A rectangular waveguide directional coupler test method and system

Abstract

The present invention relates to the technical field of directional couplers, and proposes a rectangular waveguide directional coupler test method and system, including: collecting S parameters, determining an S parameter matrix; obtaining the amplitude fluctuation of the rectangular waveguide directional coupler, determining a target port, and obtaining the standing wave fluctuation of the target port; determining the coupling hole interference of the rectangular waveguide directional coupler, and obtaining the correction coefficient of the target port of the rectangular waveguide directional coupler according to the coupling hole interference of the rectangular waveguide directional coupler and the standing wave fluctuation of the target port of the rectangular waveguide directional coupler; correcting the S parameter matrix according to the correction coefficients of all ports of the rectangular waveguide directional coupler, obtaining a corrected S parameter matrix, and obtaining a rectangular waveguide directional coupler test result according to the corrected S parameter matrix. The present invention solves the problem of the deviation of the test result of the rectangular waveguide directional coupler caused by the signal interference caused by the standing wave effect.

Description

Technical Field

[0001] The present invention relates to the technical field of directional couplers, and in particular to a rectangular waveguide directional coupler testing method and system. Background Art

[0002] A rectangular waveguide is a metal pipe with a rectangular cross-section. By utilizing the structural characteristics of a rectangular cross-section, it can effectively guide electromagnetic waves to propagate along the pipe. Therefore, rectangular waveguides are mainly used for electromagnetic wave transmission within a certain frequency range. Specifically, a rectangular waveguide can transmit part of the energy of the input signal to a specific output port, while allowing the remaining energy to continue along the original path.

[0003] In the traditional rectangular waveguide directional coupler test process, a network analyzer is usually used directly to measure the relevant parameters. However, when using a network analyzer to test a rectangular waveguide directional coupler, the standing wave effect caused by reflection during the test is not fully considered. The standing wave effect may cause signal interference, making the relevant parameters measured by the network analyzer insufficiently accurate, resulting in deviations in the test results of the rectangular waveguide directional coupler. Summary of the invention

[0004] The present invention provides a rectangular waveguide directional coupler test method and system to solve the problem that the signal interference caused by the standing wave effect leads to the deviation of the test result of the rectangular waveguide directional coupler. The technical solution adopted is as follows:

[0005] In a first aspect, an embodiment of the present invention provides a rectangular waveguide directional coupler testing method, the method comprising the following steps:

[0006] Collecting S parameters between every two ports of a rectangular waveguide directional coupler at different collection times within a local time period, and determining an S parameter matrix at the same collection time according to all S parameters collected at the same collection time, wherein the rectangular waveguide directional coupler includes an input port, a through port, a coupling port, and an isolation port;

[0007] The standing wave ratio is calculated according to all S parameter matrices, and the amplitude fluctuation of the rectangular waveguide directional coupler is obtained according to the difference between the amplitudes of the S parameters between every two input ports and the standing wave ratio. Any port of the rectangular waveguide directional coupler is recorded as the target port, and the standing wave fluctuation of the target port is obtained by combining the difference between the phases of the S parameters collected at all acquisition times between the input port and the target port;

[0008] Determine the coupling hole interference of the rectangular waveguide directional coupler according to the diameter and number of the coupling holes of the rectangular waveguide directional coupler, the wave impedance of the waveguide, the input impedance of the coupling holes, and the S parameter between the two input ports; obtain the correction coefficient of the target port of the rectangular waveguide directional coupler according to the coupling hole interference of the rectangular waveguide directional coupler and the standing wave fluctuation degree of the target port of the rectangular waveguide directional coupler;

[0009] The S parameter matrix is ​​corrected according to the correction coefficients of all ports of the rectangular waveguide directional coupler to obtain the corrected S parameter matrix, and the test result of the rectangular waveguide directional coupler is obtained according to the corrected S parameter matrix.

[0010] Further, the S parameter matrix at the same acquisition moment is determined according to all S parameters acquired at the same acquisition moment, including the specific method of:

[0011] The S parameter matrix A at the same acquisition time is:

[0012]

[0013] Where A represents the S parameter matrix; the input port, through port, coupled port, and isolated port are labeled 1, 2, 3, and 4 respectively. uv Represents the S parameter between a port labeled u and a port labeled v, where u = 1, 2, 3, 4 and v = 1, 2, 3, 4.

