JP3524071B2 - Directional antenna - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a directional antenna capable of obtaining various directional characteristics.

[0002]

2. Description of the Related Art In the case of using the Internet in an apartment house, it is common to connect to the Internet through an Internet service provider using a line drawn into the apartment house. In this case, if the line is an optical fiber line, wide band transmission becomes possible and a high-speed digital line can be constructed. By the way, when a line is drawn into an apartment house, it is necessary to wire the drawn line to each subscriber's house. In this case, depending on the housing complex, there may be wiring to each house at the time of construction, but if it is not wired, new wiring must be done. However, it was almost impossible to newly add wiring inside due to its structure.

[0003]

In order to solve this, the structure shown in FIGS. 22 (a) and 22 (b) has been proposed.
However, FIG. 22 (a) is a front view showing the configuration,
FIG. 22 is a side view showing the structure. FIG. 22 (a)
In the configuration shown in (b), the optical fiber line laid via a telephone pole or the like is led into the apartment house 100, and the terminal communication device is provided at the terminal. This terminal communication device is provided with an antenna 101, and each subscriber's house in the apartment building 100 is also provided with an antenna. Then, the antenna 101 in the terminal communication device and the antenna in each subscriber's house are wirelessly connected. As a result, since each subscriber's house and the optical fiber line are connected by radio, it is possible to eliminate the need to provide new wiring in the apartment house 100. In this case, the antenna 101 provided in the terminal communication device
22 (a) and 22 (b), the directional characteristic of is included in all the subscribers in the apartment house 100.

FIG. 23 is a perspective view showing the structure of a conventional directional antenna. As shown in FIG. 23, the conventional antenna 101 includes one radiator unit 110 and one radiator unit 1.
Three reflectors 111, 11 arranged substantially parallel to
2 and 113 are provided. Three reflectors 111 and 11
Both ends of 2, 113 have a first mounting plate 114 and a second mounting plate 11
5 and 5 are fixed to each other using bolts and nuts. These three reflectors 111, 112, 113 are
The radiator unit 1 is arranged so that it is substantially evenly spaced from the radiator unit 110.
The antenna 10 is fixed around the antenna 10.
The directivity of 1 has been determined. Further, the lower part of the radiator portion 110 is fixed to a fixture 117 by a fixture 116, and the antenna 101 is fixed to the antenna pole by attaching the fixture 117 to the antenna pole. Electric power is supplied to the radiator section 110 from a coaxial connector 118 provided at the lower end. However, there are various external shapes of the apartment house 100, and the antenna 101 needs to have directional characteristics that match the shape. That is, the conventional configuration has a problem in that a plurality of types of antennas 101 having various directional characteristics must be prepared.

Therefore, an object of the present invention is to provide a directional antenna which can obtain various directional characteristics without preparing a plurality of types of antennas.

[0006]

In order to solve the above-mentioned problems, a directional antenna according to the present invention comprises a radiating element and a plurality of reflecting elements which are arranged substantially parallel to each other with a predetermined distance from the radiating element. In the directional antenna, the both ends of the plurality of reflecting elements are provided with a pair of angle adjusting plates respectively fixed to mounting surfaces arranged substantially in parallel, and the mounting surfaces of the pair of angle adjusting plates are provided on the mounting surfaces. A bent mounting groove is formed so that the fixing positions of some of the plurality of reflective elements can be changed.

In the directional antenna of the present invention, the mounting groove may be a zigzag bent mounting groove. Further, in the directional antenna of the present invention, the plurality of radiating elements are fixed to the pair of angle adjusting plates by tightening a nut, and the nut fixing the reflective element is loosened. At this time, the reflective element may be movable in the mounting groove.

According to the present invention as described above, it is possible to change the mounting position by moving some of the plurality of reflecting elements in the mounting groove formed by bending. Then, by changing the mounting position of the reflecting element with respect to the radiating element, it is possible to change the directional characteristics of the directional antenna to match the desired directional characteristics. In this case, if the mounting groove is formed in a zigzag shape, more kinds of directional characteristics can be obtained.

