CN117353840A - Calibration test method and calibration test equipment for liquid crystal phased array antenna - Google Patents
Calibration test method and calibration test equipment for liquid crystal phased array antenna Download PDFInfo
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- 238000012360 testing method Methods 0.000 title claims abstract description 128
- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 83
- 238000010998 test method Methods 0.000 title claims abstract description 18
- 239000000523 sample Substances 0.000 claims abstract description 73
- 238000012545 processing Methods 0.000 claims abstract description 19
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- 238000004891 communication Methods 0.000 abstract description 4
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/10—Monitoring; Testing of transmitters
- H04B17/11—Monitoring; Testing of transmitters for calibration
- H04B17/12—Monitoring; Testing of transmitters for calibration of transmit antennas, e.g. of the amplitude or phase
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/08—Measuring electromagnetic field characteristics
- G01R29/10—Radiation diagrams of antennas
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/10—Monitoring; Testing of transmitters
- H04B17/101—Monitoring; Testing of transmitters for measurement of specific parameters of the transmitter or components thereof
- H04B17/104—Monitoring; Testing of transmitters for measurement of specific parameters of the transmitter or components thereof of other parameters, e.g. DC offset, delay or propagation times
Abstract
The disclosure provides a calibration test method and calibration test equipment for a liquid crystal phased array antenna, belongs to the technical field of wireless communication, and can solve the problem of calibration test accuracy of the existing liquid crystal phased array antenna. The calibration test method of the liquid crystal phased array antenna comprises the following steps: placing the liquid crystal phased array antenna on a placing platform; aligning the test probe to the antenna unit to be tested and a plurality of antenna units around the antenna unit to be tested; transmitting M driving voltages to the antenna unit to be tested, and controlling the driving voltages of a plurality of antenna units around the antenna unit to be tested to be unchanged, wherein the transmitted driving voltages are different each time; m is a positive integer; reading the amplitude and the phase of M reflection coefficients corresponding to a plurality of antenna units around the antenna unit to be detected; and carrying out data processing on the amplitude and the phase of the M reflection coefficients to obtain the absolute phase of the antenna unit to be detected.
Description
Technical Field
The disclosure belongs to the technical field of wireless communication, and particularly relates to a calibration test method and calibration test equipment for a liquid crystal phased array antenna.
Background
With the development of wireless communication technology, the variety of antennas is also increasing. The liquid crystal phased array antenna has become one of important research and development directions in the field of wireless communication due to the advantages of a flexible scanning mode and the like. The liquid crystal phased array antenna utilizes dielectric anisotropy of liquid crystal in the liquid crystal layer, provides deflection voltage for the liquid crystal layer through a transmission line, and controls the deflection direction of the liquid crystal to change the phase shift of the phase shifter, so that the antenna of the alignment direction of the phased array antenna is adjusted.
The current liquid crystal phased array antenna controls the phase change of the phase shifter through deflection voltage, if the size of the test probe is too small, the waveguide cut-off frequency can be increased, the cut-off frequency band can be definitely in the working frequency band range of the antenna, and the accuracy of the test result is affected. When the liquid crystal phased array antenna is tested and calibrated, the test probe covers a plurality of antenna units each time, so that the amplitude-phase characteristics of the single antenna unit cannot be extracted, and the calibration and test precision of the liquid crystal phased array antenna is affected.
Disclosure of Invention
The present disclosure aims to at least solve one of the technical problems existing in the prior art, and provides a calibration test method and a calibration test device for a liquid crystal phased array antenna.
In a first aspect, an embodiment of the present disclosure provides a calibration test method for a liquid crystal phased array antenna, where the liquid crystal phased array antenna includes: n antenna units arranged in an array, wherein N is a positive integer, and the calibration test method of the liquid crystal phased array antenna comprises the following steps:
placing the liquid crystal phased array antenna on a placing platform;
aligning the test probe to the antenna unit to be tested and a plurality of antenna units around the antenna unit to be tested;
transmitting M driving voltages to the antenna unit to be tested, and controlling the driving voltages of a plurality of antenna units around the antenna unit to be tested to be unchanged, wherein the transmitted driving voltages are different each time; m is a positive integer;
reading the amplitude and the phase of M reflection coefficients corresponding to a plurality of antenna units around the antenna unit to be detected;
and carrying out data processing on the amplitude and the phase of the M reflection coefficients to obtain the absolute phase of the antenna unit to be tested.
