JPS63108805A - Flat antenna system - Google Patents

Abstract

PURPOSE:To efficiently receive a tilt linearly polarized wave, by adjusting the tilt angle of a receiving polarized wave by using in combination an electrical adjusting means and a mechanical adjusting means. CONSTITUTION:A flat antenna system is constituted of a flat antenna main body 4 of a square shape in which antenna elements 3 are arranged in a matrix shape, and capable of receiving a horizontal and a vertical linearly polarized waves simultaneously, and a mounting device provided with a receiving polarized wave angle adjusting means receiving freely the tilt linearly polarized wave inclined in a horizontal or a vertical plane by rotating the flat antenna main body 4 within a radiating plane. A power supplying circuit 9 supplying power freely with a positive or a negative phase mutually is provided at both power supplying points A' and B' for the vertical and horizontal linearly polarized wave of the flat antenna main body 4, and the tilt linearly polarized wave inclined at + or -45 deg. for the horizontal and the vertical linearly polarized waves and a horizontal plane can be received freely at the flat antenna main body 4.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field 1] The present invention relates to a flat antenna device that receives radio waves from a geostationary satellite.

[Background technique? '! ] In general, geostationary satellites are located approximately 36,000 times above the Earth's equator.
Since it rotates in the same direction as Earth's zero pine, the position relative to Mi does not change when viewed from Earth, so it appears to be stationary. Here, the position of the geostationary satellite is not necessarily due south when viewed from the receiving point, so even if the radio waves emitted from the geostationary satellite are horizontally linearly polarized or vertically linearly polarized, the plane of polarization at the receiving point is horizontal. Otherwise, it becomes an inclined linearly polarized wave tilted with respect to the vertical plane. Therefore, the planar antenna that receives this tilted linearly polarized wave also needs to be tilted according to the slope of the plane of polarization.Therefore, conventionally, in this type of planar antenna, the main body of the planar antenna must be attached! If! ! The receiving polarization angle adjustment means provided in the antenna rotates the planar antenna body within the radiation plane by a predetermined angle to efficiently receive the tilted linearly polarized wave. However, if the planar antenna main body is rotated according to the inclination angle of the linearly polarized wave in order to receive the inclined linearly polarized wave, the external shape of the entire planar antenna device installed on a wall or roof becomes thicker. There was an inconvenience that it happened.

For example, the planar antenna main body 4, as shown in FIG.
Antenna elements 3 made of square patch elements are arranged in a matrix as shown in FIG.
The rectangular planar antenna main body 4 is attached to the bottom plate 7 via a mounting device M5 so as to cover the planar antenna main body 4, as shown in FIG. A cover 8 is placed over the top. Here,
As shown in FIGS. 6(i) to 6(c), the mounting device 5 is equipped with an elevation angle adjustment means 6m, an azimuth angle adjustment means 6b, and a reception polarization angle adjustment means 6c, and a telescopic arm. The holder main body 10 is moved by the elevation angle WIg adjusting means 6a.
1 in a vertical plane to adjust the elevation angle θa of the planar antenna body 4, and transfer it to the holder body 10.
2, the fixing screw 13 is rotatably attached in a horizontal plane.
The azimuth angle θb is adjusted by the azimuth angle mq means 6b consisting of the auxiliary holding i%14 fixed at The received polarization angle II is made rotatable within the radiation plane by inserting the provided protruding shaft 16, and is fixed with the fixing screw 17! ! The means 6a sets the reception polarization angle θC to IR1!
It is supposed to be done.

However, in such a conventional example, when receiving a linearly polarized wave whose polarization angle is 45°, the planar antenna main body 4 is used to radiate radiation as shown in FIG. 7(b). It is necessary to rotate the plane by 45 degrees, and when the planar antenna main body 4 is rotated according to the polarization angle in this way, the apparent vertical and horizontal dimensions L are as shown in Figure 7 (a). The size is about 1.4 times that of the case of . therefore,
It is necessary to set the sizes of the bottom plate 7 and the cover 8 in consideration of this dimension L', resulting in a problem that the overall shape becomes large.

[Objective of the Invention 1 The present invention has been made in view of the above points, and its purpose is to efficiently receive inclined linearly polarized waves without making the overall shape too large. The purpose of the present invention is to provide a planar antenna device that does not require a flat antenna.

