JPH07162227A - Polarized wave common-use antenna system - Google Patents

Abstract

PURPOSE:To provide a polarized wave common-use antenna system which can freely switch plural polarized waves and reduce size. CONSTITUTION:A sent signal inputted to a phase switch 26 is outputted from the phase switch 26 as four kinds of signal different in phase by the use of a control signal applied to a terminal 34 and fed to four feeding points 21, 22, 23, and 24 of a radiation microstrip patch element 25. In the feeding, the phase switch 26 switches phase differences among the respective feeding points 21, 22, 23, and 24 by the use of the control signal, and the polarized wave of a radio wave radiated from the radiation microstrip patch element 25 can be switched to one of linear, circular and elliptic polarized waves.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dual polarization antenna system for sharing different polarized waves in a satellite communication system or the like.

[0002]

2. Description of the Related Art Conventionally, as a polarization-sharing antenna system capable of switching polarization and sharing transmission / reception, the one shown in the configuration diagram of FIG. 4 has been used. In this figure, 1
Is a transmitter, 2 is a receiver, 3 is a transmission / reception demultiplexer, 4 is a changeover switch, 5 is a demultiplexer for orthogonal polarization separation, 6 is a 90-degree polarization converter, 7 is a horn antenna, and 8 is a reflecting mirror. Is.

The operation of the dual polarization antenna system including the above components will be described below. The transmission signal from the transmitter 1 is supplied to the changeover switch 4 through the transmission / reception branching filter 3, and is output to either one of the terminal 13 and the terminal 14. If the changeover switch 4 is switched to the side of the terminal 13, the output of the terminal 13 is input to the terminal 15 of the demultiplexer 5 for orthogonal polarization separation and is used as a horizontal polarization component for orthogonal polarization separation. It is output to the terminal 17 of the duplexer 5. Further, it is input to the terminal 18 of the 90-degree polarization converter 6 and is output to the terminal 19 of the 90-degree polarization converter 6 as right-handed circularly polarized light, and radiates radio waves to the reflecting mirror 8 via the horn 7. The radio waves reflected by the reflecting mirror 8 have opposite turning directions and are radiated into space as left-handed circularly polarized radio waves.

On the contrary, the changeover switch 4 has the terminal 1
When switched to the 4 side, the output of the terminal 14 is input to the terminal 16 of the orthogonal polarization separation demultiplexer 5 and is output as a polarization component perpendicular to the polarization component. It is output to the terminal 17 of the wave filter 5. Further, it is input to the terminal 18 of the 90-degree polarization converter 6, is output as a left-handed circularly polarized wave to the terminal 19 of the 90-degree polarization converter 6, and radiates radio waves to the reflecting mirror 8 via the horn 7. The radio waves reflected by the reflecting mirror 8 have the opposite turning directions, and are radiated into space as radio waves of right-handed circular polarization.

In the case of reception, the reception circular polarization is transmitted through the reflection mirror 8, the horn 7, the 90-degree polarization converter 6, and the orthogonal polarization separation demultiplexer 5 according to the principle of reciprocal transmission and reception. The left-handed circularly polarized wave is output to the terminal 13 and the right-handed circularly polarized wave is output to the terminal 14, and is received by the receiver 2 connected to the terminal 10 through the changeover switch 4 and the duplexer 3. .

[0006]

However, in such a conventional dual-polarization antenna system, when transmitting and receiving right-handed circular polarization and left-handed circular polarization, in addition to the changeover switch 4 and the duplexer 3. In addition, the demultiplexer 5 for orthogonal polarization separation is required, and there is a problem that the circuit scale is large and miniaturization is very difficult.

The present invention solves these problems, and freely switches a plurality of polarized waves without using the 90-degree polarization converter 6 and the orthogonal polarization separation demultiplexer 5 as in the prior art. Therefore, it is an object of the present invention to provide a dual-polarization antenna system that can realize the miniaturization of the device by reducing the circuit scale.

[0008]

In order to achieve the above object, a dual-polarization antenna system according to a first aspect of the present invention includes a dielectric plate and a radiation microstrip provided so as to face each other with the dielectric plate interposed therebetween. The radiation microstrip patch element has a patch element and a grounding conductor plate, four feeding points are provided on the radiation microstrip patch element at right angles to the point object, and the phase is switched by a phase switch connected to the feeding point. The phase difference between the feeding points is switched based on the control signal applied to the container.

