CN112130006A

CN112130006A - Antenna test method and system

Info

Publication number: CN112130006A
Application number: CN202011014259.3A
Authority: CN
Inventors: 王卫民; 高忠雄; 吴永乐; 刘元安
Original assignee: Beijing University of Posts and Telecommunications
Current assignee: Beijing University of Posts and Telecommunications
Priority date: 2020-09-24
Filing date: 2020-09-24
Publication date: 2020-12-25

Abstract

The embodiment of the invention provides an antenna testing method and system.A vector network analyzer sends a generated radio frequency signal to a transmitting expansion module; and sending the generated local oscillation signal to the transmission expansion module and the down converter. The transmitting expansion module performs frequency multiplication on the radio frequency signal to obtain a millimeter wave signal, and the millimeter wave signal is sent to the down converter through the transmitting antenna; and performing frequency mixing processing on the radio frequency signal and the local oscillator signal to obtain a reference intermediate frequency signal, and sending the reference intermediate frequency signal to the vector network analyzer. The down converter receives the millimeter wave signal through the antenna to be tested, performs frequency mixing processing on the millimeter wave signal and the local oscillator signal to obtain a test intermediate frequency signal, and sends the test intermediate frequency signal to the vector network analyzer. And the vector network analyzer synthesizes the reference intermediate frequency signal and the test intermediate frequency signal to obtain a target signal. A target signal indicating the performance of the antenna to be tested can be obtained based on the millimeter wave signal, and the complexity and cost of the antenna test can be reduced.

Description

Antenna test method and system

Technical Field

The present invention relates to the field of communications technologies, and in particular, to an antenna testing method and system.

Background

Millimeter-wave devices (e.g., millimeter-wave filters, millimeter-wave antennas, etc.) have the advantages of being lightweight, small in size, and easy to integrate. Therefore, the millimeter wave device is widely applied to the fields of communication, radar, guidance, remote sensing technology, radio astronomy, clinical medicine, spectroscopy and the like.

In the prior art, millimeter wave devices (e.g., millimeter wave antennas) may be tested based on a test system. The test system can generate a test signal and test the millimeter wave antenna based on the test signal, and then a target signal capable of representing the performance of the millimeter wave antenna can be obtained.

Disclosure of Invention

The embodiment of the invention aims to provide an antenna test method and system, which can generate millimeter wave signals and obtain target signals representing the performance of an antenna to be tested based on the millimeter wave signals, and the antenna test system has fewer devices and low device cost and can reduce the complexity and cost of antenna test. The specific technical scheme is as follows:

in a first aspect, to achieve the above object, an embodiment of the present invention provides an antenna testing system, where the antenna testing system includes: the device comprises a vector network analyzer, a transmitting expansion module, a down converter, an antenna to be tested and a transmitting antenna, wherein the vector network analyzer is connected with the transmitting expansion module and the down converter, the transmitting expansion module is connected with the transmitting antenna, and the down converter is connected with the antenna to be tested, wherein:

the vector network analyzer is used for generating a radio frequency signal and sending the radio frequency signal to the transmitting expansion module; generating a local oscillation signal, and respectively sending the local oscillation signal to the transmission expansion module and the down converter;

the transmitting and expanding module is used for carrying out frequency doubling processing on the received radio frequency signal to obtain a millimeter wave signal and transmitting the millimeter wave signal to the down converter through the transmitting antenna; performing frequency mixing processing on the received radio frequency signal and the local oscillator signal to obtain a reference intermediate frequency signal, and sending the reference intermediate frequency signal to the vector network analyzer;

the down converter is used for receiving the millimeter wave signal sent by the emission extension module through the antenna to be tested, performing frequency mixing processing on the millimeter wave signal and the local oscillator signal to obtain a test intermediate frequency signal, and sending the test intermediate frequency signal to the vector network analyzer;

the vector network analyzer is further configured to perform synthesis processing on the received reference intermediate frequency signal and the test intermediate frequency signal to obtain a target signal capable of representing the performance of the antenna to be tested.

Optionally, the antenna test system further includes a power divider; the power divider is connected with the vector network analysis module, the transmitting expansion module and the down converter;

the vector network analyzer is specifically configured to generate the local oscillator signal and send the local oscillator signal to the power divider;

the power divider is configured to obtain two paths of same local oscillator signals based on the received local oscillator signals, and send the local oscillator signals to the transmission expansion module and the down converter respectively.

Optionally, the transmitting and expanding module includes: the vector network analyzer comprises a first frequency multiplier, a second frequency multiplier, a directional coupler, a first mixer, a first low-pass filter and a first amplifier, wherein the first frequency multiplier is connected with the vector network analyzer and the directional coupler, the second frequency multiplier is connected with the vector network analyzer and the first mixer, the directional coupler is connected with the transmitting antenna and the first mixer, the first mixer is connected with the first low-pass filter, the first low-pass filter is connected with the first amplifier, and the first amplifier is connected with the vector network analyzer;

the first frequency multiplier is used for receiving the radio-frequency signal sent by the vector network analyzer, performing frequency multiplication processing on the radio-frequency signal to obtain a millimeter-wave signal, and sending the millimeter-wave signal to the directional coupler;

the directional coupler is used for forwarding the received millimeter wave signal to the down converter through the transmitting antenna, performing coupling processing on the millimeter wave signal to obtain the coupled millimeter wave signal, and sending the coupled millimeter wave signal to the first mixer;

the second frequency multiplier is configured to receive a local oscillator signal sent by the vector network analyzer, perform frequency multiplication processing on the local oscillator signal to obtain a frequency-multiplied local oscillator signal, and send the frequency-multiplied local oscillator signal to the first frequency mixer;

the first mixer is configured to perform frequency mixing processing on the received coupled millimeter wave signal and the frequency-multiplied local oscillator signal to obtain a first intermediate frequency signal, and send the first intermediate frequency signal to the first low-pass filter;

the first low-pass filter is configured to perform filtering processing on a received first intermediate-frequency signal to obtain a filtered first intermediate-frequency signal, and send the filtered first intermediate-frequency signal to the first amplifier;

the first amplifier is configured to amplify the received filtered first intermediate frequency signal to obtain the reference intermediate frequency signal, and send the reference intermediate frequency signal to the vector network analyzer.

Optionally, the down converter includes: the vector network analyzer comprises a third frequency multiplier, a second mixer, a second low-pass filter and a second amplifier, wherein the third frequency multiplier is connected with the vector network analyzer and the second mixer, the second mixer is connected with the antenna to be tested and the second low-pass filter, the second low-pass filter is connected with the second amplifier, and the second amplifier is connected with the vector network analyzer;

the third frequency multiplier is configured to receive the local oscillator signal sent by the vector network analyzer, perform frequency multiplication processing on the local oscillator signal to obtain a frequency-multiplied local oscillator signal, and send the frequency-multiplied local oscillator signal to the second frequency mixer;

the second mixer is configured to receive the millimeter wave signal sent by the launch extension module through the antenna to be tested, perform frequency mixing processing on the millimeter wave signal and the frequency-multiplied local oscillator signal to obtain a second intermediate frequency signal, and send the second intermediate frequency signal to the second low-pass filter;

the second low-pass filter is configured to perform filtering processing on the received second intermediate-frequency signal to obtain a filtered second intermediate-frequency signal, and send the filtered second intermediate-frequency signal to the second amplifier;

and the second amplifier is used for amplifying the received filtered second intermediate frequency signal to obtain the test intermediate frequency signal and sending the test intermediate frequency signal to the vector network analyzer.

