JP4842779B2 - Antenna radiator - Google Patents

Description

The present invention relates to an antenna mainly used for television reception, and more particularly to a configuration of a radiator suitable for a UHF antenna that receives television radio waves in the UHF band.

Digital terrestrial broadcasting, which has been spreading in recent years, can receive beautiful images due to its superior characteristics if it can receive radio waves above a certain level. In addition to the existing Yagi / Uta type antennas, a variety of antennas that can be easily installed on the veranda or indoors and that are compact, lightweight, and have excellent design are now required. . However, it is better to use a high-performance antenna such as the Yagi / Uta type antenna in consideration of signal distribution for antennas used for joint reception even for terrestrial digital broadcast reception.
As such a conventional Yagi-Uta type antenna, the antenna support frame is directed to the antenna as the antenna element, and the reflection is located at an appropriate distance in the axial direction of the boom, and is directed to the direction perpendicular to the axial direction. The antenna support rod having a plurality of through-holes penetrates the waveguide and reflection antenna elements formed by pipe-shaped small diameter and light metal having a linear shape in each of the plurality of through-holes. Thus, there is an antenna in which these antenna elements are fixed to the antenna support rod, respectively. In order to further improve the characteristics, the first radiator element and the second radiator element are provided, and a radiator having an inductance element in the arrangement direction of each radiator element is provided. An antenna having a good antenna has been proposed. (For example, see Patent Document 1)

JP 56-43902 A

However, as shown in Patent Document 1, in a radiator element in which a small-diameter and light metal having a linear shape is formed in a pipe shape, the physical dimensions of the element, that is, the element is thin. Among the characteristics, there is a problem that the band of the use frequency band cannot be made wide, and there is a limit to provide an antenna having excellent characteristics under the condition that it is small.
In addition, in such an antenna using an elongated metal pipe as usual, the end of each element is sharp and handling when assembling the antenna or mounting the antenna is inconvenient and dangerous. There is a problem that it is unsuitable for providing an antenna for enjoying digital terrestrial broadcasting by simply and safely installing it on a veranda or indoor, such as a broadcasting antenna. In addition, with such an antenna, there is a problem that the elements are turned up when birds such as crows stop at each element. Therefore, the present invention has been made to solve these problems,
The purpose is to propose an antenna with good characteristics over a wide band.
Another object is to provide a small but high-performance antenna.
Another object is to provide an antenna that is easy to assemble with a simple configuration.
Another object is to provide an antenna having excellent durability.

The invention of claim 1 made to solve the above-mentioned problems is as follows:
In an antenna radiator comprising a housing having a space in which circuit elements can be housed and a radiating element held so that at least a base portion is housed in the housing,
The radiating element is composed of a loop antenna formed so that the original parts located on both ends thereof are arranged opposite to each other and the axis of the original part is substantially on the same axis,
In the housing , on both side walls facing each other, there are insertions that have shapes corresponding to the outer shape of the loop antenna when viewed from the axial direction, and the base portions are freely inserted. The mouths are arranged so as to face each other so that the axis of each insertion port is substantially on the same axis.
Moreover, the interval at which the insertion holes are arranged is wider than the interval between the base portions of the loop antenna ,
When the casing is inserted into one side of the loop antenna from one insertion opening into the casing, the one base is inserted to the vicinity of the side wall of the casing where the other insertion opening is formed . An antenna radiator, wherein the other base portion of the loop antenna can be inserted into the housing from the outside of the other insertion port.

The invention of claim 2 is the antenna radiator according to claim 1,
When the loop antenna base portion is inserted, the insertion portion is arranged in a state where the axis of the base portion and the axis of the insertion port are substantially aligned to face each other, and the base portion is inserted in a substantially axial direction of the insertion port. After insertion of the base portion of the loop antenna, the axis of the base portion and the axis of the insertion port remain substantially on the same line, and the loop antenna is substantially orthogonal to the axial direction of the insertion port. It was configured to be formed to be supportable in the direction.

The invention of claim 3 is the antenna radiator according to claim 1 or 2, wherein
The loop antenna is formed by folding a thin rod-shaped element material made of a metal material, and when the loop antenna is arranged in a vertical direction, the base portion is horizontal to the axis of the base portion. The element material is formed so that a dimension substantially perpendicular to the direction is wider than the element material, and a dimension substantially perpendicular to the direction perpendicular to the axis of the base is sufficiently shorter than the element material. A plate-like fastening piece is integrally formed with the fastening piece, and the fastening piece is provided with fastening means for attaching the loop antenna to the housing.

The invention of claim 4 is the antenna radiator according to claim 3,
When inserting the base portion of the loop antenna, the insertion port is substantially aligned with the axis of the base portion and the axis of the insertion port in a state where the loop antenna is inclined by a predetermined amount so as not to face the vertical direction. The base portion is formed so as to be freely inserted in the axial direction of the insertion port, and when the loop antenna is suspended after the base portion of the loop antenna is inserted, The base part was configured so as not to be removable from the insertion port.

The invention of claim 5 is the antenna radiator according to any one of claims 2 to 4,
The loop antenna is inserted into and supported by the insertion port and is suspended, and the housing is attached to the fastening means provided at the base portion with a fastening tool at substantially the center inside the space of the housing. It was comprised so that it might adhere to.

The invention of claim 5 is an antenna,
It comprises so that the radiator of the antenna as described in any one of Claims 1-5 may be provided.

According to the antenna radiator of the first aspect, the radiating element is formed so that the original portions located at both ends thereof are arranged opposite to each other so that the axes of the original portions are substantially on the same axis. Loop antenna. Further, in the housing , both side walls facing each other are provided with insertion holes for inserting the respective base portions at both ends of the loop antenna into the housing, and the intervals at which the insertion ports are disposed. Is wider than the distance between the base parts of the loop antenna.
Then, when the casing is inserted into one side of the loop antenna from one insertion port into the casing, and the one base portion is inserted to the vicinity of the side wall of the casing where the other insertion port is formed , Since the other part of the loop antenna can be inserted into the housing from the outside of the other insertion port, once the loop antenna is attached to the housing, the loop antenna can be easily removed from the housing. Therefore, it is possible to provide a highly reliable antenna radiator having a strong mounting structure that cannot be removed.

