. In reality, a plurality of ground lines 4 are formed, and each of the plurality of ground lines 4 extends radially around the base 8. The ground wire 4 and the base 8 are electrically connected to each other. Further, although the illustration of the comparative example antenna device, which is an antenna device to which the comparative example feeding section structure is applied, is omitted, the configuration is similar to that of the antenna device shown in FIG. 1 except for the periphery of the feeding section structure.

FIG. 2A is an enlarged side view of the periphery of the comparative example feeding portion structure, and FIG. 2B is a cross-sectional view showing an inserted state of the two bolts 10 in FIG. 2A. The comparative example feeding section structure, which is a comparative example shown in FIG. 2, is an example of applying a bolt-fixed feeding section structure to a monopole antenna. In FIG. 2, the rod-shaped conductor 6 is a main mast which is an antenna element of a comparative example antenna device. The flange 7 corresponds to the base end portion 7 of the rod-shaped conductor 6. The base 8 serves as an antenna element of the comparative example antenna device. The dielectric 9 insulates between the antenna elements, that is, the rod-shaped conductor 6 (flange 7) and the base 8 from each other. The bolt 10 fixes the flange 7, the base 8, and the dielectric 9 to each other. The insulator 11 is an insulator (dielectric). Specifically, it is an insulator 11 (insulating material 11) for preventing the flange 7 and the base 8 from being short-circuited via the bolt 10.

In FIG. 2, the nut 12 is arranged between the tip of the bolt 10 and the base 8. Except for the dielectric 9 and the insulator 11, it is a metal. Therefore, strictly speaking, it can be said that the insulator 11 prevents the flange 7 and the base 8 from being short-circuited via the bolt 10 or the nut 12. Therefore, the insulator 11 also exists between the head of the bolt 10 and the flange 7, and also exists between the nut 12 and the base 8. Since the nut 12 is arranged in the recess formed on the surface of the base 8 opposite to the side where the dielectric 9 is present, the nut 12 is placed on the surface of the base 8 opposite to the side where the dielectric 9 is present. , There are no protrusions due to the bolt 10 or nut 12.

In the comparative example feeding section structure shown in FIG. 2, many parts such as bolts 10, insulators 11, and nuts 12 may be required for fixing between the antenna elements. Further, in the comparative example feeding portion structure shown in FIG. 2, there may be many places where the dielectric 9 is exposed to the outside. Therefore, in order to improve the environmental resistance to water and ultraviolet rays, it is effective to apply sealing or coating to the dielectric 9. However, the large number of parts and the large number of sealing and painted parts may increase the cost including workability. In addition, there are other concerns about the large number of parts and the large number of sealing and painted parts.

Here, as an example of another concern, a case where the comparative example feeding unit structure (comparative example antenna device) is installed in a strong wind area or a sandy area will be described. In strong wind areas and sandy areas, scattered objects such as sand often collide with the power feeding unit structure (comparative example antenna device) of the comparative example. This scattered material plays a role like sandblasting, and peeling occurs at the coating and sealing points of the comparative example feeding part structure (comparative example antenna device). Such peeling particularly affects the feeding portion, and there is a possibility that water may be inundated during precipitation and the antenna characteristics may be deteriorated. As a countermeasure against scattered objects, it is effective to provide a cover on the feeding part. However, there is a risk that the design man-hours will increase, the cost will increase, and the strength of the antenna will decrease due to the increase in the wind receiving area. However, this does not mean that the provision of a cover on the feeding unit structure (antenna device) according to the present application is excluded.

Further, in the comparative example feeding section structure shown in FIG. 2, the electric field generated by the high-frequency voltage source 3 is not only disturbed by the presence of the bolt 10, but also leaks from the insulator 11 to the top side and the ground side, so that the antenna performance deteriorates. There is a risk. In the comparative example feeding section structure (comparative example antenna device), the structure in which the electric field propagates in a complicated manner is a factor that makes it difficult to obtain the accuracy of electromagnetic field analysis. There is also a risk of pressure and high costs. However, this does not mean that no bolts or nuts are used in the feeding part structure (antenna device) according to the present application.

Next, the feeding section structure and the antenna device according to the first embodiment will be described with reference to FIGS. 1 and 3. In the antenna device shown in FIG. 1, the high frequency voltage source 3, the feeding line 3a and the feeding line 3b are not shown, but the high frequency voltage source 3, the feeding line 3a and the feeding line 3b have the same configuration as shown in FIG. It is the same. FIG. 3A is an enlarged perspective view of the periphery of the feeding portion structure, and FIG. 3B is a cross-sectional view showing a state in which the inside of the box-shaped support conductor 2 in FIG. 3A can be seen. In FIG. 3B, it can be seen that the flat plate portion 2b is fixed to the support conductor 2 by the two bolts 13. In FIG. 3, the flat plate portion 2b is formed on the side opposite to the opening 2a of the support conductor 2. The flat plate portion 2b may be a part of the structure of the support conductor 2. The bolt 13 fixes the flat plate portion 2b to the support conductor 2.

Further, since the bolt 13 is arranged in the recess formed on the surface of the flat plate portion 2b opposite to the side where the support conductor 2 (dielectric 5) exists, the support conductor 2 (dielectric) is arranged in the flat plate portion 2b. There is no protrusion due to the bolt 13 on the surface opposite to the side where 5) is present. In the figure, the flat plate portion 2b is fixed to the bottom of the box-shaped support conductor 2 with bolts 13, but the support conductor 2 and the flat plate portion 2b may be integrally formed. Further, the support conductor 2 is a cylinder (the metal cylinder 2 described above), and the flat plate portion 2b is provided on the opposite side of the opening 2a so that the flat plate portion 2b is used as a lid, and the support conductor 2 and the flat plate portion 2b form a box. The support conductor 2 may be formed in the shape of a support conductor 2.

