JPS592863B2 - Antenna pattern measurement device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a stable and highly accurate antenna pattern measuring device.

Conventionally, there have been devices of this type as shown in FIGS. 1 to 4.

Figures 1 and 2 show the configuration of the receiving antenna pattern measuring device when the transmitting pattern and receiving pattern of the antenna under test are the same, and Figures 3 and 4 show the transmitting pattern and receiving pattern. The configuration of an apparatus for measuring antenna patterns during transmission when the patterns are different is shown. Next, the operation will be explained.

In FIG. 1, microwave signals from a signal generator 16 are decomposed by a coupler 15, and each microwave signal is separated by a microwave transmission line 1.
1 to the transmitting antenna 14 and the receiver 3.
Here, the signal sent to the receiver 3 is a microwave reference signal intended for stable reception. On the other hand, a microwave signal radiated into space from the antenna 14 is received by the antenna under test 1 and then transmitted to the receiver 3 via the mixer 2. Further, the receiver 3 generates a detected and amplified video signal and sends it to the recording section 5 of the recorder 4 via the video signal transmission line 11.
On the other hand, since the antenna 1 is attached to the rotary table 9 via the support stand 10, its rotation angle is converted into a synchro signal by the synchro oscillator 8, and then transmitted to the synchro receiver 6 by the synchro signal transmission line T. . In this way, the recording section can obtain a reception pattern corresponding to the rotation angle of the antenna 1. Since the configuration of this measuring device is such that the transmitting pattern and the receiving pattern of the antenna under test are the same, the transmitting pattern is obtained as being the same as the receiving pattern. Note that FIG. 2 shows a configuration in which a space is used to transmit the reference signal, and the reference signal is sent and received by the transmitting antenna 14 and the reference signal receiving antenna 12. Next, the operations shown in FIGS. 3 and 4 will be explained.

In both FIGS. 3 and 4, the antenna under test 1 is a transmitting-only antenna device or an antenna device capable of transmitting and receiving, but these are configuration diagrams for measuring the transmitting pattern of an antenna device whose transmitting pattern and receiving pattern are different. be. In FIG. 3, a microphone mouth wave signal from a signal generator 16 is decomposed by a coupler 15 and transmitted to a test antenna 1 and a receiver 3 through each microwave transmission line 11.

The microwave signal radiated into space from the test antenna 1 is received by the receiving antenna 18 and transmitted to the receiver 3 via the mixer 2. Further, the receiver 3 generates a detected and amplified video signal, and transmits it to the recording section 5 of the recorder 4 via the video signal transmission line 17. On the other hand, since the test antenna 1 is attached to the rotary table 9 via the support stand 10, its rotation angle is converted into a synchro signal by the synchro oscillator 8, and then transmitted to the synchro receiver 6 via the synchro signal transmission line 7. be done. In this way, the recording section can obtain a transmission pattern corresponding to the rotation angle of the antenna under test 1. Note that FIG. 4 shows a configuration in which a space is used to transmit the reference signal, and the reference signal is sent and received by the transmitting antenna 13 and the receiving antenna 12. Since conventional antenna pattern measuring devices are configured as shown in Figures 1 to 4, the configuration shown in Figures 1 or 2 is not possible, especially for antenna devices with different transmission patterns and reception patterns. , the configuration shown in FIGS. 3 and 4 is inevitable. However, in both figures, the synchro signal transmission line 7
Since it is necessary to connect the transmitting and receiving points and is heavy, wiring is difficult. It is also expensive. In the case of FIG. 3, the reference signal transmission line 11 connects the receiver 3 and the coupler 15.
However, due to its loss, it becomes necessary to use a waveguide, which is practically impossible especially over long distances.

As described above, the conventional antenna pattern measuring device requires extensive wiring or piping work, and has the disadvantage that stable pattern measurement cannot be expected. This invention was made in order to eliminate the drawbacks of the conventional ones as described above, and it connects the transmitting and receiving points with a single video signal transmission line, and installs a pattern recorder on the antenna under test side and a pattern recorder on the receiving point side. A signal generator and receiver shall be installed, and three antennas shall be used, one of which shall be set to the same polarization as the test antenna, and the other two shall be set to orthogonal polarization or opposite polarization. The present invention aims to provide an antenna pattern measuring device that can stably measure transmission patterns.

An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 5, reference numeral 1 denotes a test antenna device provided on the transmission point side, and 9 a rotary table for rotating the antenna device 1, which holds the antenna device 1 via a support stand 10.

