TW202012945A - An automatic measurement system for antenna radiation pattern - Google Patents

Abstract

An automatic measurement system for antenna radiation pattern comprises an anechoic chamber, a high directional antenna, a robotic arm unit and a control and measuring unit. The robot arm unit is disposed in the anechoic chamber and moves the high directivity antenna to move between a plurality of measurement points, and the measurement points are all located on a hemispherical surface of a predetermined radius. The control and measurement unit uses the high directivity antenna to measure a radiation gain of an AUT (antenna under test), and constructs a half spherical radiation pattern of the AUT by using a plurality of radiation gains.

Description

Antenna radiation field type automatic measuring system

The invention relates to a measurement system, in particular to a system capable of automatically measuring the hemispherical radiation pattern of an antenna.

Referring to FIG. 1, the prior art antenna measurement system is to install a highly directional antenna 12 and a rotating base 13 in an anechoic chamber 11, and then place an antenna under test 14 on the rotating base 13, the rotation The base 13 has a function of rotating 360 degrees around the Z axis, and the highly directional antenna 12 has a function of manually adjusting the rotation about ±90 degrees around the X axis. The highly directional antenna 12 and the antenna under test 14 are respectively used to receive and transmit an electromagnetic wave, and the antenna under test 14 is rotated 360 degrees around the Z axis through the rotating base 13 to measure the XY plane. Two-dimensional radiation pattern.

The disadvantage of this prior art is that the position of the high directivity antenna 12 and the antenna under test 14 needs to be manually adjusted each time (the rotating base 13 rotates 360 degrees around the Z axis once is called once) Only one energy can get the radiation pattern of a two-dimensional plane. If you want to use N two-dimensional radiation patterns to construct a three-dimensional radiation pattern, you must manually adjust the tilt angle of the antenna 14 under test manually N times. This is not only inaccurate but also very time-consuming.

Since the known antenna development system has the aforementioned problems, it is necessary to develop a system that can automatically measure the hemispherical radiation field type of the antenna to improve the efficiency of antenna research and development.

The antenna radiation field type automatic measurement system of the present invention is suitable for measuring the hemispherical radiation field type of an antenna to be tested. The antenna to be tested includes a main radiation surface. The first preferred embodiment includes an electric wave dark room and a high pointing Antenna, a robot arm unit, and a control and measurement unit.

The anechoic chamber includes a top plate and a bottom plate relative to the top plate, the antenna to be tested is disposed close to the top plate, and the main radiation surface of the antenna to be tested is disposed toward the bottom plate.

The robot arm unit is disposed in the radio wave dark room, and includes a fixed seat and a movable arm, the fixed seat is provided on the bottom plate of the radio wave dark room, the movable arm extends from the fixed seat and has a clip arm portion, The high directivity antenna is arranged on the arm part of the object and is interlocked by the movable arm.

The control and measurement unit is electrically connected to the antenna to be tested, the highly directional antenna and the robot arm unit, and controls the robot arm unit to move the highly directional antenna to move between a plurality of preset measurement points, and The preset measurement points are all located on a hemispherical surface of a preset radius. When the highly directional antenna moves to each preset measurement point, the control and measurement unit passes through the antenna to be measured and The highly directional antenna respectively transmits and receives an electromagnetic wave to measure a radiation gain of the antenna to be measured. The control and measurement unit also uses the plurality of radiation gains corresponding to the measurement points to construct half of the antenna to be tested. A spherical radiation field pattern, and a circular opening defined by the hemispherical surface is directed to the top plate of the anechoic chamber and the antenna to be tested, and the antenna to be tested, the spherical center of the hemispherical surface and the fixing seat are on the bottom plate The projections in a normal direction overlap.

Preferably, the top plate of the anechoic chamber has an opening, the anechoic chamber further includes a window, the inner surface of the window is used to attach the antenna under test, and when the window is opened, the inner and outer spaces of the anechoic chamber communicate through the opening , And when the window is closed, the opening of the top plate is covered by the window, and the main radiation surface of the antenna to be tested is toward the bottom plate of the anechoic chamber.

Preferably, the movable arm further includes a rotating member, a first arm portion and a second arm portion. The rotating member has a rotating end and a joint, the rotating end is sleeved on the fixing base, the rotating member has a function of rotating from 0 to 360 degrees relative to the fixing base, and the axis of the rotating member and The spherical centers of the hemispherical surfaces are co-located in the normal direction of the bottom plate. The first arm has a first joint, a second joint, and an arm connecting the first joint and the second joint, and the first joint of the first arm is connected to the joint of the rotating member So that the first arm can rotate relative to the rotating member. The second arm has a first joint, a second joint, and an arm connecting the first joint and the second joint, and the first joint of the second arm and the first arm The two joints are connected so that the second arm can rotate relative to the first arm, and the clip arm is connected to the second joint of the second arm so that the clip arm can be opposed to the second arm部转。 Rotate.

