TWI676035B - An automatic measurement system for antenna radiation pattern - Google Patents

Abstract

An antenna radiation field type automatic measurement system includes an anechoic chamber, a highly directional antenna, a robot arm unit, and a control and measurement unit. The robot arm unit is disposed in the anechoic chamber and moves the high-directional antenna to move between a plurality of preset measurement points, and the preset measurement points are all located on a hemisphere with a preset radius. The control and measurement unit uses the high-directional antenna to measure a radiation gain of an antenna under test, and uses a plurality of radiation gains to construct a hemispherical radiation field pattern of the antenna under test.

Description

Antenna radiation field type automatic measurement system

The invention relates to a measurement system, in particular to a system that can automatically measure the hemispherical radiation field type of an antenna.

Referring to FIG. 1, in the prior art antenna measurement system, a high directivity antenna 12 and a rotating base 13 are installed in an anechoic chamber 11, and then an antenna under test 14 is placed on the rotating base 13, and 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 a rotation of ± 90 degrees around the X axis. The high directivity antenna 12 and the antenna under test 14 are used to receive and transmit an electromagnetic wave, respectively, and the antenna 13 under test is rotated 360 degrees around the Z axis through the rotation base 13 to measure the XY plane. Two-dimensional radiation field type.

The disadvantage of this prior art is that the placement of the highly directional antenna 12 and the antenna under test 14 need to be manually adjusted each time (the rotation base 13 is rotated once around the Z axis 360 degrees and is called once) Only a two-dimensional plane radiation field pattern can be obtained. To construct a three-dimensional radiation field pattern using N two-dimensional plane radiation field patterns, you must manually manually adjust the radiation of the antenna 14 under test N times. The tilt angle is not only inaccurate but also 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 development.

The antenna radiation field type automatic measurement system of the present invention is suitable for measuring a hemispherical radiation field type of an antenna under test. The antenna under test includes a main radiating surface. The first preferred embodiment includes an anechoic chamber, 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 opposite 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 anechoic chamber and includes a fixed base and a movable arm. The fixed base is disposed on the bottom plate of the anechoic chamber. The movable arm extends from the fixed base and has a clamp arm portion. The high directional antenna is disposed on the clamp arm and is linked by the movable arm.

The control and measurement unit is electrically connected to the antenna under test, the high directivity antenna, and the robot arm unit, and controls the robot arm unit to move the high directivity antenna to move between a plurality of preset measurement points, and The preset measurement points are all located on a hemisphere with a preset radius. When the highly directional antenna moves to each preset measurement point, the control and measurement unit passes the antenna to be tested and The highly directional antenna sends and receives an electromagnetic wave to measure the day to be measured A radiation gain of the line, the control and measurement unit also uses the plurality of radiation gains corresponding to the measurement points to construct a hemispherical radiation field pattern of the antenna under test, and a The circular opening faces the top plate of the anechoic chamber and the antenna under test, and the projection of the antenna under test, the spherical center of the hemispherical surface, and a normal direction of the base plate 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 to be tested. When the window is opened, the inner and outer spaces of the anechoic chamber communicate through the opening. 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 fixed seat, the rotating member has a function of rotating 0 to 360 degrees with respect to the fixed seat, and an axis line of the rotating member and The spherical centers of the hemispheres are 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 portion can rotate relative to the rotating member. The second arm portion has a first joint, a second joint, and an arm rod connecting the first joint and the second joint, and the first joint of the second arm portion and the first joint of the first arm portion The two joints are connected so that the second arm portion can be rotated relative to the first arm portion, and the clamped arm portion is connected with the second joint of the second arm portion so that the clamped arm portion can be connected with each other. The second arm is rotated.