In FIG. 3, a plurality of ground wires 4 extending radially are electrically connected to a flat plate portion 2b formed on the opposite side of the opening 2a of the support conductor 2. Of course, the plurality of ground wires 4 extending radially without forming the flat plate portion 2b may be electrically connected to the opposite side of the opening 2a of the support conductor 2. Further, regardless of the presence or absence of the flat plate portion 2b, the plurality of ground wires 4 extending radially may be electrically connected to the opening 2a of the support conductor 2. It will be described later with reference to FIGS. 8 and 9.

The specific structure of the feeding part structure (antenna device) according to the first embodiment will be described with reference to FIG. A flat surface portion 2b corresponding to a base serving as a ground for the feeding portion structure (antenna device) is installed in the feeding portion structure (antenna device). A support conductor 2 which is a metal box having an opening 2a and a ground wire 4 are electrically connected to the flat surface portion 2b. The support conductor 2 (metal box 2) is located substantially in the center of the flat surface portion 2b, and is fixed by a bolt 13 from the back side of the flat surface portion 2b. Since the screw hole for the bolt 13 is provided in the wall thickness of the support conductor 2 (metal box 2), the bolt 13 does not protrude from the inner surface of the support conductor 2 (metal box 2).

The ground wire 4 of the antenna device is a metal wire provided with a terminal. In FIG. 3, it is connected to the flat surface portion 2b by an unmarked screw. The number of ground lines 4 is four, and it is preferable to lay them at approximately equal angles or in four directions at equal angles. It may be the ground line 4 of. When the ground line 4 is (n + 1), it is preferably laid at substantially the same angle or at the same angle in the n direction. Here, n is an integer of 1 or more.

The lower part of the rod-shaped conductor 1 is inserted into the support conductor 2 (metal box 2), but the dielectric 5 is inserted into the rod-shaped conductor 1 and the support conductor 2 (metal box 2) so as not to be short-circuited with the support conductor 2 (metal box 2). It is inserted between and. The rod-shaped conductor 1, the dielectric 5, and the support conductor 2 (metal box 2) are fixed to each other by an adhesive. The rod-shaped conductor 1 and the support conductor 2 (metal box 2) are electrically connected to the high-frequency voltage source 3 via the feeding line 3a and the feeding line 3b, respectively. Although not shown, it is preferable that the support conductor 2 (metal box 2) and the top surface of the dielectric 5 are covered with a sealing material. The top surface of the support conductor 2 (metal box 2) corresponds to the opening 2a. Although not shown, it is preferable to fix the flat surface portion 2b to the ground with a pile or the like. The high-frequency voltage source 3 includes a balun and a matching circuit, and acts as an intermediary between the antenna device and the transceiver.

In the (antenna device) according to the first embodiment, the fixed position of the support conductor 2 (metal box 2) is set to be approximately the center of the flat surface portion 2b, but the present invention is not limited to this. Further, the number of ground lines 4 is 4, and the laying directions are generally equal angles, but as described above, the number is not limited to 4 lines and 4 directions. Further, although the bolt 13 is used as the fixing means for the support conductor 2 (metal box 2) and the flat surface portion 2b, other fixing means may be used as long as the conductor or the insulator does not protrude into the support conductor 2 (metal box 2). .. In FIG. 3B, the dielectric 5 is filled in the support conductor 2 (metal box 2). Of course, the dielectric 5 may be partially formed, or the dielectric 5 may be divided. When the dielectric 5 exists partially or divided in the support conductor 2 (metal box 2), the difference in the coefficient of thermal expansion between the metal support conductor 2 and the dielectric 5 It is expected to have the advantage of being easy to deal with and the reduction of the processing cost and material cost of the dielectric 5. Further, in FIGS. 1 and 3A, the shape of the flat surface portion 2b is drawn as a square, but the shape is not limited to the square. The ground wire 4 is a metal wire, but a protective film may be formed on the surface thereof.

The operation of the feeding unit structure (antenna device) according to the first embodiment will be described with reference to FIGS. 1 and 3. The signal line 3a of the high frequency voltage source 3 is connected to the rod-shaped conductor 1, and the ground wire 3b is connected to the support conductor 2 (metal box 2). The ground wire 4 is connected to the support conductor 2 (metal box 2) via the flat surface portion 2b, and the support conductor 2 (metal box 2), the flat surface portion 2b, and the ground wire 4 are all grounded (GND) of the antenna. Will be. The high-frequency voltage source 3 generates a high-frequency electric field inside the support conductor 2 (metal box 2), and a high-frequency current flows through all the metal components of FIGS. 1 and 3 to operate as an antenna device.

The dielectric 5 is indispensable for the structure of the feeding portion, but is inferior to the metal in terms of environmental resistance and strength. The feeding portion structure (antenna device) according to the first embodiment is configured such that a part of the antenna element is covered with the dielectric 5 and the dielectric 5 is mostly covered with metal. It is a structure that compensates for the disadvantages of the dielectric 5 with a metal exoskeleton (support conductor 2). Even in a short-wave band wireless device that has a large size of an antenna device and is used outdoors, bolts are not required for fixing the dielectric 5, the number of parts is small, and the structure of the feeding portion can be simplified. Therefore, the feeding unit structure (antenna device) according to the first embodiment has excellent environmental resistance, high strength, and good electromagnetic field analysis accuracy, so that the design quality is high and the cost can be reduced. Details will be described below.

As shown in FIGS. 1 and 3, the dielectric 5 is mostly covered with the support conductor 2 (metal box 2), and the support conductor 2 has low strength and low environmental resistance. (Metal box 2) has an exoskeleton structure that supplements from the outside. The load of the rod-shaped conductor 1 goes downward and the moment goes sideways, but since these are all regions where the support conductor 2 (metal box 2) exists, the rod-shaped conductor 1, the dielectric 5, and the support conductor 2 ( The metal boxes 2) can be easily fixed to each other with an adhesive. Although bolts 13 are used to fix the support conductor 2 (metal box 2) and the flat surface portion 2b, as shown in FIG. 3, the support conductor 2 (metal box 2) does not protrude to the inner surface, so the fixing is strong. However, the internal electric field is not disturbed. Further, since it is easy to use only the metal of the support conductor 2 (flat plate portion 2b) around the bolt 13, no insulator is required around the bolt 13, and the leakage electric field penetrates into the ground and causes a loss. There is no such thing.