Preferably, the control and measurement unit includes a radio frequency signal generator, a signal feeding fixture, a spectrum analyzer and a computer. The radio frequency signal generator outputs a radio frequency output signal of a preset size. The signal feeding fixture is electrically connected to the RF signal generator to receive the RF output signal, and has a probe and a camera lens, the camera lens is disposed toward the probe to assist in observing the image of the probe. Touching the antenna under test to transmit the RF output signal to the antenna under test, the antenna under test receives the RF output signal and converts it into the electromagnetic wave, and the highly directional antenna receives the electromagnetic wave and converts it into a RF receiving signal. The spectrum analyzer is electrically connected to the high directivity antenna to receive the radio frequency reception signal, and measures the amplitude of the radio frequency reception signal. The computer is electrically connected to the spectrum analyzer to obtain the amplitude of the RF received signal, and according to the amplitude of the RF received signal, the radiation gain of the highly directional antenna, the radius of the hemispherical surface and the path loss of the signal feeding fixture together Calculate the radiation gain of the antenna under test when the highly directional antenna is located at the measurement point, and construct the hemispherical radiation pattern of the antenna under test.

Preferably, the control and measurement unit includes a radio frequency signal generator, a signal feeding fixture, a spectrum analyzer and a computer. The radio frequency signal generator outputs a radio frequency output signal of a predetermined size, the highly directional antenna is electrically connected to the radio frequency signal generator to receive the radio frequency output signal and convert it into the electromagnetic wave, and the antenna under test receives the electromagnetic wave and converts it into a radio frequency Receive the signal. The signal feeding fixture has a probe and a camera lens. The camera lens is disposed toward the probe to assist in observing the probe image. The probe is used to touch the antenna to be tested to receive the RF reception signal. The spectrum analyzer is electrically connected to the signal feeding fixture to receive the radio frequency reception signal, and measures the amplitude of the radio frequency reception signal. The computer is electrically connected to the spectrum analyzer to obtain the amplitude of the RF received signal, and according to the amplitude of the RF received signal, the radiation gain of the highly directional antenna, the radius of the hemispherical surface and the path loss of the signal feeding fixture together Calculate the radiation gain of the antenna under test when the highly directional antenna is located at the measurement point, and construct the hemispherical radiation pattern of the antenna under test.

The antenna radiation field type automatic measuring system of the present invention is suitable for measuring the hemispherical radiation field type of an antenna to be tested. The antenna to be tested includes a main radiation surface. The second preferred embodiment includes an electric wave anechoic chamber and a reflector , A highly directional antenna, a robot arm unit, and a control and measurement unit.

The anechoic chamber includes a top plate and a bottom plate relative to the top plate, the antenna to be tested is disposed close to the top plate, and the main radiation surface of the antenna to be tested is disposed toward the bottom plate.

The highly directional antenna includes a main radiating surface, a main beam of the radiation pattern of the highly directional antenna is directed to the reflector, and an electromagnetic wave transmitted and received between the highly directional antenna and the antenna under test is incident on the reflection Mirror and is reflected.

The robot arm unit is disposed in the radio wave dark room, and includes a fixed seat and a movable arm, the fixed seat is provided on the bottom plate of the radio wave dark room, the movable arm extends from the fixed seat and has a clip arm portion, The object-holding arm has a first end and a second end, the reflector is disposed at the first end of the object-holding arm, and the high directivity antenna is disposed at the second end of the object-holding arm.

The control and measurement unit is electrically connected to the antenna to be tested, the high directivity antenna and the robot arm unit, and controls the robot arm unit to move the mirror between a plurality of preset measurement points, and these The measurement points are located on a hemispherical surface with a preset radius. When the mirror moves to each preset measurement point, the control and measurement unit transmits and receives through the antenna to be tested and the highly directional antenna respectively The electromagnetic wave is used to measure a radiation gain of the antenna under test. The control and measurement unit also uses the plurality of radiation gains corresponding to the measurement points to construct a half-spherical radiation pattern of the antenna under test, and, A circular opening defined by the hemispherical surface is directed toward the top plate of the anechoic chamber and the antenna to be tested, and the antenna to be tested, the spherical center of the hemispherical surface and the fixing base are in a normal direction of the bottom plate The projections overlap.

Preferably, the mirror is a plane mirror.

Preferably, the movable arm further includes a rotating member, a first arm portion and a second arm portion. The rotating member has a rotating end and a joint, the rotating end is sleeved on the fixing base, the rotating member has a function of rotating from 0 to 360 degrees relative to the fixing base, and the axis of the rotating member and The spherical centers of the hemispherical surfaces are co-located in the normal direction of the bottom plate. The first arm has a first joint, a second joint, and an arm connecting the first joint and the second joint, and the first joint of the first arm is connected to the joint of the rotating member So that the first arm can rotate relative to the rotating member. The second arm has a first joint, a second joint, and an arm connecting the first joint and the second joint, and the first joint of the second arm and the first arm The two joints are connected so that the second arm can rotate relative to the first arm, and the clip arm is connected to the second joint of the second arm so that the clip arm can be opposed to the second arm部转。 Rotate.