[Disclosure of the Invention] (Structure) The present invention provides a rectangular planar antenna body in which antenna elements are arranged in a matrix and can simultaneously receive horizontal and vertical linearly polarized waves, and a rectangular planar antenna body in which the planar antenna body is arranged in a radiation plane. In a planar antenna device, a mounting device is provided with a receiving polarization angle 1191 means for freely receiving oblique linearly polarized waves tilted with respect to a horizontal or vertical plane by rotating at a horizontal plane or a vertical plane. A feeding circuit is installed at both feeding points for horizontal linearly polarized waves that can feed in the same phase or in opposite phases to each other, and the planar antenna body generates horizontal and vertical linear polarized waves as well as inclined linear polarization inclined at ±45° with respect to the horizontal plane. It is designed to be able to freely receive waves, efficiently receive tilted linearly polarized waves, and not to make the overall shape too large.

(Embodiment) Figures #11 to 3 show an embodiment of the present invention, which is a rectangular planar antenna body in which antenna elements 3 are arranged in a matrix so that horizontal and vertical linearly polarized waves can be received simultaneously. 4, and an installation equipped with a reception polarization angle adjuster Pi6a that rotates the planar antenna body 4 within the radiation plane to freely receive inclined linearly polarized waves tilted with respect to the horizontal or vertical plane! [1! ! In a planar antenna device similar to the conventional example, which is configured with A circuit 9 is provided,
The planar antenna main body 4 can freely receive horizontal and vertical linearly polarized waves as well as xi linearly polarized waves tilted by ±45° with respect to the horizontal plane. and as shown in FIG. 3, the strip line Sα
1 to Sα4, switch elements S made of PIN diodes, ~84, inductance elements L1 to L, and resistors R+ -R2. A control terminal ○a of the phase switching w69a is formed.

By appropriately applying a positive or negative control voltage (±5V) to cb, the switching elements S, -S are turned on and off, and the length of the strip fin through which the signal flows is changed to change the feeding point A of the planar antenna body 4. The power supply phase to ゛ is changed, and if the amount of change in strip fin length is ΔX and the equivalent wavelength of the received radio wave is λg, then the amount of phase change/JP is Δp=(ΔX/λg)X 360 , when reversing the feeding phase to both feeding points A'' and Bo (-P=180°), the strip fin length feeding to one feeding point A° is changed to λg/2 by the phase switching unit 9m.
(for example, change from the path indicated by the dotted arrow to the path indicated by the dashed-dotted arrow).

It goes without saying that when in-phase (AP = 0°), it is sufficient to set ΔX = 0 and feed power along the path indicated by the dotted arrow.Also, when receiving horizontally linearly polarized waves or vertically linearly polarized waves, , S, of the selection/synthesizing section 9b is turned on to supply power to one of the power supply points A', B'.

In addition, in the embodiment, as shown in FIG. 2, 4×4 antenna elements 3 are arranged in a matrix, and the horizontal and vertical components of the 4@ antenna elements 3 are combined by series connection, and the combined The components are combined by a tournament-type combination output section to obtain a larger antenna dinn than in the case of a single antenna element 3. In this case, the theoretical dinup is 12dB (=101og16), and 12G
At Hz (K u -B and), the antenna gain of antenna element 3 is 7 dB, so the gain is approximately 19 dB.
This results in an antenna gain of .

The operation of the embodiment will be described below. Now, the patch element which is the antenna element 3 is as shown in Fig. 1.
- It is formed into a square with side t set to 0.4 to 0.5λg (λg is the equivalent wave of the received radio wave (frequency used)), and the feeding point of this antenna element 3 is set at the center of one side ( When set to point A or BJ: 1.), it is possible to receive radio waves with a polarization angle parallel to the feeding direction to feeding points A and B, as shown in Figure 4 (a) and (b). It has become.

Therefore, the polarization inclination angles of the radio waves received at feeding points A and B differ from each other by 90 degrees, and the orthogonal horizontal linearly polarized waves VHs and vertical linearly polarized waves Vv are received. In this case, the cross polarization ratio is generally 20 dB or more.