[0014] Further, the amplitude fluctuation degree of the rectangular waveguide directional coupler includes the following specific methods:

[0015] The product of the coefficient of variation of the amplitude of all collected S parameters between two input ports and the standing wave ratio is recorded as the amplitude fluctuation of the rectangular waveguide directional coupler.

[0016] Further, the step of combining the difference between the phases of the S parameters between the input port and the target port collected at all collection moments to obtain the standing wave fluctuation degree of the target port includes the following specific methods:

[0017] The difference between the phases of the S parameters between the input port and the target port is taken as the phase difference of the target port, the square of the cosine value of the phase difference of the target port is recorded as the absolute phase difference of the target port, and the cumulative sum of the absolute phase differences of the target port at all acquisition moments is recorded as the phase fluctuation of the target port;

[0018] The standing wave fluctuation degree of the target port of the rectangular waveguide directional coupler is obtained according to the phase fluctuation degree of the target port of the rectangular waveguide directional coupler and the amplitude fluctuation degree of the rectangular waveguide directional coupler.

[0019] Further, the method of obtaining the standing wave fluctuation degree of the target port of the rectangular waveguide directional coupler according to the phase fluctuation degree of the target port of the rectangular waveguide directional coupler and the amplitude fluctuation degree of the rectangular waveguide directional coupler includes the following specific methods:

[0020] The linear normalized value of the ratio of the amplitude fluctuation of the rectangular waveguide directional coupler to the phase fluctuation of the target port is recorded as the standing wave fluctuation of the target port.

[0021] Furthermore, the coupling hole interference degree of the rectangular waveguide directional coupler includes the following specific methods:

[0022] According to the S parameters between the two input ports, the wave impedance of the waveguide of the rectangular waveguide directional coupler is adjusted to obtain the input impedance of the coupling hole of the rectangular waveguide directional coupler. The calculation formula of the input impedance of the coupling hole of the rectangular waveguide directional coupler is:

[0023]

[0024] In the formula, Z c It represents the input impedance of the coupling hole; It represents the average value of all S parameters between two input ports. 0 The wave impedance of the waveguide of the rectangular waveguide directional coupler;

[0025] The coupling hole interference degree of the rectangular waveguide directional coupler is determined according to the diameter and number of the coupling holes of the rectangular waveguide directional coupler, the wave impedance of the waveguide and the input impedance of the coupling holes.

[0026] Further, the coupling hole interference degree of the rectangular waveguide directional coupler is determined according to the diameter and number of the coupling holes of the rectangular waveguide directional coupler, the wave impedance of the waveguide and the input impedance of the coupling holes, including the specific method of:

[0027] The ratio of the wave impedance of the waveguide of the rectangular waveguide directional coupler to the input impedance is recorded as the waveguide influence of the rectangular waveguide directional coupler, and the linear normalized value of the product of the waveguide influence of the rectangular waveguide directional coupler and the diameter of the coupling hole and the number of coupling holes is recorded as the coupling hole interference of the rectangular waveguide directional coupler.

[0028] Further, the correction coefficient of the target port of the rectangular waveguide directional coupler is obtained according to the coupling hole interference degree of the rectangular waveguide directional coupler and the standing wave fluctuation degree of the target port of the rectangular waveguide directional coupler, including the specific method of:

[0029] The linear normalized value of the sum of the coupling hole interference of the rectangular waveguide directional coupler and the standing wave fluctuation degree of the target port of the rectangular waveguide directional coupler is recorded as the correction coefficient of the target port of the rectangular waveguide directional coupler.

[0030] Further, the S parameter matrix is ​​corrected according to the correction coefficients of all ports of the rectangular waveguide directional coupler to obtain the corrected S parameter matrix, and the test result of the rectangular waveguide directional coupler is obtained according to the corrected S parameter matrix, including the specific method of:

[0031] The S parameter matrix A is corrected according to the correction coefficients of all ports of the rectangular waveguide directional coupler to obtain the corrected S parameter matrix A′, where:

[0032] For each corrected S parameter matrix, the corrected S parameter matrix is ​​used as the S parameter matrix required in the test process of the rectangular waveguide directional coupler, and the rectangular waveguide directional coupler test is performed using a network analyzer, and the three-dimensional electromagnetic simulation software HFSS is used to obtain the average error between the coupling degree and the simulated coupling degree;

[0033] The mean of the average error between the coupling degree corresponding to all modified S parameter matrices and the simulated coupling degree is calculated. When the mean is less than the second preset threshold, the rectangular waveguide directional coupler test is deemed to be qualified; when the mean is greater than or equal to the second preset threshold, the rectangular waveguide directional coupler test is deemed to be unqualified.

