JPH06289081A - Antenna measuring apparatus - Google Patents

Abstract

(57) [Abstract] [Purpose] The purpose is to measure radiation characteristics in an arbitrary plane without changing the state of the antenna under test. [Structure] A plurality of counter antennas are provided so as to surround the antenna to be measured and face the antenna to be measured, and a turntable for rotating the antenna to be measured is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antenna measuring device for measuring radiation characteristics such as a radiation pattern of an antenna.

[0002]

2. Description of the Related Art FIG. 8 is a block diagram showing an antenna measuring device for measuring a radiation pattern disclosed in Japanese Patent Laid-Open No. 63-234168. In the figure, 1 is an antenna to be measured, 2 is an antenna to be measured 1, and a distribution circuit for extracting a part of an input signal of the antenna 1 to be measured and a part of a reflected signal from this antenna 1 to be measured is a distribution circuit 3. A transmission source connected to the circuit 2 and sending a signal to the distribution circuit 2, 4a to 4l
Is a counter antenna placed so as to surround the antenna to be measured 1 at a certain distance from the antenna to be measured 1 so as to face the antenna to be measured 1.
Switch circuit for switching each of the opposing antennas 4a to 4l one by one, 6 is an amplitude phase receiver, 7 is a calculator for calculating a radiation pattern from the amplitude and phase of the signal received by the amplitude phase receiver 6. , 8 is a radiation pattern display for displaying a radiation pattern, 9 is a control line for transmitting a control signal from the computer 7 to the switching circuit 5, 10 is a control line for transmitting a control signal from the computer 7 to the transmission source 3, 11 Is distribution circuit 2
A switch for switching between the input signal and the reflected signal extracted by 12 is a control line for sending a control signal from the computer 7 to the switch 11, 13 is a signal from the distribution circuit 2 extracted via the switch 11, and the switching circuit 5 A switch for switching the detection signals of the opposing antennas 4a to 4l taken out via the switch and sending them to the amplitude / phase receiver 6, 14 is a control line for transmitting a control signal from the calculator 7 to the switch 13, and 15 is the antenna under test. It is an impedance indicator which displays the input impedance of.

Next, the operation will be described. Control line 10
The signal of the transmission source 3 whose frequency has been set by the control signal sent from the computer 7 via the is sent to the distribution circuit 2.
The distribution circuit 2 takes out a part of the signal from the transmission source 3 as a reference signal to the terminal A and sends the remaining signal to the antenna under measurement 1. The antenna under test 1 reflects part of the signal sent from the transmission source 3 toward the distribution circuit 2 due to impedance mismatch, and radiates the rest into space. The distribution circuit 2 takes out a part of the signal reflected by the antenna under test 1 to the terminal B as a reflected signal. Further, each of the opposed antennas 4a to 4l detects a signal radiated into the space from the antenna 1 to be measured and sends it to the terminals a to 1 of the changeover switch 5, respectively. In this state, first, the terminal D and the terminal F of the changeover switch 13 are connected by the control signal sent from the computer 7 through the control line 14.
Then, the terminal A and the terminal C of the switch 11 are connected by the signal sent from the computer 7 via the control line 12, and the reference signal output to the terminal A of the distribution circuit 2 is switched to the switch 1
1. Send to the amplitude / phase receiver 6 via the changeover switch 13. The amplitude / phase receiver 6 receives the amplitude and phase of this reference signal.

Next, the terminals F and D of the switch 13 are connected, the terminals B and C of the distribution circuit 2 are connected, and the reflection signal output to the terminal B of the distribution circuit 2 is switched to the switches 11 and
The signal is sent to the phase amplitude receiver 6 via the changeover switch 13. The amplitude and phase receiver 6 receives the amplitude and the amplitude of this reflected signal. The computer 7 compares the amplitude and phase of the reference signal and the reflected signal received by the amplitude / phase receiver 6,
Calculate the input impedance of. The impedance indicator 15 displays the value of this input impedance.

