JPH07176942A - Antenna for receiving linearly polarized wave - Google Patents

Abstract

PURPOSE:To provide the linearly polarized wave reception antenna using one patch antenna element to receive a horizontally polarized wave and a vertically polarized wave in common. CONSTITUTION:A series circuit comprising a capacitor 3(8) and a diode 4(9) is connected to a position of a feeder circuit 2(7) apart from a patch antenna element 1 by a length equivalent to nearly 1/4 wavelength of a radio wave to be connected to ground with respect to the feeder circuit 2(7) connecting to the patch antenna element 1 in orthogonal directions, and a connecting point between the capacitor 3(8) and the diode 4(9) is connected to a DC power supply via a choke coil 5(10) as a 1st (2nd) impedance circuit network. A horizontally polarized wave signal is extracted from the feeder circuit 2 by short-circuiting the 2nd impedance circuit network and a vertically polarized wave signal is extracted from the feeder circuit 2 by short-circuiting the 1st impedance circuit network.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a patch antenna element for receiving linearly polarized waves, and more particularly to an element capable of receiving both horizontally polarized waves and vertically polarized waves.

[0002]

2. Description of the Related Art As a conventional patch antenna element for linearly polarized wave reception, as shown in FIG. 3, square or circular patch antenna elements 15 and 17 are used, and the central axis is a square or circular center. Feeding circuits 16 or 18 are attached so as to pass through, and a desired linearly polarized wave is applied to each patch antenna element 15 or 17 respectively.
It was combined with and received.

[0003]

Therefore, only one of the linear polarized waves can be received, and the horizontal polarized wave and the vertical polarized wave are not commonly received. An object of the present invention is to provide a linearly polarized wave receiving antenna capable of receiving horizontally polarized waves and vertically polarized waves by using one patch antenna element.

[0004]

A linearly polarized wave receiving antenna of the present invention comprises a linearly polarized wave patch antenna element and two feeding circuits attached to the linearly polarized wave patch antenna element in directions orthogonal to each other. A first impedance circuit network and a second impedance circuit network provided at a position having a length of about ¼ wavelength of a radio wave coupled from the patch antenna element to the patch antenna element with respect to each of the feeding circuits. 1
The impedance circuit network is short-circuited, and the linearly polarized signal is taken out from the feeding circuit provided with the other second impedance network, and the second impedance network is short-circuited and the other first impedance network is provided. A linearly polarized signal that is cross-polarized with respect to the linearly polarized signal is extracted from the power supply circuit.

[0005]

The present invention is configured as described above, and two feeding circuits are attached to the linearly polarized patch antenna element in directions orthogonal to each other, and the patch antenna element to the patch antenna are attached to each of the feeding circuits. If the first and second impedance networks are provided at positions where the length of the radio wave to be coupled to the element is approximately ¼ wavelength, and the impedance networks are short-circuited, the patch antenna element is connected to the same impedance network for feeding. Since the impedance seen from the circuit becomes infinite, the power feeding circuit is electrically disconnected from the patch antenna element and no signal is output. Therefore, if the first impedance network is short-circuited with respect to the horizontal polarization and the vertical polarization, one signal of the linear polarization can be taken out from the feeding circuit provided with the other second impedance network. When the second impedance network is short-circuited, a linearly polarized wave signal that is cross-polarized with respect to the linearly polarized wave signal can be taken out from the feeding circuit provided with the other first impedance network. The desired linearly polarized signal can be selected and received.

[0006]

FIG. 1 is a circuit diagram showing a first embodiment of a linearly polarized wave receiving antenna of the present invention. Reference numeral 1 denotes a square linearly polarized patch antenna element. Feeding circuits 2 and 7 are attached to the patch antenna element 1 in directions orthogonal to each other. The feeding circuits 2 and 7 are attached at the center of each piece. It is arranged so that The feeding circuit 2 is attached to the patch antenna element 1 in the horizontal direction, and the impedance circuit network is connected to a position having a length of ¼ wavelength of the radio wave to be coupled from the patch antenna element 1 to the patch antenna element 1, and similarly. The feeding circuit 7 is attached to the patch antenna element 1 in the vertical direction, and the impedance circuit network is connected to a position having a length of ¼ wavelength of a radio wave to be coupled from the patch antenna element 1 to the patch antenna element 1. .

The impedance circuit network provided in the power feeding circuit 2 comprises a DC blocking capacitor 3, a switching diode 4 and a choke coil 5 for blocking the passage of high frequency signals, and one end of the capacitor 3 is connected to the power feeding circuit 2. Connect the other end to the anode side of the diode 4, connect the cathode side to ground, connect the choke coil 5 between the capacitor 3 and the diode 4, and connect the other end of the choke coil 5 to the power supply terminal 6. is doing. When the DC voltage + B is supplied to the power supply terminal 6, the diode 4 becomes conductive and the connection point N of the capacitor 3 to the power supply circuit 2 can be grounded in a high frequency manner, and the impedance of the power supply circuit 2 seen from the patch antenna element 1 Is infinite, so the same power supply circuit 2
Is electrically disconnected from the patch antenna element 1 and no signal is output.