[0034] In a second aspect, an embodiment of the present invention further provides a rectangular waveguide directional coupler test system, comprising a memory, a processor, and a computer program stored in the memory and running on the processor, wherein the processor implements the steps of any one of the above-mentioned methods when executing the computer program.

[0035] The beneficial effects of the present invention are:

[0036] The present application evaluates the degree of fluctuation of the amplitude of the S parameter based on the fact that the standing wave in the directional coupler will interfere with the transmission signal in the waveguide, and the appearance of the standing wave effect will cause the amplitude of the S parameter to fluctuate, and obtains the amplitude fluctuation of the rectangular waveguide directional coupler. In combination with the fact that the phase of the S parameter appears periodic when the standing wave in the directional coupler interferes with the transmission signal in the waveguide, the application evaluates the degree of interference of the standing wave in the directional coupler with the transmission signal in the waveguide, and obtains the standing wave fluctuation of any port of the rectangular waveguide directional coupler. Furthermore, considering the factor that the number and diameter of the coupling holes will affect the coupling strength and the possibility of the formation of the standing wave, when the number of coupling holes is large and the diameter is large, the standing wave A feature with a greater possibility is formed, the coupling hole interference degree of the rectangular waveguide directional coupler is determined, and the correction coefficient of the target port of the rectangular waveguide directional coupler is obtained in combination with the standing wave fluctuation degree of the target port of the rectangular waveguide directional coupler. The correction coefficient of the port is used to correct the S parameter matrix, and then the corrected S parameter matrix is ​​obtained. The corrected S parameter matrix provides accurate S parameters between every two ports of the rectangular waveguide directional coupler; finally, the S parameter matrix is ​​corrected according to the correction coefficients of all ports of the rectangular waveguide directional coupler to obtain the corrected S parameter matrix, and the test results of the rectangular waveguide directional coupler are obtained according to the corrected S parameter matrix, so as to solve the problem of deviation of the test results of the rectangular waveguide directional coupler caused by the signal interference caused by the standing wave effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] 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 of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0038] Figure 1 A schematic flow chart of a rectangular waveguide directional coupler testing method provided by one embodiment of the present invention;

[0039] Figure 2 A flowchart for obtaining amplitude fluctuation provided by one embodiment of the present invention. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions 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 are within the scope of protection of the present invention.

[0041] See also Figure 1 , which shows a flow chart of a rectangular waveguide directional coupler testing method provided by an embodiment of the present invention, the method comprising the following steps:

[0042] Step S001, collecting S parameters between every two ports of a rectangular waveguide directional coupler at different collection times within a local time period, and determining an S parameter matrix at the same collection time according to all S parameters collected at the same collection time, wherein the rectangular waveguide directional coupler includes an input port, a through port, a coupled port, and an isolated port.

[0043] Select a directional coupler with a rectangular waveguide transmission line type. The directional coupler is composed of two transmission lines and contains four ports, namely, input port, through port, coupled port, and isolated port. The port numbers of the input port, through port, coupled port, and isolated port are marked as 1, 2, 3, and 4 respectively.

[0044] A network analyzer is used to connect the ports of the directional coupler, and the network analyzer is started to collect S parameters between every two ports at the same collection time. The network analyzer is used to collect S parameters at the first preset threshold collection time.

[0045] Among them, the S parameter is a complex number, including a real part and an imaginary part, the real part and the imaginary part represent the amplitude and phase respectively, and the S parameter provides information on the transmission and reflection characteristics of the signal between the network ports. The S parameter and the use of a network analyzer to collect the S parameter are both well-known technologies and are not described in detail. In this embodiment, the frequency range of the network analyzer is set to 300GHz-500GHz, the dynamic range is set to 60dB, the network analyzer is calibrated using the TRL calibration method, the time interval of the collection moment is set to 1GHz, and the value of the first preset threshold is 81. In actual application, as other implementation methods, the implementer can determine the frequency range, dynamic range and calibration method of the network analyzer according to actual conditions, and determine the time interval of the collection moment and the value of the first preset threshold according to actual conditions. This application does not impose any special restrictions.

[0046] Furthermore, the input of the rectangular waveguide directional coupler selected in this embodiment is a terahertz wave. The terahertz wave is an electromagnetic wave frequency band located between microwaves and infrared rays, usually referring to radiation with a frequency range of 0.1 to 10 terahertz. In this embodiment, the frequency range of the terahertz wave is set to 340 GHz-420 GHz. In actual application, as other implementation methods, the implementer can determine the frequency range of the terahertz wave according to actual conditions, and this application does not impose any special restrictions.