As shown in FIGS. 1 and 3, the part where the dielectric 5 is not covered with the support conductor 2 (metal box 2) is only a very small part on the top side, and even when sealing, only a very small part is required. Can be done. Therefore, the feeding portion structure (antenna device) according to the first embodiment is much less likely to have the sealing peeled off than the comparative example feeding portion structure (comparative example antenna device). Further, the reason why the sealing is unlikely to be peeled off is that in the feeding unit structure (antenna device) according to the first embodiment, the collision of scattered objects from the lateral direction (horizontal direction, the direction in which the ground line 4 extends) occurs. , The dielectric 5 may be protected by a support conductor 2 (metal box 2) extending in the vertical direction. This is because the scattered matter due to the wind arrives mainly from the horizontal direction (horizontal direction, the direction in which the ground line 4 extends).

The power feeding portion structure according to the first embodiment includes a rod-shaped conductor 1, a support conductor 2, and a dielectric 5, and one end of the box-shaped or tubular support conductor 2 is an opening (opening 2a) and the other end is a conductor plate. Shielded with, a part of the rod-shaped conductor 1 (base end portion 1a) is inside the support conductor 2, and the dielectric 5 is between the support conductor 2 and the rod-shaped conductor 1. The rod-shaped conductor 1 and the support conductor 2 are connected to a high-frequency voltage source 3. The antenna device according to the first embodiment is used as an antenna device as a feeding part of the antenna device when a high frequency voltage is applied from the high frequency voltage source 3 to the rod-shaped conductor 1 and the supporting conductor 2 of the feeding part structure according to the first embodiment. Operate.

Due to such a configuration, the feeding portion structure (antenna device) according to the first embodiment can easily reduce the number of parts, and the exposed portion of the dielectric 5 having difficulty in environmental resistance is minimized. At the same time, it becomes a low-risk position. As will be described later, the assembly method (the method of assembling the feeding unit according to the first embodiment) is also simple, and the structure is also simplified. Therefore, the feeding unit structure (antenna device) according to the first embodiment has excellent environmental resistance, high strength, high design quality due to the high accuracy of electromagnetic field analysis, and cost reduction can be easily realized.

Next, the method of assembling the power feeding unit according to the first embodiment will be described with reference to FIGS. 4 to 7. The method for assembling the power feeding unit according to the first embodiment is a method for assembling the power feeding unit structure according to the first embodiment. In FIGS. 5 and 6, the upper element portion 1b is a part of the rod-shaped conductor 1. Specifically, in the feeding portion structure (antenna device) according to the first embodiment, the rod-shaped conductor 1 may be a separate body from the proximal end portion 1a and the upper element portion 1b which is a portion other than the proximal end portion 1a. .. The pointed head 1c is a part of the proximal end portion 1a.

Specifically, in the feeding portion structure (antenna device) according to the first embodiment, the proximal end portion 1a has at least a cusp 1c protruding (exposed) from the opening 2a, and the cusp 1c is the upper portion. It may be fitted with the element portion 1b to form the rod-shaped conductor 1. Further, the upper element portion 1b may be fitted with the pointed head 1c inserted into the hole formed at the end portion on the side of the support conductor 2. If the upper element portion 1b has a tubular shape, it can be said that the cylinder is a hole into which the pointed head 1c is inserted. The fitting (connection) between the upper element portion 1b and the base end portion 1a may be inserted or fastened with a bolt or the like.

The method for assembling the feeding portion according to the first embodiment includes a rod-shaped conductor installation step and a feeding portion forming step. In addition, before the rod-shaped conductor installation step, the support conductor installation step of installing the support conductor 2 at the place where the power supply structure (antenna device) is installed may be configured as the configuration of the power supply unit assembly method according to the first embodiment. 4 (a) and 5 (a) are cross-sectional views showing a state before the rod-shaped conductor installation process. 4 (b), 5 (b), and 7 (b) show the base end portion 1a of the rod-shaped conductor 1 inside the support conductor 2 which is a box-shaped conductor having an opening 2a by the rod-shaped conductor installation step. It is sectional drawing which shows the state which the support conductor 2 supported the base end part 1a (the rod-shaped conductor 1) with the dielectric material 5 in the state which housed and electrically insulated from the base end part 1a.

In FIGS. 4 (c), 5 (c), and 7 (c), one line (feed line 3a, signal line 3a) is electrically connected to the rod-shaped conductor 1 by the feeding portion forming step, and the other line is connected. It is sectional drawing which shows the state which (feeding line 3b, ground line 3b) are electrically connected to the support conductor. FIGS. 4 (c), 5 (c), and 7 (c) also show a state in which the ground wire forming step of electrically connecting the ground wire 4 to the support conductor 2 (flat plate portion 2b) has been completed. .. The ground wire 4 may be electrically connected to the opening 2a. The ground wire forming step may also be configured as the method for assembling the feeding unit according to the first embodiment. The cross-sectional views of FIGS. 4, 5, and 7 are cross-sectional views showing the inserted state of the two bolts 13 or the holes for the two bolts 13. Note that FIG. 6 is a configuration diagram showing an intermediate stage of the rod-shaped conductor installation process of the method of assembling the feeding portion having the rod-shaped conductor 1 divided into the base end portion 1a and the upper element portion 1b (enlarged view of the periphery of the feeding portion). ).

As shown in FIGS. 4 (a) and 4 (b) and FIGS. 5 (a) and 5 (b), in the rod-shaped conductor installation step, even if the base end portion 1a of the rod-shaped conductor is inserted into the inside from the opening 2a. good. Further, as shown in FIGS. 5 (b) and 5 (c), in the rod-shaped conductor installation step, the rod-shaped conductor is a separate body from the base end portion 1a and the upper element portion 1b which is a portion other than the base end portion 1a. 1 is installed, and after the base end portion 1a is supported by the support conductor 2 (FIG. 5 (b)), the pointed head of the base end portion 1a protruding (exposed) from the opening 2a. The upper element portion 1b may be fitted to 1c (FIGS. 6 and 5 (c)).