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 radio frequency signal generator to receive 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. Touching 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, and the highly directional antenna receives the electromagnetic wave and converts it into a radio frequency receiving signal. The spectrum analyzer is electrically connected to the highly directional antenna to receive the RF receiving signal, and measures the amplitude of the RF receiving signal. The computer is electrically connected to the spectrum analyzer to obtain the amplitude of the RF receiving signal, and based on the amplitude of the RF receiving signal, the radiation gain of the highly directional antenna, the radius of the hemispherical surface, and the path loss of the signal feeding fixture Calculate the radiation gain of the antenna under test when the highly directional antenna is located at the measurement point, and construct a hemispherical radiation field 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 preset 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. 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 The probe is arranged towards the probe to assist in observing the probe image, and the probe is used to touch the antenna under test to receive the radio frequency receiving signal. The spectrum analyzer is electrically connected to the signal feeding fixture to receive the RF receiving signal, and measures the amplitude of the RF receiving signal. The computer is electrically connected to the spectrum analyzer to obtain the amplitude of the RF receiving signal, and based on the amplitude of the RF receiving signal, the radiation gain of the highly directional antenna, the radius of the hemispherical surface, and the path loss of the signal feeding fixture Calculate the radiation gain of the antenna under test when the highly directional antenna is located at the measurement point, and construct a hemispherical radiation field pattern of the antenna under test.

The antenna radiation field type automatic measurement system of the present invention is suitable for measuring a hemispherical radiation field type of an antenna under test. The antenna under test includes a main radiating surface. The second preferred embodiment includes an anechoic chamber and a reflector. , A high-directional antenna, a robot arm unit, and a control and measurement unit.

The anechoic chamber includes a top plate and a bottom plate opposite 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 high-directional antenna includes a main radiating surface. A main beam of a radiation field type of the high-directional antenna is directed to the reflector. An electromagnetic wave transmitted and received between the high-directional antenna and the antenna under test is incident on the reflection. Mirror and is reflected.

The robot arm unit is disposed in the anechoic chamber and includes a fixed base and a movable arm. The fixed base is disposed on the bottom plate of the anechoic chamber. The movable arm extends from the fixed base and has a clamp arm portion. The clamp arm The part has a first end and a second end, the reflector is disposed on the first end of the clamp arm portion, and the high directional antenna is disposed on the second end of the clamp arm portion.

The control and measurement unit is electrically connected to the antenna under test, the high directivity antenna, and the robot arm unit, and controls the robot arm unit to move the reflector to move between a plurality of preset measurement points, and The measurement points are located on a hemisphere with a preset radius. When the reflector moves to each preset measurement point, the control and measurement unit transmits and receives through the antenna under test and the high-directional antenna. The electromagnetic wave measures a radiation gain of the antenna under test, and the control and measurement unit also uses the plurality of radiation gains corresponding to the measurement points to construct a hemispherical radiation field pattern of the antenna under test, and, A circular opening defined by the hemispherical surface faces 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 fixed seat are in a normal direction of the bottom plate. The projections overlap.

Preferably, the reflecting 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 fixed seat, the rotating member has a function of rotating 0 to 360 degrees with respect to the fixed seat, and an axis line of the rotating member and The spherical centers of the hemispheres are 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 portion can rotate relative to the rotating member. The second 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 second arm portion is connected to the second joint of the first arm portion, so that the first The two arm portions can rotate relative to the first arm portion, and the object holding arm portion is connected to the second joint of the second arm portion, so that the object holding arm portion can rotate relative to the second arm portion.

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 radio frequency signal generator to receive 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. 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 emission, and the electromagnetic wave reflected by the reflecting part of the mirror to the high directivity antenna The electromagnetic wave of the high-directional antenna receiving part is converted into a radio frequency receiving signal. The spectrum analyzer is electrically connected to the highly directional antenna to receive the RF receiving signal, and measures the amplitude of the RF receiving signal. The computer is electrically connected to the spectrum analyzer to obtain the amplitude of the RF receiving signal, and according to the amplitude of the RF receiving signal, the radiation gain of the highly directional antenna, the radius of the hemispherical surface, and the highly directional antenna to the mirror The straight-line distance between them, and the path loss of the signal feeding fixture, jointly calculate the radiation gain of the antenna under test when the reflector is located at the measurement point, and use the spatial information of the locations of the measurement points and the Radiation gain constructs the hemispherical radiation field of the antenna under test type.