[0047] According to all S parameters between every two ports collected from the directional coupler at the same collection time, the S parameter matrix A at the same collection time is determined.

[0048]

[0049] Where A represents the S parameter matrix, S uv Represents the S parameter between a port labeled u and a port labeled v, where u = 1, 2, 3, 4 and v = 1, 2, 3, 4.

[0050] It can be understood that the S parameter between two ports with the same port number is the reflection coefficient of the port; the S parameter matrix A is a complex matrix that contains the amplitude and phase information of the electromagnetic wave during the transmission process. 11 Indicates the S parameters between ports numbered 1.

[0051] Since the S parameters between every two ports collected at one sampling moment can determine the S parameter matrix A at the said sampling moment, the S parameters of the first preset threshold sampling moments are collected using the network analyzer. Therefore, the S parameter matrices of the first preset threshold sampling moments can be obtained in total. Among them, the value of the first preset threshold in this embodiment is 81.

[0052] At this point, the S parameter matrix of the first preset threshold number of acquisition moments is obtained.

[0053] Step S002, calculating the standing wave ratio according to all S parameter matrices, obtaining the amplitude fluctuation of the rectangular waveguide directional coupler according to the difference between the amplitudes of the S parameters between every two input ports and the standing wave ratio, marking any port of the rectangular waveguide directional coupler as the target port, and obtaining the standing wave fluctuation of the target port by combining the difference between the phases of the S parameters between the input port and the target port collected at all collection moments.

[0054] When an electromagnetic wave encounters reflection in a transmission medium, a standing wave is formed. The standing wave is formed by the mutual interference of the forward wave and the reflected wave, and the waveform presents fixed nodes and anti-nodes in space. The standing wave in the directional coupler will interfere with the transmission signal in the waveguide, making the measured S parameters inaccurate.

[0055] The S parameter is a complex number, including a real part and an imaginary part, which represent the amplitude and phase respectively. Since standing waves will change the transmission characteristics of the rectangular waveguide at different frequencies, the amplitude fluctuation of the S parameter is closely related to the appearance of standing waves. When there is no standing wave effect caused by reflection in the directional coupler, the amplitude of the S parameter is uniform. When the standing wave effect caused by reflection appears in the directional coupler, the amplitude of the S parameter will fluctuate. Therefore, when the amplitude of the S parameter fluctuates greatly at different frequencies, there is a high possibility that significant standing waves will appear in the rectangular waveguide directional coupler.

[0056] The standing wave ratio is calculated based on all the S parameter matrices. The standing wave ratio is VSWR, and the calculation of the standing wave ratio is a well-known technology. Specifically, the calculation formula of the standing wave ratio is:

[0057]

[0058] Where, VSWR stands for standing wave ratio; Indicates the average value of the amplitude of all acquired S parameters between two input ports.

[0059] The standing wave ratio reflects the relative intensity information between the reflected wave and the incident wave. When the standing wave ratio is larger, the possibility of the rectangular waveguide directional coupler being affected by the standing wave during the test process is greater.

[0060] The amplitude fluctuation of the rectangular waveguide directional coupler is obtained based on the difference between the amplitudes of the S parameters between the two input ports and the standing wave ratio.

[0061] Preferably, as an embodiment of the present application, the product of the standing wave ratio and the coefficient of variation of the amplitude of the S parameter collected between all two input ports is recorded as the amplitude fluctuation of the rectangular waveguide directional coupler.

[0062] The calculation of the coefficient of variation is a well-known technique. Specifically, the coefficient of variation of the amplitude of the S parameter between two input ports is the ratio of the standard deviation of the amplitude of all S parameters between the two input ports to the mean.

[0063] Specifically, the calculation formula for the amplitude fluctuation of the rectangular waveguide directional coupler is:

[0064]

[0065] Where, F represents the amplitude fluctuation of the rectangular waveguide directional coupler; VSWR represents the standing wave ratio; represents the mean value of the amplitude of all S parameters between two input ports; σ(|S 11 |) represents the standard deviation of the magnitude of all S parameters between the two input ports.

[0066] Understandably, is the coefficient of variation of the magnitude of all S parameters between the two input ports.

