Liquid crystal phase shifter response time test system and test method

Abstract

The present invention discloses a liquid crystal phase shifter response time test system and test method, wherein the liquid crystal phase shifter is used to shift the phase of a test signal based on a bias voltage, including: a host computer for generating a control signal; a voltage driving module for generating a bias voltage based on the control signal; a network analyzer for generating a test signal based on the control signal, and sending the phase information of the output signal of the liquid crystal phase shifter to the host computer; a test module for shifting the test signal to a specified phase and generating a reference signal, synthesizing the output signal of the liquid crystal phase shifter with the reference signal and generating a synthesized signal, and obtaining the response time of the liquid crystal phase shifter according to the stabilization time of the synthesized signal. The liquid crystal phase shifter response time test system and test method of the present invention, by synthesizing the output signal and the reference signal of the liquid crystal phase shifter, converts the phase information of the liquid crystal phase shifter into a voltage signal, and conveniently and quickly measures the response time.

Description

Technical Field

[0001] The invention belongs to the technical field of liquid crystal phase shifters, and in particular relates to a liquid crystal phase shifter response time testing system and a testing method. Background Art

[0002] Liquid crystal is a material with special properties between solid and liquid states. Its molecules are still directional like solid crystals, but can also flow like liquids. Liquid crystal materials are composed of anisotropic molecules, and the intermolecular forces make liquid crystal materials non-uniform in all directions. A phase shifter is an electronic device or circuit used to change the phase of a signal. It can shift the phase of an input signal to adjust the phase of the signal. Phase shifters are widely used in microwave circuits, but the most important application is in phased array antenna systems. Liquid crystal phase shifters have significant advantages such as small size, high convenience, low power consumption, and low manufacturing cost. They provide an effective solution for the design of low-cost and low-power phased array antennas and are emerging technologies with development potential. The response time of a liquid crystal phase shifter is an important indicator of a liquid crystal phase shifter. Traditional methods use optical methods and cannot test the phase of a liquid crystal phase shifter. Therefore, in view of the above technical problems, it is necessary to provide a liquid crystal phase shifter response time test system and test method.

[0003] The information disclosed in this background technology section is only intended to enhance the understanding of the overall background of the invention and should not be regarded as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art. Summary of the invention

[0004] The object of the present invention is to provide a liquid crystal phase shifter response time testing system and testing method, which can convert the phase information of the liquid crystal phase shifter into a voltage signal through signal synthesis, so as to conveniently and quickly measure the response time of the liquid crystal phase shifter.

[0005] In order to achieve the above object, a technical solution provided by a specific embodiment of the present invention is as follows:

[0006] A liquid crystal phase shifter response time test system, wherein the liquid crystal phase shifter is used to shift the phase of a test signal based on a bias voltage, and comprises: a host computer, used to generate a control signal; a voltage driving module, used to generate a bias voltage based on the control signal; a network analyzer, used to generate a test signal based on the control signal, and send the phase information of the output signal of the liquid crystal phase shifter to the host computer, wherein the host computer is used to establish a mapping relationship between the bias voltage and the shift phase of the liquid crystal phase shifter; a test module, used to shift the test signal by a specified phase and generate a reference signal, synthesize the output signal of the liquid crystal phase shifter with the reference signal and generate a synthesized signal, and obtain the response time of the liquid crystal phase shifter according to the stabilization time of the synthesized signal.

[0007] In one or more embodiments of the present invention, the test module includes: a signal generator for generating a test signal based on a control signal; a phase shifter for shifting the test signal to a specified phase and generating a reference signal; a signal synthesis module for synthesizing the output signal of the liquid crystal phase shifter with the reference signal and generating a synthesized signal, and generating a voltage signal based on the synthesized signal; an oscilloscope for analyzing the time required for the voltage signal to reach a stable state, the first input terminal of the oscilloscope being used to receive the control signal, and the second input terminal of the oscilloscope being used to receive the voltage signal.

[0008] In one or more embodiments of the present invention, the test module also includes a power divider for dividing the test signal into two test signals, the input end of the power divider is used to receive the test signal, the first output end of the power divider is connected to the input end of the liquid crystal phase shifter, and the second output end of the power divider is connected to the input end of the phase shifter.

[0009] In one or more embodiments of the present invention, the network analyzer is further used to analyze the power of the synthesized signal and send the power data of the synthesized signal to a host computer.