According to a second aspect of the present invention, in the antenna radiator according to the first aspect, the insertion port substantially coincides with the axis of the original portion and the axis of the insertion port when the original portion of the loop antenna is inserted. In this state, the base portion can be inserted substantially in the axial direction of the insertion port, and after insertion of the loop antenna base portion, the axis of the base portion and the axis of the insertion port are substantially the same. Since the loop antenna is formed so that it can be supported in a direction substantially orthogonal to the axial direction of the insertion port while maintaining the line, even after one base portion is inserted into one insertion port, for example. In order to make it easier to insert the other base part into the other insertion port of the housing since the angle of the loop antenna can be arbitrarily tilted with respect to the axis of the insertion port formed in the housing In addition, the positioning of the loop antenna is easy Li, is that there is no compromised attachment of the loop antenna to the housing.

According to a third aspect of the present invention, in the antenna radiator according to the first or second aspect, the loop antenna is formed by folding a rod-shaped element material made of a metal material. When the antenna is arranged in the vertical direction, the original part is formed so that the dimension substantially perpendicular to the axis of the original part in the horizontal direction is wider than the element material. On the other hand, a plate-like fastening piece is formed integrally with the element material so that the dimension substantially perpendicular to the vertical direction is sufficiently shorter than the element material, and the loop antenna includes the loop antenna. The element material is integrally formed with a fastening piece having a fastening means by a processing means such as a press on the tip of the element material. As thin as possible May be those having a line width, the loop antenna can be lighter, and by extension, lightweight antenna can be realized.

According to a fourth aspect of the present invention, in the antenna radiator according to the third aspect, the insertion port has a predetermined amount so that the loop antenna does not face in the vertical direction when the base portion of the loop antenna is inserted. The base portion is formed so as to be freely inserted in the axial direction of the insertion port by making the axis of the base portion and the axis of the insertion port substantially coincide with each other in an inclined state. After the loop antenna is inserted, when the loop antenna is suspended, the base is configured so that it cannot be removed from the insertion port. Once the loop antenna is attached to the housing, the loop antenna is A more reliable antenna radiator having a strong mounting structure that cannot be easily removed from the housing can be provided.

According to a fifth aspect of the present invention, in the antenna radiator according to any one of the second to fourth aspects, the loop antenna is inserted and supported by the insertion port and hangs down. At the center of the body space, the fastening means provided at the base is fixed to the housing with a fastening device, so that the fastening is performed after the loop antenna is attached to the housing. As long as the fastening means provided on the piece is aligned with the mounting part formed in the central part of the casing, the loop antenna will naturally hang down without applying force, thereby fastening the fastening piece. And the mounting portion of the housing are arranged opposite to each other, so that the mounting to the mounting portion of the housing with a fastener can be easily performed.

According to the invention of claim 6, since the antenna is configured to include the antenna radiator according to any one of claims 1 to 5, a high-performance antenna having the above-described effect is provided. it can.

Hereinafter, an example of an embodiment embodying the present invention will be described in detail with reference to the drawings.
FIG. 1 is a schematic perspective view showing a configuration of a radiator of an antenna according to the present invention. 2A and 2B are explanatory views of a loop antenna constituting the radiator of the antenna of the present invention, wherein FIG. 2A is a top view and FIG. 2B is a front view. FIG. 3 shows a partially enlarged view of the base portion of the loop antenna and the shape of the insertion opening formed in the case main body corresponding to the base portion, and (a) to (c) show different embodiments. . 4 to 6 are explanatory views of a procedure for attaching the loop antenna to the case main body. FIG. 4A is a top view, and FIG. 6B is a partial sectional view as seen from the front. FIG. 7 shows a completed drawing of the radiator, where (a) is a top view and (b) is a partial sectional view as seen from the front. FIG. 8 shows different embodiments of the insertion opening provided in the case body. FIG. 9 is a schematic configuration diagram showing an antenna director according to the present invention. FIG. 9A is a top view, FIG. 9B is a front view, FIG. 9C is a rear view, and FIG. It is a right view. FIG. 10A is a perspective view of a reflector of an antenna according to the present invention, and FIG. 10B is an enlarged view of a principal part, showing a mounting structure of the reflector and the antenna support rod. FIG. 11 is a schematic configuration diagram showing an antenna according to the present invention, where (a) is a top view and (b) is a side view. (C) is a side view which shows the Example from which an antenna differs. 12 is a cross-sectional view taken along line AA in FIG. 11A, and FIG. 12B is a cross-sectional view taken along line BB in FIG. 11A (reflector omitted). 13 is a cross-sectional view taken along line CC in FIG. 11A, and FIG. 13B is a cross-sectional view taken along line DD in FIG. 13A (the reflector is partially broken). In the following description, when the direction and position are indicated, the arrow F in FIG. 1 is “front” unless otherwise specified, and the vertical direction (vertical direction) and the horizontal direction (horizontal direction) with respect to this direction line. ).

First, an antenna radiator according to the present invention will be described with reference to FIG. In FIG. 1, reference numeral 10 denotes a radiator according to the present invention. As shown in this figure, the radiator 10 includes the first radiator 11 and the second radiator 12 in the second radiator 12 in the front (in the direction of arrow F shown in the figure) and the first in the rear. The radiator 11 is configured to be spaced apart from each other in parallel. In the embodiment of the present invention, the radiator 10 is configured by folding a rod-shaped metal material, and the first radiator 11 is arranged in a horizontal direction on a plane substantially orthogonal to the arrangement direction of the radiators 10. An upper radiating element 11d having base portions 11g and 11g having connecting points 11a and 11a 'facing each other, which are long on both sides, and substantially parallel to the lower side of the upper radiating element 11d. A lower radiating element 11e, and side radiating elements 11b and 11c that connect both ends of the upper radiating element 11d and the lower radiating element 11e. In the embodiment of the present invention, the first radiating antenna 11d is formed in a rectangular shape such that the axis of the upper radiating element 11d is substantially on the same axis.
Similarly, the second radiator 12 is long on both sides in the horizontal direction on a plane substantially orthogonal to the arrangement direction of the radiators 10, and has a base portion 12g having connection points 12a and 12a 'facing each other inside. , 12g formed thereon, a lower radiating element 12e disposed substantially in parallel below the upper radiating element 12d, and side radiation connecting both ends of the upper radiating element 12d and the lower radiating element 12e. It is composed of elements 12b and 12c, the base part 12g is arranged so as to face each other, and its axis (that is, the axis of the upper radiating element 12d in the embodiment of the present invention) is rectangular so as to be substantially on the same axis. It is comprised from one 2nd loop antenna formed.