[0067] When the standing wave ratio is larger and the coefficient of variation of the amplitude of all S parameters between the two input ports is larger, the possibility of the rectangular waveguide directional coupler being affected by the standing wave during the test process is greater, the possibility of the accuracy of the relevant parameters measured by the network analyzer being affected is greater, and the possibility of inaccurate errors in the test results of the rectangular waveguide directional coupler is greater.

[0068] The flow chart of amplitude fluctuation acquisition is as follows: Figure 2 shown.

[0069] At the same time, when the standing wave in the directional coupler interferes with the transmission signal in the waveguide, the phase of the S parameter will also be affected, and the phase will change from uniform distribution to phase mutation. The standing wave will cause the phase of the S parameter to become periodic.

[0070] The four ports included in the rectangular waveguide directional coupler are an input port, a through port, a coupled port, and an isolated port. Any one of the four ports included in the rectangular waveguide directional coupler is recorded as a target port, and the embodiment is described by taking any one port as an example. The port number of the target port is recorded as m, where m = 1, 2, 3, 4.

[0071] The phase fluctuation of the target port is obtained according to the difference between the phases of the S parameters between the input port and the target port collected at all collection moments.

[0072] Preferably, as an embodiment of the present application, the difference between the phases of the S parameters between the input port and the target port is taken as the phase difference of the target port, the square of the cosine value of the phase difference of the target port is recorded as the absolute phase difference of the target port, and the cumulative sum of the absolute phase differences of the target port at all acquisition moments is recorded as the phase fluctuation of the target port.

[0073] The phase fluctuation of each port of the rectangular waveguide directional coupler can be obtained in the same way, that is, any port of the rectangular waveguide directional coupler has a corresponding phase fluctuation.

[0074] Specifically, the calculation formula for the phase fluctuation of any port of the rectangular waveguide directional coupler is:

[0075]

[0076] Where, X m represents the phase fluctuation of the port numbered m of the rectangular waveguide directional coupler; N represents the first preset threshold value, and the value of the first preset threshold value in this embodiment is 81; represents the phase of the S parameter between the port numbered 1 and the port numbered m collected at the f-th collection time; It represents the mean value of the phase of the S parameter between the port numbered 1 and the port numbered m collected at all acquisition moments; cos() represents the cosine function.

[0077] in, It represents the phase difference of the port with port number m. Indicates the absolute phase difference of the port numbered m.

[0078] When the periodicity of the phase of the S parameter between the input port and the target port is more obvious, the difference between the phases of the S parameters between the input port and the target port collected at all acquisition moments is smaller, and the phase fluctuation of the target port is smaller. At this time, the standing wave in the directional coupler interferes more obviously with the transmission signal in the waveguide.

[0079] According to the phase fluctuation degree of any port of the rectangular waveguide directional coupler and the amplitude fluctuation degree of the rectangular waveguide directional coupler, the standing wave fluctuation degree of any port of the rectangular waveguide directional coupler is obtained.

[0080] Preferably, as an embodiment of the present application, a linear normalized value of the ratio of the amplitude fluctuation of the rectangular waveguide directional coupler to the phase fluctuation of the target port is recorded as the standing wave fluctuation of the target port.

[0081] Specifically, the calculation formula for the standing wave fluctuation degree of any port of the rectangular waveguide directional coupler is:

[0082]

[0083] In the formula, ζ m represents the standing wave fluctuation of the port numbered m of the rectangular waveguide directional coupler; X m represents the phase fluctuation of the port labeled m of the rectangular waveguide directional coupler; F represents the amplitude fluctuation of the rectangular waveguide directional coupler; norm() represents the linear normalization function.

[0084] When the amplitude fluctuation of the rectangular waveguide directional coupler is larger and the phase fluctuation of the target port is smaller, the standing wave fluctuation of the target port is larger. At this time, the standing wave in the directional coupler interferes more obviously with the transmission signal in the waveguide.

[0085] At this point, the standing wave fluctuation degree of any port of the rectangular waveguide directional coupler is obtained.

[0086] Step S003, determining the coupling hole interference of the rectangular waveguide directional coupler according to the diameter and number of the coupling holes of the rectangular waveguide directional coupler, the wave impedance of the waveguide, the input impedance of the coupling holes, and the S parameter between the two input ports, and obtaining the correction coefficient of the target port of the rectangular waveguide directional coupler according to the coupling hole interference of the rectangular waveguide directional coupler and the standing wave fluctuation degree of the target port of the rectangular waveguide directional coupler.