[0010] In one or more embodiments of the present invention, the signal synthesis module includes an adjustable attenuator, a combiner, a detector, a first switch, a second switch, a control module and an output port, the input end of the adjustable attenuator is connected to the output end of the phase shifter, the output end of the adjustable attenuator is connected to the first input end of the combiner to adjust the size of the reference signal, the second input end of the combiner is connected to the output end of the liquid crystal phase shifter, the output end of the combiner is connected to the first end of the first switch to generate a synthesized signal, the second end of the first switch is connected to the input end of the detector, the output end of the detector is connected to the second end of the second switch to output a voltage signal based on the synthesized signal, the first end of the second switch is connected to the output port, the third end of the first switch is connected to the third end of the second switch, and the control module is used to control the on and off of the first switch and the second switch based on the control signal.

[0011] In one or more embodiments of the present invention, the combiner is a 90° 3dB bridge, the signal synthesis module also includes a load, the first output end of the 90° 3dB bridge is connected to the first end of the first switch to generate a synthetic signal, and the second output end of the 90° 3dB bridge is connected to the load.

[0012] A specific embodiment of the present invention also provides a liquid crystal phase shifter response time test method, based on the above-mentioned liquid crystal phase shifter response time test system, the method includes: generating a control signal through a host computer; generating a bias voltage based on the control signal through a voltage driving module; generating a test signal based on the control signal through a network analyzer, and sending the output signal phase information of the liquid crystal phase shifter to the host computer; establishing a mapping relationship between the bias voltage and the phase shift of the liquid crystal phase shifter through the host computer; shifting the test signal to a specified phase and generating a reference signal through a test module, synthesizing the output signal of the liquid crystal phase shifter with the reference signal and generating a synthesized signal, and obtaining the response time of the liquid crystal phase shifter according to the stabilization time of the synthesized signal.

[0013] In one or more embodiments of the present invention, the method of shifting the test signal to a specified phase and generating a reference signal through a test module includes configuring a phase shifter, generating a test signal through a signal generator, shifting the test signal to a specified phase through the phase shifter and generating a reference signal, and the configuration of the phase shifter includes: generating a test signal based on a control signal through a network analyzer; shifting the test signal to a phase to be tested through a liquid crystal phase shifter; shifting the phase of the test signal through the phase shifter and generating a reference signal; synthesizing the output signal of the liquid crystal phase shifter with the reference signal through a combiner and generating a synthesized signal; connecting the output end of the combiner to the output port through a first switch and a second switch; analyzing the power of the synthesized signal through a network analyzer, and adjusting the phase shifter so that the phase of the phase shifter reaches the specified phase.

[0014] In one or more embodiments of the present invention, the phase difference between the designated phase and the phase to be tested is 180°, and the phase of the phase shifter reaches the designated phase when the power of the synthetic signal is the minimum power.

[0015] In one or more embodiments of the present invention, obtaining the response time of the liquid crystal phase shifter according to the stabilization time of the synthesized signal includes: connecting the output end of the combiner to the input end of the detector through a first switch, and connecting the output end of the detector to the output port through a second switch; generating a control signal through a host computer, and generating a bias voltage through a voltage driving module; phase shifting the test signal through a liquid crystal phase shifter; synthesizing the output signal of the liquid crystal phase shifter with a reference signal through a signal synthesis module to generate a synthesized signal, and generating a voltage signal based on the synthesized signal; and analyzing the time required for the voltage signal to reach a stable state through an oscilloscope.

[0016] Compared with the prior art, the liquid crystal phase shifter response time test system and test method of the present invention, by synthesizing the output signal and reference signal of the liquid crystal phase shifter, converts the phase information of the liquid crystal phase shifter into a voltage signal through signal synthesis, thereby conveniently and quickly measuring the response time of the liquid crystal phase shifter. It is also possible to test the response time of the liquid crystal phase shifter at different phase shift phases based on the mapping relationship between the bias voltage and the phase shift phase. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 4 is a system structure diagram for establishing a mapping relationship between a bias voltage and a phase shift phase in an embodiment of the present invention.

[0019] Figure 2 FIG. 4 is a diagram showing the structure of a system for testing the response time of a liquid crystal phase shifter according to an embodiment of the present invention.