Although not shown, the rod-shaped conductor installation step is to install the rod-shaped conductor 1 in which the base end portion 1a and the upper element portion 1b, which is a portion other than the base end portion 1a, are separate bodies. After fitting the upper element portion 1b to the pointed head 1c of 1a, the base end portion 1a may be supported by the support conductor 2 via the dielectric 5. In this case, it goes without saying that it can be applied to the feeding portion structure shown in FIGS. 4 and 7.

In the rod-shaped conductor installation process when the upper element portion 1b and the pointed head 1c are to be fitted, it is conceivable that the pointed head 1c is inserted into the hole formed at the end of the upper element portion 1b and fitted. Be done. In this case, the hole formed at the end of the upper element portion 1b may match the shape of the pointed head 1b as shown in FIGS. 5 (b) and 5 (c), or the above-mentioned cylinder as shown in FIG. The pointed head 1c may be inserted into the cylinder of the shaped upper element portion 1b and fitted.

That is, the feeding portion structure (antenna device) according to the first embodiment may have a split structure in which the upper portion of the rod-shaped conductor 1 is the upper element portion 1b and the lower portion is the base end portion 1a. The pointed head 1c may be integrated with or separate from the proximal end portion 1a. The rod-shaped conductor 1 has a divided structure, the base end portion 1a is embedded in the support conductor 2 (metal box 2), and the upper element portion 1b has a separable structure. The base end portion 1a (pointed head portion 1c) has a structure that can be inserted into the upper element portion 1b, and both can be connected.

By dividing the rod-shaped conductor 1 and embedding only the lower base end portion 1a in the support conductor 2 (metal box 2) in this way, the workability of the feeding portion is improved. In the case of a portable antenna device, it is generally assembled at the place of use, so the separable structure enhances the affinity for the portable antenna. When the rod-shaped conductor 1 (upper element portion 1b) and the support conductor 2 (metal box 2) are connected to the high-frequency voltage source 3, the proximal end portion 1a and the pointed head portion 1c may be insulators. Although not shown, of course, the feeding line 3a (signal line 3a) of the high-frequency voltage source 3 may be electrically connected to the proximal end portion 1a (pointed head 1c). In this case, the base end portion 1a (pointed head portion 1c) is made of a conductive material such as metal. Further, the fitting (connection) between the upper element portion 1b and the proximal end portion 1a (pointed head portion 1c) is electrical.

Although not shown, the rod-shaped conductor installation step may be to fit the base end portion 1a to the tip head provided at the end portion of the upper element portion 1b. In the feeding portion structure according to the first embodiment, the upper element portion 1b has a tip portion 1c at the end portion, and the tip end portion 1c is fitted with the base end portion 1a to form a rod-shaped conductor 1. .. Further, the proximal end portion 1a is fitted with the pointed head 1c inserted into the hole formed at the end portion on the side of the opening portion 2a. The fitting (connection) between the upper element portion 1b and the base end portion 1a may be inserted or fastened with a bolt or the like.

Therefore, in the rod-shaped conductor installation step, the rod-shaped conductor 1 in which the base end portion 1a and the upper element portion 1b, which is a portion other than the base end portion, are separate bodies is installed, and the base end portion 1a is supported by the support conductor 2. The base end portion 1a is fitted to the pointed head 1c provided at the end portion of the upper element portion 1b. Alternatively, in the rod-shaped conductor installation step, the rod-shaped conductor 1 in which the base end portion 1a and the upper element portion 1b which is a portion other than the base end portion 1a are separate bodies is installed, and the end portion of the upper element portion 1b is installed. The base end portion 1a is fitted to the pointed head 1c provided in the above. Further, in the rod-shaped conductor installation step, the pointed head 1c is inserted into the hole formed in the end portion of the base end portion 1a and fitted. The hole formed at the end of the base end 1a is formed at the end of the base end 1a on the opening 2a side. The pointed head 1c projects toward the opening 2a and is formed on the lower end surface of the upper element portion 1b.

In the first embodiment, the support conductor 2 supports the base end portion 1a via the dielectric 5 in a state where the base end portion 1a of the rod-shaped conductor 1 is housed therein and is electrically insulated from the base end portion 1a. It is supposed to be. This is limited to the case where the base end portion 1a of the rod-shaped conductor 1 is inserted into the inside from the opening 2a and the base end portion 1a is supported via the dielectric 5 in a state of being electrically insulated from the base end portion 1a. do not have. For example, as shown in FIG. 7, a cylindrical support conductor 2 is formed from the top side along the outer circumference of the base end portion 1a of the rod-shaped conductor 1 (strictly speaking, the outer circumference of the dielectric 5 into which the base end portion 1a is inserted). Also includes those that are fitted with, or those that are surrounded by a cylindrical support conductor 2 along the outer circumference of the base end portion 1a of the rod-shaped conductor 1 (strictly speaking, the outer circumference of the dielectric 5 into which the base end portion 1a is inserted).

The method of assembling the feeding unit shown in FIG. 7 will be described in more detail. The flat plate portion 2b of the support conductor 2 is installed at the installation location of the feeding portion structure (antenna device) (FIG. 7A). It can be said that this is a support conductor installation process for installing the support conductor 2. Next, the dielectric 5 is installed on the flat plate portion 2b. Although not shown, the dielectric 5 installed on the flat plate portion 2b may be one after supporting the rod-shaped conductor 1 (FIG. 7 (b)). FIG. 7B shows after inserting the base end portion 1a of the rod-shaped conductor 1 into the dielectric 5 installed on the flat plate portion 2b. FIG. 7C shows after the tubular support conductor 2 is fitted along the outer periphery of the dielectric 5 into which the proximal end portion 1a is inserted, or after being surrounded by the tubular support conductor 2. .. Strictly speaking, FIG. 7C shows a state in which the cylindrical support conductor 2 and the flat plate portion 2b are fixed by bolts 13 after being fitted (after being enclosed).