[0009]

1 to 3 show the configuration of an embodiment of a directional antenna according to the present invention. However, FIG. 1 is a perspective view of the directional antenna 1 according to the present invention, FIG. 2 is a plan view thereof, and FIG. 3 is a top view thereof. Note that a part of the mounting structure is not shown in FIG. The directional antenna 1 according to the present invention includes one radiator portion 10 and three reflectors 11, 12, 13 arranged substantially parallel to the radiator portion 10 as shown in FIGS. 1 to 3. I have it. Both ends of the three reflectors 11, 12, and 13 are fixed to the first angle adjusting plate 14 and the second angle adjusting plate 15, respectively. For example, a bolt 11a is provided at one end of the reflector 11, and the bolt 11a is used for the first angle adjusting plate 1
It is provided through the mounting hole formed in 4,
The reflector 11 is fixed to the first angle adjusting plate 14 by screwing the nut 19a onto the penetrating bolt 11a. Similarly, one end of each of the other reflectors 12, 13 is fixed to the first angle adjusting plate 14, and the reflectors 11, 12, 13
The other end of is similarly fixed to the second angle adjusting plate 15.

Further, the directional antenna 1 according to the present invention
Is characterized in that each of the first angle adjusting plate 14 and the second angle adjusting plate 15 is formed with a pair of bent grooves 14b. In this case, the first angle adjusting plate 1
4 and the pair of bending grooves 14b formed on the second angle adjusting plate 15 have substantially the same shape.
The ends of the reflector 12 and the reflector 13 are attached to the first angle adjusting plate 14 and the second angle adjusting plate 15 by utilizing 4b. As a result, when the nuts that fix the reflector 12 and the reflector 13 are loosened, the radiator portion 1
The reflector 12 and the reflector 13 can move in the bending groove 14b while maintaining a state substantially parallel to 0. For example, as shown in FIG. 1, the reflector 12 and the reflector 13 can be fixed to the end of the bent groove 14b from the radiator section 10, and the radiator in the bent groove 14b as shown in FIGS. 2 and 3. The reflector 12 and the reflector 13 can be fixed to the end farthest from the portion 10.

Thus, the reflector 12 and the reflector 13
By changing the mounting position in the bent groove 14b, the relative positional relationship with the radiator unit 10 changes, and the directional characteristics of the directional antenna 1 change. Accordingly, when it is desired to change the directional characteristics of the directional antenna 1, the reflector 12 and the reflector 13 can be moved within the bending groove 14b and the mounting position thereof can be changed. A plurality of positions shown in FIG. 8 are prepared as the mounting positions of the reflector 12 and the reflector 13 in this case. In the example shown in FIG. 8, the mounting position of the reflector 11 is fixed, and the mounting positions of the reflector 12 and the reflector 13 are position A.
1, position B1, and position C1. in this case,
The position A1 is a mounting position capable of obtaining a half-value angle of about 150 ° as the half-value angle of the directional characteristic, and the position B1 is a mounting position capable of obtaining a half-value angle of about 120 ° as the half-value angle of the directional characteristic. The position C1 is a mounting position where a half value angle of about 90 ° can be obtained as a half value angle of the directional characteristic.

The radiator portion 10 and the second angle adjusting plate 15 bent and formed in an L shape are fixed to a fixture 16, and the fixture 16 has a directional antenna such as a pole. The fixture 17a for fixing 1 is fixed.
As shown in FIGS. 2 and 3, a total of four mounting bolts 17c are inserted into the mounting tool 17a, and the mounting bolts 17c are respectively inserted in the mounting brackets 17b. As shown in FIGS. 2 and 3, a pipe-shaped pole 30 that supports the directional antenna 1 is sandwiched between the attachment 17a and the attachment receiver 17b, and the four attachments 17b are inserted therethrough. At the end of the mounting bolt 17c, the mounting nut 1
7d is fastened. Further, a connector type coaxial plug 18 is provided at the lower end of the radiator portion 10. By connecting a plug type coaxial plug provided at the tip of the coaxial cable to this coaxial plug 18, The radiator unit 10 is supplied with power. Further, the pole 30 is provided substantially horizontally on, for example, the roof of the apartment house 100 shown in FIG. 22, and the directional antenna 1 is attached to the pole 30 so that the reflectors 12 and 13 are attached at positions within the bending groove 14b. By changing it, it is possible to obtain various directional characteristics including the directional characteristics shown in FIG.