[0087] Based on the small hole coupling theory, the waveguide wall connecting the main and auxiliary waveguides of the rectangular waveguide directional coupler contains multiple coupling holes. The coupling holes can provide more energy transmission paths and help energy flow. The number and diameter of the coupling holes will affect the coupling strength and the possibility of standing waves. When the number of coupling holes is large and the diameter is large, the possibility of standing waves is greater.

[0088] In this embodiment, the diameters of the coupling holes of the rectangular waveguide directional coupler are consistent. Since the impedance of the rectangular waveguide directional coupler is mainly caused by the coupling hole, the input impedance at the coupling hole can be represented by the equivalent impedance at the port.

[0089] According to the S parameter between the two input ports, the wave impedance of the waveguide of the rectangular waveguide directional coupler is adjusted to obtain the input impedance of the coupling hole of the rectangular waveguide directional coupler.

[0090]

[0091] In the formula, Z c Represents the input impedance of the coupling hole of the rectangular waveguide directional coupler; It represents the average value of all S parameters between two input ports. 0 The wave impedance of the waveguide of the rectangular waveguide directional coupler is obtained by querying the parameters provided in the specification of the rectangular waveguide directional coupler in this embodiment.

[0092] The coupling hole interference degree of the rectangular waveguide directional coupler is determined according to the diameter and number of the coupling holes of the rectangular waveguide directional coupler, the wave impedance of the waveguide and the input impedance of the coupling holes.

[0093] Preferably, as an embodiment of the present application, the ratio of the wave impedance of the waveguide of the rectangular waveguide directional coupler to the input impedance is recorded as the waveguide influence of the rectangular waveguide directional coupler, and the linear normalized value of the product of the waveguide influence of the rectangular waveguide directional coupler and the diameter of the coupling hole and the number of coupling holes is recorded as the coupling hole interference of the rectangular waveguide directional coupler.

[0094] Specifically, the calculation formula for the coupling hole interference of the rectangular waveguide directional coupler is:

[0095]

[0096] Where, Γ represents the coupling hole interference of the rectangular waveguide directional coupler; Z 0 Represents the wave impedance of the waveguide of the rectangular waveguide directional coupler; Z c represents the input impedance of the coupling hole of the rectangular waveguide directional coupler; d represents the diameter of the coupling hole of the rectangular waveguide directional coupler; I represents the number of coupling holes of the rectangular waveguide directional coupler; norm() represents the linear normalization function.

[0097] When the wave impedance of the waveguide of the rectangular waveguide directional coupler is larger than the input impedance, and the diameter of the coupling hole and the number of coupling holes are larger, the coupling hole interference of the rectangular waveguide directional coupler is greater. At this time, the possibility of the formation of standing waves is greater, the possibility of the accuracy of the relevant parameters measured by the network analyzer being affected is greater, and the possibility of inaccurate errors in the test results of the rectangular waveguide directional coupler is greater.

[0098] According to the coupling hole interference degree of the rectangular waveguide directional coupler and the standing wave fluctuation degree of the target port of the rectangular waveguide directional coupler, a correction coefficient of the target port of the rectangular waveguide directional coupler is obtained.

[0099] Preferably, as an embodiment of the present application, the linear normalized value of the sum of the coupling hole interference of the rectangular waveguide directional coupler and the standing wave fluctuation degree of the target port of the rectangular waveguide directional coupler is recorded as the correction coefficient of the target port of the rectangular waveguide directional coupler.

[0100] Specifically, the calculation formula for the correction coefficient of any port of the rectangular waveguide directional coupler is:

[0101]

[0102] In the formula, represents the correction coefficient of the port numbered m of the rectangular waveguide directional coupler; ζ m represents the standing wave fluctuation degree of the port labeled m of the rectangular waveguide directional coupler; Γ represents the coupling hole interference degree of the rectangular waveguide directional coupler; norm() represents the linear normalization function.

[0103] It can be understood that the coupling hole interference of the rectangular waveguide directional coupler is a negative number, so the correction coefficient of any port of the rectangular waveguide directional coupler is a complex number.

[0104] At this point, the correction coefficient of any port of the rectangular waveguide directional coupler is obtained.

[0105] Step S004, correcting the S parameter matrix according to the correction coefficients of all ports of the rectangular waveguide directional coupler to obtain a corrected S parameter matrix, and obtaining a test result of the rectangular waveguide directional coupler according to the corrected S parameter matrix.