In addition, the first loop antenna 11 and the second loop antenna 12 are connected to the connection points 11a and 11a ′ of the base portions 11g and 11g of the first loop antenna 11 and the second loop antenna 12 opposite to each other in the arrangement direction of the loop antennas. Phase adjusting means 15 and 15 for phase adjustment are interposed between connecting points 12a and 12a 'facing the front and rear of the base portion 12g (that is, between 11a and 12a and between 11a' and 12a '). ing.
At least the base portions 11g and 11g of the first loop antenna 11 constituting the radiator 10, the base portions 12g and 12g of the second loop antenna 12, and the phase adjusting means 15 and 15 are made up of the case 5 (indicated by the one-dot chain line in FIG. The details are described later).
In the embodiment of the present invention, a loop antenna is used as a radiating element, and the shape of the loop antenna is rectangular. However, the shape is not particularly limited to this shape, and may be configured to have other shapes as necessary. May be.
In the embodiment of the present invention, the phase adjusting means 15 may be formed by etching a metal conductor provided on a printed wiring board to a predetermined length, or a metal plate or the like is formed by punching to a predetermined length. However, the formation method is not limited to the embodiment.

Next, the base portions 11g and 12g of the loop antenna will be described in detail with reference to FIGS. In the following description, the base portion 11g of the loop antenna 11 will be described for the sake of simplicity, and the base portion of the loop antenna 12 has the same configuration, and thus the description thereof will be omitted unless otherwise specified.
FIG. 2 shows a schematic configuration of the loop antenna 11 according to the present invention. In the embodiment of the present invention, the loop antenna 11 is formed by folding a thin metal rod as an element material as described above. The base 11g is formed at the tip of the upper radiating element 11d so that its axis is opposed to the substantially same axis. The partial enlarged view of the embodiment of the base portion 11g and the shape of the insertion port for inserting the base portion provided in the case for assembling the loop antenna to the case are shown in FIG. Example 1 shown in FIG. 3A is an enlarged view of the base portion 11g shown in FIG. The base part 11g shown in the embodiment of FIG. 3A is substantially orthogonal to the horizontal direction with respect to the axis of the base part 11g when the loop antenna 11 is arranged in the vertical direction as shown in the figure. The dimension to be formed is wider than the diameter of the element material 11d as the upper radiating element, and the dimension substantially perpendicular to the axis of the base portion 11g is sufficiently shorter than the element material 11d. A fastening piece 11f that is integrally formed by means such as a press is provided so as to have a plate shape, and the loop antenna 11 is attached to a fastening portion of a case described later on the fastening piece 11f. The connection point 11a is formed.
Further, in the embodiment of the base portion 11g shown in FIGS. 3B and 3C, the connection point 11a is formed at the tip of the element material 11d, but the fastening piece 11f is not formed. Show. In these examples, since the fastening piece 11f is not formed, the process of processing the loop antenna is simplified. However, the element material 11d needs to be wide enough to form the connection point 11a. ) Wider than the embodiment shown in FIG.
In the embodiment of the present invention, the connection point 11a is a through hole formed in the fastening piece 11f or the element material 11d. For example, a part of the fastening piece 11f is cut out instead of the through hole. It may be formed in a concave shape, and is not particularly limited to the embodiment. The connection point 11a is the fastening means described in the claims.

A procedure for attaching the loop antenna 11 configured in this manner to the case 5 will be described with reference to FIG. 3A and FIGS.
First, the case 5 for attaching the loop antenna 11 will be briefly described.
In the embodiment of the present invention, the case 5 is formed by molding a synthetic resin material using a mold or the like. The case main body 7 having an opening at the top and having a space 7a therein, and the opening of the case main body 7 The lid body 11 is configured to be closed (shown in FIGS. 7 and 12 described later). In the embodiment of the present invention, the loop antenna 11 is configured to be attached to the case body 7.
The case 5 is a case described in the claims.
The case body 7 has a shape corresponding to the outer shape of the loop antenna 11 when viewed from the axial direction on both side walls thereof, and the base portion 11g can be inserted. The insertion holes 71 and 72 are provided so as to face each other so that the axes of the insertion holes 71 and 72 are substantially on the same axis.
The shape of the insertion openings 71 and 72 in the embodiment of the present invention is shown in the right view of FIG. 3A (the insertion opening 72 is not shown in this figure), and the radiating element (ie, the insertion opening 72 is not shown). In addition to the hole 71a having an inner diameter slightly larger than the diameter of the upper radiating element 11d), a long hole 71b having a shape slightly larger than the fastening piece 11f of the base portion 11g and having a long side in the horizontal direction is provided for each of the holes 71a. It is formed in a superposed shape with the center points coincided with each other so that the axes of one base part 11g and the insertion opening 71 (or the base part 11g and the insertion opening 72) are substantially aligned with each other. The one base portion 11g can be inserted into the insertion port 71 (or the other base portion 11g is the insertion port 72). After the insertion, the upper radiating element 11d has substantially the same axis center with respect to the hole 71a. Supported to be on the line and freely rotatable It's are configured to be.
Further, the interval at which the insertion openings 71 and 72 are disposed is wider than the interval between the base portions 11g of the loop antenna 11, and the case body 7 has one base portion 11g inserted into one insertion portion. When inserted into the case body 7 from the opening 71 and one base portion 11g is inserted to the inside of the side wall of the housing where the other insertion port 72 is formed , the other base portion 11g is inserted into the other insertion port. The other base portion 11g is arranged in the vicinity of the outer side of 72 so that it can be inserted into the case body 7 from the outer side of the insertion opening 72.