Preferably, the control and measurement unit includes a radio frequency signal generator, a signal feeding fixture, a spectrum analyzer and a computer. The radio frequency signal generator outputs a radio frequency output signal of a preset size. The signal feeding fixture is electrically connected to the RF signal generator to receive the RF output signal, and has a probe and a camera lens, the camera lens is disposed toward the probe to assist in observing the image of the probe. Touch the antenna under test to transmit the RF output signal to the antenna under test, the antenna under test receives the RF output signal and converts it to the electromagnetic wave emission, and the electromagnetic wave reflected by the reflector reflects to the highly directional antenna , The electromagnetic wave received by the highly directional antenna is converted into a radio frequency reception signal. The spectrum analyzer is electrically connected to the high directivity antenna to receive the radio frequency reception signal, and measures the amplitude of the radio frequency reception signal. The computer is electrically connected to the spectrum analyzer to obtain the amplitude of the RF received signal, and according to the amplitude of the RF received signal, the radiation gain of the highly directional antenna, the radius of the hemispherical surface, the highly directional antenna to the reflector The linear distance between them, and the path loss of the signal fed into the fixture, together calculate the radiation gain of the antenna under test when the mirror is at the measurement point, and use the spatial information of the location of the measurement point and the The radiation gain constructs the hemispherical radiation pattern of the antenna to be tested.

Preferably, the control and measurement unit includes a radio frequency signal generator, a signal feeding fixture, a spectrum analyzer and a computer. The radio frequency signal generator outputs a radio frequency output signal of a predetermined size, the highly directional antenna is electrically connected to the radio frequency signal generator to receive the radio frequency output signal and converts the electromagnetic wave to the mirror, and the mirror reflects the electromagnetic wave To the antenna under test, the antenna under test receives the electromagnetic wave and converts it into a radio frequency reception signal. The signal feeding fixture has a probe and a camera lens. The camera lens is disposed toward the probe to assist in observing the probe image. The probe is used to touch the antenna to be tested to receive the radio frequency reception signal. The spectrum analyzer is electrically connected to the signal feeding fixture to receive the radio frequency reception signal, and measures the amplitude of the radio frequency reception signal. The computer is electrically connected to the spectrum analyzer to obtain the amplitude of the RF received signal, and according to the amplitude of the RF received signal, the radiation gain of the highly directional antenna, the radius of the hemispherical surface, the highly directional antenna to the reflector The linear distance between them, and the path loss of the signal fed into the fixture, together calculate the radiation gain of the antenna under test when the mirror is at the measurement point, and use the spatial information of the location of the measurement point and the The radiation gain constructs the hemispherical radiation pattern of the antenna to be tested.

The effect of the present invention is to use the robot arm unit for automatic radiation gain measurement, and use the computer to construct a hemispherical radiation field pattern, so the shortcomings described in the prior art can be solved.

11‧‧‧Electronic darkroom

12‧‧‧High directional antenna

13‧‧‧rotating base

14‧‧‧ antenna under test

2‧‧‧ antenna under test

21‧‧‧Main radiating surface

3‧‧‧Electronic wave darkroom

4‧‧‧High directional antenna

5‧‧‧Robot arm unit

6‧‧‧Control and measurement unit

31‧‧‧Top board

311‧‧‧ opening

32‧‧‧Bottom plate

33‧‧‧Side board

34‧‧‧window

35‧‧‧Electromagnetic wave absorber

4‧‧‧High directional antenna

5‧‧‧Robot arm unit

50‧‧‧Fixed seat

51‧‧‧movable arm

52‧‧‧rotating parts

521‧‧‧rotating end

522‧‧‧joint

53‧‧‧ First arm

531‧‧‧The first joint

532‧‧‧Second Joint

533‧‧‧arm

54‧‧‧Second arm

541‧‧‧The first joint

542‧‧‧Second Joint

543‧‧‧arm

55‧‧‧Clamp arm

551‧‧‧The first end

552‧‧‧Second end

6‧‧‧Control and measurement unit

61‧‧‧RF signal generator

62‧‧‧Signal feeding fixture

621‧‧‧probe

622‧‧‧Camera lens

63‧‧‧ Spectrum Analyzer

64‧‧‧Computer

7‧‧‧Reflecting mirror

R‧‧‧ Hemisphere radius

Figure 1 is a schematic diagram illustrating a prior art antenna measurement system.

FIG. 2 is a schematic diagram illustrating the first preferred embodiment of the automatic measurement system of the antenna radiation field type of the present invention.

Figure 3 is a more detailed schematic diagram of the first preferred embodiment, illustrating an implementation of the control and measurement unit.

Figure 4 is another more detailed schematic diagram of the first preferred embodiment, illustrating another implementation of the control and measurement unit.

Fig. 5 is a schematic diagram of the second preferred embodiment.

Fig. 6 is another schematic diagram of the second preferred embodiment.

Referring to FIG. 2, an antenna radiation field type automatic measurement system of the present invention is suitable for measuring a hemispherical radiation field pattern of an antenna 2 to be tested. The antenna 2 to be tested includes a main radiation surface 21, the first preferred embodiment It includes an anechoic chamber 3, a highly directional antenna 4, a robot arm unit 5 and a control and measurement unit 6.