[0106] The S parameter matrix A is corrected according to the correction coefficients of all ports of the rectangular waveguide directional coupler to obtain a corrected S parameter matrix A′.

[0107]

[0108] It can be understood that each S parameter matrix has a corresponding modified S parameter matrix. Since a total of S parameter matrices of the first preset threshold number of acquisition moments are obtained, there are a total of first preset threshold number of corresponding modified S parameter matrices, where the value of the first preset threshold in this embodiment is 81.

[0109] At this point, a modified S parameter matrix of each S parameter matrix is ​​obtained.

[0110] For each corrected S parameter matrix, the corrected S parameter matrix is ​​used as the S parameter matrix required in the test process of the rectangular waveguide directional coupler. The rectangular waveguide directional coupler is tested using a network analyzer, and the three-dimensional electromagnetic simulation software HFSS is used to obtain the average error between the coupling degree and the simulated coupling degree.

[0111] The mean of the average errors of the coupling degrees corresponding to all modified S parameter matrices and the simulated coupling degrees is calculated. When the mean is less than the second preset threshold, the rectangular waveguide directional coupler test is deemed to be qualified. When the mean is greater than or equal to the second preset threshold, the rectangular waveguide directional coupler test is deemed to be unqualified.

[0112] In this embodiment, the value of the second preset threshold is 0.5dB.

[0113] At this point, the rectangular waveguide directional coupler test is completed.

[0114] Based on the same inventive concept as the above method, an embodiment of the present invention also provides a rectangular waveguide directional coupler testing system, comprising a memory, a processor, and a computer program stored in the memory and running on the processor, wherein when the processor executes the computer program, the steps of any one of the above rectangular waveguide directional coupler testing methods are implemented.

[0115] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A rectangular waveguide directional coupler testing method, characterized in that: The method comprises the following steps: Collecting S parameters between every two ports of a rectangular waveguide directional coupler at different collection times within a local time period, and determining an S parameter matrix at the same collection time according to all S parameters collected at the same collection time, wherein the rectangular waveguide directional coupler includes an input port, a through port, a coupling port, and an isolation port; The standing wave ratio is calculated according to all S parameter matrices, and the amplitude fluctuation of the rectangular waveguide directional coupler is obtained according to the difference between the amplitudes of the S parameters between every two input ports and the standing wave ratio. Any port of the rectangular waveguide directional coupler is recorded as the target port, and the standing wave fluctuation of the target port is obtained by combining the difference between the phases of the S parameters collected at all acquisition times between the input port and the target port; Determine the coupling hole interference of the rectangular waveguide directional coupler according to the diameter and number of the coupling holes of the rectangular waveguide directional coupler, the wave impedance of the waveguide, the input impedance of the coupling holes, and the S parameter between the two input ports; obtain the correction coefficient of the target port of the rectangular waveguide directional coupler according to the coupling hole interference of the rectangular waveguide directional coupler and the standing wave fluctuation degree of the target port of the rectangular waveguide directional coupler; The S parameter matrix is ​​corrected according to the correction coefficients of all ports of the rectangular waveguide directional coupler to obtain the corrected S parameter matrix, and the test result of the rectangular waveguide directional coupler is obtained according to the corrected S parameter matrix.

2. A rectangular waveguide directional coupler testing method according to claim 1, characterized in that: The same All S parameters collected at a collection time, determining the S parameter matrix at the same collection time, including the specific method of: The S parameter matrix A at the same acquisition time is: Where A represents the S parameter matrix; the input port, through port, coupled port, and isolated port are labeled 1, 2, 3, and 4 respectively. uv Represents the S parameter between a port labeled u and a port labeled v, where u = 1, 2, 3, 4 and v = 1, 2, 3, 4.

3. A rectangular waveguide directional coupler testing method according to claim 1, characterized in that: The amplitude fluctuation degree of the rectangular waveguide directional coupler includes the following specific methods: The product of the coefficient of variation of the amplitude of all collected S parameters between two input ports and the standing wave ratio is recorded as the amplitude fluctuation of the rectangular waveguide directional coupler.

4. A rectangular waveguide directional coupler testing method according to claim 1, characterized in that: The specific method of combining the difference between the phases of the S parameters between the input port and the target port collected at all collection moments to obtain the standing wave fluctuation degree of the target port includes: The difference between the phases of the S parameters between the input port and the target port is taken as the phase difference of the target port, the square of the cosine value of the phase difference of the target port is recorded as the absolute phase difference of the target port, and the cumulative sum of the absolute phase differences of the target port at all acquisition moments is recorded as the phase fluctuation of the target port; The standing wave fluctuation degree of the target port of the rectangular waveguide directional coupler is obtained according to the phase fluctuation degree of the target port of the rectangular waveguide directional coupler and the amplitude fluctuation degree of the rectangular waveguide directional coupler.