Here, the feed point A is for horizontal linear polarization, and the feed point Bt-
In the case of vertical linear polarization, in the feeder circuit 9,
Either feed power to either feed point A or B, or feed power to feed point A,
Either feed power to B in the same phase, or feed point A, BI:3
! ; It is possible to arbitrarily select whether to feed power by phase, and when feeding to feeding point A, horizontal linear polarized wave vH as shown in Figure 4 (a) can be received, and to feeding point B. When power is supplied, a vertically linearly polarized wave Vv as shown in Fig. 4(b) can be received, and when power is supplied to both feeding points A and B in the same phase or in opposite phase, as shown in Fig. 4(c). Linearly polarized wave V 4%9V with an inclination angle of ±45° with respect to the horizontal plane as shown in
,,' can now be received.

By the way, the amount of decrease Gd in the reception output for a deviation of 10 between the polarization slope angle θ゛ of the received radio wave (linearly polarized wave) and the reception polarization slope angle θ is expressed as Gcl=20 log eos Aθ, and −θ
is 5°, 10°, 20°, etc., the amount of decrease Gd in reception output is 0.03 dB and 0.13 dB, respectively.
dB, 0.54 dB-..., and it is necessary to reduce this -0 as much as possible in order to efficiently receive the slope linearly polarized wave.
19E hand a (feeding circuit 9) and V mechanical adjustment means (reception polarization angle adjustment means 6c) are used together to reduce 10, and the reception polarization angle is electrically adjusted. After making rough adjustments by tilting it in 45° increments,
Fine adjustment is made within a range of ±22.5° using mechanical adjustment means similar to conventional ones. Therefore, the rotation range of the planar antenna main body 4 within the radiation plane is approximately 1/2 (±25°) compared to the conventional example, and the overall shape can be made smaller by making the bottom plate 7 and cover 8 smaller than the conventional example. For example, when receiving linearly polarized waves with a polarization angle of 45°, in the conventional example, the planar antenna main body 4 had to be rotated as shown in FIG. 7(b). However, in the embodiment, the planar antenna main body 4 is hardly rotated! ! ! (This means that it can be received as shown in Figure 7(a). In the embodiment, when receiving tilted linearly polarized waves with a polarization tilt angle of ±22.5°, , the rotation angle of the planar antenna main body 4 becomes maximum.

[Effect of the Invention J As described above, the present invention provides a rectangular planar antenna main body in which antenna elements are arranged in a matrix and can simultaneously receive horizontal and vertical linearly polarized waves, and a radiation surface of the planar antenna main body. The planar antenna Iff! consists of a mounting device equipped with a reception polarization angle adjustment means that allows the antenna to freely receive oblique linearly polarized waves tilted with respect to the horizontal or vertical plane. In this case, a feeding circuit is installed that can feed both the vertical and horizontal linearly polarized waves of the planar antenna body in the same phase or in opposite phases to each other. It is possible to freely receive tilted linearly polarized waves tilted by ±45°, and the received polarization tilt angle is adjusted using both electrical a adjustment means and mechanical gg means, so tilted linearly polarized waves can be received. can be received efficiently, and since coarse adjustment is performed by electrical g4 adjustment means and fine adjustment is performed by mechanical *q means,
The mechanical adjustment range for rotating the planar antenna body within the radiation plane can be narrowed, and the overall shape can be reduced.

[Brief explanation of the drawing]

FIG. 1(a) is a front view of essential parts of an embodiment of the present invention; FIG.
b) is a cross-sectional view of the main parts of the same as above, FIG. 2 is a diagram showing the schematic configuration of the same as above, FIGS. 6(a) to 6(c) are views showing the same mounting device as above, and FIG. 7 is a view showing problems in the conventional example. 3 is an antenna element, 4 is a planar antenna main body, 5 is a mounting device, 6C is a receiving polarization angle adjusting means, and 9 is a feeding circuit. Agent Patent Attorney Ishi 1) Mr. 7 (b) Figure 3 (b) Figure 4 (0) (b) Figure 6 Figure 6 (b) (C)

Claims (1)

[Claims] (1) A rectangular planar antenna body in which antenna elements are arranged in a matrix and can simultaneously receive horizontal and vertical linearly polarized waves, and the planar antenna body can be rotated within the radiation plane so that it can be rotated in the horizontal or vertical plane. A planar antenna device comprising a mounting device equipped with a reception polarization angle adjustment means that allows reception of tilted linearly polarized waves at a tilted angle,
A feeding circuit is installed at both feeding points for vertical and horizontal linearly polarized waves on the planar antenna body so that power can be fed in the same phase or in opposite phases to each other. A planar antenna device characterized by being able to freely receive tilted linearly polarized waves.