Optionally, the data processing is performed on the magnitudes and phases of the M reflection coefficients to obtain an absolute phase of the antenna unit to be measured, including:
calculating the amplitude and the phase of the M reflection coefficients to obtain M groups of first numerical values and second numerical values;
drawing M groups of first numerical values and second numerical values serving as coordinates in a two-dimensional coordinate system to form M coordinate points;
fitting the M coordinate points to form a fitting circle, and acquiring the center coordinates of the fitting circle;
obtaining M groups of third numerical values and fourth numerical values according to the M groups of first numerical values and second numerical values and the central coordinates of the fitting circle;
and calculating the absolute phase of the antenna unit to be measured according to the M groups of third and fourth values.
Optionally, performing data processing on the amplitudes and phases of the M reflection coefficients to obtain an absolute phase of the antenna unit to be measured, and then further including:
aligning the test probes with other antenna units to be tested one by one and a plurality of antenna units around the test probes;
and acquiring the absolute phases of other antenna units to be tested according to the amplitudes and phases of the M reflection coefficients of the other antenna units to be tested.
Optionally, aligning the test probe to other antenna units to be tested and a plurality of antenna units around the other antenna units to be tested one by one, including:
and controlling the test probe to move according to a preset rule.
Optionally, placing the liquid crystal phased array antenna on a placement platform, before further including:
placing a metal plate on a placement platform at the position where the liquid crystal phased array antenna is placed;
leveling the plane where the automatic scanning frame is positioned;
reading the amplitude and phase of the reflection coefficient of the metal plate;
and calibrating the loss and the phase of the test probe according to the amplitude and the phase of the reflection coefficient of the metal plate.
Second aspect an embodiment of the present disclosure provides a calibration test apparatus for a liquid crystal phased array antenna, the calibration test apparatus for a liquid crystal phased array antenna including: the device comprises a placing platform, a test probe, a voltage issuing control board, a vector network analyzer and a data processing instrument;
the placement platform is configured to place the liquid crystal phased array antenna;
the test probe is configured to array the antenna to be tested and a plurality of antenna units around the antenna to be tested;
the voltage issuing control board is configured to issue driving voltages to the antenna unit to be tested for M times and control the driving voltages of a plurality of antenna units around the antenna unit to be tested to be unchanged, wherein the driving voltages issued each time are different; m is a positive integer;
the vector network analyzer is connected with the test probe and is configured to read the amplitude and the phase of M reflection coefficients corresponding to the antenna unit to be tested and a plurality of antenna units around the antenna unit to be tested;
the data processor is connected with the vector network analyzer and is configured to perform data processing on the amplitude and the phase of the M reflection coefficients to obtain the absolute phase of the antenna unit to be detected.
Optionally, the calibration test device of the liquid crystal phased array antenna further includes: an automated gantry;
the automated gantry is coupled to the test probe and configured to control movement of the test probe according to a preset rule.
Optionally, the automated gantry comprises: control module and mechanical arm;
the control module is connected with the mechanical arm, and the mechanical arm is connected with the test probe.
Optionally, the size of the test probe is larger than the size of the antenna unit to be tested.
Optionally, a distance between the test probe and the antenna unit under test is less than or equal to one tenth of a wavelength.
Optionally, the test probe includes: ridge waveguide horn antenna.
Drawings
Fig. 1 is a flow chart of a calibration test method of a liquid crystal phased array antenna according to an embodiment of the disclosure;
FIG. 2 is a schematic diagram of a test probe in an embodiment of the present disclosure;
FIG. 3 is a schematic flow chart of data processing for the amplitude and phase of M reflection coefficients according to an embodiment of the disclosure;
fig. 4 is a calibration test device for a liquid crystal phased array antenna according to an embodiment of the present disclosure.