The appearance of the anechoic chamber 3 is generally a hollow rectangular parallelepiped, which includes a top plate 31, a bottom plate 32 opposite to the top plate 31, four side plates 33 connecting the top plate 31 and the bottom plate 32, and a window 34.

A plurality of electromagnetic wave absorbers 35 are attached to the top plate 31, the side plates 33 and the bottom plate 32, and the top plate 31 has an opening 311 which is approximately located at the geometric center of the top plate 31.

The inner surface of the window 34 is used to attach the antenna 2 to be tested. When the window 34 is opened, the inner and outer spaces of the radio wave darkroom 3 communicate through the opening 311, and when the window 34 is closed, the opening 311 of the top plate 31 is The window 34 is covered. At this time, the antenna 2 to be tested is disposed close to the top plate 31, and the main radiation surface 21 is the bottom plate 32 facing the anechoic chamber 3.

The radiation pattern of the highly directional antenna 4 has a main beam. The highly directional antenna 4 may be a waveguide antenna, a leaky wave antenna, a horn antenna, and an array antenna (array antenna), or other antenna types with high directivity characteristics.

The robot arm unit 5 is disposed in the anechoic chamber 3 and includes a fixed base 50 and a movable arm 51.

The fixing seat 50 is disposed at the geometric center of the bottom plate 32 of the radio wave anechoic chamber 3.

The movable arm 51 extends from the fixing base 50 and has a rotating member 52, a first arm portion 53, a second arm portion 54 and an object-holding arm portion 55.

The rotating member 52 has a rotating end 521 and a joint 522. The rotating end 521 is sleeved on the fixing base 50. The rotating member 52 has a function of rotating from 0 to 360 degrees relative to the fixing base 50.

The first arm 53 has a first joint 531, a second joint 532, and an arm 533 connecting the first joint 531 and the second joint 532, and the first joint 531 of the first arm 53 The joint 522 of the rotating member 52 is connected so that the first arm portion 53 can rotate relative to the rotating member 52.

The second arm 54 has a first joint 541, a second joint 542, and an arm 543 connecting the first joint 541 and the second joint 532, and the first joint 541 of the second arm 54 The second joint 532 of the first arm 53 is connected so that the second arm 54 can rotate relative to the first arm 53.

The clip arm portion 55 is connected to the second joint 542 of the second arm portion 54 so that the clip arm portion 55 can rotate relative to the second arm portion 54. The highly directional antenna 4 is provided on the gripping arm portion 55 and is interlocked by the movable arm 51.

The control and measurement unit 6 is electrically connected to the antenna 2 to be tested, the highly directional antenna 4 and the robot arm unit 5, and controls the robot arm unit 5 to link the highly directional antenna 4 in a plurality of preset measurements Move between points.

The preset measurement points are all located on a hemispherical surface of a preset radius. When the high directional antenna 4 moves to each preset measurement point, the control and measurement unit 6 passes through the to-be-measured The antenna 2 and the highly directional antenna 4 respectively send and receive an electromagnetic wave to measure a radiation gain of the antenna 2 to be tested. The control and measurement unit 6 is also constructed using the radiation gains of the plurality of measurement points corresponding to the measurement points The half-spherical radiation pattern of the antenna 2 to be tested, wherein, when the high directivity antenna 4 stays at the measurement point, the robot arm unit 5 will also rotate the angle of the high directivity antenna 4 to make the high directivity The main beam of the antenna 4 is directed to the spherical center of the hemispherical surface (the spherical center of the hemispherical surface is also a geometric center of the radiating surface 21), and a circular opening defined by the hemispherical surface is directed to the radio wave anechoic chamber 3 The top plate 31 and the antenna 2 to be tested, and the antenna 2 to be tested, the spherical center of the hemispherical surface, the axis of the rotating member 52 and a normal direction (Z direction) of the fixing base 50 to the bottom plate 32 The projections on the overlap.

Referring to FIG. 3, FIG. 3 is for explaining an embodiment of the control and measurement unit 6 when the antenna 2 to be tested is used as a transmitting antenna and the highly directional antenna 4 is used as a receiving antenna.

The control and measurement unit 6 includes a radio frequency signal generator 61, a signal feed fixture 62, a spectrum analyzer 63 and a computer 64.

The radio frequency signal generator 61 outputs a radio frequency output signal of a preset size.

The signal feeding fixture 62 is electrically connected to the RF signal generator 61 to receive the RF output signal, and has a probe 621 and a camera lens 622, and the camera lens 622 is disposed toward the probe 621 to assist in observing the probe 621 Image, the probe 621 is used to touch the antenna under test 2 to transmit the RF output signal to the antenna under test 2, the antenna under test 2 receives the RF output signal and converts it into the electromagnetic wave, the high directivity The antenna 4 receives the electromagnetic wave and converts it into a radio frequency reception signal.

The spectrum analyzer 63 is electrically connected to the high directivity antenna 4 to receive the radio frequency reception signal, and measures the amplitude of the radio frequency reception signal. In practical applications, the spectrum analyzer 63 can also be replaced with a network analyzer.