Next, as shown in FIG. 4 for attaching the loop antenna 11, the case body 7 is positioned in the central space of the loop antenna 11, and the left base portion 11 g is inserted into the insertion opening 71 formed in the case body 7. The loop antenna 11 is disposed so as to be slightly tilted in the direction of the arrow R shown in the drawing so as to be in a position where it can be inserted, and the base portion 11g and the insertion port 71 are made to face each other.
Then, as shown in FIG. 5, the respective axial axes are substantially aligned, and then the loop antenna 11 is inserted in the direction of the arrow RR in the figure, and the inserted one base portion 11 g is in the vicinity of the other insertion opening 72. Push it to the position. At this time, since the loop antenna 11 has elasticity, the upper radiating element 11d and the like on the other base part 11g side overlap with the outer surface of the case body 7 and the like when the respective axis axes coincide with each other. Even if the loop antenna 11 is located at a certain position, the loop antenna 11 is slightly deformed according to the shape thereof, so that the case or the like does not interfere with the insertion of the base part. Returns to a predetermined shape. In the state where the inserted one original portion 11g is pushed to a position near the other insertion port 72, the other original portion 11g is positioned near the outside of the other insertion port 72.
In this state, as shown in FIG. 6, if the loop antenna 11 is pushed back in the direction of the arrow LL and the other base portion 11g is inserted into the case body 7 from the other insertion port 72, the loop The antenna 11 is attached to the case body 7. The loop antenna 11 attached in this way has the axis of the upper radiating element 11d and the axes of the hole 71a and the hole 72a approximately even if the base 11g has a fastening piece 11f wider than the radiating element. The loop antenna 11 can be rotatably supported in a direction substantially orthogonal to the axial direction of the insertion openings 71 and 72, so that when no force is applied to the loop antenna 11 from the outside, the loop antenna 11 has the case body 7 It will be in the state where it drooped with respect to. Further, since the loop antenna 11 is attached so as to hold the case body 7 by the base portions 11g on both sides, once the loop antenna 11 is attached to the case body 7, the loop antenna 11 is naturally separated from the case body 7. There is no falling off. If the lateral width of the fastening piece 11f and the lateral width of the long hole 71b (72b) are substantially the same size, and the insertion operation of the base portion 11g is performed by press-fitting or the like, The loop antenna 11g does not easily fall off even when vibrations are applied.

When the loop antenna 11 is attached to the case body 7, the base portion 11 g of the loop antenna 11 is disposed so as to be located at the approximate center of the case body 7 as shown in FIG. 6. A boss 14 projecting upward from the inner surface of the bottom of the space 7a and having a screw mounting hole 14a at the substantially central portion is formed at a substantially central portion of the space 7a formed inside the case body 7. In a state where 11 is suspended, the axis of the screw attachment hole 14a and the axis of the connection point 11a provided in the base portion 11g are arranged on substantially the same axis.
Here, the positional relationship between the protruding dimension of the boss 14 and the fastening piece 11f of the base portion 11g will be described with reference to FIGS. 5 to 7 and FIG. As shown in FIG. 5, in the state where the one base portion 11g of the loop antenna 11 is inserted, the protruding length of the boss is a length where the tip portion is substantially in contact with the outer peripheral surface of the upper radiating element 11d. Further, as shown in FIG. 6, the dimension between the upper end surface of the boss 14 and the lower surface of the fastening piece 11f is configured to be a predetermined interval t.
In the embodiment of the present invention, the predetermined dimension t between the upper end surface of the boss 14 and the lower surface of the fastening piece 11f is a print in which a transmission line as the phase adjusting means 15 is formed as shown in FIG. The printed circuit board 43 may be configured using, for example, a composite material such as FR4 having a thickness (= t) of 1 mm.

The printed wiring board 43 is formed with a fixing insertion hole (not shown in the figure) at a position facing the boss 14, so that the fixing insertion hole is used as a screw mounting hole 14a for the boss. The printed wiring board 43 is inserted between the fastening piece 11f and the boss 14 so as to oppose each other. Then, the screw 44 is formed on the loop antenna 11 and the printed circuit board 43 by screwing the screw 44 from above the base portion 11g into the screw attachment hole 14a through the connection point 11a and the fixing insertion hole formed in the printed circuit board 43. The phase adjusting means 15 is electrically connected, and the loop antenna 11 and the printed board 43 are firmly fixed to the case body 7. Since the loop antenna 12 has the same configuration, detailed description thereof is omitted.
In addition, 75 shown in FIG. 7 is a waterproof cap made of, for example, elastic rubber or synthetic resin material for closing the insertion holes 71 and 72, and is not shown in the drawing in the approximate center. A large-diameter hole having an inner diameter slightly smaller than the outer shape of the insertion opening, and a small-diameter hole having an inner diameter slightly smaller than the outer shape of the upper radiating element 11d connected to the large-diameter hole are provided at the tip of the hole. It is comprised so that it may have a through-hole. To attach the waterproof cap to the loop antenna, insert the upper radiating element into the small hole of the waterproof cap in advance before forming the fastening piece at the base of the upper radiating element. After mounting, a fastening piece is formed on the base of the upper radiating element using a mold or the like. To attach the waterproof cap to the case body, after the loop antenna is attached to the case body, the waterproof cap is slid as shown by an arrow 77 shown in FIG. It is done by moving and fixing. The waterproof cap is held in close contact with the outer periphery of the insertion opening of the case main body and the side wall where the insertion opening is formed due to its elastic force, and as a result, dust, rainwater, etc. are prevented from entering the case.

Next, another embodiment of the present invention will be described with reference to FIG. In this embodiment, the same loop antenna 11 as in the above embodiment is used, and the loop antenna 11 can be easily attached as described above, but once it is attached, the case main body 7 cannot be easily removed. Is.
The insertion openings 71 and 72 in this different embodiment are inserted into the insertion openings 71 or 72 with the loop antenna 11 slightly tilted forward or backward, as well shown in FIG. 8 (a). As possible, the attachment positions of the insertion openings 71 and 72 are formed such that the longitudinal axes of the long holes 71b and 72b constituting the insertion opening are inclined by θ in the drawing. That is, when the loop antenna 11 is attached to the case body 7, the loop antenna 11 is placed so that one element 11g of the loop antenna 11 and the insertion opening 71 (or the other element 11g and the insertion opening 72) face each other. After tilting by θ, mount in the same way as the above mounting procedure.
After the loop antenna 11 is attached, as well shown in FIG. 8B, the loop antenna 11 is supported so as to be rotatable in a direction substantially perpendicular to the axial direction of the insertion openings 71 and 72. When no force is applied to the loop antenna 11, the loop antenna 11 hangs down from the case main body 7. Therefore, unless a force is applied to the loop antenna 11 from the outside, the fastening piece 11f of the base portion 11g is in the horizontal direction. It is arranged to face. On the other hand, as described above, the long holes 71b of the insertion opening 71 and the long holes 72b of the 72 are provided in an inclined state by the angle θ, so that the axis of the base portion 11g of the loop antenna 11 and the case body 11 Although the base portion 11g and the insertion ports 71 and 72 are not arranged to face each other even if they are arranged on substantially the same axis as the axis of the insertion ports 71 and 72 formed in FIG. It is difficult to do easily.