5. A rectangular waveguide directional coupler testing method according to claim 4, characterized in that: The method of obtaining the standing wave fluctuation degree of the target port of the rectangular waveguide directional coupler according to the phase fluctuation degree of the target port of the rectangular waveguide directional coupler and the amplitude fluctuation degree of the rectangular waveguide directional coupler comprises the following specific methods: The linear normalized value of the ratio of the amplitude fluctuation of the rectangular waveguide directional coupler to the phase fluctuation of the target port is recorded as the standing wave fluctuation of the target port.

6. A rectangular waveguide directional coupler testing method according to claim 1, characterized in that: The coupling hole interference degree of the rectangular waveguide directional coupler includes the following specific methods: According to the S parameters between the two input ports, the wave impedance of the waveguide of the rectangular waveguide directional coupler is adjusted to obtain the input impedance of the coupling hole of the rectangular waveguide directional coupler. The calculation formula of the input impedance of the coupling hole of the rectangular waveguide directional coupler is: In the formula, Z c It represents the input impedance of the coupling hole; Represents the average value of all collected S parameters between two input ports; the wave impedance of the waveguide of the Z0 rectangular waveguide directional coupler; The coupling hole interference degree of the rectangular waveguide directional coupler is determined according to the diameter and number of the coupling holes of the rectangular waveguide directional coupler, the wave impedance of the waveguide and the input impedance of the coupling holes.

7. A rectangular waveguide directional coupler testing method according to claim 1, characterized in that: The method of determining the coupling hole interference degree of the rectangular waveguide directional coupler according to the diameter and number of the coupling holes of the rectangular waveguide directional coupler, the wave impedance of the waveguide and the input impedance of the coupling holes includes: The ratio of the wave impedance of the waveguide of the rectangular waveguide directional coupler to the input impedance is recorded as the waveguide influence of the rectangular waveguide directional coupler, and the linear normalized value of the product of the waveguide influence of the rectangular waveguide directional coupler and the diameter of the coupling hole and the number of coupling holes is recorded as the coupling hole interference of the rectangular waveguide directional coupler.

8. A rectangular waveguide directional coupler testing method according to claim 1, characterized in that: The method of obtaining the correction coefficient of the target port of the rectangular waveguide directional coupler according to the coupling hole interference degree of the rectangular waveguide directional coupler and the standing wave fluctuation degree of the target port of the rectangular waveguide directional coupler includes the following specific methods: The linear normalized value of the sum of the coupling hole interference of the rectangular waveguide directional coupler and the standing wave fluctuation degree of the target port of the rectangular waveguide directional coupler is recorded as the correction coefficient of the target port of the rectangular waveguide directional coupler.

9. A rectangular waveguide directional coupler testing method according to claim 2, characterized in that: The method of correcting the S parameter matrix according to the correction coefficients of all ports of the rectangular waveguide directional coupler, obtaining the corrected S parameter matrix, and obtaining the test result of the rectangular waveguide directional coupler according to the corrected S parameter matrix includes the following specific methods: The S parameter matrix A is corrected according to the correction coefficients of all ports of the rectangular waveguide directional coupler to obtain the corrected S parameter matrix A′, where: It represents the correction coefficient of the port numbered m of the rectangular waveguide directional coupler, where m = 1, 2, 3, 4; For each corrected S parameter matrix, the corrected S parameter matrix is ​​used as the S parameter matrix required in the test process of the rectangular waveguide directional coupler, and the rectangular waveguide directional coupler test is performed using a network analyzer, and the three-dimensional electromagnetic simulation software HFSS is used to obtain the average error between the coupling degree and the simulated coupling degree; The mean of the average error between the coupling degree corresponding to all modified S parameter matrices and the simulated coupling degree is calculated. When the mean is less than the second preset threshold, the rectangular waveguide directional coupler test is deemed to be qualified; when the mean is greater than or equal to the second preset threshold, the rectangular waveguide directional coupler test is deemed to be unqualified.

10. A rectangular waveguide directional coupler test system, comprising a memory, a processor, and a computer program stored in the memory and running on the processor, characterized in that: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 9 are implemented.

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