The computer 64 is electrically connected to the spectrum analyzer 63 to receive the amplitude of the RF received signal, and feeds into the fixture according to the amplitude of the RF received signal, the radiation gain of the highly directional antenna 4, the radius R of the hemisphere, and the signal The path loss of 62 (insertion loss) jointly calculates the radiation gain of the antenna under test 2 when the highly directional antenna 4 is located at the measurement point, and is constructed using the spatial information of the location of the measurement point and the radiation gain The hemispherical radiation pattern of the antenna 2 to be tested.

Referring to FIG. 4, FIG. 4 is for explaining another embodiment of the control and measurement unit 6 when the highly directional antenna 4 is used as a transmitting antenna and the antenna under test 2 is used as a receiving antenna.

The radio frequency signal generator 61 outputs a radio frequency output signal of a preset size.

The highly directional antenna 4 is electrically connected to the radio frequency signal generator 61 to receive the radio frequency output signal and convert it into the electromagnetic wave, and the antenna under test 2 receives the electromagnetic wave and converts it into a radio frequency reception signal.

The signal feeding fixture 62 includes a probe 621 and a camera lens 622. The camera lens 622 is disposed toward the probe 621 to assist in observing the image of the probe 621. The probe 621 is used to touch the antenna 2 to be tested to receive the RF reception signal.

The spectrum analyzer 63 is electrically connected to the signal feeding fixture 62 to receive the RF reception signal, and measures the amplitude of the RF reception signal.

The computer 64 is electrically connected to the spectrum analyzer 63 to obtain the amplitude of the RF received signal, and according to the amplitude of the RF received signal, the radiation gain of the highly directional antenna 4, the radius R of the hemisphere and the signal feeding fixture The path loss of 62 jointly calculates the radiation gain of the antenna under test 2 when the highly directional antenna 4 is located at the measurement point, and constructs the antenna under test 2 using the spatial information of the location of the measurement point and the radiation gain Radiation pattern of the hemisphere.

5 is a second preferred embodiment of the present invention, which is similar to the first preferred embodiment (see FIG. 2), the difference is that the first preferred embodiment supports far-field or near-field measurement methods, the first The second preferred embodiment further supports the measurement method of the reduced-distance field, so the second preferred embodiment further includes a reflecting mirror 7. The parts of this preferred embodiment that are similar to the first preferred embodiment will not be repeated, and the differences will be described as follows.

The clamp arm 55 has a first end 551 and a second end 552, the reflector 7 is disposed at the first end 551 of the clamp arm 55, and the highly directional antenna 4 is disposed at the clamp arm The second end 552 of 55.

In the preferred embodiment, the reflecting mirror 7 is a plane mirror, the main beam of the radiation pattern of the highly directional antenna 4 is directed to the reflecting mirror 7, when the antenna under test 2 is used as a transmitting antenna and the highly directional antenna 4 As a receiving antenna, the electromagnetic wave emitted by the antenna under test 2 propagates to the mirror 7 and is reflected by the mirror 7 to the highly directional antenna 4; conversely, when the highly directional antenna 4 is used as a transmitting antenna When the antenna 2 under test is used as a receiving antenna, the electromagnetic wave emitted by the high directivity antenna 4 propagates to the mirror 7 and then is reflected by the mirror 7 to the antenna 2 under test for reception. Compared with the first preferred embodiment, the space requirement of the anechoic chamber 3 of the second preferred embodiment is smaller (shrinkage field measurement), because the antenna 2 to be tested in the first preferred embodiment is The highly directional antenna 4 transmits and receives the electromagnetic wave in a line-of-sight manner, but the second preferred embodiment uses the reflection mode of the reflecting mirror 7 to transmit and receive the electromagnetic wave, which is equivalent to extending the propagation distance.

The control and measurement unit 6 controls the robot arm unit 5 to move the mirror 7 to move between a plurality of predetermined measurement points, and the measurement points are located on a hemispherical surface of a predetermined radius. When the reflecting mirror 7 moves to each preset measuring point, the control and measuring unit 6 sends and receives an electromagnetic wave (the electromagnetic wave passes through the reflecting mirror 7 on the way) through the antenna 2 to be tested and the highly directional antenna 4 respectively To measure a radiation gain of the antenna 2 to be tested, the control and measurement unit 6 also uses the plurality of radiation gains corresponding to the measurement points to construct a half-spherical radiation pattern of the antenna 2 to be tested.

When the antenna under test 2 is used as a transmitting antenna and the highly directional antenna 4 is used as a receiving antenna, the antenna under test 2 receives the radio frequency output signal and converts it into an electromagnetic wave emission, and the reflecting mirror 7 reflects part of the electromagnetic wave to the high A directional antenna 4, the high directional antenna 4 receives part of the electromagnetic wave and converts it into a radio frequency reception signal, the spectrum analyzer 63 is electrically connected to the high directional antenna 4 to receive the radio frequency reception signal, and measure the radio frequency reception signal The amplitude. The computer 64 is electrically connected to the spectrum analyzer 63 to receive the amplitude of the radio frequency received signal, and according to the amplitude of the radio frequency received signal, the radiation gain of the highly directional antenna 4, the radius R of the hemisphere, the highly directional antenna The linear distance L between the reflector 7 and the reflector 7 and the path loss of the signal feeding fixture 62 jointly calculate the radiation gain of the antenna 2 to be tested when the reflector 7 is located at the measurement point, and use the same amount The spatial information of the location of the measuring point and the radiation gains constitute the hemispherical radiation pattern of the antenna 2 to be measured.