The lengths and intervals of the first loop antenna 11 and the second loop antenna 12 are determined so that desired electrical characteristics can be obtained in the configuration of such a radiator. According to the present invention, the length of the first loop antenna 11 is substantially equal to the wavelength λ1 corresponding to the minimum frequency at the use frequency, and the length of the second loop antenna 12 corresponds to the center frequency at the use frequency. The length between the first loop antenna and the second loop antenna is approximately one-tenth of the wavelength λ2 corresponding to the center frequency at the used frequency.
Here, specific dimensions of the loop antenna of the radiator are shown in FIG. The first loop antenna 11 has a length W4 = 260 mm between the side radiating elements 11b-11c, and a length H4 = 45.5 mm between the side radiating elements 11b and 11c, and the second loop antenna 12 has a side radiating. The length W5 between the elements 12b-12c is 225 mm, the length H5 of the side radiation elements 12b and 12c is 45.5 mm, and the distance between the first loop antenna 11 and the second loop antenna 12 is 52 mm. The radiator 10 configured as described above is configured to have the maximum directivity in the arrangement direction of the first loop antenna 11 and the second loop antenna 12.
In the embodiment of the present invention, the first loop antenna 11 and the second loop antenna 12 are formed by bending a metal rod having a diameter of 3 mm to a predetermined length, but may be formed by a metal pipe. The conductive material may be press-worked, or a thin wire formed in a loop shape may be integrally formed with a resin, so long as it is a conductive material, the embodiment is not limited to the embodiment.

As described above, according to the radiator 10 of the antenna of the present invention, even if the element constituting the radiator 10 is a loop antenna formed so that the distance between the base part and the base part has a predetermined dimension, The loop antenna can be easily attached to the housing for storing the part without changing the shape of the loop antenna formed in advance, and once the loop antenna is attached to the housing, the loop antenna It is possible to provide an antenna radiator having a mounting structure that is easy to assemble and cannot be easily removed from the body, and that has a strong and reliable mounting structure even with a simple configuration.
In addition, since the loop antenna is configured to be held by the case so that the case can be held by using both base parts of the loop antenna, for example, it is assumed that birds such as crows have stopped on the loop antenna. However, compared to the conventional antenna where the radiator element is made of a pipe, the loop antenna is less likely to drop, the element does not break and fall, and the element has a strong mounting strength to the housing. Can provide a radiator.
According to the present invention, the loop antenna is formed so as to be rotatably supported in a direction substantially perpendicular to the axial direction of the insertion port, for example, one base portion is formed in one insertion port. Even after being inserted into the housing, the angle of the loop antenna can be arbitrarily tilted with respect to the axis of the insertion port formed in the housing, so that the other base is inserted into the other insertion port of the housing. In order to facilitate the positioning of the loop antenna, the antenna antenna can be positioned easily, and the mounting ability of the loop antenna to the housing is not impaired, and an antenna radiator with good assemblability can be provided.

Further, the loop antenna has a plate-like fastening piece wider than the element material formed integrally with the element material, and a fastening piece for attaching the loop antenna to the casing is attached to the fastening piece. Even if it is configured to have a means, it can be attached without impairing the attachment to the housing, so that the element material can be integrally formed with a fastening piece by a processing means such as a press on the tip portion thereof. It is sufficient if the line width is as narrow as possible, and the loop antenna can be reduced in weight, and thus the antenna can be reduced in weight.

In the radiator according to the present invention, the loop antenna may be used as a connection point provided at a base portion at a substantial center inside the space of the housing in a state where the loop antenna is inserted and supported by the insertion port and hangs down. Since the fixing means such as a screw is fixed to the housing with the fastening means, the fastening means provided on the fastening piece is attached to the central portion of the housing after the loop antenna is attached to the housing. As long as it is aligned with the formed mounting part, the loop antenna will naturally hang down without applying force, and the fastening means of the fastening piece and the mounting part of the housing will be placed opposite each other. The housing can be easily attached to the attachment portion.

In this way, when the mounting of the printed circuit board 43 provided with the loop antennas 11 and 12 and the phase adjusting means 15 to the housing is completed, the printed wiring board 43 is mounted as shown in FIG. A predetermined position and the antenna output terminal 40 are connected via a balance / unbalance conversion unit 45 or the like. The accommodating portion 18 accommodates the balance / unbalance conversion portion 45 and the like, and is a space for mounting the antenna output terminal 40. The accommodating portion 18 projects downward from a part of the bottom portion of the case body 7 and is secondly accommodated therein. It has a space 18a, and is configured to include an F-type coaxial connector seat 40 as an antenna output terminal for connecting the antenna and the outside to the bottom surface of the second storage space 18a. Incidentally, 19 shown in the figure is a draining skirt portion, and a cylindrical draining with its coaxial center aligned with the coaxial connecting seat 40 is provided on the lower surface of the accommodating portion 18 so as to project downward in a double manner. Yes.
Further, the accommodating portion 18 has a virtual plane (HH line in FIG. 12B) in which the tip of the antenna output terminal 40 passes through the central axis of the antenna support rod and is substantially parallel to the central axis. Therefore, when the lead-in wire is connected to the antenna output terminal 40, the antenna support rod 2 and the loop antennas 11 and 12 obstruct the connection easily. There is no loss of sex. As an example, as shown in FIG. 12B, the height of the antenna output terminal 40 is formed so that the tip of the antenna output terminal 40 is substantially on a virtual plane formed by the lower radiating elements 11e and 12e of the loop antenna in the arrangement direction. It only has to be done.
Further, since the accommodating portion 18 such as the balance / unbalance conversion portion 45 is provided on the side where the antenna support rod 2 is disposed (that is, downward) at a position that does not interfere with the mounting of the antenna support rod 2, the radiator The portion of the ten cases 5 protruding above the antenna support rod 2 can be reduced, and the antenna can be made thinner.
In the embodiment of the present invention, an example is shown in which the balance / unbalance conversion unit 45 and the like are housed in the housing unit 18, but not only the balance / unbalance conversion unit 45 and the like, but also the output signal of this UHF antenna, For example, a mixing circuit that mixes signals from an external antenna such as a satellite antenna and outputs it from one antenna output terminal 40 may be housed. In this case, an external antenna input terminal for an external antenna for connecting a lead-in wire from the external antenna may be provided on the lower surface of the housing portion 18.