Detailed Description
In order that those skilled in the art will better understand the technical solutions of the present disclosure, the present disclosure will be described in further detail with reference to the accompanying drawings and detailed description.
Unless defined otherwise, technical or scientific terms used in this disclosure should be given the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The terms "first," "second," and the like, as used in this disclosure, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. Likewise, the terms "a," "an," or "the" and similar terms do not denote a limitation of quantity, but rather denote the presence of at least one. The word "comprising" or "comprises", and the like, means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof, but does not exclude other elements or items. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", etc. are used merely to indicate relative positional relationships, which may also be changed when the absolute position of the object to be described is changed.
The calibration test of the liquid crystal phased array antenna is an essential link for ensuring accurate beam pointing, and the traditional waveguide simulation method can be used for realizing the calibration of the phase of an antenna unit in the liquid crystal phased array antenna. In the traditional waveguide simulation method, a test probe is directly buckled on an antenna unit to be tested of an array surface of a liquid crystal phased array antenna, and an external vector network analyzer is utilized to obtain the amplitude-phase characteristic of the antenna unit. However, the size of the liquid crystal phased array unit is related to the working frequency of the liquid crystal phased array, the higher the working frequency is, the smaller the size of the antenna unit is, in order to accurately obtain the amplitude-phase characteristics of the single unit, the size of the calibration test probe needs to be made to be similar to the size of the antenna unit, so that the test probe can cover the antenna unit to be tested completely, and meanwhile, the antenna unit adjacent to the antenna unit to be tested is not included. However, as the cutoff frequency of the waveguide is related to the size of the waveguide, the cutoff frequency of the waveguide increases along with the decrease of the size of the waveguide, which may cause the transmission forbidden band of the waveguide to be located on the working frequency band of the antenna unit to be tested, so that the waveguide simulation method cannot accurately extract the amplitude-phase characteristic of the antenna unit, and the accuracy of the calibration test of the liquid crystal phased array antenna is affected.
In order to solve at least one of the above technical problems, an embodiment of the present disclosure provides a calibration test method and a calibration test device for a liquid crystal phased array antenna, and the calibration test method and the calibration test device for the liquid crystal phased array antenna provided by the embodiment of the present disclosure will be described in further detail below with reference to the accompanying drawings and detailed description.
In a first aspect, an embodiment of the present disclosure provides a calibration test method for a liquid crystal phased array antenna, where the liquid crystal phased array antenna has N antenna units arranged in an array, N is a positive integer, and N is generally larger, for example, 1000. Fig. 1 is a flow chart of a calibration test method of a liquid crystal phased array antenna according to an embodiment of the disclosure, as shown in fig. 1, the calibration test method of the liquid crystal phased array antenna includes the following steps S101 to S105.
S101, placing the liquid crystal phased array antenna on a placement platform.
In the step S101, the placement platform may provide a bearing plane for the liquid crystal phased array antenna, where the bearing plane may be a horizontal plane or a vertical plane, and may specifically be set according to the specification and the actual situation of the liquid crystal phased array antenna. In the embodiment of the present disclosure, a bearing plane will be described as an example of a horizontal plane. And the surface of the placement platform needs to be kept as smooth as possible, so that the situation that a test probe contacts with an antenna unit and even damages the antenna unit along with the calibration test in the calibration test process is prevented, and the influence on the accuracy of the calibration test is avoided.
S102, aligning the test probe to the antenna unit to be tested and a plurality of antenna units around the antenna unit to be tested.
In the step S102, the size of the test probe is related to the equivalent incident angle of the electromagnetic wave, and the smaller the size is, the larger the equivalent incident angle is, and it is generally expected that the amplitude-phase characteristic of the antenna unit in the liquid crystal phased array antenna under the condition of normal incidence of the plane wave is obtained in the calibration test process, that is, the smaller the equivalent incident angle is, the better is expected. In order to calibrate the antenna unit in the liquid crystal phased array antenna by using the waveguide simulation method, the size of the test probe cannot be too small, and meanwhile, the size of the antenna unit of the liquid crystal phased array antenna is reduced along with the increase of the working frequency, so that the test probe with lower resolution is required to be used for calibration detection. In the embodiment of the disclosure, the resolution of the test probe may be 2×2, that is, the test probe may cover 2×2 antenna units each time, and the schematic diagram may be shown in fig. 2, where any one of the 2×2 antenna units may be an antenna unit to be tested, and the others are antenna units not to be tested.