In a second aspect, to achieve the above object, an embodiment of the present invention provides an antenna testing method, where the method is applied to an antenna testing system, where the antenna testing system includes: the device comprises a vector network analyzer, a transmitting expansion module, a down converter, an antenna to be tested and a transmitting antenna, wherein the vector network analyzer is connected with the transmitting expansion module and the down converter, the transmitting expansion module is connected with the transmitting antenna, and the down converter is connected with the antenna to be tested, and the method comprises the following steps:

the vector network analyzer generates a radio frequency signal and sends the radio frequency signal to the transmitting expansion module; generating a local oscillation signal, and respectively sending the local oscillation signal to the transmission expansion module and the down converter;

the transmitting expansion module performs frequency multiplication on the received radio frequency signal to obtain a millimeter wave signal, and sends the millimeter wave signal to the down converter through the transmitting antenna; performing frequency mixing processing on the received radio frequency signal and the local oscillator signal to obtain a reference intermediate frequency signal, and sending the reference intermediate frequency signal to the vector network analyzer;

the down converter receives the millimeter wave signal sent by the emission extension module through the antenna to be tested, performs frequency mixing processing on the millimeter wave signal and the local oscillator signal to obtain a test intermediate frequency signal, and sends the test intermediate frequency signal to the vector network analyzer;

and the vector network analyzer synthesizes the received reference intermediate frequency signal and the test intermediate frequency signal to obtain a target signal capable of expressing the performance of the antenna to be tested.

Optionally, the antenna test system further includes a power divider; the power divider is connected with the vector network analyzer, the transmitting expansion module and the down converter;

the vector network analyzer generates local oscillation signals and respectively sends the local oscillation signals to the transmission expansion module and the down converter, and the method comprises the following steps:

the vector network analyzer generates the local oscillation signal and sends the local oscillation signal to the power divider;

the power divider obtains two paths of same local oscillation signals based on the received local oscillation signals, and sends the local oscillation signals to the emission expansion module and the down converter respectively.

Optionally, the transmitting and expanding module includes: the frequency multiplier comprises a first frequency multiplier, a second frequency multiplier, a directional coupler, a first frequency mixer, a first low-pass filter and a first amplifier; the first frequency multiplier is connected with the vector network analyzer and the directional coupler, the second frequency multiplier is connected with the vector network analyzer and the first mixer, the directional coupler is connected with the transmitting antenna and the first mixer, the first mixer is connected with the first low-pass filter, the first low-pass filter is connected with the first amplifier, and the first amplifier is connected with the vector network analyzer;

the transmitting expansion module performs frequency multiplication on the received radio frequency signal to obtain a millimeter wave signal, and sends the millimeter wave signal to the down converter through the transmitting antenna; and performing frequency mixing processing on the received radio frequency signal and the local oscillator signal to obtain a reference intermediate frequency signal, and sending the reference intermediate frequency signal to the vector network analyzer, including:

the first frequency multiplier receives the radio-frequency signal sent by the vector network analyzer, performs frequency multiplication processing on the radio-frequency signal to obtain a millimeter-wave signal, and sends the millimeter-wave signal to the directional coupler;

the directional coupler forwards the received millimeter wave signal to the down converter through the transmitting antenna, couples the millimeter wave signal to obtain the coupled millimeter wave signal, and sends the coupled millimeter wave signal to the first mixer;

the second frequency multiplier receives a local oscillation signal sent by the vector network analyzer, performs frequency multiplication processing on the local oscillation signal to obtain a frequency-multiplied local oscillation signal, and sends the frequency-multiplied local oscillation signal to the first frequency mixer;

the first mixer performs frequency mixing processing on the received coupled millimeter wave signal and the frequency-multiplied local oscillator signal to obtain a first intermediate frequency signal, and sends the first intermediate frequency signal to the first low-pass filter;

the first low-pass filter performs filtering processing on the received first intermediate-frequency signal to obtain a filtered first intermediate-frequency signal, and sends the filtered first intermediate-frequency signal to the first amplifier;

and the first amplifier amplifies the received filtered first intermediate frequency signal to obtain the reference intermediate frequency signal, and sends the reference intermediate frequency signal to the vector network analyzer.

the down converter carries out frequency mixing processing on the received millimeter wave signal and the local oscillator signal to obtain a test intermediate frequency signal, and sends the test intermediate frequency signal to the vector network analyzer, and the frequency mixing processing method comprises the following steps:

the third frequency multiplier receives the local oscillator signal sent by the vector network analyzer, performs frequency multiplication processing on the local oscillator signal to obtain the frequency-multiplied local oscillator signal, and sends the frequency-multiplied local oscillator signal to the second frequency mixer;

the second mixer receives the millimeter wave signal sent by the emission extension module through the antenna to be tested, performs frequency mixing processing on the millimeter wave signal and the frequency-multiplied local oscillator signal to obtain a second intermediate frequency signal, and sends the second intermediate frequency signal to the second low-pass filter;

the second low-pass filter performs filtering processing on the received second intermediate-frequency signal to obtain a filtered second intermediate-frequency signal, and sends the filtered second intermediate-frequency signal to the second amplifier;

and the second amplifier amplifies the received filtered second intermediate frequency signal to obtain the test intermediate frequency signal, and sends the test intermediate frequency signal to the vector network analyzer.

An antenna test system provided in an embodiment of the present invention includes: the vector network analyzer is connected with the transmitting expansion module and the down converter, the transmitting expansion module is connected with the transmitting antenna, and the down converter is connected with the antenna to be tested. The vector network analyzer generates a radio frequency signal and sends the radio frequency signal to the transmitting expansion module; and generating local oscillation signals and respectively sending the local oscillation signals to the transmission expansion module and the down converter. The transmitting expansion module performs frequency multiplication on the received radio frequency signal to obtain a millimeter wave signal, and sends the millimeter wave signal to the down converter through the transmitting antenna; and performing frequency mixing processing on the received radio frequency signal and the local oscillator signal to obtain a reference intermediate frequency signal, and sending the reference intermediate frequency signal to the vector network analyzer. The down converter carries out frequency mixing processing on the received millimeter wave signals and the local oscillation signals to obtain test intermediate frequency signals, and sends the test intermediate frequency signals to the vector network analyzer. And the vector network analyzer synthesizes the received reference intermediate frequency signal and the test intermediate frequency signal to obtain a target signal capable of expressing the performance of the antenna to be tested.