Next, the director 3 will be described with reference to FIG. In FIG. 9, one waveguide is shown for the sake of simplicity of explanation, but in the antenna of the present invention, a plurality of waveguides are arranged at the front and back to form the waveguide 3. As shown in FIG. 9, the director 3 according to the embodiment of the present invention introduces third loop antennas 30 and 30 formed in a substantially rectangular shape having a horizontal length longer than a vertical height. The configuration is such that two are arranged in parallel, with the longitudinal axis of the third loop antenna 30 aligned in the horizontal direction, separated by a predetermined distance on a plane orthogonal to the arrangement direction of the wave filters 3. A plurality of the waveguides are arranged at a predetermined interval in the front-rear direction.
The third loop antenna 30 is arranged on a plane orthogonal to the direction in which the directors are arranged. The upper waveguide element 30d is long in the horizontal direction, and the lower waveguide element 30e is disposed substantially in parallel below the upper radiation element 30d. And the side waveguide elements 30b and 30c connecting both ends of the upper waveguide element 30d and the lower waveguide element 30e. In the embodiment of the present invention, the waveguide 3 is prepared in two types, 3A and 3B, in which the distance between the side waveguide elements 30b and 30b (hereinafter referred to as the width of the waveguide) W is different. Yes. The height H1 of the waveguide element is one type.

Here, specific dimensions of the third loop antenna 30 of the director are shown. In the embodiment of the present invention, the third loop antenna 30 has two widths w1 = 124 mm and w2 = 146 mm, respectively, and each of the waveguides has a side radiating element 30b having the same length H1 = 22 mm. (30c), and the third loop antennas 30 are arranged so as to be separated from each other by 60 mm to constitute a waveguide. Therefore, as shown in FIG. 11, the waveguide 3 has two types of waveguide widths W1 = 314 mm (waveguide 3A) and W2 = 358 mm (waveguide 3B).
In the embodiment of the present invention, the third loop antenna 30 is formed by bending a metal rod having a diameter of 3 mm to a predetermined length. However, the present invention is not limited to this embodiment, and is formed by a metal pipe. Alternatively, the conductive material may be press-processed, or a thin wire formed in a loop shape may be integrally formed with a resin, so long as it is a conductive material. In this embodiment, the third loop antenna 30 has a rectangular shape. However, the present invention is not limited to this embodiment, and the shape thereof may be changed as appropriate.

As shown in FIG. 9, the third loop antennas 30 and 30 are arranged such that the longitudinal axis of the third loop antenna is on the same line, and the width W of the director 3 is the predetermined length described above. Thus, the waveguide 3 is formed by holding the respective base portions 30g by the loop antenna support base 31. The loop antenna support base 31 is formed by molding a synthetic resin material or the like with a mold or the like, and the third loop antennas 30 and 30 are firmly attached to the loop antenna support base 31 by integral processing, and the loop antenna 30 is horizontal. The directors 3 are stacked in the direction.
An insertion hole 34 for inserting the antenna support rod 2 (not shown in the figure) for supporting and fixing the waveguide 3 is formed at a substantially central position of the loop antenna support base 31. Further, the entire circumference of the peripheral edge of the insertion hole 34 or at least the upper part in the figure is projected from the antenna support base 31 substantially parallel to the axial direction of the antenna support rod 2, and the antenna is formed at the center of the projected part. A protruding piece 32 having a through hole 33 having an axis in a direction orthogonal to the axis of the support rod 2 is formed.

Next, the reflector will be described with reference to FIG. FIG. 10A is a schematic perspective view of the reflector 20. In FIG. 10A, reference numeral 20 denotes a reflector, and in the embodiment of the present invention, the reflector 20 is formed by punching an aluminum plate material whose surface is anodized into a rectangle. 20a formed in the reflector 20 is a long hole formed by punching the reflector 20 designed to reduce the weight of the reflector 20 and reduce the wind receiving area.
Reference numeral 50 denotes an attachment angle for fixing the reflector 20 and the antenna support rod 2 by being interposed between the reflector 20 and the antenna support rod 2. The mounting angle 50 is a curved portion 51 so as to correspond to the outer peripheral surface of the antenna support rod 2 in at least a half of the circumferential direction of the antenna support rod 2 formed so as to protrude to the front side of the reflector 20 or in a narrower range. The antenna support rod mounting portion 52 having a predetermined length formed with the above-mentioned reflection, which is provided on the rear side of the antenna support rod mounting portion 52 so as to be substantially orthogonal to the projecting direction of the antenna support rod mounting portion 52. It is composed of a reflector mounting portion 57 for mounting on the container 20. The reflector mounting portion 57 and the reflector 20 are firmly fixed by mounting means such as screws 60 and nuts 61, for example.
Then, the front antenna support rod mounting portion 52 of the mounting angle 50 is abutted against the peripheral surface of the antenna support rod 2 from the circumferential direction of the antenna support rod 2 (above the antenna support rod in the figure) as a fastening means. The mounting angle 50 is attached to the antenna support rod 2 with a screw rod 53 and a nut 54.
Here, specific dimensions of the reflector 20 are shown. In the embodiment of the present invention, the plate thickness is 1.5 mm, and an aluminum material is formed with a width W6 = 295 mm and a height H6 = 100 mm.
It should be noted that the antenna support rod mounting portion 52 of the mounting angle 50 shown in the embodiment of the present invention abuts on the outer peripheral surface of the antenna support rod 2 at least in a half of the circumferential direction of the antenna support rod 2 or in a narrower range. However, the present invention is not limited to this embodiment, and the antenna support rod mounting portion 52 has a shape corresponding to the outer peripheral surface in a range wider than half of the circumferential direction of the antenna support rod 2. Thus, the antenna support rod 2 may be formed so as to embrace and be attached to be inserted into the end portion of the antenna support rod 2.