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 high-directional antenna is electrically connected to the radio frequency signal generator to receive the radio frequency output signal and is converted into the electromagnetic wave to be emitted toward the reflector. The reflector 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. The signal feeding fixture has a probe and a camera lens. The camera lens is disposed toward the probe to assist in observing the image of the probe. The probe is used to touch the antenna under test to receive the radio frequency receiving signal. The spectrum analyzer is electrically connected to the signal feeding fixture to receive the RF receiving signal, and measures the amplitude of the RF receiving signal. The computer is electrically connected to the spectrum analyzer to obtain the amplitude of the RF receiving signal, and according to the amplitude of the RF receiving signal, the radiation gain of the highly directional antenna, the radius of the hemispherical surface, and the highly directional antenna to the mirror The straight-line distance between them, and the path loss of the signal feeding fixture, jointly calculate the radiation gain of the antenna under test when the reflector is located at the measurement point, and use the spatial information of the locations of the measurement points and the The radiation gain constructs the hemispherical radiation field pattern of the antenna under test.

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

11‧‧‧ Anechoic Chamber

12‧‧‧High Directivity Antenna

13‧‧‧Swivel base

14‧‧‧Antenna to be tested

2‧‧‧Antenna to be tested

21‧‧‧ main radiation surface

3‧‧‧ Anechoic Chamber

4‧‧‧ high directivity antenna

5‧‧‧ robot arm unit

6‧‧‧Control and measurement unit

31‧‧‧Top plate

311‧‧‧ opening

32‧‧‧ floor

33‧‧‧Side

34‧‧‧ windows

35‧‧‧ electromagnetic wave absorber

4‧‧‧ high directivity antenna

5‧‧‧ robot arm unit

50‧‧‧Fixed

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‧‧‧The second joint

543‧‧‧arm

55‧‧‧clamp arm

551‧‧‧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‧‧‧Reflector

R‧‧‧ radius of hemisphere

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

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

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

FIG. 4 is another detailed 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 according to the present invention is suitable for measuring a hemispherical radiation field type 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 substantially 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.

The top plate 31, the side plates 33, and the bottom plate 32 are attached with a plurality of electromagnetic wave absorbers 35, and the top plate 31 has an opening 311, which is located approximately 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, At this time, the inner and outer spaces of the anechoic chamber 3 are communicated through the opening 311, and when the window 34 is closed, the opening 311 of the top plate 31 is covered by the window 34. At this time, the antenna 2 to be tested is disposed close to the top plate 31, and The main radiation surface 21 is a bottom plate 32 facing the anechoic chamber 3.

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

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 base 50 is disposed at the geometric center of the bottom plate 32 of the anechoic chamber 3.

The movable arm 51 extends from the fixed base 50 and has a rotating member 52, a first arm portion 53, a second arm portion 54, and a clamp arm portion 55.

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

The first arm portion 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 portion 53 It is connected to the joint 522 of the rotating member 52, so that the first arm portion 53 can rotate relative to the rotating member 52.

The second arm portion 54 has a first joint 541, a second joint 542, and an arm rod 543 connecting the first joint 541 and the second joint 532, and the first joint 541 of the second arm portion 54 Is connected to the second joint 532 of the first arm portion 53 such that the second arm portion 54 The first arm portion 53 is rotatable.

The clamp arm portion 55 is connected to the second joint 542 of the second arm portion 54, so that the clamp arm portion 55 can rotate relative to the second arm portion 54. The high-directional antenna 4 is disposed on the clamp arm portion 55 and is linked by the movable arm 51.

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

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

Referring to FIG. 3, FIG. 3 is a diagram 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 high directivity antenna 4 is used as a receiving antenna.

The control and measurement unit 6 includes a radio frequency signal generator 61 and a signal feed. Into the 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 radio frequency signal generator 61 to receive the radio frequency output signal, and has a probe 621 and a camera lens 622. 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 2 under test to transmit the RF output signal to the antenna 2 under test. The antenna 2 under test 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 receiving signal.