Next, detailed configurations of respective parts of the directional antenna 1 according to the present invention are shown in FIGS. However, FIG. 4 is a diagram showing the configuration of the radiator housing portion 20 that constitutes the radiator portion 10, and FIG. 5 is a partial cross-sectional view thereof.
FIG. 3 is a diagram showing a configuration of a radiator 21. Also, FIG. 7 shows the first
FIG. 8 is a plan view and a front view showing the configuration of the angle adjusting plate 14, and FIGS. 8 to 11 are views showing a mounting position of the reflectors 11, 12, 13 in the first angle adjusting plate 14 and a modification example. Are a plan view, a front view, and a side view showing the configuration of the second angle adjusting plate 15.

As shown in FIGS. 4 to 6, the radiator portion 10 is shown.
Is composed of a radiator 21 shown in FIG. 6 and a radiator housing portion 20 in which substantially the entire coaxial connector 18 of the radiator 21 is partially housed. The radiator housing portion 20 is made of a radio wave permeable resin, and has a cylindrical radome portion 20b,
The radome part 20b includes a top part 20a fitted so as to close the tip of the radome part 20b, and a base part 20c fitted under the radome part 20b. A pair of bulging portions 20d are formed on the upper portion of the base portion 20c, and a pair of bulging portions 20d are formed with through holes 20e each having a screw cut on the inner peripheral surface. A bolt inserted into the fixture 16 is screwed into one end of the through hole 20e, so that the fixture 16 can be attached to the radiator housing portion 20. In addition, a bolt inserted into the second angle adjusting plate 15 is screwed to the other end of the through hole 20e, so that the second angle adjusting plate 15 can be attached to the radiator housing portion 20.

As shown in FIG. 6, the radiator 21 is composed of a sleeve antenna and a feeding portion thereof. The element 21a and the sleeve 21c have a connecting portion 21d.
Power is supplied from the coaxial cable 22 via the. An unbalanced-balanced converter (balun) can be built in the connecting part 21d. The coaxial cable 22 is connected to the coaxial connector 18. Further, a holder 21b as a spacer is fitted and inserted in the tip portion of the sleeve 21c. The radiator 21 having such a configuration can be inserted from the lower end of the radiator storage portion 20 to store the radiator 21 in the radiator storage portion 20. After the storage, screws are inserted through the mounting holes 20g formed in the base portion 20c and screwed onto the upper portion of the coaxial connector 18. When housed in this way, the outer peripheral surface of the holder 21b comes into contact with the inner peripheral surface of the radome portion 20b, whereby the radiator 21 is stably held in the radiator housing portion 20. .

Next, the detailed structure of the first angle adjusting plate 14 is shown in FIGS. FIG. 7A shows the first angle adjusting plate 1.
4 is a plan view, and FIG. 4B is a front view thereof. As shown in these figures, the first angle adjusting plate 14 is a pentagonal adjusting plate body 14 formed by processing a metal plate having a predetermined thickness.
The adjusting plate body 14a is formed with a mounting hole 14c at its top, and a mounting hole 14d is formed substantially at the center of the side facing the mounting hole 14c. A pair of V-shaped bent grooves 14b, which are substantially line-symmetrical with respect to the line connecting the mounting holes 14c and 14d, are formed in the adjustment plate body 14a.

The radiator portion 10 is mounted in the mounting hole 14c. At this time, the bolt inserted into the mounting hole 14c is used for the top portion 20a of the radiator housing portion 20 in the radiator portion 10.
By screwing on the screw part 20f provided on the
The radiator unit 10 is fixed to the first angle adjusting plate 14. Further, a bolt 11a fixed to the end of the reflector 11 is inserted into the mounting hole 14d, and a nut 19a is screwed from the tip of the bolt 11a, so that the reflector 11 moves to the first position.
It is fixed to the angle adjusting plate 14. Furthermore, a pair of bent grooves 1
Bolts fixed to the end portions of the reflector 12 and the reflector 13 are respectively inserted in 4b, and a nut is screwed from the tip portion of the bolts, whereby the reflector 12 and the reflector 13 form a pair of bent grooves 14b. Is fixed to an end portion or a bent portion of the. In this case, the directional characteristics of the directional antenna 1 can be changed by moving the mounting positions of the reflector 12 and the reflector 13 along the bent groove 14b as described above.