S103, transmitting M driving voltages to the antenna unit to be tested, and controlling the driving voltages of a plurality of antenna units around the antenna unit to be tested to be unchanged, wherein the transmitted driving voltages are different each time; m is a positive integer.
In step S103, each antenna unit in the liquid crystal phased array antenna may work under the voltage provided by the ac power supply, and the driving voltage of the antenna unit to be tested in the liquid crystal phased array antenna may be adjusted by the voltage down-transmitting control board, while the driving voltages of other antenna units are kept unchanged, so that the amplitude-phase characteristics of the antenna unit to be tested are different from those of other antenna units, and then the amplitude-phase characteristics of the individual antenna units to be tested are extracted. Specifically, M driving voltages can be issued to the antenna unit to be tested, and M can be any positive integer each time the issued driving voltages are different, and of course, the larger the value of M is, the more favorable to extracting the amplitude-phase characteristic of the antenna to be tested, and meanwhile, the larger the value of M cannot be, in order to save energy consumption. For example, the value of M may be set to 50 times.
S104, reading the amplitude and the phase of M reflection coefficients corresponding to a plurality of antenna units around the antenna unit to be detected.
In step S104, the driving voltage input to the antenna unit to be tested is different each time, resulting in different liquid crystal deflection angles of the liquid crystal layer, so that the signal reflected by the antenna unit to be tested is different each time, and the signal received by the test probe is also different. The amplitude and the phase of the reflection coefficient of each antenna unit to be measured can be read through the vector network analyzer according to the signals received by the test probe.
S105, data processing is carried out on the amplitude and the phase of the M reflection coefficients, and the absolute phase of the antenna unit to be detected is obtained.
In the step S105, the amplitude and the phase of the M reflection coefficients represent the amplitude-phase characteristics of the antenna unit to be tested under different driving voltages, and the data processing can be performed on the amplitude and the phase of the M reflection coefficients to obtain the absolute phase of the antenna unit to be tested, so as to extract the absolute phase of the antenna to be tested, and avoid the interference of other antenna units covered by the test probe.
In the method for testing the liquid crystal phased array antenna, the driving voltage of the antenna unit to be tested is adjusted for multiple times, so that the amplitude and the phase of the reflection coefficient of the antenna unit to be tested are changed for multiple times, the amplitude and the phase of the reflection coefficient of the antenna unit to be tested are extracted by making the amplitude-phase characteristics of the antenna unit to be tested different from those of other antenna units, and the absolute phase of the antenna unit to be tested is extracted by carrying out data processing on the amplitude and the phase of the reflection coefficient for multiple times. Therefore, the influence of the adjacent other antenna units on the amplitude-phase characteristics of the antenna unit to be tested can be avoided, and the transmission forbidden band of the waveguide is positioned on the working frequency band of the antenna unit to be tested, so that the accuracy of the calibration test of the liquid crystal phased array antenna can be improved.
In some embodiments, fig. 3 is a schematic flow chart of data processing on the magnitudes and phases of the M reflection coefficients in the embodiments of the present disclosure, and as shown in fig. 3, the data processing on the magnitudes and phases of the M reflection coefficients may specifically include the following steps S301 to S305.
S301, calculating the amplitude and the phase of M reflection coefficients to obtain M groups of first values and second values.
In the above step S301, the amplitude and phase of the reflection coefficient S11 corresponding to M times of different driving voltages can be respectively denoted as alpha j And beta j And vector analysis and calculation are carried out, wherein the specific calculation process can be a j ＝α j *cos(β j )，b j ＝α j *sin(β j ) Wherein a is j Representing a first value, b j Representing a second value.
And S302, drawing M groups of first numerical values and second numerical values serving as coordinates in a two-dimensional coordinate system to form M coordinate points.