The spectrum analyzer 63 is electrically connected to the high-directional antenna 4 to receive the RF receiving signal, and measures the amplitude of the RF receiving 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 receiving signal, and according to the amplitude of the RF receiving signal, the radiation gain of the highly directional antenna 4, the radius R of the hemispherical surface, and the signal feeding fixture The path loss (insertion loss) of 62 jointly calculates the radiation gain of the antenna 2 to be measured when the highly directional antenna 4 is located at the measurement point, and uses the spatial information of the locations of the measurement points and the radiation gain to construct The hemispherical radiation field pattern of the antenna 2 to be tested.

Referring to FIG. 4, FIG. 4 is a diagram 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 high-directional antenna 4 is electrically connected to the radio frequency signal generator 61 to receive the radio signal. The frequency output signal is converted into the electromagnetic wave, and the antenna 2 to be tested receives the electromagnetic wave and is converted into a radio frequency receiving 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, and the probe 621 is used to touch the antenna 2 to be tested to receive the radio frequency receiving signal.

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

The computer 64 is electrically connected to the spectrum analyzer 63 to obtain the amplitude of the RF receiving signal, and according to the amplitude of the RF receiving signal, the radiation gain of the highly directional antenna 4, the radius R of the hemispherical surface, and the signal feeding fixture The path loss of 62 collectively calculates the radiation gain of the antenna 2 under test when the highly directional antenna 4 is located at the measurement point, and uses the spatial information of the locations of the measurement points and the radiation gain to construct the antenna 2 under test Hemispherical radiation field type.

5 is a second preferred embodiment of the present invention, which is similar to the first preferred embodiment (see FIG. 2). The difference lies in that the first preferred embodiment supports a far-field or near-field measurement method. The second preferred embodiment further supports the measurement method of the narrow field, so the second preferred embodiment further includes a reflector 7. The similar parts of this preferred embodiment and this first preferred embodiment are not repeated, and the differences are explained below.

The clamp arm portion 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 portion 55. The high-directional antenna 4 is disposed at the clamp arm portion. 55 的 第二 端 552。 55 second end 552.

In the preferred embodiment, the reflecting mirror 7 is a flat mirror, and the main beam of the radiation pattern of the high-directional antenna 4 is directed toward the reflecting mirror 7. When the antenna 2 to be tested is used as a transmitting antenna, When the highly directional antenna 4 is used as a receiving antenna, the electromagnetic wave emitted by the antenna 2 to be tested is transmitted to the reflector 7 and then reflected by the reflector 7 to the highly directional antenna 4; otherwise, when the highly directional antenna 4 When 4 is used as a transmitting antenna and the antenna 2 to be tested is used as a receiving antenna, the electromagnetic wave emitted by the highly directional antenna 4 is transmitted to the reflecting mirror 7 and then reflected by the reflecting mirror 7 to the antenna 2 to be received. Compared with the first preferred embodiment, the space requirement of the anechoic chamber 3 of the second preferred embodiment is smaller (reduced field measurement), because the antenna 2 and the antenna 2 to be tested in the first preferred embodiment are The high-directional antennas 4 receive and transmit the electromagnetic waves in a line-of-sight manner, but the second preferred embodiment uses the reflection method of the reflector 7 to transmit and receive electromagnetic waves, which effectively extends 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 preset measurement points, and the measurement points are located on a hemisphere with a preset radius. When the reflecting mirror 7 moves to each preset measuring point, the control and measuring unit 6 transmits and receives an electromagnetic wave (the electromagnetic wave passes through the reflecting mirror 7) through the antenna 2 and the high directivity antenna 4 respectively. A radiation gain of the antenna 2 to be measured is measured, and the control and measurement unit 6 also uses the plurality of radiation gains corresponding to the measurement points to construct a hemispherical radiation field pattern of the antenna 2 to be measured.