Then, the terminal E and the terminal F of the changeover switch 13 are connected by the control signal sent from the computer 7 through the control line 14, and the terminal m of the changeover circuit 5 and the amplitude / phase receiver 6 are connected.
Connect. Then, the terminal a and the terminal m of the switching circuit 5 are connected by the control signal sent from the computer 7 through the control line 9, and the signal detected by the opposite antenna 4a is sent to the amplitude / phase receiver 6. The amplitude / phase receiver 6 receives the amplitude and phase of this signal. Hereinafter, the terminals b to l of the switching circuit 5 are sequentially connected to the terminal m by the control signal sent from the computer 7 via the control line 9, and the signals detected by the respective opposing antennas 4b to 4l are sequentially received in the amplitude and phase. And sends the amplitude and phase of the signal. The calculator calculates the radiation pattern of the antenna 1 to be measured from the amplitude and phase of the signals of the opposed antennas 4a to 4l received by the amplitude / phase receiver 6, and displays it on the radiation pattern display 8.

[0006]

Since the conventional antenna measuring apparatus is constructed as described above, the antenna measuring apparatus is used when measuring the radiation pattern of an arbitrary plane of the antenna 1 to be measured and of arbitrary polarization. Since it needs to be recombined, it takes a lot of measurement time, and each measurement condition is different.

[0007]

According to a first aspect of the present invention, a plurality of counter antennas are provided so as to surround the antenna to be measured and to face the antenna to be measured, and the antennas to be measured are mounted on a turntable. By doing so, the radiation characteristics of an arbitrary surface can be obtained under the same measurement conditions.

According to a second aspect of the present invention, in the antenna measuring apparatus according to the first aspect, a plurality of opposed antennas are divided into groups of two orthogonal polarized waves so as to face the antenna to be measured,
The radiation characteristic of two orthogonal polarized waves is obtained by rotating the measured antenna once.

According to the third aspect of the present invention, the opposing antenna is constructed so as to rotate as a whole so as to obtain a radiation characteristic in an arbitrary plane.

According to a fourth aspect of the present invention, in the antenna measuring apparatus according to the first or third aspect, a rotating mechanism for changing the polarization of each opposing antenna is provided to obtain radiation characteristics of arbitrary in-plane arbitrary polarization. It was done.

According to the present invention, a plurality of counter antennas are arranged so as to surround the antenna to be measured and to face the antenna to be measured, and an antenna measuring device for measuring radiated power of the antenna to be measured. At
A phase shifter is connected to each counter antenna, the phase amount of the phase shifter is changed, and the amplitude and phase of the radio wave received by the counter antenna connected to the phase shifter are measured. The above is performed in order to obtain the radiation characteristics of the antenna to be measured.

According to a sixth aspect of the present invention, in the antenna measuring device according to any one of the first to fifth aspects, a radio wave absorber is provided at a position after a plurality of opposing antennas, and the antenna to be measured is provided. The radiation characteristics in an arbitrary plane are obtained by rotating the.

[0013]

According to the invention of claim 1, the same measurement is performed by surrounding the antenna to be measured, providing a plurality of counter antennas so as to face the antenna to be measured, and providing a turntable for rotating the antenna to be measured. The radiation characteristic of an arbitrary surface is obtained under the conditions.

According to a second aspect of the present invention, in the antenna measuring apparatus of the first aspect, a plurality of opposing antennas are divided into two orthogonal polarization groups so as to face the antenna to be measured,
Radiation characteristics of two orthogonal polarized waves are obtained by rotating the measured antenna once.

In a third aspect of the present invention, a plurality of counter antennas are provided so as to surround the antenna to be measured and face the antennas to be measured, and a turntable for rotating the entire counter antennas is provided. Get the radiation characteristics.

According to a fourth aspect of the present invention, in the antenna measuring device according to the first and third aspects, a rotation mechanism for changing the polarization of the opposing antenna is provided to obtain radiation characteristics of arbitrary in-plane arbitrary polarization.