According to the antenna test system provided by the embodiment of the invention, the emission extension module can carry out frequency doubling processing on the radio-frequency signal generated by the vector network analyzer, so that the frequency of the radio-frequency signal is improved, and further, a millimeter wave signal can be obtained. Accordingly, a target signal representing the performance of the antenna to be tested can be obtained based on the millimeter wave signal. In addition, the antenna test system has fewer devices and low device cost, and can reduce the complexity and cost of antenna test.

Of course, not all of the advantages described above need to be achieved at the same time in the practice of any one product or method of the invention.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other embodiments can be obtained by using the drawings without creative efforts.

Fig. 1 is a structural diagram of an antenna testing system according to an embodiment of the present invention;

fig. 2 is a block diagram of another antenna testing system according to an embodiment of the present invention;

fig. 3 is a block diagram of another antenna test system according to an embodiment of the present invention;

fig. 4 is a block diagram of another antenna test system according to an embodiment of the present invention;

fig. 5 is a block diagram of another antenna test system according to an embodiment of the present invention;

fig. 6 is a structural diagram of a transmitting expansion module according to an embodiment of the present invention;

fig. 7 is a flowchart of an antenna testing method according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1, fig. 1 is a structural diagram of an antenna testing system according to an embodiment of the present invention, where the antenna testing system includes: the device comprises a vector network analyzer 101, a transmitting expansion module 102, a down converter 103, an antenna to be tested 104 and a transmitting antenna 105, wherein the vector network analyzer 101 is connected with the transmitting expansion module 102 and the down converter 103, the transmitting expansion module 102 is connected with the transmitting antenna 105, and the down converter 103 is connected with the antenna to be tested 104. Wherein:

the vector network analyzer 101 is configured to generate a radio frequency signal and send the radio frequency signal to the transmission extension module 102; and generating a local oscillation signal, and respectively sending the local oscillation signal to the transmission expansion module 102 and the down converter 103.

The transmitting and expanding module 102 is configured to perform frequency doubling processing on the received radio frequency signal to obtain a millimeter wave signal, and send the millimeter wave signal to the down converter 103 through the transmitting antenna 105; and performing frequency mixing processing on the received radio frequency signal and the local oscillator signal to obtain a reference intermediate frequency signal, and sending the reference intermediate frequency signal to the vector network analyzer 101.

And the down converter 103 is configured to receive the millimeter wave signal sent by the transmit extension module 102 through the antenna to be tested 104, perform frequency mixing processing on the millimeter wave signal and the local oscillator signal to obtain a test intermediate frequency signal, and send the test intermediate frequency signal to the vector network analyzer 101.

The vector network analyzer 101 is further configured to perform synthesis processing on the received reference intermediate frequency signal and the test intermediate frequency signal to obtain a target signal capable of representing the performance of the antenna to be tested 104.

In the embodiment of the present invention, the antenna to be tested 104 is used for receiving signals, and the antenna to be tested 104 may be a millimeter wave antenna, or the antenna to be tested 104 may also be a microwave antenna.

In one implementation, the vector network analyzer 101 may be connected to the launch expansion module 102 and the down converter 103 through rf cables, respectively, the launch expansion module 102 may be connected to the launch antenna 105 through an open waveguide probe, and the down converter 103 may be connected to the antenna to be tested 104 through an open waveguide probe.

The vector network analyzer 101 may generate a radio frequency signal and a local oscillator signal, and then the vector network analyzer 101 may transmit the radio frequency signal and the local oscillator signal to the transmit extension module 102. Correspondingly, after receiving the radio frequency signal sent by the vector network analyzer 101, the transmission expansion module 102 may perform frequency doubling processing on the radio frequency signal according to a preset multiple to obtain a millimeter wave signal, and send the millimeter wave signal to the down converter 103 through the transmitting antenna 105. The frequency doubling process is to increase the frequency of the received rf signal by a predetermined multiple.

The preset multiple may be set by a technician as required, for example, the frequency of the radio frequency signal generated by the vector network analyzer 101 is 20GHz, and when a millimeter wave signal with a frequency of 40GHz needs to be generated, the preset multiple may be 2, and correspondingly, the transmission extension module 102 may perform frequency doubling processing on the radio frequency signal by 2, so as to obtain a millimeter wave signal with a frequency of 40 GHz.

The transmitting and expanding module 102 may further perform frequency mixing processing on the received radio frequency signal and the local oscillator signal to obtain a reference intermediate frequency signal, and send the reference intermediate frequency signal to the vector network analyzer 101.

The vector network analyzer 101 may send a local oscillator signal to the downconverter. Correspondingly, the down converter 103 may receive the millimeter wave signal sent by the transmit extension module 102 through the antenna to be tested 104, and may further perform frequency mixing processing on the received local oscillator signal and the millimeter wave signal to obtain a test intermediate frequency signal, and send the test intermediate frequency signal to the vector network analyzer 101.

Further, the vector network analyzer 101 may perform synthesis processing on the received reference intermediate frequency signal and the test intermediate frequency signal to obtain a signal (i.e., a target signal) capable of representing the performance of the antenna 104 to be tested.

In addition, the vector network analyzer 101 may also display a waveform diagram of the target signal. Subsequently, the technician may determine parameters (e.g., amplitude, frequency, etc.) of the target signal based on the waveform pattern displayed by the vector network analyzer 101, and determine the performance of the antenna to be tested 104 (e.g., gain of the antenna to be tested, directional pattern of the antenna to be tested, etc.) based on the read parameters.

Alternatively, the target signal is analyzed by the electronic device to obtain parameters (e.g., amplitude, frequency, etc.) of the target signal, and then, based on the obtained parameters, a performance result of the antenna to be tested 104 (e.g., a gain of the antenna to be tested, a directional pattern of the antenna to be tested, etc.) is generated.

In an embodiment of the present invention, referring to fig. 2, the antenna test system further includes a power divider 106, and the power divider 106 is connected to the vector network analyzer 101, the transmission expansion module 102, and the down converter 103.

The vector network analyzer 101 is specifically configured to generate a local oscillation signal, and send the local oscillation signal to the power divider 106.

The power divider 106 is configured to obtain two paths of same local oscillation signals based on the received local oscillation signals, and send the local oscillation signals to the transmission expansion module 102 and the down converter 103, respectively.

In one implementation, the vector network analyzer 101 may be connected to the power divider 106 through a radio frequency cable, and the power divider 106 is connected to the transmission expansion module 102 and the down converter 103 through radio frequency cables, respectively.

Further, after generating the local oscillation signal, the vector network analyzer 101 may send the generated local oscillation signal to the power divider 106. Correspondingly, the power divider 106 may generate one local oscillation signal that is the same as the received local oscillation signal after receiving the local oscillation signal, and may further obtain two same local oscillation signals, and send the two same local oscillation signals to the transmission expansion module 102 and the down converter 103, respectively.