FIG. 11 shows a configuration example of an antenna including the radiator 10, the waveguide 3, and the reflector 20 configured as described above. In FIG. 11, reference numeral 1 denotes an antenna. In the embodiment of the present invention, an example in which a UHF antenna is configured is shown. As described above, the waveguide 3 is composed of two types of waveguides 3A and 3B having different widths W. The first waveguide 3A, the second waveguide 3A, Three waveguides of the third waveguide 3A are arranged at intervals shown by L1, respectively, and thereafter, a fourth waveguide 3A is arranged at an interval shown by L2, and further L3 The fifth director 3B is disposed at a distance indicated by
Then, behind the fifth waveguide 3B, radiation is performed such that the distance between the center point before and after the second loop antenna 12 and the first loop antenna 11 and the fifth waveguide 3B is L4. The reflector 10 is disposed behind the radiator 10, and a reflector 20 is disposed at a distance L5 to form a UHF antenna having a total of seven elements.
Here, the concrete dimension of the space | interval of each element is shown. In the embodiment according to the present invention, L1 = 100 mm, L2 = 105 mm, L3 = 115 mm, L3 = 75 mm, and L4 = 125 mm.
As shown in this figure, the width of the first, second, third and fourth waveguides 3A is indicated by W1, and the width of the fifth waveguide 3B is indicated by W2. . The height of these waveguides (side waveguide element 3b) is H1.
In the radiator 10, the width of the second loop antenna 12 is indicated by W5, the width of the first loop antenna 11 is indicated by W4, and the height thereof is indicated by H4 and H5.
The reflector 20 has a width W6 and is indicated by a height H6.
In the embodiment of the present invention, the height of the loop antenna is configured so that the director 3 is H1, but the height is not particularly limited to this embodiment. For example, the height of the loop antenna is adjacent to the waveguide. You may comprise so that the vertical height of the loop antenna located ahead with respect to the radio wave arrival direction of the loop antenna may be slightly smaller than the vertical height of the loop antenna located behind.

Here, a specific procedure for attaching the waveguide 3, the radiator 10, and the reflector 20 to the antenna support rod 2 will be described with reference to FIGS. 12, 13, and 10 (b). 12A is a cross-sectional view taken along the line AA shown in FIG. 11A, and FIG. 12B is a cross-sectional view taken along the line BB shown in FIG. 13A is a cross-sectional view taken along the line C-C shown in FIG. 11A, and FIG. 13B is a cross-sectional view taken along the line DD shown in FIG. In FIG. 12B, the reflector 20 is omitted for the sake of simplicity.
A procedure for attaching the director 3 (the fifth director 3B in the figure) to the antenna support rod 2 will be described. First, the antenna support rod 2 is inserted into the insertion hole 34 formed in the loop antenna support base 31 of the director 3. The antenna support rod 2 has an axis extending through the antenna support rod 2 at positions corresponding to L1, L2, and L3, which are the arrangement intervals of the first waveguide 3A to the fifth waveguide 3B described above. Since a through hole 23 for attaching a director is formed in a vertical direction perpendicular to the axis, the axis of the corresponding through hole 23 for attaching a director and the loop antenna support 31 are connected to the predetermined waveguide. The axial line of the through hole 33 formed in the projecting piece 32 is positioned so as to be substantially coincident, and, for example, the through hole 33 and the through hole 23 for attaching the waveguide are inserted from above the projecting piece 32. If the screw 21 is provided and the screw 21 is screwed into a nut 22 provided on the lower side of the antenna support rod 2 to hold the waveguide 3 and the antenna support rod 2 between them, the waveguide 3 is supported by the antenna. It is securely attached to the ridge 2 at a predetermined interval.
In the embodiment of the present invention, an example is shown in which the antenna support rod 2 supports the waveguide 3 so as to pass through the center point of the waveguide (that is, the insertion hole formed in the loop antenna support base). However, it is not particularly limited, for example, as shown in FIG. 4C, each element may be arranged on the upper side (or the lower side) of the antenna support rod 2.

Next, a procedure for attaching the radiator 10 to the antenna support rod 2 will be described. In addition to the through-hole 23 for attaching the director for attaching the director 3 to the antenna support rod 2, the waveguide is provided at a rear position separated by a predetermined distance L4 from the fifth director 3B. A through hole 24 for mounting the radiator 10 is formed through the antenna support rod 2 so as to be parallel to the through hole 23 for mounting. The antenna support rod 2 is inserted so as to penetrate the first and second loop antennas 11 and 12 provided in the radiator 10, and is formed at the bottom of the case body 7 that is the base of the case 5. The radiator mounting portion 8 is moved to a position facing the through hole 24 for mounting the radiator. When the radiator mounting portion 8 and the radiator mounting through hole 24 are substantially on the same axis, a screw 25 is inserted into the radiator mounting through hole 24 from below the antenna support rod 2.
Since a nut 9 having a female screw portion to be screwed to the screw 25 is provided at a substantially central portion of the case mounting portion 8, the radiator 10 can support the antenna by screwing the screw 25 to the nut 9. It can be securely attached to the flange 2. At the bottom of the case body 7 on which the case mounting portion 8 is formed, when the antenna support rod 2 is mounted on the radiator 10, a curved portion 17a is formed so as to come into contact with the upper outer periphery of the antenna support rod 2. Are formed on the front and rear sides of the case body 7 so as to be arranged in the axial direction of the antenna support rod 2 with the case mounting portion 8 interposed therebetween, and the radiator 10 is stable with respect to the antenna support rod 2. It is configured to be installed. This attachment state is shown in FIG.

Next, the assembly procedure of the reflector 20 will be described. In addition to the through hole 23 for attaching the director for attaching the director 3 and the through hole 24 for attaching the radiator 10, the antenna support rod 2 has a reflector so as to be substantially parallel to these through holes. A through hole 28 for attachment is formed through the rear end portion of the antenna support rod 2. A through hole 55 is formed in the antenna support rod mounting portion 52 of the mounting angle 50.
Then, the reflector 20 provided with the mounting angle 50 in advance is attached to the antenna support rod 2 from the circumferential direction of the antenna support rod 2 (above the antenna support rod 2 in the embodiment of the present invention). It is placed so as to contact the rear end of the heel 2. Next, the through hole 55 formed in the antenna support rod mounting portion 52 and the reflector mounting through hole 28 formed in the antenna support rod 2 are adjusted so as to face each other. When 55 and the through hole 28 of the antenna support rod 2 are substantially on the same axis, a screw 53 is inserted from above the antenna support rod mounting portion 52. The reflector 20 is securely fixed to the antenna support rod 2 by screwing into the nut 54 on the bottom surface side of the antenna support rod 2. Note that reference numeral 56 shown in FIG. 13 denotes a fastening piece, which is a deformation preventing metal fitting for preventing the antenna support rod 2 from being crushed by fastening of the screw 53 and the nut 54.

The antenna configured in this way can provide a high-performance and highly reliable antenna having the above-described effects. If the frequency band used for this antenna is adapted to the UHF band television signal, an excellent antenna suitable for receiving a terrestrial digital broadcast signal can be provided.

In addition, this invention is not limited to the said embodiment, It is also possible to change and implement the structure of each part suitably.