In a fifth aspect of the present invention, a plurality of counter antennas are arranged on the same circumference so as to surround the antenna to be measured so as to face the antenna to be measured, and the radiation power of the antenna to be measured is measured. In an antenna measuring device, connect a phase shifter to each opposing antenna, change the phase amount of the phase shifter, and measure the amplitude and phase of the radio wave received by the opposing antenna connected to the phase shifter. The radiation characteristic of the antenna under measurement is obtained by sequentially performing all the phase shifters.

According to a sixth aspect of the present invention, in the antenna measuring device according to any one of the first to fifth aspects, a radio wave absorber is provided at a position behind a plurality of opposed antennas, and the antenna to be measured is provided. The radiation characteristic in an arbitrary plane is obtained by rotating the.

[0019]

【Example】

Embodiment 1 An embodiment of the antenna measuring device according to the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an antenna measuring device. In the figure, 15 is a rotary base for rotating the measured antenna 1, 16 is an axis for rotating the measured antenna 1 on the rotary base 15, and 17 is a control line for transmitting a control signal from the computer 7 to the rotary base 15. is there. In the figure, the same symbols as those in FIG. 8 indicate the same things.

Next, the operation will be described. The turntable 15 is controlled by a control signal sent from the computer 7 via the control line 17.
Rotates the antenna under test 1 through the shaft 16 by the angle set by the computer 7. The following operation is the same as that of the conventional technique, and the description is omitted.

Embodiment 2 FIG. 2 is a block diagram showing another embodiment of the antenna measuring apparatus according to the present invention. In the figure, the same symbols as in FIG. 8 indicate the same things.

The operation is the same as in the first embodiment. First opposing antenna groups 4a-4f and second opposing antenna groups 4g-4
By using antennas of polarized waves orthogonal to each other at k, it is possible to measure and display a radiation pattern of orthogonally polarized waves in an arbitrary plane of the measured antenna 1.

Embodiment 3 FIG. 3 is a block diagram showing another embodiment of the antenna measuring apparatus according to the present invention, in which a power meter is used instead of the amplitude / phase receiver 6 of the first embodiment. In the figure, 18 is a power meter. In the figure, the same symbols as in FIG. 8 indicate the same things.

Next, the operation will be described. The turntable 15 is controlled by a control signal sent from the computer 7 via the control line 17.
Rotates the antenna under test 1 through the shaft 16 by the angle set by the computer 7. The signal of the transmission source 3 whose frequency is set by the control signal sent from the computer 7 via the control line 10 is sent to the antenna 1 to be measured and radiated into the space. Also,
The counter antennas 4a to 4k detect signals radiated into the space from the antenna 1 to be measured and detect terminals a of the changeover switch 5, respectively.
Send to ~ k. Then, the terminal a and the terminal m of the switching circuit 5 are connected by the control signal sent from the computer 7 through the control line 9, and the signal detected by the counter antenna 4a is supplied to the power meter 1
Send to 8. The power meter 18 receives this signal. Less than,
The terminals b to k of the switching circuit 5 are sequentially connected to the terminal m by a control signal sent from the computer 7 via the control line 9, and the signals detected by the opposing antennas 4b to 4k are sequentially connected to the power meter 1
8 and receives the signal. The calculator calculates the radiation pattern of the antenna under test 1 from the signals of the opposing antennas 4a to 4k received by the power meter 18, and displays it on the radiation pattern display 8.

Embodiment 4 FIG. 4 shows another embodiment of the antenna measuring apparatus according to the present invention. In the figure, reference numeral 19 is a radio wave absorber provided to eliminate the influence of the rear of each of the opposing antennas 4a to 4k. In the figure, the same symbols as in FIG. 8 indicate the same things.

The operation is the same as in the third embodiment. The radio wave absorber 19 is provided in the same manner in all the embodiments of the present invention, and has an effect of reducing the influence behind the counter antenna.

Embodiment 5 FIG. 5 is a block diagram showing another embodiment of the antenna measuring apparatus according to the present invention. In the figure, 20 is a pedestal that supports the respective opposed antennas 4a to 4k as a whole, and 21 is a shaft for rotating the gantry 20 by a rotary table 15.