In one embodiment of the present invention, referring to fig. 3, the transmit spreading module 102 may include: a first frequency multiplier 1021, a second frequency multiplier 1022, a directional coupler 1023, a first mixer 1024, a first low-pass filter 1025 and a first amplifier 1026, wherein the first frequency multiplier 1021 is connected with the vector network analyzer 101 and the directional coupler 1023, the second frequency multiplier 1022 is connected with the vector network analyzer 101 and the first mixer 1024, the directional coupler 1023 is connected with the transmitting antenna 105 and the first mixer 1024, the first mixer 1024 is connected with the first low-pass filter 1025, the first low-pass filter 1025 is connected with the first amplifier 1026, and the first amplifier 1026 is connected with the vector network analyzer 101;

the first frequency multiplier 1021 is configured to receive the radio frequency signal sent by the vector network analyzer 101, perform frequency multiplication on the radio frequency signal to obtain a millimeter wave signal, and send the millimeter wave signal to the directional coupler 1023.

The directional coupler 1023 is configured to forward the received millimeter wave signal to the down converter 103 through the transmitting antenna 105, perform coupling processing on the millimeter wave signal, obtain a coupled millimeter wave signal, and send the coupled millimeter wave signal to the first mixer 1024.

The second frequency multiplier 1022 is configured to receive the local oscillator signal sent by the vector network analyzer 101, perform frequency multiplication on the local oscillator signal to obtain a frequency-multiplied local oscillator signal, and send the frequency-multiplied local oscillator signal to the first frequency mixer 1024.

The first mixer 1024 is configured to perform frequency mixing processing on the received coupled millimeter wave signal and the frequency-multiplied local oscillator signal to obtain a first intermediate frequency signal, and send the first intermediate frequency signal to the first low-pass filter 1025.

The first low-pass filter 1025 is configured to perform filtering processing on the received first intermediate frequency signal to obtain a filtered first intermediate frequency signal, and send the filtered first intermediate frequency signal to the first amplifier 1026.

The first amplifier 1026 is configured to amplify the received filtered first intermediate frequency signal to obtain a reference intermediate frequency signal, and send the reference intermediate frequency signal to the vector network analyzer 101.

In the embodiment of the present invention, the directional coupler 1023 may be a 2-branch directional coupler, and the 2-branch directional coupler may couple 1-path signal to obtain 2-path signals. The through output port of the 2-minute directional coupler is connected with the transmitting antenna, and then the 2-minute directional coupler can output millimeter wave signals from the through output port and send the millimeter wave signals to the down converter through the transmitting antenna connected with the through output port. The coupling output port of the 2-division directional coupler is connected with the first mixer, and further, the 2-division directional coupler can also send the coupled millimeter wave signal to the first mixer from the coupling output port.

In one implementation, the first frequency multiplier 1021 may perform frequency multiplication on the radio frequency signal sent by the vector network analyzer 101 according to a preset multiple to obtain a millimeter wave signal, and send the millimeter wave signal to the directional coupler 1023.

Directional coupler 1023 may forward the received millimeter wave signal to down converter 106 via transmit antenna 105. The directional coupler 1023 may further perform coupling processing on the millimeter wave signal to obtain a coupled millimeter wave signal, and send the coupled millimeter wave signal to the first mixer 1024. The second frequency multiplier 1022 may perform frequency multiplication on the local oscillation signal sent by the vector network analyzer 101 according to a preset multiple to obtain a frequency-multiplied local oscillation signal, and send the frequency-multiplied local oscillation signal to the first frequency mixer 1024.

The frequency doubling processing multiple of the local oscillator signal by the second frequency multiplier 1022 is the same as the frequency doubling processing multiple of the radio frequency signal by the first frequency multiplier 1021.

The first mixer 1024 may perform frequency mixing processing on the received coupled millimeter wave signal and the frequency-multiplied local oscillator signal to obtain a first intermediate frequency signal, and send the first intermediate frequency signal to the first low-pass filter 1025.

The frequency of the first intermediate frequency signal may be a difference between the frequency of the frequency-doubled local oscillator signal and the frequency of the coupled millimeter wave signal.

First low-pass filter 1025 may filter the received first intermediate frequency signal to obtain a filtered first intermediate frequency signal, and send the filtered first intermediate frequency signal to first amplifier 1026. The first amplifier 1026 may amplify the received filtered first intermediate frequency signal to obtain a reference intermediate frequency signal, and send the reference intermediate frequency signal to the vector network analyzer 101.

In one embodiment of the present invention, referring to fig. 4, the down converter 103 may comprise: a third frequency multiplier 1031, a second mixer 1032, a second low-pass filter 1033 and a second amplifier 1034, wherein the third frequency multiplier 1031 is connected with the vector network analyzer 101 and the second mixer 1032, the second mixer 1032 is connected with the antenna 104 to be tested and the second low-pass filter 1033, the second low-pass filter 1033 is connected with the second amplifier 1034, and the second amplifier 1034 is connected with the vector network analyzer 101.

And a third frequency multiplier 1031, configured to receive the local oscillator signal sent by the vector network analyzer 101, perform frequency multiplication on the local oscillator signal to obtain a frequency-multiplied local oscillator signal, and send the frequency-multiplied local oscillator signal to the second frequency mixer 1032.

The second mixer 1032 is configured to receive the millimeter wave signal sent by the transmission expansion module 102 through the antenna to be tested 104, perform frequency mixing processing on the millimeter wave signal and the frequency-multiplied local oscillator signal to obtain a second intermediate frequency signal, and send the second intermediate frequency signal to the second low-pass filter 1033.

And a second low-pass filter 1033, configured to perform filtering processing on the received second intermediate frequency signal to obtain a filtered second intermediate frequency signal, and send the filtered second intermediate frequency signal to the second amplifier 1034.

The second amplifier 1034 is configured to amplify the received filtered second intermediate frequency signal to obtain a test intermediate frequency signal, and send the test intermediate frequency signal to the vector network analyzer 101.

In this embodiment of the present invention, the multiple of the third frequency multiplier 1031 for frequency multiplying the local oscillator signal is the same as the multiple of the local oscillator signal of the second frequency multiplier 1022 for frequency multiplying.

In an embodiment of the present invention, referring to fig. 5, fig. 5 is a structural diagram of another antenna testing system provided in an embodiment of the present invention, where the antenna testing system includes: the device comprises a vector network analyzer, a power divider, a transmitting expansion module, a down converter, an antenna to be tested and a transmitting antenna.

The connection port of the vector network analyzer may include: 2 RF (Radio Frequency) signal output ports, 1 LO (Local Oscillator) signal output (i.e., LO output) port, and 4 IF (Intermediate Frequency) signal input ports.