Referring to FIG. 6, when the highly directional antenna 4 is used as a transmitting antenna and the antenna under test 2 is used as a receiving antenna, the highly directional antenna 4 is electrically connected to the RF signal generator 61 to receive an RF output signal and convert it into the electromagnetic wave It is emitted toward the reflecting mirror 7, the reflecting mirror 7 reflects the electromagnetic wave to the antenna under test 2, and the antenna under test 2 receives the electromagnetic wave and converts it into a radio frequency receiving signal. The probe 621 is used to touch the antenna 2 to be tested to receive the RF reception signal. The spectrum analyzer 63 is electrically connected to the signal feeding fixture 62 to receive the RF reception signal, and measures the amplitude of the RF reception signal. The computer 64 is electrically connected to the spectrum analyzer 63 to obtain the amplitude of the RF received signal, and according to the amplitude of the RF received signal, the radiation gain of the highly directional antenna 4, the radius of the hemispherical surface, the highly directional antenna 4 The straight-line distance to the reflector 7 and the path loss of the signal feeding fixture 62 jointly calculate the radiation gain of the antenna 2 to be tested when the reflector 7 is located at the measurement point, and use the measurement points The spatial information of the location and the radiation gains constitute the hemispherical radiation pattern of the antenna 2 to be tested.

The calculation method of the radiation gain of the antenna 2 to be tested is supplemented as follows.

Because the power P1 of the RF output signal output by the RF signal generator 61 is known, and the highly directional antenna 4 is also a known antenna (gain is known), it can be calculated that the highly directional antenna 4 receives the RF output The power P2 of the electromagnetic wave radiated after the signal, the path distance traveled by the electromagnetic wave is L+R, and the environment is air, so the power P3 when the electromagnetic wave reaches the antenna under test 2 can be calculated, and the spectrum analyzer 63 is connected to The power P4 of the RF received signal can be measured, where the difference between the power P4 and the power P3 is caused by both the gain of the antenna under test 2 and the insertion loss of the signal feeding fixture 62, and the path loss It is also known (can be measured by tools such as a network analyzer), so the path loss can be compensated, so the radiation gain G of the antenna 2 to be tested is finally calculated. R: the radius of the hemisphere, L: the linear distance between the highly directional antenna 4 and the mirror 7.

In addition, since the rotating member 52 has a function of rotating from 0 degrees to 360 degrees ( ψ =0 ⁰ to 360 ⁰ ), and the first arm portion 53, the second arm portion 54 and the clip arm portion 55 can be mutually Relative rotation ( θ =-90 ⁰ ~+90 ⁰ ), so the spatial position of each measurement point can be expressed by ( ψ , θ ). If the radiation gain G of the antenna 2 to be measured is added, the computer 64 The data ( ψ , θ , G ) can construct the hemispherical radiation pattern of the antenna 2 to be tested.

In summary, the above-mentioned preferred embodiment has the following advantages: the robot arm unit 5 is used to perform automatic radiation gain measurement on the antenna 2 to be tested, and the computer 64 is used to construct the hemispherical radiation of the antenna 2 to be tested Field pattern, and then solve the shortcomings of the prior art.

However, the above are only examples of the present invention, and should not be used to limit the scope of implementation of the present invention, any simple equivalent changes and modifications made in accordance with the scope of the patent application of the present invention and the content of the patent specification still belong to This invention covers the patent.

2‧‧‧ antenna under test

21‧‧‧Main radiating surface

3‧‧‧Electronic wave darkroom

31‧‧‧Top board

311‧‧‧ opening

32‧‧‧Bottom plate

33‧‧‧Side board

34‧‧‧window

35‧‧‧Electromagnetic wave absorber

4‧‧‧High directional antenna

5‧‧‧Robot arm unit

50‧‧‧Fixed seat

51‧‧‧movable arm

52‧‧‧rotating parts

521‧‧‧rotating end

522‧‧‧joint

53‧‧‧ First arm

531‧‧‧The first joint

532‧‧‧Second Joint

533‧‧‧arm

54‧‧‧Second arm

541‧‧‧The first joint

542‧‧‧Second Joint

543‧‧‧arm

55‧‧‧Clamp arm

6‧‧‧Control and measurement unit

Claims (10)