Similarly, the power feeding circuit 7 is also provided with an impedance network, which comprises a DC blocking capacitor 8, a switching diode 9 and a high frequency signal blocking choke coil 10. , One end of the capacitor 8 is connected to the power supply circuit 7, the other end is connected to the anode side of the diode 9, and the cathode side is connected to the ground, and the choke coil 1 is connected between the capacitor 8 and the diode 9.
0 and connect the other end of the choke coil 10 to the power supply terminal 1
Connected to 1. When the DC voltage + B is supplied to the power supply terminal 11, the diode 9 becomes conductive and the capacitor 8
Since the connection point M to the power feeding circuit 7 can be grounded at a high frequency, and the impedance seen from the patch antenna element 1 to the power feeding circuit 7 becomes infinite, the power feeding circuit 7 is electrically disconnected from the patch antenna element 1. Signal is not output.

It is assumed that horizontal polarized waves are incident on the patch antenna element 1 in the horizontal direction and vertical polarized waves are incident on the vertical direction. If a DC voltage + B is supplied to the power supply terminal 11 when the horizontal polarized wave is taken out, a horizontal polarized wave signal can be taken out from the power feeding circuit 2, and a DC voltage + B is supplied to the power source terminal 6 when the vertical polarized wave is taken out. A vertically polarized signal can be taken out from the power feeding circuit 7. Therefore, it becomes possible to select and receive a desired linearly polarized signal, and it is possible to receive the horizontally polarized wave and the vertically polarized wave in common by using one patch antenna element.

FIG. 2 is a circuit diagram showing a second embodiment of the linearly polarized wave receiving antenna of the present invention. In the figure, the same components as those shown in FIG. 1 are designated by the same symbols. . The difference from the embodiment of FIG. 1 is that a circular patch antenna element 12 is used instead of the square linear polarization patch antenna element 1. The feeding circuits 2 and 7 are attached to the patch antenna element 12 in directions orthogonal to each other, and each of the central axes of the feeding circuits 2 and 7 is arranged to face the center of the patch antenna element 12. . Other configurations and circuit operations are the same as those of the embodiment shown in FIG. 1, and their explanations are omitted.

[0011]

As described above, according to the present invention,
Two feeding circuits are attached to one patch antenna element from the directions orthogonal to each other, and an impedance circuit network is provided for each of the feeding circuits so that the feeding circuit can be electrically separated from the patch antenna element. By selecting the feeding circuit to be disconnected, it is possible to select and receive horizontal polarization and vertical polarization, and it is possible to provide a linear polarization reception antenna for both horizontal polarization and vertical polarization. .

[Brief description of drawings]

FIG. 1 is a circuit diagram showing a first embodiment of a linearly polarized wave receiving antenna of the present invention.

FIG. 2 is a circuit diagram showing a second embodiment of the linearly polarized wave receiving antenna of the present invention.

FIG. 3 is a diagram showing a conventional patch antenna element for linearly polarized wave reception.

[Explanation of symbols]

 1 Patch Antenna Element 2 Feeding Circuit 3 Capacitor 4 Diode 5 Choke Coil 6 Power Supply Terminal 7 Feeding Circuit 8 Capacitor 9 Diode 10 Choke Coil 11 Power Supply Terminal 12 Patch Antenna Element 15 Patch Antenna Element 16 Feeding Circuit 17 Patch Antenna Element 18 Feeding Circuit

Claims (2)

[Claims] 1. A linearly polarized patch antenna element, two feeding circuits mounted on the same linearly polarized patch antenna element in directions orthogonal to each other, and the patch antenna element for each of the feeding circuits. A first impedance circuit network and a second impedance circuit network provided at a position having a length of about ¼ wavelength of a radio wave to be coupled to the patch antenna element.
A linearly polarized signal is taken out from a power feeding circuit provided with the impedance circuit network, and the second impedance network is short-circuited to cross the linearly polarized signal from the other power feeding circuit provided with the first impedance network. An antenna for receiving a linearly polarized wave, which extracts a linearly polarized signal that becomes a polarized wave. 2. The impedance circuit network is connected between the power supply circuit and the ground in order to connect a DC blocking capacitor and a switching diode, and is connected between the capacitor and the diode via a choke coil for blocking the passage of high frequency signals. The linearly polarized wave receiving antenna according to claim 1, which comprises a DC power supply.