Wherein, 2 radio frequency signal output ports are respectively: port1 port and port2 port. Any one of the rf signal output ports (illustrated as port2 in fig. 5) of the vector network analyzer is connected to the rf signal input port of the transmission expansion module through an rf cable. The output port of the local oscillation signal is connected with the input port of the power divider through a radio frequency cable.

The 4 intermediate frequency signal input ports are respectively: a port, B port, C/R1 port, and D/R2 port. An intermediate frequency signal input port (illustrated as an a port in fig. 5) of the vector network analyzer is connected with an intermediate frequency signal output port of the transmission expansion module through a radio frequency cable. Another if signal input port (illustrated as B port in fig. 5) is connected to the if signal output port of the down-converter via a rf cable.

The connection port of the power divider may include: 1 input port and 2 output ports (i.e., output1 and output 2). The input port is connected to the local oscillator signal output port of the vector network analyzer through a radio frequency cable, and the 2 output ports are respectively connected to the local oscillator signal input port of the transmission expansion module and the local oscillator signal input port of the down converter through a radio frequency cable (fig. 5 illustrates that the output1 port is connected to the local oscillator signal input port of the transmission expansion module, and the output2 port is connected to the local oscillator signal input port of the down converter).

The connection port of the transmitting expansion module comprises: 1 radio frequency signal input (i.e., RF input) port, 1 local oscillator signal input (i.e., LO input) port, 1 intermediate frequency signal output (i.e., IF output) port, one waveguide port, and 1 power supply port (not shown in fig. 5).

The rf signal input port is connected to 1 rf signal output port (illustrated as port2 in fig. 5) of the vector network analyzer through an rf cable. The local oscillator signal input port is connected with a local oscillator signal output port of the vector network analyzer through a radio frequency cable. The intermediate frequency signal output port is connected to 1 intermediate frequency signal input port (illustrated as an a port in fig. 5) of the vector network analyzer through a radio frequency cable. The waveguide port is connected with the opening waveguide probe and is connected with the transmitting antenna through the opening waveguide probe. The power supply port (not shown in fig. 5) is connected to a dc power supply.

The connection port of the down converter includes: 1 local oscillator signal input (LO input) port, 1 intermediate frequency signal output (IF output) port, 1 waveguide port.

The local oscillator input port is connected with a local oscillator signal output port of the self-vector network analyzer through a radio frequency cable. The intermediate frequency signal output port is connected to 1 intermediate frequency signal input port (illustrated as B port in fig. 5) of the vector network analyzer through a radio frequency cable. The waveguide port is connected with the open waveguide probe and is connected with the antenna to be tested through the open waveguide probe.

Based on the connection relationship, the vector network analyzer can send the generated radio frequency signal to the transmission expansion module through the port 2. The vector network analyzer can also send the generated local oscillation signal to the power divider through the local oscillation signal output port.

The power divider can receive the local oscillation signals sent by the vector network analyzer through the signal input port, and obtain two paths of same local oscillation signals based on the received local oscillation signals. Then, the local oscillation signal is sent to the transmission expansion module through the signal output port1, and is sent to the down converter through the signal output port 2.

The transmitting and expanding module can receive the radio-frequency signals sent by the vector network analyzer through the radio-frequency signal input port and perform spread spectrum processing on the radio-frequency signals to obtain millimeter-wave signals. And then, sending the millimeter wave signal to the down converter through a transmitting antenna connected with the waveguide port. The transmission expansion module can also receive a local oscillation signal sent by the power divider through the local oscillation signal input port, then the transmission expansion module can perform frequency mixing processing on the radio frequency signal and the local oscillation signal to obtain a reference intermediate frequency signal, and the reference intermediate frequency signal is sent to the vector network analyzer through the intermediate frequency signal output port.

The down converter can receive local oscillation signals sent by the power divider through the local oscillation signal input port, and receive millimeter wave signals sent by the transmitting and expanding module through the transmitting antenna through the to-be-tested antenna connected with the waveguide port. Then, the down converter can perform frequency mixing processing on the millimeter wave signal and the local oscillator signal to obtain a test intermediate frequency signal, and the test intermediate frequency signal is sent to the vector network analyzer through the intermediate frequency signal output port.

The vector network analyzer can receive the reference intermediate frequency signal sent by the transmitting expansion module through the port A and receive the test intermediate frequency signal sent by the down converter through the port B. Then, the vector network analyzer can synthesize the reference intermediate frequency signal and the test intermediate frequency signal to obtain a target signal capable of representing the performance of the antenna to be tested.

Referring to fig. 6, fig. 6 is a structural diagram of a transmitting expansion module according to an embodiment of the present invention, where the transmitting expansion module may include: frequency multiplier 1, frequency multiplier 2, directional coupler, mixer, low pass filter and amplifier. The frequency multiplier 1 is connected with the directional coupler, the frequency multiplier 2 is connected with the frequency mixer, the directional coupler is connected with the frequency mixer, the frequency mixer is connected with the low-pass filter, and the low-pass filter is connected with the amplifier. The frequency multiplier 1 and the frequency multiplier 2 are both N frequency multipliers, and N represents a preset multiple of the frequency multiplier for performing frequency multiplication processing on signals.

The frequency multiplier 1 may receive the radio frequency signal sent by the vector network analyzer, perform frequency multiplication processing on the radio frequency signal to obtain a millimeter wave signal, and send the millimeter wave signal to the directional coupler. The directional coupler can be connected with the transmitting antenna through the open waveguide probe, and can forward the received millimeter wave signal to the down converter through the transmitting antenna, and can perform coupling processing on the millimeter wave signal to obtain a coupled millimeter wave signal, and can send the coupled millimeter wave signal to the mixer.

The frequency multiplier 2 may receive the local oscillation signal sent by the vector network analyzer, perform frequency multiplication processing on the local oscillation signal to obtain a frequency-multiplied local oscillation signal, and send the frequency-multiplied local oscillation signal to the frequency mixer. The mixer may perform frequency mixing processing on the received coupled millimeter wave signal and the frequency-multiplied local oscillator signal to obtain a first intermediate frequency signal, and send the first intermediate frequency signal to the low-pass filter.

The low-pass filter may perform filtering processing on the received first intermediate frequency signal to obtain a filtered first intermediate frequency signal, and send the filtered first intermediate frequency signal to the amplifier. The amplifier may amplify the received filtered first intermediate frequency signal to obtain a reference intermediate frequency signal, and send the reference intermediate frequency signal to the vector network analyzer.

In one embodiment of the present invention, the user can preset the parameters of the vector network analyzer in the following 2 ways.

In the first mode, a user can set the mode of receiving the intermediate-frequency signal by the vector network analyzer.

For example, the user may click on the Trace button in the Trace/Channel operating area of the vector network analyzer before clicking on the Channel button in the Trace/Channel operating area. The vector network analyzer may display a first setup interface. The user may click a button corresponding to Hardware Setup in the first Setup interface. The vector network analyzer may display a second settings interface. The user may click a button corresponding to Config in the second setting interface.