In the method of assembling the feeding portion structure, the antenna device, and the feeding portion according to the first embodiment, the ground wire 4 may be electrically connected to the opening 2a instead of the flat plate portion 2b. The explanation in this case will be described with reference to FIGS. 8 and 9. In the antenna device shown in FIG. 8, the high frequency voltage source 3, the feeding line 3a and the feeding line 3b are not shown, but the high frequency voltage source 3, the feeding line 3a and the feeding line 3b have the same configuration as shown in FIG. It is the same. 9 (a) is an enlarged perspective view of the periphery of the feeding portion structure, and FIG. 9 (b) is a cross-sectional view showing a state in which the inside of the box-shaped support conductor 2 in FIG. 9 (a) can be seen. In FIG. 9B, it can be seen that the flat plate portion 2b is fixed to the support conductor 2 by the two bolts 13.

In FIG. 9, the flat plate portion 2b is formed on the side opposite to the opening 2a of the support conductor 2, but it is not an essential configuration. Further, as described above, the flat plate portion 2b may be a part of the configuration of the support conductor 2. Further, in FIGS. 8 and 9 (a), the shape of the flat surface portion 2b is drawn as a square, but the shape is not limited to the square. Similarly, the ground wire 4 is a metal wire, but a protective film may be formed on the surface thereof.

The ground wire 4 of the antenna device is a metal wire provided with a terminal. In FIG. 9, it is connected to the opening 2a by an unmarked screw. The number of ground lines 4 is four, and it is preferable to lay them at approximately equal angles or in four directions at equal angles. It may be the ground line 4 of. When the ground line 4 is (n + 1), it is preferably laid at substantially the same angle or at the same angle in the n direction. Here, n is an integer of 1 or more.

In the feeding section structure shown in FIG. 10, the rod-shaped conductor 1 has a cylindrical shape (cylindrical shape) as a measure to avoid the natural resonance (described later) of the feeding section, but even if the capacitance c is reduced by changing the other shapes. good. For example, the shape of the support conductor 2 (metal box 2) may be changed from a simple box shape (box shape) to a divergent tapered shape instead of the rod-shaped conductor 1. Further, the shapes of both the rod-shaped conductor 1 and the support conductor 2 (metal box 2) may be changed.

Here, the natural resonance in the feeding unit will be described. A capacitance c is generated between the support conductor 2 (metal box 2) and the rod-shaped conductor 1. The size of the capacitance c is determined by the distance between the support conductor 2 (metal box 2) and the rod-shaped conductor 1, the facing area, and the relative permittivity of the dielectric 5. Inductance L is generated in the connecting lines (feeding line 3a, feeding line 3b) from the high frequency voltage source 3 due to the length of the line. Due to the capacitance c and the inductance L, natural resonance may occur only in the structure of the feeding portion. The resonance frequency f is given by the following equation. f = 1 / (2π√LC)

Generally, in the short wave band or the like, the natural resonance of the feeding unit occurs at a frequency higher than the frequency band used, so that there is no problem, but depending on the conditions of the feeding unit, resonance may occur in or near the frequency band used. At the natural resonance frequency, the impedance of the feeding unit becomes large and may become infinite. In this case, even if a matching circuit is added, impedance matching with the antenna device cannot be expected.

When the natural resonance of the feeding part occurs, in order to avoid the natural resonance, the distance between the support conductor 2 (metal box 2) and the rod-shaped conductor 1 and the facing area, the relative permittivity of the dielectric 5, and the high frequency voltage source 3 The length of the connecting line (feeding line 3a, feeding line 3b) is adjusted as a parameter. However, if the natural resonance of the feeding portion affects even after these adjustments, it is also effective to make the rod-shaped conductor 1 into a cylindrical shape (cylindrical shape) as shown in FIG. As a result, the facing area can be reduced on the lower end surface of the rod-shaped conductor 1, so that the effect of shifting the natural resonance of the feeding portion to a higher frequency can be obtained. In addition, there is an advantage of weight reduction as a secondary effect.

In the feeding portion structure (antenna device) according to the first embodiment, it has been described that the upper element portion 1b may be cylindrical, but as shown in FIG. 10, the entire rod-shaped conductor 1 may be tubular. In FIG. 10, the tubular portion inside the rod-shaped conductor 1 is shown by a broken line. Of course, when the base end portion 1a and the upper element portion 1b are separate bodies, the base end portion 1a may be cylindrical. Of course, a cylindrical rod-shaped conductor in which the base end portion 1a and the upper element portion 1b are fitted (connected) and communicated with each other may be used.

So far, as the method of assembling the feeding portion structure, the antenna device, and the feeding portion according to the first embodiment, the rod-shaped conductor 1 and the support conductor 2 have been described by using those having a circular cross section. And the support conductor 2 may have a polygonal cross section. Of course, a part of the cross section of the rod-shaped conductor 1 and the support conductor 2 may be circular, and a part of the cross section may be polygonal. In the feeding portion structure according to the first embodiment illustrated in FIG. 11, the cross section of the upper element portion 1b of the rod-shaped conductor 1 is circular, and the cross section of the base end portion 1a is quadrangular. The cross section of the support conductor 2 is a quadrangle both inside and outside.

The difference between FIGS. 11 and 1 to 10 is that the cross-sectional shape of the horizontal plane of the lower portion (base end portion 1a) of the rod-shaped conductor 1 and the support conductor 2 (metal box 2) is polygonal (quadrilateral). The cross-sectional shapes of the lower part (base end portion 1a) of the rod-shaped conductor 1 and the support conductor 2 (metal box 2) shown in FIGS. 1 to 10 were circular. In this case, if a rotational force in the horizontal plane is applied, it may hinder the mutual fixing of the rod-shaped conductor 1, the dielectric 5, and the support conductor 2 (metal box 2) by the adhesive, which is not shown. The same applies to sealing. By making the shape polygonal as shown in FIG. 11, the resistance to the rotational force in the horizontal plane is enhanced, and it is possible to contribute to the maintenance of quality. Since the support conductor 2 (metal box 2) can be processed by bending the sheet metal, there is also an effect of cost reduction.