In the above step S302, the step a may be j Is the abscissa value, b j For the ordinate value, will be a j ，b j Drawing into a two-dimensional coordinate system to form M scattered coordinate points.
S303, fitting the M coordinate points to form a fitting circle, and obtaining the center coordinates of the fitting circle.
In the step S303, the fitting is performed on the M coordinate points by using circles with different radii, so as to form a fitting circle. Then, the center coordinates (x, y) of the fitting circle are obtained.
S304, obtaining M groups of third numerical values and fourth numerical values according to the M groups of first numerical values and second numerical values and the central coordinates of the fitting circle.
In the above step S304, c is calculated j ＝α j -x，d j ＝b j -x, wherein c j Represents a third value, d j A fourth value is indicated.
S305, calculating the absolute phase of the antenna unit to be measured according to the M groups of third and fourth values.
In the above step S305, β 'is calculated' j ＝atan(c j /d j ) Wherein, beta' j Representation ofThe absolute phase of the antenna element to be measured.
In some embodiments, as shown in fig. 1, after step S105, further includes: step S107 to step S108.
And S107, aligning the test probes with other antenna units to be tested one by one and a plurality of antenna units around the antenna units to be tested.
S108, acquiring absolute phases of other antenna units to be tested according to the amplitudes and phases of M reflection coefficients of the other antenna units to be tested.
In practical application, after one of the antenna units to be tested is tested and calibrated according to the steps S101 to S105, calibration tests are performed on other antenna units one by one according to the steps until all calibration tests of the N antenna units in the liquid crystal phased array antenna unit are completed.
In some embodiments, step S102, aligning the test probe with the other antenna units to be tested and the surrounding multiple antenna units one by one, specifically includes: and controlling the test probe to move according to a preset rule.
The automatic scanning frame is provided with a control program, and the control program is used for controlling the test probe to move according to a preset rule, such as row-by-row movement or column-by-column movement. And moreover, the accurate movement of the test probe can be realized, and the influence of manual operation on the calibration test accuracy is avoided.
In some embodiments, in step S101, the liquid crystal phased array antenna is placed on the placement platform, and the test probe itself is also required to be standardized before. Specifically, the method comprises the following steps: placing a metal plate at the position of the liquid crystal phased array antenna on the placing platform; leveling the plane where the automatic scanning frame is positioned; reading the amplitude and the phase of the reflection coefficient of the metal plate; and calibrating the loss and the phase of the test probe according to the amplitude and the phase of the reflection coefficient of the metal plate.
The front surface of the flat metal plate can be equivalent to an antenna unit to be tested, the antenna unit can almost completely reflect test signals reflected by the test probe, the performance of the antenna unit to be tested is stable, and the loss and the phase of the test probe can be calibrated by using standard tests on the metal plate, so that the accuracy of the calibration test of the liquid crystal phased array antenna can be prevented from being influenced by the loss of the test probe.
In a second aspect, an embodiment of the present disclosure provides a calibration test apparatus for a liquid crystal phased array antenna, and fig. 4 is a calibration test apparatus for a liquid crystal phased array antenna provided in an embodiment of the present disclosure, where, as shown in fig. 4, the calibration test apparatus for a liquid crystal phased array antenna includes: a placement platform 401, a test probe 402, a voltage delivery control board 403, a vector network analyzer 404, and a data processor (not shown). The placement platform 401 is configured to place a liquid crystal phased array antenna. The test probe 402 is configured to array an antenna under test and a plurality of antenna elements therearound. The voltage down-transmitting control board 403 is configured to transmit M driving voltages to the antenna unit to be measured and control the driving voltages of a plurality of antenna units around the antenna unit to be measured to be unchanged, wherein the driving voltages transmitted each time are different; m is a positive integer. The vector network analyzer 404 is connected to the test probe 402 and configured to read the magnitudes and phases of M reflection coefficients corresponding to the antenna element to be tested and the plurality of antenna elements around the antenna element to be tested. The data processor is connected to the vector network analyzer 404 and is configured to perform data processing on the magnitudes and phases of the M reflection coefficients, and obtain the absolute phase of the antenna element to be measured. The calibration test equipment of the liquid crystal phased array antenna further comprises: an automated gantry 405; an automated gantry 405 is coupled to the test probe 402 and is configured to control movement of the test probe according to a preset rule.