An antenna radiation field type automatic measurement system is suitable for measuring the hemispherical radiation field type of an antenna to be tested. The antenna to be tested includes a main radiation surface. The system includes: an electric wave anechoic chamber, including a top plate, and A bottom plate of the top plate, the antenna under test is arranged close to the top plate, and the main radiating surface of the antenna under test is set toward the bottom plate; a highly directional antenna; a robot arm unit, which is set in the radio wave dark room, and includes a A fixed base and a movable arm are provided on the bottom plate of the radio wave anechoic chamber. The movable arm extends from the fixed base and has a clamping arm part, and the highly directional antenna is arranged on the clamping arm part and Linked by the movable arm; and a control and measurement unit electrically connecting the antenna to be tested, the high directivity antenna and the robot arm unit, and controlling the robot arm unit to link the high directivity antenna in multiple preset Move between measurement points, and the preset measurement points are all located on a hemispherical surface with a preset radius. When the highly directional antenna moves to each preset measurement point, the control and measurement The unit transmits and receives an electromagnetic wave through the antenna under test and the highly directional antenna to measure a radiation gain of the antenna under test. The control and measurement unit also utilizes the plurality of radiation gains corresponding to the measurement points respectively A semi-spherical radiation pattern of the antenna to be tested is constructed, and a circular opening defined by the hemisphere is toward the top plate of the anechoic chamber and the antenna to be tested, and the antenna to be tested and the hemispherical sphere The projections of the center and the fixing base in a normal direction of the base plate overlap. According to the automatic measurement system of antenna radiation field type 1 in the patent application scope, wherein the top plate of the anechoic chamber has an opening, the anechoic chamber also includes a window, the inner surface of the window is used to attach the antenna to be tested, when the When the window is opened, the inner and outer spaces of the anechoic chamber communicate with each other through the opening, and when the window is closed, the opening of the top plate is covered by the window, and the main radiation surface of the antenna to be tested is toward the bottom plate of the anechoic chamber. According to the automatic measurement system of antenna radiation field type 1 in the patent application scope, wherein the movable arm further includes: a rotating member having a rotating end and a joint, the rotating end is sleeved on the fixing base, and the rotating The member has a function of rotating from 0 to 360 degrees relative to the fixed base, and the axis of the rotating member and the center of the hemispherical surface are located in the normal direction of the bottom plate; a first arm portion has a first A joint, a second joint, and an arm connecting the first joint and the second joint, and the first joint of the first arm is connected to the joint of the rotating member, so that the first arm can Rotate relative to the rotating member; and a second arm having a first joint, a second joint, and an arm connecting the first joint and the second joint, and the first joint of the second arm Connected to the second joint of the first arm, so that the second arm can rotate relative to the first arm, the arm of the clip is connected to the second joint of the second arm, so that the clip The arm can rotate relative to the second arm. The automatic measurement system of the antenna radiation field type according to item 1 of the patent application scope, wherein the control and measurement unit includes: a radio frequency signal generator, which outputs a radio frequency output signal of a preset size; a signal feeding fixture, and electrical connection The radio frequency signal generator receives the radio frequency output signal, and has a probe and a camera lens, the camera lens is disposed toward the probe to assist in observing the image of the probe, and the probe is used to touch the antenna under test To transmit the radio frequency output signal to the antenna under test, the antenna under test receives the radio frequency output signal and converts it into the electromagnetic wave, the highly directional antenna receives the electromagnetic wave and converts it into a radio frequency received signal; a spectrum analyzer, electrically connected The highly directional antenna receives the radio frequency received signal and measures the amplitude of the radio frequency received signal; and a computer is electrically connected to the spectrum analyzer to obtain the amplitude of the radio frequency received signal, and according to the amplitude of the radio frequency received signal, The radiation gain of the highly directional antenna, the radius of the hemisphere and the path loss of the signal feeding fixture together calculate the radiation gain of the antenna to be tested when the highly directional antenna is located at the measurement point, and construct the antenna to be tested Radiation pattern of the hemisphere. The automatic measurement system of the antenna radiation field type according to item 1 of the patent application scope, wherein the control and measurement unit includes: a radio frequency signal generator that outputs a radio frequency output signal of a predetermined size, and the highly directional antenna is electrically connected to the The radio frequency signal generator receives the radio frequency output signal and converts it into the electromagnetic wave, and the antenna under test receives the electromagnetic wave and converts it into a radio frequency receiving signal; a signal feeding fixture has a probe and a camera lens, and the camera lens faces the The probe is set to assist in observing the image of the probe. The probe is used to touch the antenna to be tested to receive the RF receiving signal; a spectrum analyzer is electrically connected to the signal feeding fixture to receive the RF receiving signal and measure Measuring the amplitude of the RF received signal; and a computer, electrically connected to the spectrum analyzer to obtain the amplitude of the RF received signal, and according to the amplitude of the RF received signal, the radiation gain of the highly directional antenna, the radius of the hemisphere Together with the path loss of the signal feeding fixture, the radiation gain of the antenna under test when the highly directional antenna is located at the measurement point is calculated, and the hemispherical radiation pattern of the antenna under test is constructed. An antenna radiation field type automatic measurement system is suitable for measuring the hemispherical radiation field type of an antenna to be tested. The antenna to be tested includes a main radiation surface. The system includes: an