It can be said that the rod-shaped conductor 1 shown in FIG. 11 has a diameter larger than that of the proximal end portion 1a except for the proximal end portion 1a and the proximal end portion 1a. In FIG. 11, the horizontal cross-sectional shape of the lower portion (base end portion 1a) of the rod-shaped conductor 1 and the support conductor 2 (metal box 2) is a square, but the same effect can be obtained with other polygons. Further, in FIG. 11, the shape of the lower portion (base end portion 1a and lower portion of the upper element portion 1b) of the rod-shaped conductor 1 is different between the inside and the outside of the support conductor 2 (metal box 2), but they are the same. May be good.

Embodiment 2.
Hereinafter, a method of assembling the feeding unit structure, the antenna device, and the feeding unit according to the second embodiment of the present invention will be described with reference to FIGS. 12 and 13. In the figure, the same or equivalent configurations may be designated by the same reference numerals and description thereof may be omitted. The configuration of the present invention described in the embodiment is an example thereof, and the present invention is not limited to the one shown in the embodiment. Combination with other embodiments is also possible.

In FIGS. 12 and 13, the rod-shaped conductor 1 has a larger internal diameter than the opening 2a. In the support conductor 2, the opening 2a and the portion other than the opening 2a are separate bodies, and the opening 2a is a metal lid 14 (annular portion 14) which is an annular (ring-shaped) member. This is because the method of assembling the feeding portion according to the second embodiment is a metal lid 14 (annular portion 14) in which an opening having a diameter smaller than the diameter of the opening 2a is formed in the opening 2a after the rod-shaped conductor installation step. It can be said that there is a process of reducing the diameter to attach). It may be said that the metal lid 14 (annular portion 14), which is an annular member, is the opening 2a itself. In this case, after the rod-shaped conductor installation step, a metal lid 14 (annular portion 14) having an opening having a diameter smaller than the diameter of the opening 2a is attached to the opening 2a to reduce the diameter of the opening 2a. It can be said that there is a process.

The difference between the feeding portion structure shown in FIG. 12A and the feeding portion structure according to the first embodiment is that the opening 2a on the top side of the support conductor 2 (metal box 2) is not short-circuited with the rod-shaped conductor 1. Is provided with a support conductor 2 (metal box 2) and a fixed metal lid 14. The shape of the lower part of the rod-shaped conductor 1 is such that the inside of the support conductor 2 (metal box 2) is large and the outside is small. The high frequency voltage source 3 is connected to the rod-shaped conductor 1 and the metal lid 14, respectively. 12 (b) and 13 are modified examples. FIG. 12 (b) shows the connection position of the ground line 4 changed from the flat surface portion 2b to the metal lid 14, and FIG. 13 shows no flat plate portion 2b. It is a thing. In other words, it can be said that the shape is such that the flat surface portion 2b is removed from the support conductor 2.

In the feeding portion structure (antenna device) according to the second embodiment, the lower portion of the rod-shaped conductor 1 is suppressed downward due to the provision of the metal lid 14 and the shape of the lower portion of the rod-shaped conductor 1, so that the pulling force of the rod-shaped conductor 1 is pulled out. Increases resistance to. Since almost all of the feeding portion 1 is covered with metal, the strength of the feeding portion 1 is also increased, which in turn contributes to an increase in the strength of the entire feeding portion structure (antenna device). Further, since the portion exposed to the outside of the dielectric 5 is minimized by the metal lid 14 (reducing the diameter step), the sealing range is also minimized, which also contributes to the improvement of environmental resistance. The metal lid 14 is fixed by the bolt 15 from the upper side, and the screw hole for the bolt 15 is provided in the wall thickness of the support conductor 2 (metal box 2). Therefore, the bolt 15 is the inner surface of the support conductor 2 (metal box 2). Does not protrude to. The fixation is strong but does not disturb the electric field. Since there is no insulator, there is little risk of deterioration of antenna performance due to leakage electric field.

FIG. 12B is a modification, in which the connection point of the ground wire 4 is changed from the flat plate portion 2b to the metal lid 14. The metal lid 14 makes it easy to raise the connection position of the ground wire 4. When the position of the ground line 4 is raised, there is an advantage that it is less likely to be affected by changes in the conditions of the ground and water pools. The same applies to the antenna device and the feeding unit structure shown in FIGS. 8 and 9 described in the first embodiment. If the metal lid 14 is provided, a large area for fixing the ground wire 4 can be taken. FIG. 13 is a modification, which is similar to the flat plate portion 2b removed from the component. Since the ground wire 4 is connected to the metal lid 14, when it is not necessary to fix the flat plate portion 2b to the ground, the flat plate portion 2b may be unnecessary in order to improve operability by reducing the weight.

In the feeding portion structure (antenna device) according to the second embodiment, the annular portion 14 (metal lid 14) may be integrated with the support conductor 2. In the case of such an integral case, the annular portion 14 (metal lid 14) may be referred to as an annular portion 2d (metal lid 2d). When the diameter of the annular portion 14 (annular portion 2d) is smaller than the diameter of the base end portion 1a of the rod-shaped conductor 1 as shown in FIGS. 12 and 13, the feeding portion is assembled as shown in FIG. You just have to choose the method. That is, using the support conductor 2 (integrated with the annular portion 14) having the end opposite to the opening 2a open, the outer periphery (strictly speaking, the proximal end portion) of the base end portion 1a of the rod-shaped conductor 1 from the top side. A cylindrical support conductor 2 is fitted along the outer circumference of the dielectric 5 into which 1a is inserted, or the outer periphery of the base end portion 1a of the rod-shaped conductor 1 (strictly speaking, the dielectric material into which the base end portion 1a is inserted). Surrounded by a tubular support conductor 2 along the outer circumference of 5). The opening at the end opposite to the opening 2a is covered with the flat plate portion 2b, and the support conductor 2 and the flat plate portion 2b are fastened by the bolt 13. The annular portion 14 (metal lid 14) is not limited to the annular member 14, but may be a member 14 that serves as a window that communicates with the inside and the outside of the support conductor 2. Further, it can be said that the opening 2a and the portion other than the opening 2a are separate bodies, and the opening 2a is a member 14 that serves as a window communicating with the inside and the outside of the support conductor 2.