The vector network analyzer may display an IF patch Configuration Channel 1 (intermediate frequency Channel setup) setup interface. The user can modify Internal in the IF Input (intermediate frequency Input) column corresponding to each of A, B, R1 and R2 in the IF patch Configuration Channel 1 setting interface to External, and click OK to save.

Based on the above operation, the vector network analyzer may determine that the intermediate frequency signal is input by the connected transmit spreading module and down converter.

The user can also set the frequency offset of Source (signal transmitting end), Receivers (signal receiving end) and test frequency band. In the embodiment of the invention, the signal sending end consists of a vector network analyzer, a power divider and a transmitting expansion module in the antenna test system. The signal receiving end is composed of a vector network analyzer and a down converter in the antenna test system.

For example, the user may first click on the Freq button of the Stimulus operating area of the vector web analyzer. The vector network analyzer may display a third settings interface. The user may click a button corresponding to Frequency in the third setting interface. The vector network analyzer may display a fourth settings interface. The user can click a Frequency Offset Mode button in the fourth setting interface. The vector network analyzer may display a Frequency Offset Channel 1 (Frequency Offset Channel) setting interface.

The user can click on the Source button in the Frequency Offset Channel 1 setup interface. The vector network analyzer can display a Source setting interface, and a user can click a Coupled button corresponding to a Mode column in the Source setting interface and then click an Edit button corresponding to a Settings column. The vector network analyzer can display a divsor (frequency division factor) setting interface corresponding to the Source. Accordingly, if it is desired to generate a millimeter wave signal of 40GHz to 60GHz, the user may set the division factor to 4. If it is desired to generate millimeter wave signals of 60GHz to 90GHz, the user may set the division factor to 6. If it is desired to generate a 90GHz to 110GHz millimeter wave signal, the user may set the division factor to 6.

The user can click a Receivers button in the Frequency Offset Channel 1 setting interface, the vector network analyzer can display the Receivers setting interface, the user can click a Coupled button corresponding to a Mode column in the Receivers setting interface, and then click an Edit button corresponding to a Settings column. The vector network analyzer can display a divsor setting interface corresponding to Receivers. Accordingly, if it is desired to generate a millimeter wave signal of 40GHz to 60GHz, the user may set the division factor to 4. If it is desired to generate millimeter wave signals of 60GHz to 90GHz, the user may set the division factor to 6. If it is desired to generate a 90GHz to 110GHz millimeter wave signal, the user may set the division factor to 6.

The user can check the selection frame corresponding to the Frequency Offset (ON/OFF) in the Frequency Offset Channel 1 setting interface, and then click the Edit button corresponding to the setup column corresponding to Primary. The vector network analyzer can display a test frequency band setting interface. Accordingly, the user can set a Start frequency and a Stop frequency in the test band setting interface, respectively. For example, millimeter wave signals of 40GHz to 60GHz need to be generated, and the start frequency may be set to 40GHz and the end frequency may be set to 60GHz, respectively.

The user may also set the Display type of the X Axis when the vector network analyzer displays the waveform diagram, for example, the user may set an annotation under an X-Axis Display menu in the Frequency Offset Channel 1 setting interface to Primary, and the vector network analyzer may determine the Display type of the X Axis as the test band.

The user can also set the mode of the vector network analyzer for displaying the test result. The intermediate frequency signal output port of the transmitting expansion module is connected to the port a of the vector network analyzer, and the intermediate frequency signal output port of the down converter is connected to the port B of the vector network analyzer.

The user can click the Trace button of the Trace/Channel operation area of the vector network analyzer first, and the vector network analyzer can display a corresponding fifth setting interface. The user may click on the New Trace button in the fifth setup interface. The vector network analyzer may display a New Trace setup interface. The user can click a button corresponding to Receivers in the New Trace setting interface. The vector network analyzer can display a Receivers setting interface. The user can check a selection box corresponding to the active of the 1 st line in the Receivers menu in the Receivers setting interface, set the Numerator corresponding to the active of the 1 st line as B, set the Denominator corresponding to the active of the 1 st line as A, set the Source Port2 corresponding to the active of the 1 st line, and then click OK for storage.

Based on the above operation, the vector network analyzer may determine to perform synthesis processing on the test intermediate frequency signal received by the port B and the reference intermediate frequency signal received by the port a to obtain a target signal, and display a waveform of the target signal. In addition, the vector network analyzer can also display a Tr 1B/A, 2 identifier, wherein the corresponding waveform of the Tr 1B/A, 2 identifier is the waveform of the target signal, the parameter of the waveform of the target signal is the ratio of the parameter of the test intermediate frequency signal to the corresponding parameter of the reference intermediate frequency signal (namely, the S21 parameter), and the S21 parameter can represent the transmission performance of the antenna to be tested. The vector network analyzer may also determine that the generated radio frequency signal is to be sent to the transmit expansion module through the Port2 Port.

Or, the user may click the Trace button of the Trace/Channel operation area of the vector network analyzer first, and the vector network analyzer may display the corresponding fifth setting interface. The user can click a button corresponding to the New Trace in the fifth setting interface. The vector network analyzer may display a New Trace setup interface. The user can click a button corresponding to Receivers in the New Trace setting interface. The vector network analyzer can display a Receivers setting interface. The user can check a selection box corresponding to the active of the 2 nd row under the Receivers menu in the Receivers setting interface, set the number corresponding to the active of the 2 nd row as B, set the Denominator corresponding to the active of the 2 nd row as 1.0, set the Source Port corresponding to the active of the 2 nd row as Port2, and then click OK for storage.

Based on the above operation, the vector network analyzer may determine a waveform showing the test intermediate frequency signal received by the B port. In addition, the vector network analyzer can also display the Tr 2B, 2 mark, and the Tr 2B, 2 mark corresponds to the waveform of the test intermediate frequency signal received by the port B. The vector network analyzer may also determine that the generated radio frequency signal is to be sent to the transmit expansion module through the Port2 Port.

The user can click the Trace button of the Trace/Channel operation area of the vector network analyzer first, and the vector network analyzer can display a corresponding fifth setting interface. The user can click a button corresponding to the New Trace in the fifth setting interface. The vector network analyzer may display a New Trace setup interface. The user can click a button corresponding to Receivers in the New Trace setting interface, the vector network analyzer can display the Receivers setting interface, the user can select a selection frame corresponding to the Activate of the 1 st row under the Receivers menu in the Receivers setting interface, the number corresponding to the Activate of the 1 st row is set as A, the Denominator corresponding to the Activate of the 1 st row is set as 1.0, the Source Port corresponding to the Activate of the 1 st row is set as Port2, and then OK is clicked for storage.

Based on the above operation, the vector network analyzer may determine a waveform showing the reference intermediate frequency signal received by the a port. In addition, the vector network analyzer can also display the identifier Tr 3A and 2, and the identifier Tr 3A and 2 corresponds to the waveform of the reference intermediate frequency signal received by the port A. The vector network analyzer may also determine that the generated radio frequency signal is to be sent to the transmit expansion module through the Port2 Port.