Next, the operation will be described. The turntable 15 is controlled by a control signal sent from the computer 7 via the control line 17.
Rotates the gantry 20 by the angle set by the computer 7. The rest of the operation is the same as in the third embodiment.

Embodiment 6 FIG. 6 is a block diagram showing another embodiment of the antenna measuring apparatus according to the present invention. In the figure, reference numerals 22a to 22k denote rotating mechanisms for rotating the respective opposed antennas 4a to 4k.
Reference numerals 3a to 23k are control lines for transmitting control signals from the computer 7 to the rotating mechanisms 22a to 22k. Rotation mechanism 22a-2
The 2k may be a small motor or the like. In the figure, the same symbols as in FIG. 8 indicate the same things.

Next, the operation will be described. Control line 23a
The rotation mechanisms 22a to 22k can be rotated by the angle set by the computer 7 by the control signal sent from the computer 7 via 23k to 23k to match the polarization of the radio wave radiated in the space of the antenna 1 to be measured. The rest of the operation is the same as in the third embodiment.

Embodiment 7 FIG. 7 is a block diagram showing another embodiment of the antenna measuring apparatus according to the present invention. In the figure, 24a to 24k are phase shifters connected to the opposed antennas 4a to 4k, 25 is a combiner for combining received powers of the opposed antennas 4a to 4k, 2
6 is an amplitude receiver. In the figure, the same symbols as those in FIG. 8 indicate the same things.

Next, the operation will be described. First control line 2
The phase of the phase shifter 24a is changed by the control signal sent from the computer 7 via 3a. The amplitude receiver 26 receives the combined reception power of the opposing antennas 4a to 4k at that time. By changing the phase of the phase shifter 24a, the power received by the amplitude receiver 26 changes with a cosine curve. At this time, by using the phase amount of the phase shifter that gives the maximum value of the received power and the ratio of the maximum value and the minimum value of the received power, the amplitude and phase of the radio wave received by the opposing antenna 4a can be obtained. The measurement principle is "Mano, Kataki:
"Phase array antenna element excitation phase measurement method" T
rans. IECE '85 / 5 Vol. J65-B
No. 5 ”is clearer. This operation is performed by each phase shifter 24
The antenna to be measured 1 is applied sequentially to b to 24k.
The radiation characteristics of can be measured.

In the above embodiment, the antenna to be measured 1, the distribution circuit 2, the opposing antennas 4a to 4k, the phase / amplitude receiver 6, the calculator 7, the radiation pattern display 8, the changeover switch 13, the rotary base 15, and the electric power. 18 in total, electromagnetic wave absorber 1
9, frame 20, rotation mechanisms 22a to 22k, amplitude receiver 2
The format and structure of 6 are not specified. Further, the transmission source 3 and the antenna under measurement 1 may be integrated. Further, in the above embodiment, the number of the opposing antennas 4a to 4k is 11 elements, but the number can be set arbitrarily, and the opposing antennas 4a to 4f are arranged on the same circumference. However, the opposed antennas 4a to 4k may not be arranged on one plane.

[0034]

According to the first aspect of the present invention, a plurality of counter antennas are provided so as to surround the antenna to be measured and have the same distance from the antenna to be measured, and a turntable for rotating the antenna to be measured is provided. The radiation characteristics of an arbitrary surface can be obtained under the same measurement conditions.

According to a second aspect of the present invention, in the antenna measuring device according to the first aspect, the antennas to be measured are divided into a first opposed antenna group and a second opposed antenna group, and the polarized waves of the opposed antenna groups are made orthogonal to each other, whereby the measured antenna is Radiation characteristics of two orthogonal polarized waves can be obtained by making one rotation.

According to a third aspect of the present invention, a plurality of counter antennas are provided so as to surround the antenna to be measured and have the same distance from the antenna to be measured, and the entire counter antenna is rotated to radiate radiation in an arbitrary plane. The characteristics can be obtained.

According to a fourth aspect of the present invention, in the antenna measuring device according to the first and third aspects, a rotation mechanism for changing the polarization of the opposite antenna is provided, and the radiation characteristic of arbitrary in-plane arbitrary polarization can be obtained.