Embodiment 3.
Hereinafter, a method of assembling the feeding unit structure, the antenna device, and the feeding unit according to the third embodiment of the present invention will be described with reference to FIG. In the figure, the same or equivalent configurations may be designated by the same reference numerals and description thereof may be omitted. The configuration of the present invention described in the embodiment is an example thereof, and the present invention is not limited to the one shown in the embodiment. Combination with other embodiments is also possible.

In the antenna device shown in FIG. 14, the high frequency voltage source 3, the feeding line 3a and the feeding line 3b are not shown, but the high frequency voltage source 3, the feeding line 3a and the feeding line 3b are the same as those in FIGS. 1 and 3. It is a composition. In FIG. 14, the cone-shaped element portion 16 (metal wire 16) is a cone-shaped antenna element, and may be applied to a dipole antenna although not shown. The antenna device (feeding portion structure) according to the third embodiment is different from the antenna structure shown in FIGS. 1 and 8, and as shown in FIG. 14, metal wires 16 are connected to the upper part and the lower part of the rod-shaped conductor 1. It is a thing. The antenna device according to the present application may have a cone-shaped antenna element.

In the antenna device according to the third embodiment, in addition to the rod-shaped conductor 1, the cone-shaped element portion 16 (metal wire 16) also functions as the first antenna element, so that the antenna area of the rod-shaped conductor 1 can be expanded. Further, one end of the cone-shaped element portion 16 (metal wire 16) is connected to the tip portion of the rod-shaped conductor 1, and the other end of the cone-shaped element portion 16 (metal wire 16) is near the feeding portion (feeding line in the rod-shaped conductor 1). By connecting to (near where 3a is connected), a wide band antenna characteristic can be obtained.

Embodiment 4.
Hereinafter, a method of assembling the feeding unit structure, the antenna device, and the feeding unit according to the fourth embodiment of the present invention will be described with reference to FIGS. 15 and 16. In the figure, the same or equivalent configurations may be designated by the same reference numerals and description thereof may be omitted. The configuration of the present invention described in the embodiment is an example thereof, and the present invention is not limited to the one shown in the embodiment. Combination with other embodiments is also possible.

In the antenna device shown in FIG. 16, the high frequency voltage source 3, the feeding line 3a and the feeding line 3b are not shown, but the high frequency voltage source 3, the feeding line 3a and the feeding line 3b have the same configuration as shown in FIG. It is the same. In FIGS. 15 and 16, the support conductor 2 has a rod-shaped lower element portion 2e on the side opposite to the opening 2a. In FIGS. 15 and 16, the flat plate portion 2b may or may not be present between the lower element portion 2e and the support conductor 2. The support conductor 2 may be included including the lower element portion 2e.

The antenna device (feeding section structure) according to the fourth embodiment is an example in which the antenna device (feeding section structure) according to the present application is applied to a dipole antenna instead of the conventional monopole antenna. The lower element portion 2e corresponds to a shape changed from the shape of the flat plate portion 2b in the first embodiment to the third embodiment or the shape opposite to the opening portion 2a of the support conductor 2. The total length of the dipole antenna is generally approximately half the wavelength of the target frequency, and in FIGS. 15 and 16, the length from the upper end of the rod-shaped conductor 1 (upper element portion 2b) to the lower end of the lower element portion 2e corresponds to. .. That is, in the antenna device according to the fourth embodiment, in addition to the support conductor 2, the lower element portion 2e also functions as the second antenna element.

Embodiments 1 to 4 include a feeding portion structure according to a first to fourth embodiments, a first antenna element having a rod-shaped conductor 1, and a second antenna element having a support conductor 2. It can be said that it is an antenna device according to 4. Further, the first antenna element includes not only the rod-shaped conductor 1 but also a conductor (metal wire 16, etc.) electrically connected to the rod-shaped conductor 1. Similarly, the second antenna element includes not only the support conductor 2 but also a conductor electrically connected to the support conductor 2 (ground wire 4, lower element portion 2e, etc.).

The method for assembling the feeding portion structure, the antenna device, and the feeding portion according to the first to fourth embodiments has a structure in which the rod-shaped conductor 1 can be divided outside the support conductor 2, or is assembled. A part or all of the rod-shaped conductor 1 may be cylindrical. The cross-sectional shape of one or both of the support conductor 2 and the rod-shaped conductor 1 may be polygonal. The shape of the rod-shaped conductor 1 may be different between the inside and the outside of the support conductor 2. A metal lid 14 fixed so as not to be short-circuited with the rod-shaped conductor 1 may be provided on the side not shielded by the conductor plate, that is, the end portion on the opening 2a side.

As described above, the methods for assembling the feeding unit structure, the antenna device, and the feeding unit according to the first to fourth embodiments are excellent in environmental resistance, high strength, high design quality, and low cost. Can be provided. Further, a part of the rod-shaped conductor 1 is covered with the dielectric 5, and most of the dielectric 5 is covered with the support conductor 2 (metal box 2), which has the disadvantages of the dielectric 5 having low environmental resistance and strength. It is characterized by being supplemented with a metal exoskeleton. Therefore, it is suitable for an antenna device of a wireless device such as a short wave band, which has a large size and is mainly used outdoors. In other words, it has excellent environmental resistance, high strength, high design quality, and low cost, and it can be said that it has a high affinity for antennas of low frequency radio devices such as short wave bands.