Next, FIG. 9 shows the structure of the adjusting plate body 44a of the first modification of the first angle adjusting plate 14. In the adjustment plate main body 44a of the first modified example, the bending opening of the pair of dogleg-shaped bending grooves 44b is narrowed.
The reflector 12 and the reflector 1 are provided in the pair of bent grooves 44b.
The bolts fixed to the end portions of No. 3 are respectively inserted, and the nuts are screwed from the tip portions of the bolts, whereby the reflector 12 and the reflector 13 are fixed to the end portions or the bent portions of the pair of bending grooves 44b. It In this case, reflector 1
The directional characteristics of the directional antenna 1 can be similarly changed by moving the mounting positions of the reflector 2 and the reflector 13 along the bending groove 44b to change the mounting positions. The other configurations are the same as the configurations of the adjustment plate body 14a, and thus the description thereof will be omitted.

Next, FIG. 10 shows the structure of the adjusting plate body 54a of the second modification of the first angle adjusting plate 14. In the adjusting plate main body 54a of the second modified example, the bending groove is a pair of zigzag bending grooves 54b having many bending portions. Bolts fixed to the end portions of the reflector 12 and the reflector 13 are inserted into the pair of zigzag-shaped bent grooves 54b, and a nut is screwed from the tip end of the bolts, whereby the reflector 12 and the reflector 12 are reflected. The device 13 has a pair of bent grooves 54.
It is fixed to the end portion or the bent portion of b. In this case, the mounting positions of the reflector 12 and the reflector 13 are set to the bending groove 5
4b is moved and changed, the directional antenna 1
The directional characteristics of can be changed. Since the number of bent portions in the bent groove 54b is large, many directional characteristics different from each other can be obtained. The other configurations are the same as the configurations of the adjustment plate body 14a, and thus the description thereof will be omitted.

Next, FIG. 11 shows the structure of the adjusting plate body 64a of the third modification of the first angle adjusting plate 14. In the adjusting plate body 64a of the third modified example, a long groove 64d is provided instead of the mounting hole 14d for fixing the reflector 11. A bolt 11a fixed to the end portion of the reflector 11 is inserted into the long groove 64d, and a nut 19a is screwed from the tip portion of the bolt 11a, whereby the reflector 1
1 is fixed to the long groove 64d. In this case, if the mounting position of the reflector 11 is moved along the long groove 64d and changed,
The directional characteristics of the directional antenna 1 can be changed.
Other configurations are the same as the configuration of the adjustment plate body 14a,
The description is omitted.

Next, the detailed structure of the second angle adjusting plate 15 is shown in FIGS. 12 (a), 12 (b) and 12 (c). 12A is a plan view of the second angle adjusting plate 15, FIG. 12B is a front view thereof, and FIG. 12C is a side view thereof. As shown in these figures, the second angle adjusting plate 14 is formed by bending a metal plate having a predetermined thickness into an L shape, and the shape of the adjusting plate body 15a forming the upper surface is deformed. It has a trapezoidal shape. The mounting hole 15 is provided in the center of the upper side of the adjusting plate body 15a.
c is formed. A pair of V-shaped bent grooves 15b which are substantially line-symmetrical with respect to the center line passing through the mounting hole 15c,
It is formed on the adjustment plate body 15a. The shape of the pair of bending grooves 15 b is the same as the bending groove 1 in the first angle adjusting plate 14.
It has almost the same shape as 4b.

The other end of the reflector 11 is mounted in the mounting hole 15c, and at this time, the reflector 11 is mounted in the mounting hole 15c.
The reflector 11 is fixed to the second angle adjusting plate 15 by inserting a bolt fixed to the other end of the reflector and screwing a nut from the tip of the bolt. Further, bolts fixed to the other ends of the reflector 12 and the reflector 13 are respectively inserted into the pair of bent grooves 15b, and nuts are respectively screwed from the tip portions of the bolts, whereby the reflector 12
The reflector 13 is fixed to the ends or the bent portions of the pair of bent grooves 15b. In this case, the mounting positions of the reflector 12 and the reflector 13 in the bending groove 15b are positions where the reflector 12 and the reflector 13 are substantially parallel to the radiator unit 10. That is, the first angle adjusting plate 1
The mounting position of the bent groove 14b in 4 and the mounting position of the bent groove 15b in the second angle adjusting plate 15 are the same. In this way, the directional characteristics of the directional antenna 1 can be changed by moving the attachment positions of the reflector 12 and the reflector 13 along the bent groove 15b.