[0020] Figure 3 FIG. 4 is a structural diagram of a phase shifting and synthesis module in one embodiment of the present invention.

[0021] Figure 4 FIG. 4 is a system structure diagram when a phase shifter is configured in one embodiment of the present invention.

[0022] Figure 5 FIG. 4 is a flow chart of a method for testing response time of a liquid crystal phase shifter according to an embodiment of the present invention.

[0023] Figure 6 The figure is a flow chart of a method for configuring a phase shifter in one embodiment of the present invention.

[0024] Figure 7 FIG. 4 is a mapping diagram of a liquid crystal phase shifter bias voltage and a phase shift value in an embodiment of the present invention. DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0026] The term "coupled" or "connected" or "connected" in the specification includes both direct connection and indirect connection. Indirect connection is a connection through an intermediate medium, such as a connection through an electrically conductive medium, which may have parasitic inductance or parasitic capacitance; indirect connection may also include connection through other active or passive devices on the basis of achieving the same or similar functional purpose, such as connection through circuits or components such as switches and follower circuits. In addition, in the present invention, words such as "first" and "second" are mainly used to distinguish one technical feature from another technical feature, and do not necessarily require or imply that there is a certain actual relationship, quantity or order between these technical features.

[0027] like Figures 1 to 3 As shown, a liquid crystal phase shifter response time test system in an embodiment of the present invention includes a liquid crystal phase shifter 10, a host computer 20, a voltage driving module 30, a network analyzer 40 and a test module. The liquid crystal phase shifter 10 is used to shift the phase of the test signal based on the bias voltage Vth. The host computer 20 is used to generate a control signal. The voltage driving module 30 is used to generate a bias voltage Vth based on the control signal. The test module is used to shift the test signal to a specified phase and generate a reference signal, synthesize the output signal of the liquid crystal phase shifter 10 with the reference signal and generate a synthesized signal, and obtain the response time of the liquid crystal phase shifter 10 according to the stabilization time of the synthesized signal.

[0028] In practical applications, the mapping relationship between the bias voltage and the phase shift of the liquid crystal phase shifter can be established by testing the liquid crystal phase shifter 10, the host computer 20, the voltage driving module 30 and the network analyzer 40. Figure 1 As shown, first, the host computer 20 sends a control signal to control the voltage driving module 30 to generate periodic positive and negative pulse voltages as the bias voltage Vth of the liquid crystal phase shifter 10. The liquid crystal phase shifter 10 shifts the test signal generated by the network analyzer 40 under the action of the bias voltage Vth. After receiving the output signal of the liquid crystal phase shifter 10, the network analyzer 40 sends the phase data of the signal to the host computer 20. The liquid crystal phase shifter response time test software built into the host computer 20 records the phase shift of the liquid crystal phase shifter 10 corresponding to the bias voltage Vth, and the mapping relationship between the bias voltage Vth and the phase shift is obtained and the data is automatically saved. Figure 7 As shown, a mapping relationship between the liquid crystal phase shifter bias voltage Vth and the phase shift value under three test signals of different frequencies is established.

[0029] like Figures 2 to 3As shown, the test module includes a power divider 51, a phase shifter 52, a signal generator 60, an oscilloscope 70 and a signal synthesis module. The signal synthesis module specifically includes an adjustable attenuator 53, a combiner 54, a control module 55, a first switch 56, a detector 57, a second switch 58 and an output port OUT, and the first switch 56 and the second switch 58 are both single-pole double-throw switches.

[0030] Specifically, the signal generator 60 is used to generate a test signal based on a control signal. The power distributor 51 is used to divide the test signal into two test signals and send them to the liquid crystal phase shifter 10 and the phase shifter 52 respectively. The input end of the power distributor 51 is used to receive the test signal. The first output end of the power distributor 51 is connected to the input end of the liquid crystal phase shifter 10, and the second output end of the power distributor 51 is connected to the input end of the phase shifter 52; the phase shifter 52 is used to shift the test signal to a specified phase and generate a reference signal. The signal synthesis module is used to synthesize the output signal of the liquid crystal phase shifter 10 with the reference signal and generate a synthesized signal, and to generate a voltage signal based on the synthesized signal. The oscilloscope 70 is used to analyze the time required for the voltage signal to reach a stable state. The first input end of the oscilloscope 70 is used to receive the control signal, and the second input end of the oscilloscope 70 is used to receive the voltage signal.