1 Rod-shaped conductor (main mast), 1a base end,
1b Upper element part (element part), 1c pointed head,
2 Support conductor (metal box, metal cylinder), 2a opening, 2b flat plate,
2d annular part (annular member, annular member), 2e lower element part (element part),
3 High frequency voltage source, 3a feeding line (signal line), 3b feeding line (ground line),
4 Ground wire, 5 Dielectric, 6 Rod-shaped conductor, 7 Flange (base end), 8 Base,
9 Dielectric, 10 Bolt, 11 Insulator (Insulator), 12 Nut,
13 volts, 14 annulus (metal lid), 15 volts,
16 Cone-shaped element part (element part, metal wire).

Claims (29)

A rod-shaped conductor and a box-shaped conductor having an opening, the base end portion of the rod-shaped conductor is housed inside, and a support that supports the base end portion in a state of being electrically insulated from the base end portion. A feeding section structure comprising a conductor and a feeding line in which one line is electrically connected to the rod-shaped conductor and the other line is electrically connected to the supporting conductor. The power feeding unit structure according to claim 1, wherein the support conductor is electrically connected to a linear ground wire. The feeding portion structure according to claim 2, wherein the ground wire is electrically connected to the side opposite to the opening of the supporting conductor. The feeding portion structure according to claim 3, wherein the ground wire is electrically connected to a flat plate portion formed on the opposite side of the opening of the supporting conductor. The feeding portion structure according to claim 2, wherein the ground wire is electrically connected to the opening of the support conductor. The feeding portion structure according to claim 1, wherein the supporting conductor has a rod-shaped lower element portion on the side opposite to the opening. The feeding portion structure according to claim 5 or 6, wherein the supporting conductor has a flat plate portion formed on the opposite side to the opening. The feeding portion structure according to claim 4 or 7, wherein the supporting conductor is formed into a box shape by covering a tubular conductor with the flat plate portion. The feeding portion structure according to any one of claims 1 to 8, wherein the supporting conductor has a dielectric formed between the supporting conductor and the base end portion. The power feeding unit according to any one of claims 1 to 9, wherein the rod-shaped conductor is a separate body of the base end portion and the upper element portion which is a portion other than the base end portion. Construction. The base end portion has at least a cusp protruding from the opening, and the cusp is fitted with the upper element portion to form the rod-shaped conductor. 10. The power feeding unit structure according to 10. The feeding portion structure according to claim 11, wherein the upper element portion is fitted with the pointed head inserted into a hole formed at an end portion on the side of the support conductor. The power supply according to claim 10, wherein the upper element portion has a pointed head at an end portion, and the pointed head is fitted with the base end portion to form the rod-shaped conductor. Part structure. The feeding portion structure according to claim 13, wherein the base end portion is fitted with the pointed head inserted into a hole formed in the end portion on the side of the opening portion. The power supply according to any one of claims 1 to 14, wherein the rod-shaped conductor has a larger diameter at the base end portion and a portion other than the base end portion. Part structure. The feeding portion structure according to any one of claims 1 to 14, wherein the support conductor has a larger internal diameter than the opening. 13. The power supply structure described. The support conductor has a dielectric inside, and the dielectric is arranged around the base end portion to insulate the rod-shaped conductor and the support conductor. The power feeding unit structure according to any one of claims 17. An antenna device including the feeding portion structure according to any one of claims 1 to 18, a first antenna element having the rod-shaped conductor, and a second antenna element having the support conductor. A rod-shaped conductor installation step in which the base end portion of a rod-shaped conductor is housed inside a support conductor which is a box-shaped conductor having an opening and is electrically insulated from the base end portion to support the base end portion. A method for assembling a power feeding unit, which comprises a feeding unit forming step of electrically connecting one line to the rod-shaped conductor and electrically connecting the other line to the support conductor. The method for assembling a feeding portion according to claim 20, wherein the rod-shaped conductor installation step comprises inserting a base end portion of the rod-shaped conductor into the inside from the opening. The method for assembling a power feeding unit according to claim 20, wherein the support conductor installation step for installing the support conductor is provided before the rod-shaped conductor installation step. The rod-shaped conductor installation step is to install the rod-shaped conductor in which the base end portion and the upper element portion other than the base end portion are separate bodies, and the base end portion is used as the support conductor. The power feeding unit according to any one of claims 20 to 22, wherein the upper element portion is fitted to a pointed head provided at the end portion of the base end portion after being supported. Assembling method. In the rod-shaped conductor installation step, the rod-shaped conductor is installed in which the base end portion and the upper element portion other than the base end portion are separate bodies, and the rod-shaped conductor is provided at the end portion of the base end portion. The power feeding unit according to any one of claims 20 to 22, wherein the base end portion is supported by the support conductor after being fitted to the pointed head portion with the upper element portion. Assembling method. 13. The method of assembling the power supply unit described. The rod-shaped conductor installation step is to install the rod-shaped conductor in which the base end portion and the upper element portion other than the base end portion are separate bodies, and the base end portion is used as the support conductor. The power feeding unit according to any one of claims 20 to 22, characterized in that the base end portion is fitted to a pointed head provided at the end portion of the upper element portion after being supported. Assembling method. In the rod-shaped conductor installation step, the rod-shaped conductor is installed in which the base end portion and the upper element portion other than the base end portion are separate bodies, and the rod-shaped conductor is provided at the end portion of the upper element portion. The method for assembling a power feeding unit according to any one of claims 20 to 22, wherein the proximal end portion is fitted to the sharpened head. 13. The method of assembling the power supply unit described. After the rod-shaped conductor installation step, a step of reducing the diameter is provided in which a member serving as a window communicating with the inside and the outside of the support conductor having an opening having a diameter smaller than the diameter of the opening is attached to the opening. The method for assembling a power feeding unit according to any one of claims 20 to 28.

Images