According to a second aspect of the present invention, there is provided a dual-polarization antenna system having a dielectric plate, a radiation microstrip patch element and a grounding conductor plate which are provided so as to face each other with the dielectric plate interposed therebetween. The microstrip patch element has an asymmetrical shape with respect to the center of the dielectric plate, and the radiation microstrip patch element is provided with feeding points at four points orthogonal to the point object from the center of the dielectric plate. It is configured such that the phase difference between the feeding points is switched based on each control signal applied to each phase switching device by the phase switching device connected to each pair with two feeding points as a pair.

[0010]

According to the structure of the first aspect, the transmission signal input to the phase switching device becomes four types of signals having different phases by the control signal applied to the phase switching device, and is output from the phase switching device, and the emission micro Power is supplied to each of the four feeding points of the strip patch element. At the time of this power feeding, the phase changer switches the phase difference between the respective feeding points by the control signal, whereby the polarization of the radio wave radiated from the radiating microstrip patch element is changed to a linear polarization, a circular polarization, Switch to either elliptical polarization.

According to a second aspect of the present invention, the signals on the transmitting side and the receiving side are set to different frequencies, and a phase switch is provided corresponding to each signal on the transmitting side and the receiving side. The transmission and reception are simultaneously performed by separately switching the phase difference between each pair of the feeding points on the transmitting side and the receiving side of the two pairs of feeding points.

[0012]

Embodiments of the present invention will be described below with reference to FIGS. 1A and 1B are configuration diagrams of a dual polarization antenna system according to a first embodiment of the present invention. FIG. 1A is a plan view of a patch antenna A and FIG. 1B is a side view of the patch antenna A. Indicates. FIG. 1C shows the configuration of a dual-polarization antenna system of this embodiment using the patch antenna A.

1A and 1B, 25 is a circular or square radiating microstrip patch element, 40 is a ground conductor plate, 39 is a dielectric plate, 21, 22,
23 and 24 are feeding points provided at four points orthogonal to the point object from the center of the radiation microstrip patch element 25.
1a, 22a, 23a, 24a are coaxial lines for feeding, 21
Reference numerals b, 22b, 23b, and 24b are respective output terminals. In FIG. 1C, 26 is a phase switch, and 27
Is a transmission / reception switch, 28 is a transmitter, and 29 is a receiver.

The operation of the dual polarization antenna system including the above components will be described below. The signal output from the transmitter 28 is input to the terminal 30 of the transmission / reception changeover switch 27 and output to the terminal 32. This output signal enters the terminal 33 of the phase switch 26, and a linearly polarized wave shown in FIG. 2 (for example, horizontal polarized wave is shown as → in FIG. 2) is generated by the control signal from the terminal 34. If you want to transmit, the terminal 35 and the terminal 3 of the phase switch 26
No output to 7 and terminal 36 and terminal 36
In this case, a signal whose phase is delayed by 180 degrees from the terminal 36 is output to the terminal 38. By supplying this output signal to the feeding points 21, 22, 23, and 24 of the patch antenna A, no signal is supplied to the feeding points 21 and 23 in the radiating microstrip patch element 25, and the vertical component of the polarization is generated. No radiation occurs. Signals having a phase difference of 180 degrees are respectively supplied to the feeding point 22 and the feeding point 24, and the feeding point 2
Since the direction of the polarized wave excited from 2 and the direction of the polarized wave excited from the feeding point 24 are opposite to each other by 180 degrees, therefore, 18
Since signals with a phase difference of 0 degrees are fed respectively, this 2
The two polarized waves have the same phase and are radiated from the patch antenna A as horizontal polarized waves (linear polarized waves) as shown in FIG.

Similarly, when no output is made to the terminals 36 and 38 of the phase switch 26, and when the terminals 35 and 35 are set to the phase reference of 0 degrees, the terminals 37 to 18 are connected to the terminals 35.
When a signal with a 0 degree phase delay is output, patch antenna A
Emits vertically polarized waves (linearly polarized waves) as shown in FIG.