Subsequently, the technician can read the parameters of the reference if signal and the parameters of the test if signal, respectively. Then, a ratio of the parameter of the test intermediate frequency signal to the parameter of the reference intermediate frequency signal may be calculated, and the S21 parameter of the antenna to be tested may be obtained.

The second method comprises the following steps: the difference value between the frequency of the local oscillation signal generated by the vector network analyzer and the frequency of the radio frequency signal is a fixed frequency offset. When determining the frequency of the radio frequency signal generated by the vector network analyzer, the vector network analyzer can generate a corresponding local oscillator signal as long as a fixed frequency offset is set.

For example, the user may click on the Trace button of the Trace/Channel operation area of the vector network analyzer, and then click on the Channel button of the Trace/Channel operation area, and the vector network analyzer may display the first setting interface. The user may click a button corresponding to Hardware Setup in the first setting interface, and then click a button corresponding to IF Config (intermediate frequency configuration) in the first setting interface. Accordingly, the vector network analyzer may display the IF patch Configuration Channel 1 setup interface. The user can modify Internal in the IF input column corresponding to each of A, B, R1 and R2 in the IF patch Configuration Channel 1 setting interface to External, and click OK to save.

The user can click the Trace button of the Trace/Channel operation area of the vector network analyzer, and the vector network analyzer can display a fifth setting interface. And the user can click a button corresponding to the New Trace in the fifth setting interface, and the vector network analyzer can display the New Trace setting interface. The user can click a button corresponding to Receivers in the New Trace setting interface, the vector network analyzer can display the Receivers setting interface, the user can select a selection frame corresponding to the Activate in the 1 st row under the Receivers menu in the Receivers setting interface, the number corresponding to the Activate in the 1 st row is set as B, the Denominator corresponding to the Activate in the 1 st row is set as A, the Source Port corresponding to the Activate in the 1 st row is set as Port2, and then OK is clicked for storage.

Based on the above operation, the vector network analyzer may perform synthesis processing on the test intermediate frequency signal received by the port B and the reference intermediate frequency signal received by the port a to obtain a target signal, and display a waveform of the target signal. In addition, the vector network analyzer can also display the identifier Tr 1B/A, 2, wherein the identifier Tr 1B/A, 2 corresponds to the waveform of the target signal, and the parameter of the waveform of the target signal is the ratio of the parameter of the test intermediate frequency signal to the corresponding parameter of the reference intermediate frequency signal (i.e. the parameter S21). The vector network analyzer may also determine that the generated radio frequency signal is to be sent to the transmit expansion module through the Port2 Port.

Or, the user may click the Trace button of the Trace/Channel operation area of the vector network analyzer first, and the vector network analyzer may display the fifth setting interface. And the user can click a button corresponding to the New Trace in the fifth setting interface, and the vector network analyzer can display the New Trace setting interface. The user can click a button corresponding to Receivers in the New Trace setting interface, the vector network analyzer can display the Receivers setting interface, the user can select a selection frame corresponding to the Activate in the 2 nd row under the Receivers menu in the Receivers setting interface, the number corresponding to the Activate in the 2 nd row is set as B, the Denominator corresponding to the Activate in the 2 nd row is set as 1.0, the Source Port corresponding to the Activate in the 2 nd row is set as Port2, and then OK is clicked for storage.

The user can click the Trace button of the Trace/Channel operation area of the vector network analyzer first, and the vector network analyzer can display a fifth setting interface. And the user can click a button corresponding to the New Trace in the fifth setting interface, and the vector network analyzer can display the New Trace setting interface. The user can click a button corresponding to Receivers in the New Trace setting interface, the vector network analyzer can display the Receivers setting interface, the user can select a selection frame corresponding to the Activate of the 1 st row under the Receivers menu in the Receivers setting interface, the number corresponding to the Activate of the 1 st row is set as A, the Denominator corresponding to the Activate of the 1 st row is set as 1.0, the Source Port corresponding to the Activate of the 1 st row is set as Port2, and then OK is clicked for storage.

The user may click on the Freq button in the stylus operation area, and then click on the Sweep button in the stylus operation area, the vector network analyzer may display the sixth setting interface, the user may click on the Sweep Type button in the sixth setting interface, the vector network analyzer may display the seventh setting interface, and then click on the CW Time (Continuous Wave Time) button in the seventh setting interface. The Freq button in the Stimulus operating area, the vector network analyzer may display the CW Frequency setup interface. The user can input the Frequency (e.g., 11GHz) of the generated radio Frequency signal in a CW Frequency setting interface.

Then, the user can click on the Receivers Offset Channel 1 button, and the vector network analyzer can display the Frequency Offset Channel 1 setup interface. The user can click the Edit button corresponding to the Settings column corresponding to Receivers. The vector network analyzer may display a receivers (coupled) setup interface. The user may set the Offset value in the receivers (coupled) settings interface to-0.006198247 GHz and then click OK to save.

Based on the above operation, the vector network analyzer may generate a radio frequency signal with a frequency of 11GHz and generate a local oscillator signal with a frequency of 11.0012396 GHz.

Corresponding to the antenna test system in fig. 1, referring to fig. 7, fig. 7 is a flowchart of an antenna test method according to an embodiment of the present invention, the method is applied to the antenna test system, and the antenna test system includes: the vector network analyzer is connected with the transmitting expansion module and the down converter, the transmitting expansion module is connected with the transmitting antenna, and the down converter is connected with the antenna to be tested, and the method can comprise the following steps:

s701: the vector network analyzer generates a radio frequency signal and sends the radio frequency signal to the transmitting expansion module; generating local oscillation signals, and respectively sending the local oscillation signals to the transmission expansion module and the down converter;

s702: the transmitting expansion module performs frequency multiplication on the received radio frequency signal to obtain a millimeter wave signal, and sends the millimeter wave signal to the down converter through the transmitting antenna; performing frequency mixing processing on the received radio frequency signal and the local oscillator signal to obtain a reference intermediate frequency signal, and sending the reference intermediate frequency signal to a vector network analyzer;

s703: the down converter receives the millimeter wave signal sent by the transmitting expansion module through the antenna to be tested, performs frequency mixing processing on the millimeter wave signal and the local oscillator signal to obtain a test intermediate frequency signal, and sends the test intermediate frequency signal to the vector network analyzer;

s704: and the vector network analyzer synthesizes the received reference intermediate frequency signal and the test intermediate frequency signal to obtain a target signal capable of expressing the performance of the antenna to be tested.

the vector network analyzer generates local oscillation signals and respectively sends the local oscillation signals to the emission extension module and the down converter, and the method comprises the following steps:

the vector network analyzer generates a local oscillation signal and sends the local oscillation signal to the power divider;

