JPH09153722A - Antenna power feeding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To miniaturize an entire device by reducing its device scale without using any power distributor/synthesizer. SOLUTION: Transmission high frequency power inputted to a beam port 31a is distributed to antenna ports 32a-32d by a Butter matrix circuit 11 with equal amplitude and phase. The phases of respective transmission high frequency power are shifted by variable phase shifters 34a-34d. Further, the transmission high frequency power is respectively inputted through fixed phase shifters 36a-36d to short-circuiting circuits 41a-41d and fuller reflected. This reflected transmission high frequency power is respectively inputted through the fixed phase shifters 36a-36d to the variable phase shifters 34a-34d again. In this case, the phases are shifted again, the transmission high frequency power is supplied to the antenna ports 32a-32d of Butter matrix circuit 11, discrete Fourier transform is performed, and transmission high frequency power having prescribed amplitude and phase distribution is provided at beam ports 31b-31d.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antenna power supply device for a microwave ring band array antenna or the like, which forms a transmission high frequency power and a reception high frequency signal in a predetermined amplitude and phase distribution.

[0002]

2. Description of the Related Art Heretofore, as an example of setting transmission power and received high frequency signals to a predetermined amplitude and phase distribution using a Butler matrix circuit and a power distributor / combiner, see, for example, Japanese Patent Application Laid-Open No. 194702/1992. "It has been known.

FIG. 3 is a circuit diagram showing the configuration of such a conventional antenna power feeding device. The antenna power feeding device shown in FIG. 3 has a Butler matrix circuit 1 and a power distributor / combiner 6. The Butler matrix circuit 1 includes beam ports 11a, 11b, 11c and 11d, and antenna ports 12a and 12 to which an antenna (not shown) is connected.
b, 12c, 12d are provided.

Further, the power distributor / combiner 6 is provided with output ports 15a, 15b, 15c, 15d and an input port 16 which is supplied with a transmission high frequency power and outputs a reception high frequency signal at the time of reception. . Further, between the beam ports 11a to 11d of the Butler matrix circuit 1 and the output ports 15a to 15d of the power distributor / combiner 6, a variable phase shifter 21a for varying the phase therebetween,
21b, 21c, 21d are connected.

Next, the operation of the conventional example will be described. During transmission, the transmission high frequency power input to the input port 16 of the power distributor / combiner 6 is distributed to the output ports 15a to 15d with the same amplitude and phase and output to the variable phase shifters 21a to 21d, respectively. . Variable phase shifter 21a-
Reference numeral 21d denotes a phase shifter for the transmission high frequency power, and the beam ports 11a to 11 of the Butler matrix circuit 1 have a predetermined phase distribution.
d. In the Butler matrix circuit 1, the discrete Fourier transform (FFT) is performed to perform the antenna port 12
a to 12d.

The amplitude and phase of the transmission high frequency power output to the antenna ports 12a to 12d are variable.
A predetermined distribution is set by adjusting the phase of each transmission high frequency power input to the beam ports 11a to 11d at 1a to 21d. At the time of reception, the received high frequency signal received by the antenna (not shown) also has a predetermined amplitude and phase distribution.

[0007]

In such a conventional antenna power feeding device, the configuration of the power distributor / combiner 6 is complicated and large. For this reason, there is a drawback that the device size of the antenna feeding device becomes large and the entire device becomes large.

The present invention solves the problems in the prior art as described above, and uses one Butler matrix circuit for power distribution / combining and discrete Fourier transform (F).
FT) to reduce the size of the device without using a power divider / combiner, thereby providing an antenna power feeding device that can be downsized.

[0009]

In order to achieve the above object, the antenna power feeding device according to the invention of claim 1 transmits a transmission high frequency power input to one of a plurality of beam ports to a plurality of antenna ports. A Butler matrix circuit that distributes and outputs, a plurality of variable phase shifters that are respectively connected to the antenna ports of the Butler matrix circuit, and a plurality of short-circuit circuits that are connected to the other ends of the plurality of variable phase shifters. Each of the transmission high-frequency power transmitted from the antenna port of the Butler matrix circuit is phase-shifted by each variable phase-shifting means, and is totally reflected by each short-circuit circuit, and again by the variable phase-shifting means. At the same time as being phase-shifted, it is input to the Butler matrix circuit and discrete Fourier transform is performed. There is a configuration in which gain strength.

According to another aspect of the present invention, there is provided, as the variable phase shift means, a plurality of variable phase shifters each having one end connected to an antenna port of a Butler matrix circuit, and a plurality of variable phase shifters. The other end is connected to each one end, and a fixed phase shifter having a short circuit connected to each other end is provided.

An antenna feeding device according to a third aspect of the present invention is configured such that the antenna feeding device according to the first or second aspect forms a high frequency signal received by an antenna into a predetermined amplitude and phase distribution.

According to a fourth aspect of the present invention, the antenna power feeding device according to the first or second aspect is applied to feed a microwave ring array antenna.

In the antenna power feeding device having such a configuration, the transmission high frequency power input to one of the plurality of beam ports is distributed to the antenna port by the Butler matrix circuit and output. The transmission high-frequency power sent from this antenna port is phase-shifted by each variable phase-shifting means, and is totally reflected by each short-circuit circuit. The transmission high-frequency power totally reflected is again phase-shifted by the variable phase-shifting means and input to the Butler matrix circuit. Here, the discrete Fourier transform is performed, and the transmission high frequency power having a predetermined amplitude and phase distribution is obtained from the beam port. Also, a predetermined amplitude and phase distribution is obtained for the received high frequency signal received in the same manner.