On the lower side of the adjusting plate body 15a, there is provided a bent portion 15e which is formed by bending the lower side of the adjusting plate body 15 at a substantially right angle. From the adjustment plate body 15a to almost the center of the bent portion 15e, the reinforcing concave portion 15d (the convex portion 15d
h) has been formed. Further, a pair of insertion holes 15f is formed in the lower portion of the bent portion 15e. The second angle adjusting plate 15 is fixed to the radiator portion 10 by screwing a pair of bolts inserted into the pair of insertion holes 15f into the through holes 20e formed in the bulging portion 20d of the radiator portion 10. can do. Although a modification of the second angle adjusting plate 15 is not shown, it has a modification similar to the first angle adjusting plate 14. When the first angle adjusting plate 14 is one of the modified examples, the second angle adjusting plate 15
Is also a modified example of the same configuration.

Next, examples of antenna characteristics of the directional antenna 1 according to the present invention are shown in FIGS. The directional antenna 1 in this case is configured as shown in FIGS. 1 to 3, and the radiator 21 has the lengths of the element 21a and the sleeve 21c set so as to resonate at about 2450 MHz. FIG. 13 shows a directional antenna 1 configured as shown in FIGS.
The frequency characteristic of the voltage standing wave ratio (VSWR) when 350 MHz to 2550 MHz and the positions of the reflector 12 and the reflector 13 are set to the position C1 shown in FIG. 8 is shown. 2400MHz shown by mark 1 to 2500M shown by mark 3
In the frequency band of Hz, VSWR has good frequency characteristics of 1.1 to 1.7. In FIG.
In the directional antenna 1 configured as shown in FIGS. 1 to 3, frequencies 2350 MHz to 2550 MHz,
The positions of the reflector 12 and the reflector 13 are shown as position B in FIG.
The frequency characteristic of the voltage standing wave ratio (VSWR) when the value is 1 is shown. In the frequency band from 2400 MHz shown by mark 1 to 2500 MHz shown by mark 3, VS
WR has a good frequency characteristic of 1.3 to 1.5.

FIG. 15 shows a directional antenna 1 having the structure shown in FIGS. 1 to 3 with a frequency of 2350.
MHz to 2550 MHz, reflector 12 and reflector 13
9 shows the frequency characteristic of the voltage standing wave ratio (VSWR) when the position is set to the position A1 shown in FIG. In the frequency band from 2400 MHz shown by mark 1 to 2500 MHz shown by mark 3, VSWR is 1.18 to 1.4.
No. 1 has a good frequency characteristic. In FIG. 16, FIG.
In addition, in the directional antenna 1 configured as shown in FIG. 3, there is shown a directional characteristic in the horizontal plane when the frequency is 2450 MHz and the positions of the reflector 12 and the reflector 13 are position C1 shown in FIG. In this case, the half-value angle, which is the angle at which the gain of the directional characteristic decreases by 3 db, is set to about 88 °,
It can be seen that the half value angle of 90 °, which is the set value, is almost obtained.

In addition, FIG. 17 shows a directional antenna 1 having the structure shown in FIGS.
8 shows the directional characteristics in the horizontal plane when 450 MHz and the positions of the reflector 12 and the reflector 13 are set to the position B1 shown in FIG. In this case, the half-value angle, which is the angle at which the gain of the directional characteristic is decreased by 3 db, is about 122 °, and it is understood that the half-value angle of 120 °, which is the set value, is almost obtained. Further, FIG. 18 shows that in the directional antenna 1 configured as shown in FIGS. 1 to 3, the frequency 2450 MHz,
The positions of the reflector 12 and the reflector 13 are shown as position A in FIG.
The directional characteristic in the horizontal plane when 1 is shown. In this case, the half-value angle, which is the angle at which the gain of the directional characteristic is reduced by 3 db, is about 149 °, and it can be seen that the half-value angle of 150 °, which is the set value, is almost obtained.