[0031] The input end of the adjustable attenuator 53 is connected to the output end of the phase shifter 52, and the output end of the adjustable attenuator 53 is connected to the first input end of the combiner 54 to adjust the size of the reference signal. The second input end of the combiner 54 is connected to the output end of the liquid crystal phase shifter 10, and the output end of the combiner 54 is connected to the first end of the first switch 56 to generate a composite signal, the second end of the first switch 56 is connected to the input end of the detector 57, and the output end of the detector 57 is connected to the second end of the second switch 58 to output a voltage signal based on the composite signal, the first end of the second switch 58 is connected to the output port OUT, and the third end of the first switch 56 is connected to the third end of the second switch 58. The control module 55 is used to control the on and off of the first switch 56 and the second switch 58 based on the control signal.

[0032] The combiner 54 may be a 90° 3dB bridge, and the signal synthesis module further includes a load 59 , wherein the first output end of the 90° 3dB bridge is connected to the first end of the first switch 56 to generate a synthesis signal, and the second output end of the 90° 3dB bridge is connected to the load 59 .

[0033] In one embodiment, the power distributor 51, the phase shifter 52 and the signal synthesis module can be combined to form a phase shift and synthesis module 50, the input end of the power distributor 51 is used to form the first input end IN1 of the phase shift and synthesis module 50, the first output end of the power distributor 51 is used to form the first output end OUT-LCD of the phase shift and synthesis module 50, the second input end of the combiner 54 is used to form the second input end IN2 of the phase shift and synthesis module 50, and the output port OUT is used to form the second output end OUT of the phase shift and synthesis module 50. The power distributor 51, the phase shifter 52 and the signal synthesis module are combined to form a fixed phase shift and synthesis module 50, which is conducive to testing the response time of the liquid crystal phase shifter 10, facilitating the test personnel to assemble and wire, reducing the difficulty of testing, and shortening the testing time.

[0034] like Figure 5 As shown, the liquid crystal phase shifter response time test method includes: generating a control signal through a host computer 20; generating a bias voltage Vth based on the control signal through a voltage driving module 30; generating a test signal based on the control signal through a network analyzer 40, and sending the output signal phase information of the liquid crystal phase shifter 10 to the host computer 20; establishing a mapping relationship between the bias voltage Vth of the liquid crystal phase shifter and the phase shift phase through the host computer 20; shifting the test signal to a specified phase and generating a reference signal through a test module, synthesizing the output signal of the liquid crystal phase shifter 10 with the reference signal and generating a synthesized signal, and obtaining the response time of the liquid crystal phase shifter 10 according to the stabilization time of the synthesized signal.

[0035] Specifically, in the actual test process, the host computer 20 first generates a control signal to control the signal source to generate a test signal. The test signal is divided into two paths by the power divider 51 and transmitted to the liquid crystal phase shifter 10 and the phase shifter 52 respectively. At this time, the liquid crystal phase shifter 10 has not been applied with the bias voltage Vth, so the phase shift has not started. The liquid crystal phase shifter 10 will output the unshifted test signal to the second input end of the combiner 54. At the same time, the phase shifter 52 shifts the test signal to the specified phase ψ1 and generates a reference signal. The reference signal is input to the first input end of the combiner 54 after amplitude modulation by the adjustable attenuator 53. The combiner 54 synthesizes the two signals with a phase difference of ψ1 and outputs them to the detector 57 through the first switch 56. The detector 57 generates a voltage signal based on the synthesized signal, and outputs the voltage signal through the second switch 58. Finally, the voltage signal waveform is received and displayed by the oscilloscope 70.

[0036] Next, the voltage driving module 30 generates a bias voltage Vth under the control of the control signal, and the liquid crystal phase shifter 10 starts to shift the test signal. Since the mapping relationship between the bias voltage Vth and the phase shift phase has been obtained, the size of the bias voltage Vth can be selected according to the required phase ψ2 to be tested. The system of this scheme can complete the response time test of the liquid crystal phase shifter at any phase. After a period of time, the liquid crystal phase shifter 10 completes the phase shift. During the phase shift, the phase of the output signal of the liquid crystal phase shifter 10 continues to change, which causes the amplitude and power of the synthetic signal generated by the synthesis of the output signal of the liquid crystal phase shifter 10 and the reference signal to change synchronously. Until the liquid crystal phase shifter 10 completes the phase shift, the synthetic signal stabilizes, and the voltage signal generated based on the synthetic signal also stabilizes. Since the first input terminal of the oscilloscope 70 is also used to receive the control signal, the control signal and the voltage signal can be intuitively compared on the oscilloscope 70. At this time, the time difference between the time point when the voltage signal is stable and the time when the control signal is sent is observed on the oscilloscope 70, which is the corresponding time of the liquid crystal phase shifter.