It is a schematic perspective view which shows the structure of the radiator of the antenna which concerns on this invention. It is explanatory drawing of the loop antenna which comprises the radiator of the antenna of this invention, (a) is a top view, (b) is a front view. The partial enlarged view of the base part of the loop antenna and the shape of the insertion opening formed in the case body corresponding to the base part are shown, and (a) to (c) show different embodiments. It is explanatory drawing of the attachment procedure of the loop antenna with respect to a case main body, respectively, (a) is a top view, (b) is the partial cross section seen from the front. It is explanatory drawing of the attachment procedure of the loop antenna with respect to a case main body, respectively, (a) is a top view, (b) is the partial cross section seen from the front. It is explanatory drawing of the attachment procedure of the loop antenna with respect to a case main body, respectively, (a) is a top view, (b) is the partial cross section seen from the front. The completed figure of a radiator is shown, (a) is a top view, (b) is the partial cross section seen from the front. It is an Example from which the insertion port with which a case main body is equipped differs. BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic block diagram which shows the waveguide of the antenna which concerns on this invention, (a) is a top view, (b) is a front view, (c) is a rear view, (d) is a right view. It is. (A) is a perspective view of the reflector of the antenna which concerns on this invention, (b) is the principal part enlarged view which fractured | ruptured a part which shows the attachment structure of a reflector and an antenna support rod. BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic block diagram which shows the antenna which concerns on this invention, (a) is a top view, (b) is a side view. (C) is a side view which shows the Example from which an antenna differs. It is the sectional view on the AA line in Fig.11 (a), (b) is the BB sectional drawing in Fig.11 (a) (The reflector was abbreviate | omitted). It is CC sectional view taken on the line in Fig.11 (a), (b) is DD sectional view taken on the line in Fig.13 (a) (the reflector partly fractured | ruptured).

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Antenna, 2 ... Antenna support rod, 3 (3A, 3B) ... Waveguide, 5 ... Case, 6 ... Cover body, 7 ... Case main body, 7a ... 1st accommodation space, 8 ... Case attaching part, 9 ... Nut, 10 ... radiator, 11 ... first loop antenna, 11a / 11a '... connection point, 11b / 11c ... side waveguide element, 11d ... upper waveguide element, 11e ... lower waveguide element, 11f ... fastening Piece, 11g ... base part, 12 ... second loop antenna, 12a · 12a '... connection point, 12b · 12c ... side waveguide element, 12d ... upper waveguide element, 12e ... lower waveguide element, 11f ... fastening Piece, 12g ... base part, 14 ... boss, 14a ... screw mounting hole, 15 ... phase adjusting means, 17 ... receiving piece, 17a ... curved part, 18 ... receiving part, 18a ... second storing space, 19 ... draining skirt part , 20 ... reflector, 21 ... screw, 22 ... nut, 23 ... director removal Attached through hole, 24... Radiator mounting through hole, 25. Screw, 28. Reflector mounting through hole, 30. Third loop antenna, 30 d. Upper waveguide element, 30 e. Lower waveguide element, 30 b. 30c ... side waveguide element, 30g ... base part, 31 ... loop antenna support, 32 ... projecting piece, 33 ... through hole, 34 ... insertion hole, 40 ... antenna output terminal, 41, 42 ... recess, 43 ... Printed wiring board, 44 ... screw, 45 ... balance / unbalance conversion means, 50 ... mounting angle, 51 ... curved, 52 ... antenna support hook mounting portion, 53 ... screw, 54 ... nut, 55 ... through hole, 56 ... fastening One piece, 57 ... reflector mounting portion, 60 ... screw, 61 ... nut, 71, 72 ... insertion port, 71a ... hole, 71b ... long hole, 75 ... waterproof cap.

Claims (6)

In an antenna radiator comprising a housing having a space in which circuit elements can be housed and a radiating element held so that at least a base portion is housed in the housing,
The radiating element is composed of a loop antenna formed so that the original parts located on both ends thereof are arranged opposite to each other and the axis of the original part is substantially on the same axis,
In the housing , on both side walls facing each other, there are insertions that have shapes corresponding to the outer shape of the loop antenna when viewed from the axial direction, and the base portions are freely inserted. The mouths are arranged so as to face each other so that the axis of each insertion port is substantially on the same axis.
Moreover, the interval at which the insertion holes are arranged is wider than the interval between the base portions of the loop antenna ,
When the casing is inserted into one side of the loop antenna from one insertion opening into the casing, the one base is inserted to the vicinity of the side wall of the casing where the other insertion opening is formed . An antenna radiator, wherein the other base portion of the loop antenna can be inserted into the housing from the outside of the other insertion port. The insertion port is
At the time of insertion of the original part of the loop antenna, the original part can be inserted in the substantially axial direction of the insertion opening in a state where the axis of the original part and the axis of the insertion opening are substantially aligned and opposed to each other.
After insertion of the base part of the loop antenna, the axis of the base part and the axis of the insertion port remain substantially on the same line, and the loop antenna can be supported in a direction substantially orthogonal to the axial direction of the insertion port. The antenna radiator according to claim 1, wherein the antenna radiator is formed as follows.
The loop antenna is formed by folding a thin rod-shaped element material made of a metal material, and when the loop antenna is arranged in a vertical direction, the base portion is horizontal to the axis of the base portion. The element material is formed so that a dimension substantially perpendicular to the direction is wider than the element material, and a dimension substantially perpendicular to the direction perpendicular to the axis of the base is sufficiently shorter than the element material. A plate-like fastening piece is integrally formed with the fastening piece, and the fastening piece is provided with fastening means for attaching the loop antenna to the housing. Item 3. The antenna radiator according to any one of Items 2 to 3.
The insertion port is
When inserting the base part of the loop antenna, the axis of the base part and the axis of the insertion port should be substantially opposite to each other with the axis tilted by a predetermined amount so that the loop antenna does not face in the vertical direction. The base portion is formed so as to be freely inserted in the axial direction of the insertion opening,
The antenna radiator according to claim 3, wherein, after the loop antenna is inserted, when the loop antenna is suspended, the base is configured not to be removable from the insertion port. .
The loop antenna is inserted into and supported by the insertion port and is suspended, and the housing is attached to the fastening means provided at the base portion with a fastening tool at substantially the center inside the space of the housing. The antenna radiator according to claim 1, wherein the antenna radiator is fixed to the antenna radiator.
In the antenna,
An antenna comprising the antenna radiator according to any one of claims 1 to 5.

Images