Next, referring to FIG. 19, in the directional antenna 1 configured as shown in FIG. 1 to FIG.
8 shows a vertical in-plane directional characteristic when 450 MHz, the positions of the reflector 12 and the reflector 13 are set to the position C1 shown in FIG. In this case, the half-value angle, which is the angle at which the gain of the directivity characteristic decreases by 3 db, is set to about 64 °. Also, FIG.
0 is a directional antenna 1 having the configuration shown in FIGS.
9 shows a vertical in-plane directional characteristic when the positions of the reflector 2 and the reflector 13 are set to the position B1 shown in FIG. In this case, the half-value angle, which is the angle at which the gain of the directional characteristic decreases by 3 db, is about 6
It is set at 4 °. Further, in FIG. 21, in the directional antenna 1 configured as shown in FIGS. 1 to 3,
9 shows a vertical in-plane directional characteristic when the frequency is 2450 MHz and the positions of the reflector 12 and the reflector 13 are set to the position A1 shown in FIG. In this case, the gain of the directional characteristic is 3 db
The half-value angle, which is the decreasing angle, is about 55 °.

As described above, the vertical in-plane directional characteristics of the directional antenna 1 according to the present invention are substantially the same regardless of the mounting positions of the reflector 12 and the reflector 13. In the directional antenna 1, the half-value angle in the vertical in-plane directional characteristic is not required to be small as shown in FIG. 22B, and the directional characteristic shown in FIGS. 19 to 21 is sufficient. Is. In addition, the first angle adjustment plate 14
Can be modified examples shown in FIGS. 9 to 11, and when the configuration of the first angle adjusting plate 14 is any of the modified examples shown in FIGS. 9 to 11, the second angle adjusting plate 15 is adjusted accordingly. The configuration of is also changed to the same modification. Further, bolts are provided at both ends of the reflectors 11, 12, 13 and through holes are formed at the ends of the bolts in a direction substantially orthogonal to the axis thereof. Then, the ends of the bolts are inserted into the reflectors 11, 12, 13 to make the reflectors 11, 12, 13
The bolts are fixed to both ends of the reflectors 11, 12, and 13 by inserting the fixing screws, which are inserted into the insertion holes formed at the ends of the, into the through holes of the bolts and screwing the nuts. There is. In the above description, the antenna of the radiator 21 built in the radiator unit 10 is a sleeve antenna, but it may be a collinear antenna instead.

[0029]

As described above, according to the present invention, some of the plurality of reflecting elements can be moved in the mounting groove formed by bending to change the mounting position. Then, by changing the mounting position of the reflecting element with respect to the radiating element, it is possible to change the directional characteristics of the directional antenna to match the desired directional characteristics. In this case, if the mounting groove is formed in a zigzag shape, more kinds of directional characteristics can be obtained.

[Brief description of drawings]

FIG. 1 is a perspective view showing a configuration of an embodiment of a directional antenna according to the present invention.

FIG. 2 is a plan view showing a configuration of an embodiment of a directional antenna according to the present invention.

FIG. 3 is a top view showing the configuration of the directional antenna according to the embodiment of the present invention.

FIG. 4 is a plan view showing a configuration of a radiator housing portion according to the embodiment of the directional antenna of the present invention.

FIG. 5 is a partial cross-sectional view showing a configuration of a radiator housing portion according to the exemplary embodiment of the directional antenna of the present invention.

FIG. 6 is a diagram showing a configuration of a radiator according to an embodiment of a directional antenna of the present invention.

7A and 7B are a plan view and a front view showing the configuration of the first angle adjusting plate according to the embodiment of the directional antenna of the present invention.

FIG. 8 is a diagram showing a mounting position of a reflector of the first angle adjusting plate according to the embodiment of the directional antenna of the present invention.

FIG. 9 is a plan view showing a configuration of a first modification of the first angle adjusting plate according to the embodiment of the directional antenna of the present invention.

FIG. 10 is a plan view showing a configuration of a second modification of the first angle adjusting plate according to the embodiment of the directional antenna of the present invention.