[0037] It can be seen from the above steps that configuring the phase shifter 52 so that it can shift the test signal to a specified phase ψ1 and generate a reference signal is also one of the key points of the test work. Figure 4 The connections shown can complete the phase shifter configuration. Figure 6 As shown, the method for configuring the phase shifter 52 includes: generating a test signal based on a control signal through a network analyzer 40; shifting the test signal by a phase to be tested ψ2 through a liquid crystal phase shifter 10 (since the mapping relationship between the bias voltage Vth of the liquid crystal phase shifter 10 and the phase shift phase has been obtained before, the required bias voltage Vth can be simply selected); shifting the phase of the test signal through the phase shifter 52 and generating a reference signal; synthesizing the output signal of the liquid crystal phase shifter 10 with the reference signal through a combiner 54 and generating a synthesized signal; connecting the output end of the combiner 54 to the output port OUT through a first switch 56 and a second switch 58; analyzing the power of the synthesized signal through the network analyzer 40, and adjusting the phase shifter 52 so that the phase of the phase shifter 52 reaches the specified phase.

[0038] In one embodiment, the phase difference between the specified phase ψ1 and the phase to be measured ψ2 is set to 180°, so that when the power of the synthetic signal is at the minimum value during the process of adjusting the phase shifter 52, it can be considered that the phase shifter 52 has been configured. In addition, the amplitude of the reference signal is adjusted to the same amplitude as the output signal of the liquid crystal phase shifter through the adjustable attenuator 53, so that the amplitude of the synthetic signal can be minimized, which is convenient for subsequent observation.

[0039] In this case, when the response time test of the liquid crystal phase shifter is performed, after the phase shift of the liquid crystal phase shifter 10 reaches a stable state, the phase difference between the output signal of the liquid crystal phase shifter 10 and the reference signal is 180°, the voltage signal is at a minimum value, and the voltage signal has a large change amplitude during the whole process, so the time point when the liquid crystal phase shifter 10 completes the phase shift can be conveniently and intuitively found on the oscilloscope 70. In addition, in other embodiments, the detector 57 can be replaced by an inverse detector, and then after the phase shift of the liquid crystal phase shifter 10 reaches a stable state, the voltage signal is at a maximum value.

[0040] Similarly, in other embodiments, the phase difference between the specified phase ψ1 and the phase to be measured ψ2 may be set to 90°.