Therefore, in the Butler matrix circuit,
Power distribution / synthesis and Discrete Fourier Transform (FFT)
This eliminates the need for the power distributor / combiner as in the prior art, reduces the size of the device, and downsizes the entire device.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of an antenna power feeding device of the present invention will be described in detail with reference to the drawings. FIG. 1 is a circuit diagram showing the configuration of an embodiment of the antenna power feeding device of the present invention. The antenna power feeding device shown in FIG. 1 has a Butler matrix circuit 11. The Butler matrix circuit 11 has a beam port 31a to which transmission high frequency power is input and a beam port 3 which distributes and outputs the transmission high frequency power input to the beam port 31a.
1b, 31c, 31d and antenna ports 32a, 32
b, 32c, 32d are provided.

One ends of the variable phase shifters 34a, 34b, 34c and 34d are connected to the antenna ports 32a to 32d, and the other ends of the variable phase shifters 34a to 34d are fixed phase shifters 36a and 36a, respectively. 36b, 36c, 36d
, Connected to one end of each. The fixed phase shifters 36a to 36d are connected at their other ends with the short circuit 41.
a, 41b, 41c, 41d are connected to each.

Next, the operation of this embodiment will be described. FIG. 2 is a diagram for explaining the operation of this embodiment. In FIG. 2A, when the transmission high frequency power input to the beam port 31a is distributed to the beam ports 31b to 31d and transmitted from an antenna not shown, first, the beam port 31a of the Butler matrix circuit 11 is transmitted.
The transmission high frequency power is input to the antenna, and the transmission high frequency power is transmitted to the antenna port 3 by the Butler matrix circuit 11.
Distributed with amplitude and phase equal to 2a-32d.

The respective transmission high frequency powers from the antenna ports 32a to 32d are input to the variable phase shifters 34a to 34d, respectively. The transmission high frequency power is phase-shifted by the variable phase shifters 34a to 34d and input to the fixed phase shifters 36a to 36d, respectively. Then, as shown in FIG. 2B, the transmission high-frequency power from the fixed phase shifters 36a to 36d is totally reflected by the short circuit 41a to 41d. The reflected transmission high frequency power is input again to the variable phase shifters 34a to 34d through the fixed phase shifters 36a to 36d. Here, the phase is again shifted, and the phases are supplied to the antenna ports 32a to 32d of the Butler matrix circuit 11.

In this case, the antenna ports 32a to 32d
Of each of the transmission high frequency power of the variable phase shifters 34a to 34
d has a predetermined phase distribution, and the Butler matrix circuit 11 performs discrete Fourier transform corresponding to this phase distribution to obtain predetermined amplitude and phase distribution in the beam ports 31b to 31d. Note that a predetermined amplitude and phase distribution can be similarly obtained for a received high frequency signal received by an antenna (not shown).

In such an operation, the Butler matrix circuit 1 used as an input port for transmitting high frequency power.
In order to prevent the transmission high frequency power from being output from the beam port 31a of No. 1, the phase distribution is set to the antenna ports 32a to 3a.
The variable phase shifters 34a to 34d are adjusted so as to be applied to 2d.

[0021]

As is apparent from the above description, according to the antenna power feeding device of the present invention, the transmission high frequency power distributed to the antenna port of the Butler matrix circuit is phase-shifted by each variable phase shift means. At the same time, the light is totally reflected by the short circuit, is again phase-shifted by the variable phase shifter, and is input to the Butler matrix circuit. Here, the discrete Fourier transform is performed, and the transmission high frequency power having a predetermined amplitude and phase distribution is obtained from the beam port. Also, a predetermined amplitude and phase distribution is obtained for the received high frequency signal received in the same manner.

As a result, the power distributor / combiner is not required, the device scale is reduced, and the entire device can be downsized.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing a configuration of an antenna power feeding device according to an embodiment of the present invention.

FIG. 2 is a diagram for explaining the operation of the embodiment.

FIG. 3 is a circuit diagram showing a configuration of a conventional antenna power feeding device.

[Description of Reference Signs] 11 Butler matrix circuit 31a to 31d Beam port 32a to 32d Antenna port 34a to 34d Variable phase shifter 36a to 36d Fixed phase shifter 41a to 41d Short circuit

Claims (4)

[Claims] 1. A Butler matrix circuit for distributing transmission high frequency power input to one of a plurality of beam ports to a plurality of antenna ports and outputting the plurality of antenna ports, and a plurality of Butler matrix circuits respectively connected to the antenna ports of the Butler matrix circuit. Variable phase shifting means and a plurality of short circuit connected to the other end of each of the plurality of variable phase shifting means, each transmitted high-frequency power sent from the antenna port of the Butler matrix circuit, The phase is shifted by each of the variable phase shift means, and is totally reflected by each of the short circuit and again shifted by the variable phase shift means, and is input to the Butler matrix circuit and discrete Fourier transform is performed. And a transmission high frequency power having a predetermined amplitude and phase distribution is obtained from the beam port. 2. As the variable phase shift means, a plurality of variable phase shifters each having one end connected to an antenna port of the Butler matrix circuit, and the other end of each of the plurality of variable phase shifters respectively. The antenna power feeding device according to claim 1, further comprising a fixed phase shifter connected to one end and a short circuit connected to each of the other ends. 3. A high-frequency signal received by an antenna by the antenna feeding device according to claim 1 or 2,
An antenna feeding device characterized by being formed with a predetermined amplitude and phase distribution. 4. An antenna feeding device, wherein the antenna feeding device according to claim 1 or 2 is applied for feeding a microwave band ring array antenna.