The terminals 35 and 3 of the phase switch 26 are also provided.
6 is set as the reference 0 degree, and when a signal delayed by 180 degrees in phase is output to the terminals 37 and 38, in the radiation microstrip patch element 25, the feeding points 21 and 2 are fed.
Signals are supplied to 2 in the same phase, and a vertical polarization component excited by the feeding point 21 and a horizontal polarization component excited by the feeding point 22 are excited in the same phase. They are combined in the direction of 45 degrees to the lower right of the figure. further,
Since signals are supplied to the feeding points 23 and 24 in phase with each other and 180 degrees out of phase from the feeding points 21 and 22,
The vertical polarization component excited by the feeding point 23 and the horizontal polarization component excited by the feeding point 24 are excited in the same phase, and these two polarizations are combined in the direction of 45 degrees downward to the right in the figure. It Therefore, the combined polarized waves at these four feeding points are radiated as the combined polarized waves (linear polarized waves) in the direction of 45 ° to the right as shown in FIG.

Similarly, the terminal 35 of the phase switch 26,
With reference to 38 as 0 degree, terminals 36, 37
When a signal delayed in phase by 180 degrees is output to the radiating microstrip patch element 25, the combined polarized waves of the four feeding points are polarized in the direction of 45 degrees to the left as shown in FIG. It is emitted as a wave (linearly polarized wave).

Further, the terminal 35 of the phase switch 26 is set to 0 degree as a reference, and in contrast to this, terminals 36, 37 and 38 are provided.
When signals with a phase delay of 90 degrees, 180 degrees, and 270 degrees are output to the radiation microstrip patch element 2,
In FIG. 5, the combined polarized waves at the four feeding points 21, 22, 23, and 24 are radiated as right-handed circularly polarized waves combined in the right turn with the passage of time as shown in FIG.

Similarly, the terminal 35 of the phase switch 26 is set to 0 degree as a reference, and the terminals 36, 37, 38
When signals having advanced phases having phase differences of −90 degrees, −180 degrees, and −270 degrees are output to the radiation microstrip patch element 25, four feeding points 2 are provided.
The combined polarized waves of 1, 22, 23, and 24 are radiated as left-handed circularly polarized waves combined into a left turn over time as shown in FIG.

Further, as shown in FIG. 2, the output is not output to the terminals 35 and 36 of the phase switch 26, but the terminal 37.
When the phase reference is 0 degrees, when a signal with a phase delay of 0 degrees <θ <90 degrees is output from the terminal 37 to the terminal 38, an upward elliptical polarized wave is generated, and the terminal 37 of the phase switch 26 is also used.
And output to the terminal 38 and the terminal 35 to the phase reference 0
If the degree is 0 degrees, the terminal 36 is 0 degrees <θ <90 from the terminal 35.
When a signal whose phase is delayed is output, elliptically polarized waves rising to the left are emitted.

By the above operation, the polarization of the radio wave radiated from the radiating microstrip patch element is changed to the linear polarization,
You can switch between circular polarization and elliptical polarization,
Right-hand circularly polarized light, left-handed circularly polarized wave, 0 °,
Polarizations such as 45 °, 90 °, and 135 ° linear polarizations and elliptical polarizations can be freely switched, and the circuit scale can be reduced and the device can be downsized.

3A and 3B are configuration diagrams of a dual polarization antenna system according to a second embodiment of the present invention. FIG. 3A shows a plan view of a patch antenna B and FIG. 3B shows a patch antenna B. FIG. FIG. 3C shows the configuration of a dual polarization antenna system using the patch antenna B of this embodiment.

In FIGS. 3 (a) and 3 (b), 45 is a circular or square radiating microstrip patch element, and 46 and 47 are elements provided to shift the resonance frequency. 40 is a ground conductor plate, 39 is a dielectric plate, 2
1, 22, 23, 24 are feeding points provided at four points orthogonal to the point object from the center of the radiation microstrip patch element 45, 21a, 22a, 23a, 24a are feeding coaxial lines, and 21b, 22b, 23b and 24b are respective output terminals. In FIG. 3 (c), 26a and 26b are phase switches, 28 is a transmitter, and 29 is a receiver.