When the antenna 2 under test serves as a transmitting antenna and the high directivity antenna 4 serves as a receiving antenna, the antenna under test 2 receives the radio frequency output signal and converts it into the electromagnetic wave transmission, and the reflection wave 7 reflects a portion of the electromagnetic wave to the antenna. A directional antenna 4, the high-directional antenna 4 receiving part of the electromagnetic wave and converted into a radio frequency receiving signal, the spectrum analyzer 63 is electrically connected to the high directional antenna 4 to receive the radio frequency receiving signal, and measuring the radio frequency receiving signal The amplitude. The computer 64 is electrically connected to the spectrum analyzer 63 to receive the amplitude of the RF receiving signal, and according to the radio frequency, The amplitude of the received signal, the radiation gain of the highly directional antenna 4, the radius R of the hemispherical surface, the linear distance L between the highly directional antenna 4 and the reflector 7, and the path of the signal feeding into the fixture 62 The loss collectively calculates the radiation gain of the antenna 2 to be measured when the mirror 7 is located at the measurement point, and uses the spatial information of the locations of the measurement points and the radiation gain to construct the hemispherical radiation of the antenna 2 to be measured. Field type.

Referring to FIG. 6, when the highly directional antenna 4 is used as a transmitting antenna and the antenna 2 to be tested is used as a receiving antenna, the highly directional antenna 4 is electrically connected to the radio frequency signal generator 61 to receive a radio frequency output signal and convert it into the electromagnetic wave. It is emitted towards the reflecting mirror 7, and the reflecting mirror 7 reflects the electromagnetic wave to the antenna 2 to be tested. The antenna 2 to be tested receives the electromagnetic wave and converts it into a radio frequency receiving signal. The probe 621 is used to touch the antenna 2 to receive the radio frequency receiving signal. The spectrum analyzer 63 is electrically connected to the signal feeding fixture 62 to receive the RF receiving signal, and measures the amplitude of the RF receiving signal. The computer 64 is electrically connected to the spectrum analyzer 63 to obtain the amplitude of the RF receiving signal, and according to the amplitude of the RF receiving signal, the radiation gain of the highly directional antenna 4, the radius of the hemispherical surface, and 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 measured when the reflector 7 is at the measurement point, and the measurement points are used. The spatial information of the location and the radiation gains constitute the hemispherical radiation field pattern of the antenna 2 to be tested.

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

Because the power P1 of the RF output signal output by the RF signal generator 61 is known, and the high-directional antenna 4 is also a known antenna (known gain), it can be calculated that the high-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 2 to be measured can be calculated. In addition, the spectrum analyzer 63 is connected to The power P4 of the RF receiving signal can be measured, and the difference between the power P4 and the power P3 is caused by both the gain of the antenna 2 to be tested and the path loss (insertion loss) of the signal feeding the fixture 62, and the path loss It is known again (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 hemispherical surface, L: the linear distance between the highly directional antenna 4 and the reflector 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 clamp arm portion 55 can be between each other. 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 tested is added, the computer 64 The data ( ψ , θ , G ) can construct the hemispherical radiation field 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 of the antenna 2 under test, and the computer 64 is used to construct the hemispherical radiation of the antenna 2 under test Field type, which in turn solves the disadvantages of the prior art.

However, the above are only examples of the present invention. When the scope of implementation of the present invention cannot be limited by this, any simple equivalent changes and modifications made in accordance with the scope of the patent application and the content of the patent specification of the present invention are still Within the scope of the invention patent.

Claims (8)