The calibration test device for the liquid crystal phased array antenna provided by the embodiment of the present disclosure may be used to execute the calibration test method for the liquid crystal phased array antenna provided by any one of the embodiments, and the specific working process of the calibration test device is the same as the implementation principle of the calibration test method for the liquid crystal phased array antenna provided by any one of the embodiments, and is not described herein.
According to the calibration test equipment for the liquid crystal phased array antenna, the drive voltage of the antenna unit to be tested is adjusted for multiple times, so that the amplitude and the phase of the reflection coefficient of the antenna unit to be tested are changed for multiple times, the amplitude and the phase of the reflection coefficient of the antenna unit to be tested are extracted by making the amplitude-phase characteristics of the antenna unit to be tested different from those of other antenna units, and the absolute phase of the antenna unit to be tested is extracted by carrying out data processing on the amplitude and the phase of the reflection coefficient of the antenna unit to be tested for multiple times. Therefore, the influence of the adjacent other antenna units on the amplitude-phase characteristics of the antenna unit to be tested can be avoided, and the transmission forbidden band of the waveguide is positioned on the working frequency band of the antenna unit to be tested, so that the accuracy of the calibration test of the liquid crystal phased array antenna can be improved.
In some embodiments, the automated gantry 405 includes: control module and mechanical arm; the control module is connected with the mechanical arm, and the mechanical arm is connected with the test probe.
The control module can write in control instructions, so that the mechanical arm moves under the control of the control instructions according to preset rules, and the mechanical arm can drive the test probes connected with the mechanical arm to move, and calibration tests are conducted on all antenna units in the liquid crystal phased array antenna one by one, so that the accuracy of the calibration tests is improved.
In some embodiments, the size of the test probe 402 is larger than the size of the antenna element to be tested.
The size of the test probe is related to the equivalent incident angle of electromagnetic waves, the smaller the size is, the larger the equivalent incident angle is, and in the calibration test process, the amplitude-phase characteristics of the antenna unit in the liquid crystal phased array antenna under the condition of normal incidence of plane waves are expected to be obtained, namely, the smaller the equivalent incident angle is, the better the antenna unit is expected to be. In the embodiment of the present disclosure, the test probe 402 has a larger size, so that the test emitted by the test probe can be incident into the antenna unit at a larger angle, and thus the accuracy of the calibration test can be improved.
In some embodiments, the distance between the test probe and the antenna element under test is less than or equal to one tenth of a wavelength.
The distance between the test probe and the antenna unit to be tested can be smaller than or equal to one tenth of the wavelength, so that the test probe is close to the antenna unit to be tested, the test signal emitted by the test probe can be ensured to be accurately incident into the antenna unit, and a larger incident angle can be ensured, thereby improving the accuracy of calibration test. In practice, the test probe typically employs a rectangular waveguide, and may also employ a specially designed miniaturized horn antenna, including but not limited to a ridge waveguide horn antenna.
It is to be understood that the above embodiments are merely exemplary embodiments employed to illustrate the principles of the present disclosure, however, the present disclosure is not limited thereto. Various modifications and improvements may be made by those skilled in the art without departing from the spirit and substance of the disclosure, and are also considered to be within the scope of the disclosure.
Claims (11)
1. A calibration test method for a liquid crystal phased array antenna, the liquid crystal phased array antenna comprising: n antenna units arranged in an array, N is a positive integer, and the calibration test method for the liquid crystal phased array antenna comprises the following steps:
placing the liquid crystal phased array antenna on a placing platform;
aligning the test probe to the antenna unit to be tested and a plurality of antenna units around the antenna unit to be tested;
transmitting M driving voltages to the antenna unit to be tested, and controlling the driving voltages of a plurality of antenna units around the antenna unit to be tested to be unchanged, wherein the transmitted driving voltages are different each time; m is a positive integer;
reading the amplitude and the phase of M reflection coefficients corresponding to a plurality of antenna units around the antenna unit to be detected;
and carrying out data processing on the amplitude and the phase of the M reflection coefficients to obtain the absolute phase of the antenna unit to be tested.