According to a fifth aspect of the present invention, a plurality of opposing antennas are arranged so as to surround the antenna to be measured and have the same distance from the antenna to be measured, and the antenna for measuring the radiation power of the antenna to be measured. In the measuring device, the phase shifter is connected to each counter antenna, the phase amount of the phase shifter is changed, and the amplitude and phase of the radio wave received by the counter antenna connected to the phase shifter are measured. The radiation characteristics of the antenna under test are obtained by sequentially performing the phase shifter.

According to a sixth aspect of the present invention, in the antenna measuring device according to any one of the first to fifth aspects, by providing a radio wave absorber behind the counter antenna, the influence behind the counter antenna is reduced. can do.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an antenna measuring apparatus showing an embodiment of the present invention.

FIG. 2 is a configuration diagram of an antenna measuring device showing another embodiment of the present invention.

FIG. 3 is a configuration diagram of an antenna measuring apparatus showing another embodiment of the present invention.

FIG. 4 is a block diagram of an antenna measuring device showing another embodiment of the present invention.

FIG. 5 is a configuration diagram of an antenna measuring device showing another embodiment of the present invention.

FIG. 6 is a block diagram of an antenna measuring device showing another embodiment of the present invention.

FIG. 7 is a block diagram of an antenna measuring device showing another embodiment of the present invention.

FIG. 8 is a configuration diagram showing a conventional antenna measuring device.

[Explanation of symbols]

 1 Antenna to be measured 2 Distribution circuit 3 Transmission source 4a-4l Opposing antenna 5 Switching circuit 6 Amplitude and phase receiver 7 Calculator 8 Radiation pattern indicator 9 Control line 10 Control line 11 Switch 12 Control line 13 Changeover switch 14 Impedance indicator 15 Rotation Platform 16 Axis 17 Control line 18 Power meter 19 Radio wave absorber 20 Frame 21 Axis 22a-22k Rotation mechanism 23a-23k Control line 24a-24k Phase shifter 25 Combiner 26 Amplitude receiver

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shinichi Sato 5-1-1 Ofuna, Kamakura-shi Electronic Systems Research Laboratories, Mitsubishi Electric Corporation (72) Inventor Takashi Kataki 5-1-1 Ofuna, Kamakura-shi Mitsubishi Electric Electronic Systems Research Institute, Inc.

Claims (6)

[Claims] 1. A plurality of counter antennas are arranged so as to surround the antenna to be measured and have an equal distance from the antenna to be measured, and the antennas to be measured are switched by switching the counter antennas. In the antenna measuring apparatus, the antenna measuring apparatus is configured to rotate the antenna to be measured. 2. A plurality of counter antennas are divided into a first counter antenna group and a second counter antenna group, and the polarization of the first counter antenna group is orthogonal to the polarization of the second counter antenna group. The antenna measuring apparatus according to claim 1, wherein the antenna measuring apparatus is configured as described above. 3. A plurality of counter antennas are arranged so as to surround the antenna to be measured and have an equal distance to the antenna to be measured, and the antennas are switched to measure the radiation power of the antenna to be measured. In the antenna measuring device, the antenna measuring device is configured to rotate the plurality of opposed antennas as a whole. 4. The antenna measuring apparatus according to claim 1 or 3, wherein each of the opposing antennas is configured to rotate about a straight line connecting the opposing antenna and the antenna to be measured as a rotation axis. 5. An antenna measuring apparatus for arranging a plurality of opposing antennas so as to surround the antenna to be measured and to have an equal distance from the antenna to be measured, and measuring the radiated power of the antenna to be measured. Connect the phase shifter to each counter antenna, change the phase amount of the phase shifter, and measure the amplitude and phase of the radio wave received by the counter antenna connected to the phase shifter. An antenna measuring device, characterized in that it is configured to perform sequentially with respect to each other. 6. A radio wave absorber is provided at a position behind the opposing antenna, according to any one of claims 1 to 5.
The antenna measurement device according to any one of items.