A synchro oscillator 8 generates a synchro signal according to the rotation angle of the rotary table 9.

7 is a line for transmitting a synchro signal to the synchro receiver 6 of the recorder 4; 5 is a recording section of the recorder 4;

Further, 16 is a signal generator provided on the receiving point side, 15 is a coupler that distributes the signal from the signal generator 16 and transmits it to the receiver 3 and the reference signal transmitting antenna 14, respectively, and 18 is provided on the receiving point side. , a receiving antenna that receives signals from the antenna device under test 1; 2, a mixer that mixes the signals received by the receiving antenna 18 and then transmits them to the receiver 3; 14, which is provided on the receiving point side; A reference signal transmitting antenna 12 is provided on the transmission point side to transmit a reference signal, and is a reference signal receiving antenna which receives a signal from this antenna 14. It is set to polarization perpendicular to the polarization or reverse polarization. 19 is an amplifier that amplifies the reference signal; 11
is a microwave transmission line, which is a line that connects various parts using microwaves.

Further, 17 is a video signal transmission line for transmitting the video signal output from the receiver 3 to the recorder 4 on the transmission point side. Next, the operation will be explained.

The microwave signal from the signal generator 16 is divided by the coupler 15, one of which is transmitted as a reference signal to the receiver 3, and the other is transmitted to the reference signal transmitting antenna 14 via the line 11.

The microwave radiated into space from the reference signal transmitting antenna 14 is received by the reference signal receiving antenna 12 installed near the antenna device under test 1, and is then amplified by the amplifier 19, and then the microwave is amplified by the amplifier 19. Power is supplied to the The antenna device under test 1 enters the transmitting state by this power supply. Next, the microwave signal radiated into space from the antenna device 1 under test is received by the receiving antenna 18 on the receiving point side, and then input to the receiver 3 via the mixer 2, where it is detected and amplified to become a video signal. , the video signal is input to the recorder 4 near the antenna under test 1 via the video signal transmission line 17. On the other hand, a rotation angle signal is generated by a synchro oscillator 8 by rotation of a rotary table 9 on which a support stand 10 for supporting the antenna device 1 is mounted, and is transmitted to a recorder 4 having a built-in recording section 5 and a synchro receiver 6. As a result, the angle signal and the video signal that changes depending on the rotation of the antenna device 1 are input to the recorder 4, so that
The antenna pattern is measured. Note that at this time, the test antenna 1 and the receiving antenna 18 have the same polarization, and the reference signal transmitting antenna 14 and the reference signal receiving antenna 12 have polarizations that are perpendicular or opposite to that of the test antenna 1. , the radio waves from test antenna 1 are received by receiving antenna 1.
The radio wave from the reference signal transmitting antenna 14 is received only by the reference signal receiving antenna 12. Although one amplifier 19 is used in the above embodiment, a plurality of amplifiers may be connected in series as required.

As described above, according to the present invention, since the transmitting and receiving points are connected by one video signal transmission line when measuring the transmitting antenna pattern, it is possible not only to reduce the weight and cost of the device, but also to reduce the weight and cost of the device. Since the line has low loss, it has the advantage of being able to measure stable and highly accurate transmitting antenna patterns.

[Brief explanation of the drawing]

1 to 4 are block diagrams of a conventional antenna pattern measuring device, and FIG. 5 is a block diagram of an embodiment of the present invention. 1... Test antenna, 3... Receiver,
4...Recorder, 12...Reference signal receiving antenna, 14...Reference signal transmitting antenna,
16... Signal generator, 17... Video signal transmission line, 18... Receiving antenna.

Claims (1)

[Claims] 1 Record the antenna pattern using the test antenna installed on the transmission point side, a signal provided on the transmission point side that indicates the rotation angle of the test antenna, and a video signal from a receiver on the reception point side, which will be described later. A recorder, a receiving antenna provided on the receiving point side and having the same polarization as the test antenna for receiving the signal from the test antenna, and a signal from the receiving antenna and a signal from a signal generator described later. an input receiver, a video signal transmission line for transmitting the video signal output of the receiver to the recorder, a signal generator provided on the receiving point side, and a signal generator provided on the receiving point side. a reference signal transmitting antenna having a polarization orthogonal to or opposite to the polarization of the test antenna for transmitting a signal from the device; and a reference signal from the reference signal transmitting antenna provided on the transmission point side. 1. An antenna pattern measuring device comprising: a reference signal receiving antenna having the same polarization as the antenna receiving the antenna.