The operation of the dual polarization antenna system including the above components will be described below. The signal output from the transmitter 28 is input to the terminal 48 of the phase switch 26a and output to the terminals 49 and 50. In this case, the terminal 51
For example, when it is desired to transmit a right-handed circularly polarized radio wave by a control signal from, when the terminal 49 of the phase switch 26a is set to the phase reference of 0 degrees, the terminal 50 has 90 degrees from the terminal 49. Outputs a signal with a delayed phase. By supplying this output signal to the terminals 21 and 24 of the patch antenna B, in the radiating microstrip patch element 45, a signal with a 90-degree phase difference is fed to the feeding point 21 and the feeding point 24, and two signals are fed. The combined polarized waves at the feeding points 21 and 24 are radiated from the patch antenna B as right-handed circularly polarized waves combined in a right-handed rotation with the passage of time as shown in FIG.

Similarly, when transmitting a left-handed circularly polarized radio wave, the terminal 49 of the phase switch 26a is set to the phase reference 0.
, The signal with the phase advanced by 90 degrees from the terminal 49 is output to the terminal 50. This output signal is sent to patch antenna B
In the radiating microstrip patch element 45, signals having a 90-degree phase difference are fed to the feeding points 21 and 24 in
The combined polarized wave at the two feeding points 21 and 24 is radiated from the patch antenna B as a left-handed circular polarized wave combined into a left turn with the passage of time as shown in FIG.

Further, the reception frequency fr becomes lower than the transmission frequency ft by fr <ft by the action of the elements 46 and 47, and simultaneous transmission / reception is possible. In the case of reception, the receiving circular polarization is the feeding point 2 due to the principle of reciprocal transmission and reception
A signal having a phase difference of 90 degrees is output to the terminals 2 and 23, and is received by the receiver 29 connected to the terminal 52 via the phase switch 26b.

For other polarizations, the phase switch 26
By switching the phase difference by the control signals 51 and 55 of a and 26b, it is possible to simultaneously perform transmission and reception with a combination of two polarizations among the combinations of the individual polarizations shown in FIG.

By the above operation, the phase difference between the two feeding points of the radiation microstrip patch element on the transmitting side and the feeding points on the receiving side can be switched separately.
It enables simultaneous transmission and reception.

[0029]

As described above, according to the present invention, the transmission signal input to the phase switching device becomes four types of signals having different phases by the control signal applied to the phase switching device and output from the phase switching device. Then, power is supplied to each of the four power supply points of the radiation microstrip patch element. At the time of this power feeding, the phase changer switches the phase difference between the respective feeding points by the control signal, whereby the polarization of the radio wave radiated from the radiating microstrip patch element is changed to a linear polarization, a circular polarization, It is possible to switch to either elliptical polarization.

Therefore, a plurality of polarized waves can be freely switched without using the conventional 90-degree polarization converter 6 and the orthogonal polarization separation demultiplexer 5, and the circuit scale can be reduced. The device can be downsized.

Further, the signals on the transmitting side and the receiving side are set to different frequencies, a phase switch is provided corresponding to each signal on the transmitting side and the receiving side, and two pairs of feeding points of the radiation microstrip patch element are provided. The phase difference between each pair of feeding points on the transmitting side and the receiving side can be switched separately, and simultaneous transmission and reception becomes possible.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a dual polarization antenna system according to a first embodiment of the present invention.

FIG. 2 is a diagram showing the relationship between the power supply phase difference and polarization in the same embodiment.

FIG. 3 is a configuration diagram of a dual polarization antenna system according to a second embodiment of the present invention.

FIG. 4 is a block diagram of a conventional dual polarization antenna system.

[Explanation of symbols]

 21,22,23,24 Feed point 25,45 Radiation microstrip patch element 39 Dielectric plate 40 Ground conductor plate

Claims (2)

[Claims] 1. A dielectric plate, and a radiation microstrip patch element and a grounding conductor plate, which are provided to face each other with the dielectric plate sandwiched therebetween, and the radiation microstrip patch element has a point point from its center. A dual-polarization antenna system in which a feeding point is provided at four points orthogonal to each other, and a phase switch connected to the feeding point switches a phase difference between the feeding points based on a control signal applied to the phase switching device. . 2. A dielectric plate, and a radiation microstrip patch element and a ground conductor plate which are provided to face each other with the dielectric plate sandwiched therebetween, and the radiation microstrip patch element is connected to the dielectric plate. The radiation microstrip patch element has an asymmetrical shape with respect to the center, and four feeding points are provided in the radiation microstrip patch element orthogonal to the point from the center of the dielectric plate. A polarization sharing antenna system for switching the phase difference between the feeding points based on each control signal applied to each phase switch by the connected phase switch.