[0041] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0042] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A method for testing the response time of a liquid crystal phase shifter, characterized in that: Based on a liquid crystal phase shifter response time test system, the liquid crystal phase shifter response time test system includes a host computer, a voltage driving module, a network analyzer and a test module; wherein the test module includes a signal generator, a phase shifter, a signal synthesis module and an oscilloscope; the signal synthesis module includes a combiner, a detector, a first switch, a second switch and an output port; The test method comprises: establishing a mapping relationship between a bias voltage of a liquid crystal phase shifter and a phase shift; shifting a test signal to a specified phase through a test module and generating a reference signal; synthesizing an output signal of the liquid crystal phase shifter with the reference signal and generating a synthesized signal, and obtaining a response time of the liquid crystal phase shifter according to a stabilization time of the synthesized signal; Wherein, the mapping relationship between the bias voltage and the phase shift of the liquid crystal phase shifter is established by: generating a control signal through a host computer; generating a bias voltage based on the control signal through a voltage driving module; generating a test signal based on the control signal through a network analyzer, and sending the output signal phase information of the liquid crystal phase shifter to the host computer; establishing the mapping relationship between the bias voltage and the phase shift of the liquid crystal phase shifter through the host computer; Wherein, shifting the test signal to a specified phase and generating a reference signal through the test module includes: configuring a phase shifter, generating a test signal through a signal generator, shifting the test signal to a specified phase through the phase shifter and generating a reference signal; wherein the configuration of the phase shifter includes: generating a test signal based on a control signal through a network analyzer; shifting the test signal to a phase to be tested through a liquid crystal phase shifter; shifting the phase of the test signal through the phase shifter and generating a reference signal; synthesizing the output signal of the liquid crystal phase shifter with the reference signal through a combiner and generating a synthesized signal; connecting the output end of the combiner to the output port through a first switch and a second switch; analyzing the power of the synthesized signal through a network analyzer, and adjusting the phase shifter so that the phase of the phase shifter reaches the specified phase; The phase difference between the specified phase and the phase to be tested is 180°, and the phase of the phase shifter reaches the specified phase when the power of the synthetic signal is the minimum power; Among them, the method of obtaining the response time of the liquid crystal phase shifter according to the stabilization time of the synthesized signal includes: connecting the output end of the combiner to the input end of the detector through a first switch, and connecting the output end of the detector to the output port through a second switch; generating a control signal through a host computer; selecting a bias voltage according to the required phase to be tested, and generating the bias voltage through a voltage driving module; shifting the phase of the test signal through a liquid crystal phase shifter; synthesizing the output signal of the liquid crystal phase shifter with a reference signal through a combiner to generate a synthesized signal, and generating a voltage signal based on the synthesized signal through a detector; and analyzing the time required for the voltage signal to reach a stable state through an oscilloscope.

2. A liquid crystal phase shifter response time test system, based on the liquid crystal phase shifter response time test method according to claim 1, characterized in that: include: The host computer is used to generate control signals; A voltage driving module, used for generating a bias voltage based on a control signal; A network analyzer, used to generate a test signal based on a control signal when establishing a mapping relationship between a bias voltage and a phase shift of a liquid crystal phase shifter, and to send phase information of an output signal of the liquid crystal phase shifter to a host computer, wherein the host computer is used to establish a mapping relationship between a bias voltage and a phase shift of the liquid crystal phase shifter; A test module, used to shift a test signal by a specified phase and generate a reference signal when testing the response time of a liquid crystal phase shifter, synthesize an output signal of the liquid crystal phase shifter with the reference signal and generate a synthesized signal, and obtain the response time of the liquid crystal phase shifter according to a stabilization time of the synthesized signal; The test module includes a signal generator, a power divider, a phase shifter, a signal synthesis module and an oscilloscope; The signal generator is used to generate a test signal based on the control signal when testing the response time of the liquid crystal phase shifter; The power divider is used to divide the test signal generated by the signal generator into two test signals, the input end of the power divider is used to receive the test signal generated by the signal generator, the first output end of the power divider is connected to the input end of the liquid crystal phase shifter, and the second output end of the power divider is connected to the input end of the phase shifter; The phase shifter is used to shift the test signal generated by the signal generator to a specified phase and generate a reference signal; The signal synthesis module is used to synthesize the output signal of the liquid crystal phase shifter with the reference signal to generate a synthesized signal, and to generate a voltage signal based on the synthesized signal; The oscilloscope is used to analyze the time required for the voltage signal to reach a stable state, the first input terminal of the oscilloscope is used to receive a control signal, and the second input terminal of the oscilloscope is used to receive a voltage signal; The signal synthesis module includes an adjustable attenuator, a combiner, a detector, a first switch, a second switch, a control module and an output port. The input end of the adjustable attenuator is connected to the output end of the phase shifter, the output end of the adjustable attenuator is connected to the first input end of the combiner to adjust the size of the reference signal, the second input end of the combiner is connected to the output end of the liquid crystal phase shifter, the output end of the combiner is connected to the first end of the first switch to generate a synthesized signal, the second end of the first switch is connected to the input end of the detector, the output end of the detector is connected to the second end of the second switch to output a voltage signal based on the synthesized signal, the first end of the second switch is connected to the output port, the third end of the first switch is connected to the third end of the second switch, and the control module is used to control the on and off of the first switch and the second switch based on the control signal.

3. The liquid crystal phase shifter response time test system according to claim 2, characterized in that: The combiner is a 90° 3dB bridge, and the signal synthesis module further includes a load. The first output end of the 90° 3dB bridge generates a synthesized signal, and the second output end of the 90° 3dB bridge is connected to the load.

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