Optionally, the transmitting expansion module includes: the frequency multiplier comprises a first frequency multiplier, a second frequency multiplier, a directional coupler, a first frequency mixer, a first low-pass filter and a first amplifier; the first frequency multiplier is connected with the vector network analyzer and the directional coupler, the second frequency multiplier is connected with the vector network analyzer and the first frequency mixer, the directional coupler is connected with the transmitting antenna and the first frequency mixer, the first frequency mixer is connected with the first low-pass filter, the first low-pass filter is connected with the first amplifier, and the first amplifier is connected with the vector network analyzer;

the transmitting expansion module performs frequency multiplication on the received radio frequency signal to obtain a millimeter wave signal, and sends the millimeter wave signal to the down converter through the transmitting antenna; and performing frequency mixing processing on the received radio frequency signal and the local oscillator signal to obtain a reference intermediate frequency signal, and sending the reference intermediate frequency signal to the vector network analyzer, wherein the frequency mixing processing method comprises the following steps:

the directional coupler forwards the received millimeter wave signal to the down converter through the transmitting antenna, couples the millimeter wave signal to obtain a coupled millimeter wave signal, and sends the coupled millimeter wave signal to the first mixer;

the second frequency multiplier receives the local oscillator signal sent by the vector network analyzer, performs frequency multiplication processing on the local oscillator signal to obtain a frequency-multiplied local oscillator signal, and sends the frequency-multiplied local oscillator signal to the first frequency mixer;

the first low-pass filter carries out filtering processing on the received first intermediate-frequency signal to obtain a filtered first intermediate-frequency signal, and sends the filtered first intermediate-frequency signal to the first amplifier;

the first amplifier amplifies the received filtered first intermediate frequency signal to obtain a reference intermediate frequency signal, and sends the reference intermediate frequency signal to the vector network analyzer.

Optionally, the down converter includes: the third frequency multiplier is connected with the vector network analyzer and the second frequency mixer, the second frequency mixer is connected with the antenna to be tested and the second low-pass filter, the second low-pass filter is connected with the second amplifier, and the second amplifier is connected with the vector network analyzer;

the down converter carries out mixing processing to received millimeter wave signal and local oscillator signal, obtains test intermediate frequency signal to send test intermediate frequency signal to vector network analyzer, include:

the third frequency multiplier receives the local oscillator signal sent by the vector network analyzer, performs frequency multiplication processing on the local oscillator signal to obtain a frequency-multiplied local oscillator signal, and sends the frequency-multiplied local oscillator signal to the second frequency mixer;

the second mixer receives the millimeter wave signal sent by the transmitting and expanding module through the antenna to be tested, performs frequency mixing processing on the millimeter wave signal and the frequency-multiplied local oscillator signal to obtain a second intermediate frequency signal, and sends the second intermediate frequency signal to the second low-pass filter;

and the second amplifier amplifies the received filtered second intermediate frequency signal to obtain a test intermediate frequency signal and sends the test intermediate frequency signal to the vector network analyzer.

Based on the antenna testing method provided by the embodiment of the invention, the emission extension module can carry out frequency doubling processing on the radio-frequency signal generated by the vector network analyzer, so that the frequency of the radio-frequency signal is improved, and further, a millimeter wave signal can be obtained. Accordingly, a target signal representing the performance of the antenna to be tested can be obtained based on the millimeter wave signal. In addition, the antenna test system has fewer devices and low device cost, and can reduce the complexity and cost of antenna test.

In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When loaded and executed on a computer, cause the processes or functions described in accordance with the embodiments of the invention to occur, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, from one website site, computer, server, or data center to another website site, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that incorporates one or more of the available media. The usable medium may be a magnetic medium (e.g., floppy Disk, hard Disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

All the embodiments in the present specification are described in a related manner, and the same and similar parts among the embodiments may be referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, as for the method embodiment, since it is basically similar to the method embodiment, the description is simple, and the relevant points can be referred to the partial description of the method embodiment.

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.

Claims

1. An antenna test system, characterized in that the antenna test system comprises: the device comprises a vector network analyzer, a transmitting expansion module, a down converter, an antenna to be tested and a transmitting antenna, wherein the vector network analyzer is connected with the transmitting expansion module and the down converter, the transmitting expansion module is connected with the transmitting antenna, and the down converter is connected with the antenna to be tested, wherein:

2. The antenna test system of claim 1, further comprising a power divider; the power divider is connected with the vector network analysis module, the transmitting expansion module and the down converter;

3. The antenna test system of claim 1, wherein the transmit expansion module comprises: the vector network analyzer comprises a first frequency multiplier, a second frequency multiplier, a directional coupler, a first mixer, a first low-pass filter and a first amplifier, wherein the first frequency multiplier is connected with the vector network analyzer and the directional coupler, the second frequency multiplier is connected with the vector network analyzer and the first mixer, the directional coupler is connected with the transmitting antenna and the first mixer, the first mixer is connected with the first low-pass filter, the first low-pass filter is connected with the first amplifier, and the first amplifier is connected with the vector network analyzer;

4. The antenna test system of claim 1, wherein the down converter comprises: the vector network analyzer comprises a third frequency multiplier, a second mixer, a second low-pass filter and a second amplifier, wherein the third frequency multiplier is connected with the vector network analyzer and the second mixer, the second mixer is connected with the antenna to be tested and the second low-pass filter, the second low-pass filter is connected with the second amplifier, and the second amplifier is connected with the vector network analyzer;

5. An antenna test method is applied to an antenna test system, and the antenna test system comprises the following steps: the device comprises a vector network analyzer, a transmitting expansion module, a down converter, an antenna to be tested and a transmitting antenna, wherein the vector network analyzer is connected with the transmitting expansion module and the down converter, the transmitting expansion module is connected with the transmitting antenna, and the down converter is connected with the antenna to be tested, and the method comprises the following steps:

6. The method of claim 5, wherein the antenna test system further comprises a power divider; the power divider is connected with the vector network analysis module, the transmitting expansion module and the down converter;

7. The method of claim 5, wherein the transmit spreading module comprises: the frequency multiplier comprises a first frequency multiplier, a second frequency multiplier, a directional coupler, a first frequency mixer, a first low-pass filter and a first amplifier; the first frequency multiplier is connected with the vector network analyzer and the directional coupler, the second frequency multiplier is connected with the vector network analyzer and the first mixer, the directional coupler is connected with the transmitting antenna and the first mixer, the first mixer is connected with the first low-pass filter, the first low-pass filter is connected with the first amplifier, and the first amplifier is connected with the vector network analyzer;

8. The method of claim 5, wherein the downconverter comprises: the vector network analyzer comprises a third frequency multiplier, a second mixer, a second low-pass filter and a second amplifier, wherein the third frequency multiplier is connected with the vector network analyzer and the second mixer, the second mixer is connected with the antenna to be tested and the second low-pass filter, the second low-pass filter is connected with the second amplifier, and the second amplifier is connected with the vector network analyzer;