An antenna radiation field type automatic measurement system is suitable for measuring a hemispherical radiation field pattern of an antenna under test. The antenna under test includes a main radiating surface. The system includes: an anechoic chamber including a top plate, and A bottom plate of the top plate, the antenna to be tested is arranged close to the top plate, and the main radiation surface of the antenna to be tested is arranged toward the bottom plate; a highly directional antenna; a robot arm unit is arranged in the anechoic chamber and includes a A fixed base and a movable arm are disposed on the bottom plate of the anechoic chamber, the movable arm extends from the fixed base and has a clamping arm portion, and the high-directional antenna is disposed on the clamping arm portion and Linked by the movable arm; and a control and measurement unit, electrically connecting the antenna under test, the high directivity antenna and the robot arm unit, and controlling the robot arm unit to link the high directivity antenna in a plurality of preset Move between measurement points, and the preset measurement points are located on a hemisphere with a preset radius. When the highly directional antenna moves to each preset measurement point, the control and measurement Unit is The antenna under test and the high directivity antenna transmit and receive an electromagnetic wave 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 The hemispherical radiation field pattern of the antenna under test, and a circular opening defined by the hemisphere is toward the top plate of the anechoic chamber and the antenna under test, and the antenna under test, the center of the sphere of the hemisphere, and The projections of the fixed base on a normal direction of the bottom plate overlap, and the top plate of the anechoic chamber has an opening. The anechoic chamber further includes a window, and the inner surface of the window is used to attach the antenna to be tested. When opened, the inner and outer spaces of the anechoic chamber are communicated 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 faces the bottom plate of the anechoic chamber. According to the antenna radiation field type automatic measurement system according to item 1 of the patent application scope, the movable arm further includes: a rotating member having a rotating end portion and a joint, the rotating end portion is sleeved on the fixed base, and the rotation The piece has the function of rotating from 0 to 360 degrees with respect to the fixed seat, and the axis line of the rotating piece and the center of the hemispherical surface are located in the normal direction of the bottom plate together; a first arm portion having 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 part is connected with the joint of the rotating member, so that the first arm part can Rotating relative to the rotating member; and a second arm portion having a first joint, a second joint, and an arm rod connecting the first joint and the second joint, and the first joint of the second arm portion Is connected with the second joint of the first arm part, so that the second arm part can rotate relative to the first arm part, the clamped arm part is connected with the second joint of the second arm part, so that the clamped part The arm portion is rotatable relative to the second arm portion. The antenna radiation field type automatic measurement system according to item 1 of the scope of patent application, 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 fed into a fixture and 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 arranged toward the probe to assist in observing the image of the probe, and the probe is used to touch the antenna to be tested. 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, the highly directional antenna receives the electromagnetic wave and converts it into a radio frequency receiving signal; a spectrum analyzer, electrically connected The highly directional antenna to receive the RF receiving signal and measure the amplitude of the RF receiving signal; and a computer electrically connected to the spectrum analyzer to obtain the amplitude of the RF receiving signal, and according to the amplitude of the RF receiving 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 highly directional antenna. The radiation gain of the antenna under test when the line is located at the measurement point, and a hemispherical radiation field pattern of the antenna under test is constructed. The antenna radiation field type automatic measurement system 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 preset size, and the high directivity antenna is electrically connected to the A radio frequency signal generator receives the radio frequency output signal and converts it into the electromagnetic wave. The antenna under test receives the electromagnetic wave and converts it into a radio frequency reception signal. A signal is fed into the fixture, which has a probe and a camera lens. The camera lens faces the camera. A probe is set to assist in observing the probe image, the probe is used to touch the antenna under test to receive the radio frequency receiving signal; a spectrum analyzer is electrically connected to the signal feeding fixture to receive the radio frequency receiving signal, and measures Measuring the amplitude of the RF receiving signal; and a computer, electrically connected to the spectrum analyzer to obtain the amplitude of the RF receiving signal, and according to the amplitude of the RF receiving signal, the radiation gain of the highly directional antenna, and the radius of the hemisphere And the path loss of the signal feeding fixture to calculate the radiation gain of the antenna under test when the highly directional antenna is located at the measurement point, The hemispherical radiation field pattern of the antenna under test is constructed. An antenna radiation field type automatic measurement system is suitable for measuring a hemispherical radiation field pattern of an antenna under test. The antenna under test includes a main radiating surface. The system includes: an anechoic chamber including a top plate, and A bottom plate of the top plate, the antenna to be