FIG. 11 is a plan view showing a configuration of a third modification of the first angle adjusting plate according to the embodiment of the directional antenna of the present invention.

FIG. 12 is a plan view, a front view, and a side view showing a configuration of a second angle adjusting plate according to the embodiment of the directional antenna of the present invention.

FIG. 13 is a diagram showing a frequency characteristic of VSWR when a reflector mounting position of the directional antenna according to the exemplary embodiment of the present invention is set to C1.

FIG. 14 is a diagram showing frequency characteristics of VSWR when the mounting position of the reflector of the directional antenna according to the exemplary embodiment of the present invention is B1.

FIG. 15 is a diagram showing a frequency characteristic of VSWR when the mounting position of the reflector of the directional antenna according to the exemplary embodiment of the present invention is A1.

FIG. 16 is a diagram showing directional characteristics in the horizontal plane when the mounting position of the reflector of the directional antenna according to the exemplary embodiment of the present invention is C1.

FIG. 17 is a diagram showing directional characteristics in the horizontal plane when the mounting position of the reflector of the directional antenna according to the exemplary embodiment of the present invention is B1.

FIG. 18 is a diagram showing a directional characteristic in a horizontal plane when the mounting position of the reflector of the directional antenna according to the exemplary embodiment of the present invention is A1.

FIG. 19 is a diagram showing vertical in-plane directional characteristics when the mounting position of the reflector of the directional antenna according to the exemplary embodiment of the present invention is C1.

FIG. 20 is a diagram showing a vertical in-plane directional characteristic when the mounting position of the reflector of the directional antenna according to the exemplary embodiment of the present invention is B1.

FIG. 21 is a diagram showing vertical in-plane directional characteristics when the mounting position of the reflector of the directional antenna according to the exemplary embodiment of the present invention is A1.

22A and 22B are a front view and a side view showing a configuration in which a line is built with each house in an apartment house via wireless communication.

FIG. 23 is a diagram showing a configuration of an antenna installed in a conventional apartment house.

[Explanation of symbols]

1 Directional antenna, 10 Radiator part, 11, 12, 1
3 reflector, 11a bolt, 14 1st angle adjustment plate,
14a adjusting plate body, 14b bending groove, 14c mounting hole,
14d mounting hole, 15 second angle adjusting plate, 15a adjusting plate body, 15b bending groove, 15c mounting hole, 15d recessed portion, 15e bent portion, 15f insertion hole, 15g cutout portion, 15h convex portion, 16 fixing tool, 17a mounting portion Ingredients, 1
7b mounting bracket, 17c mounting bolt, 17d mounting nut, 18 coaxial plug, 19a nut, 20 radiator storage part, 20a top part, 20b radome part, 20
c base portion, 20d bulging portion, 20e through hole, 20f
Screw part, 20g mounting hole, 21 radiator, 21a element, 21b holder, 21c sleeve, 21
d connection part, 22 coaxial cable, 30 pole, 44
a adjusting plate body, 44b bending groove, 54a adjusting plate body, 54b bending groove, 64a adjusting plate body, 64d long groove, 100 apartment house, 101 antenna, 110 radiator part, 111, 112, 113 reflector, 114 first mounting Plate, 115 second mounting plate, 116 fixture, 117
Attachment, 118 coaxial plug

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) H01Q 15/14-19/22 H01Q 1/12 H01Q 3/20

Claims (3)

(57) [Claims] 1. A directional antenna comprising a radiating element and a plurality of reflecting elements which are arranged substantially parallel to each other with a predetermined distance from the radiating element, wherein both ends of the plurality of reflecting elements are substantially parallel to each other. A pair of angle adjusting plates that are respectively fixed to the mounting surfaces to be arranged are provided, and the fixing positions of some of the plurality of reflecting elements are changed on the mounting surfaces of the pair of angle adjusting plates. A directional antenna characterized in that a bent mounting groove capable of being formed is formed. 2. The directional antenna according to claim 1, wherein the mounting groove is a mounting groove bent in a zigzag shape. 3. The plurality of radiating elements are fixed to the pair of angle adjusting plates by tightening a nut, and when the nut fixing the reflecting element is loosened, the reflection element The directional antenna according to claim 1 or 2, wherein the element is movable in the mounting groove.