electric wave anechoic chamber, including a top plate, and A bottom plate of the top plate, the antenna under test is disposed close to the top plate, and the main radiating surface of the antenna under test is set toward the bottom plate; a reflector; a highly directional antenna, including a main radiating surface, the highly directional antenna A main beam of the radiation field type is directed to the mirror, and an electromagnetic wave transmitted and received between the highly directional antenna and the antenna under test is incident on the mirror and is reflected; a robot arm unit is provided in the radio wave dark room And includes a fixed seat and a movable arm, the fixed seat is disposed on the bottom plate of the anechoic chamber, the movable arm extends from the fixed seat and has a clamp arm portion, the clamp arm portion has a first end And a second end, the reflecting mirror is arranged at the first end of the clamp arm, the high directivity antenna is arranged at the second end of the clamp arm; and a control and measurement unit is electrically connected to the A measuring antenna, the highly directional antenna and the robot arm unit, and control the robot arm unit to move the mirror to move between a plurality of preset measurement points, and the measurement points are all located at a preset radius On the hemispherical surface, when the mirror moves to each preset measurement point, the control and measurement unit transmits and receives the electromagnetic wave to measure the antenna under test through the antenna under test and the highly directional antenna respectively A radiation gain, the control and measurement unit also uses the plurality of radiation gains corresponding to the measurement points to construct a semi-spherical radiation pattern of the antenna under test, and a circle defined by the hemisphere The opening is toward the top plate of the anechoic chamber and the antenna to be tested, and the projections of the antenna to be tested, the spherical center of the hemispherical surface and the fixing base in a normal direction of the bottom plate overlap. According to item 6 of the patent application scope of the antenna radiation field type automatic measurement system, the reflector is a plane mirror. According to the antenna radiation field type automatic measurement system of claim 6 of the patent application scope, wherein the movable arm further includes: a rotating member having a rotating end and a joint, the rotating end is sleeved on the fixing base, the rotating The member has a function of rotating from 0 to 360 degrees relative to the fixed base, and the axis of the rotating member and the center of the hemispherical surface are located in the normal direction of the bottom plate; a first arm portion has a first A joint, a second joint, and an arm connecting the first joint and the second joint, and the first joint of the first arm is connected to the joint of the rotating member, so that the first arm can Rotate relative to the rotating member; and a second arm having a first joint, a second joint, and an arm connecting the first joint and the second joint, and the first joint of the second arm Connected to the second joint of the first arm, so that the second arm can rotate relative to the first arm, the arm of the clip is connected to the second joint of the second arm, so that the clip The arm can rotate relative to the second arm. The automatic measurement system of antenna radiation field type according to item 6 of the patent application scope, wherein the control and measurement unit includes: a radio frequency signal generator that outputs a radio frequency output signal of a preset size; a signal feeding fixture, electrically connected The radio frequency signal generator receives the radio frequency output signal, and has a probe and a camera lens, the camera lens is disposed toward the probe to assist in observing the image of the probe, and the probe is used to touch the antenna under test To transmit the RF output signal to the antenna under test, the antenna under test receives the RF output signal and converts it to the electromagnetic wave emission, the electromagnetic wave reflected by the mirror part to the highly directional antenna, the highly directional antenna receives Part of the electromagnetic wave is converted into a radio frequency reception signal; a spectrum analyzer, which is electrically connected to the high directivity antenna to receive the radio frequency reception signal, and measures the amplitude of the radio frequency reception signal; and a computer, which is electrically connected to the spectrum analyzer To obtain the amplitude of the RF received signal, and according to the amplitude of the RF received signal, the radiation gain of the highly directional antenna, the radius of the hemisphere, the linear distance between the highly directional antenna and the reflector, and the The path loss of the signal feeding into the fixture, together calculate the radiation gain of the antenna under test when the mirror is at the measurement point, and use the spatial information of the location of the measurement point and the radiation gain to construct the antenna of the antenna under test Hemispherical radiation pattern. According to the antenna measurement field type 6 automatic measurement system of the patent application scope, wherein the control and measurement unit includes: a radio frequency signal generator, which outputs a radio frequency output signal of a preset size, and the highly directional antenna is electrically connected to the The radio frequency signal generator receives the radio frequency output signal and converts the electromagnetic wave to the mirror, and the mirror reflects the electromagnetic wave to the antenna under test. The antenna under test receives the electromagnetic wave and converts it into a radio frequency receiving signal; a signal feed Into the fixture, there is a probe and a camera lens, the camera lens is arranged towards the probe to assist in observing the probe image, the probe is used to touch the antenna to be tested to receive the RF receiving signal; a spectrum analyzer , Electrically connecting the signal feeding fixture to receive the radio frequency receiving signal and measuring the amplitude of the radio frequency receiving signal; and a computer, electrically connecting the spectrum analyzer to obtain the amplitude of the radio frequency receiving signal, and receiving the signal according to the radio frequency Amplitude, the radiation gain of the highly directional antenna, the radius of the hemispherical surface, the linear distance between the highly directional antenna and the reflector, and the path loss of the signal fed into the fixture, together calculating the reflector is located in the When measuring points, the radiation gain of the antenna to be measured is used, and the spatial information of the locations of the measurement points and the radiation gains are used to construct the hemispherical radiation pattern of the antenna to be measured.

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