tested is disposed close to the top plate, and a main radiation surface of the antenna to be tested is disposed toward the bottom plate; a reflector; a highly directional antenna including a main radiation surface, and the high directivity antenna A main beam of the radiation field type 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 reflector and reflected; a robot arm unit is disposed in the anechoic chamber And includes a fixed base and a movable arm, the fixed base is arranged on the bottom plate of the anechoic chamber, the movable arm extends from the fixed base and has a clamping arm portion, and the clamping arm portion has a first end And a second end, the reflector is disposed at the first end of the grip arm portion, the high-directional antenna is disposed at the second end of the grip arm portion, and a control and measurement unit is electrically connected to the standby Measuring antenna, the height A directional antenna and the robot arm unit, and control the robot arm unit to move the reflector to move between a plurality of preset measurement points, and the measurement points are located on a hemisphere with a preset radius. When the reflector moves to each preset measurement point, the control and measurement unit measures the radiation gain of the antenna under test through the antenna and the highly directional antenna, respectively, receiving and transmitting the electromagnetic waves. The control and measurement unit also uses the plurality of radiation gains corresponding to the measurement points to construct a hemispherical radiation field pattern of the antenna under test, and a circular opening defined by the hemisphere faces the radio wave. The top plate of the dark room and the antenna under test, and the projection of the antenna under test, the center of the hemispherical surface, and the fixed seat in a normal direction of the bottom plate overlap, the movable arm further includes: a rotating member, having A rotating end and a joint, the rotating end is sleeved on the fixed seat, the rotating member has a function of rotating 0 to 360 degrees relative to the fixed seat, and the axis of the rotating member and the hemisphere The center of the ball is located at the bottom In the direction of the normal line; a first arm portion having 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 portion and The joints of the rotating member are connected so that the first arm can rotate relative to the rotating member; and a second arm has a first joint, a second joint, and a connection between the first joint and the second An articulated arm, and the first joint of the second arm portion is connected to the second joint of the first arm portion, so that the second arm portion can rotate relative to the first arm portion, and the clamped arm portion and the The second joint of the second arm portion is connected, so that the clamped arm portion can rotate relative to the second arm portion. The antenna radiation field type automatic measurement system according to item 5 of the patent application scope, wherein the reflecting mirror is a flat mirror. The antenna radiation field type automatic measurement system according to item 5 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 fed into a fixture and 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 arranged toward the probe to assist in observing the image of the probe, and the probe is used to touch the antenna to be tested. The radio frequency output signal is transmitted to the antenna under test. The antenna under test receives the radio frequency output signal and converts it into the electromagnetic wave transmission. The electromagnetic wave reflected by the reflecting part of the mirror reaches the high directivity antenna. The high directivity antenna receives Part of the electromagnetic wave is converted into a radio frequency receiving signal; a spectrum analyzer is electrically connected to the highly directional antenna to receive the radio frequency receiving signal and measures the amplitude of the radio frequency receiving signal; and a computer is electrically connected to the spectrum analyzer To obtain the amplitude of the RF receiving signal, and according to the amplitude of the RF receiving signal, the radiation gain of the highly directional antenna, and the hemisphere The radius of the surface, the straight line distance between the highly directional antenna and the reflector, and the path loss of the signal feeding fixture, jointly calculate the radiation gain of the antenna under test when the reflector is located at the measurement point, and use The spatial information of the locations of the measurement points and the radiation gains constitute the hemispherical radiation field pattern of the antenna under test. The antenna radiation field type automatic measurement system according to item 5 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, and the high directivity 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 transmits it to the reflector. The reflector 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 The fixture is provided with a probe and a camera lens. The camera lens is arranged toward the probe to assist in observing the probe image. The probe is used to touch the antenna under test to receive the radio frequency reception signal. A spectrum analyzer , Electrically connecting the signal feeding fixture to receive the RF receiving signal, and measuring the amplitude of the RF receiving signal; and a computer, electrically connecting the spectrum analyzer to obtain the amplitude of the RF receiving signal, and receiving the signal according to the RF receiving signal Amplitude of the high-directional antenna, the radiation gain of the high-directional antenna, the radius of the hemispherical surface, and the straight line between the high-directional antenna and the mirror Distance, and the path loss of the signal feeding fixture, jointly calculate the radiation gain of the antenna under test when the reflector is located at the measurement point, and use the spatial information of the location of the measurement points and the radiation gain to construct the Hemispherical radiation field pattern of the antenna under test.