2. The method for calibrating and testing a liquid crystal phased array antenna according to claim 1, wherein the data processing is performed on the magnitudes and phases of the M reflection coefficients to obtain the absolute phase of the antenna unit to be tested, including:
calculating the amplitude and the phase of the M reflection coefficients to obtain M groups of first numerical values and second numerical values;
drawing M groups of first numerical values and second numerical values serving as coordinates in a two-dimensional coordinate system to form M coordinate points;
fitting the M coordinate points to form a fitting circle, and acquiring the center coordinates of the fitting circle;
obtaining M groups of third numerical values and fourth numerical values according to the M groups of first numerical values and second numerical values and the central coordinates of the fitting circle;
and calculating the absolute phase of the antenna unit to be measured according to the M groups of third and fourth values.
3. The method for calibrating and testing a liquid crystal phased array antenna according to claim 1, wherein the steps of performing data processing on the magnitudes and phases of the M reflection coefficients to obtain an absolute phase of the antenna unit to be tested, and then further include:
aligning the test probes with other antenna units to be tested one by one and a plurality of antenna units around the test probes;
and acquiring the absolute phases of other antenna units to be tested according to the amplitudes and phases of the M reflection coefficients of the other antenna units to be tested.
4. A method of calibrating a liquid crystal phased array antenna according to claim 3, wherein aligning the test probe one by one with other antenna elements to be tested and a plurality of antenna elements around the other antenna elements to be tested, comprises:
and controlling the test probe to move according to a preset rule.
5. The method of calibrating and testing a liquid crystal phased array antenna of claim 1, wherein placing the liquid crystal phased array antenna on a placement platform, further comprises:
placing a metal plate on a placement platform at the position where the liquid crystal phased array antenna is placed;
leveling the plane where the automatic scanning frame is positioned;
reading the amplitude and phase of the reflection coefficient of the metal plate;
and calibrating the loss and the phase of the test probe according to the amplitude and the phase of the reflection coefficient of the metal plate.
6. The calibration test equipment of liquid crystal phased array antenna, characterized by, the calibration test equipment of liquid crystal phased array antenna includes: the device comprises a placing platform, a test probe, a voltage issuing control board, a vector network analyzer and a data processing instrument;
the placement platform is configured to place the liquid crystal phased array antenna;
the test probe is configured to array the antenna to be tested and a plurality of antenna units around the antenna to be tested;
the voltage issuing control board is configured to issue driving voltages to the antenna unit to be tested for M times and control the driving voltages of a plurality of antenna units around the antenna unit to be tested to be unchanged, wherein the driving voltages issued each time are different; m is a positive integer;
the vector network analyzer is connected with the test probe and is configured to read the amplitude and the phase of M reflection coefficients corresponding to the antenna unit to be tested and a plurality of antenna units around the antenna unit to be tested;
the data processor is connected with the vector network analyzer and is configured to perform data processing on the amplitude and the phase of the M reflection coefficients to obtain the absolute phase of the antenna unit to be detected.
7. The calibration test apparatus of a liquid crystal phased array antenna of claim 6, further comprising: an automated gantry;
the automated gantry is coupled to the test probe and configured to control movement of the test probe according to a preset rule.
8. The calibration test apparatus of claim 7, wherein the automated gantry comprises: control module and mechanical arm;
the control module is connected with the mechanical arm, and the mechanical arm is connected with the test probe.
9. The device of claim 6, wherein the test probe has a size greater than the size of the antenna element to be tested.
10. The device of claim 6, wherein the distance between the test probe and the antenna element under test is less than or equal to one tenth of a wavelength.
11. The calibration test apparatus of claim 6, wherein the test probe comprises: ridge waveguide horn antenna.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210749040.0A CN117353840A (en) | 2022-06-28 | 2022-06-28 | Calibration test method and calibration test equipment for liquid crystal phased array antenna |
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