A Ku / Ka dual-band splitter and design method

Abstract

The present application relates to a Ku / Ka dual-band splitter and a design method, and relates to the field of electromagnetic field technology. The method includes: selecting the large opening size of the square waveguide of the dual-band splitter and the small opening size of the square waveguide according to the frequency of the transmission signal and the cutoff waveguide size of the square waveguide; obtaining the overall size design of the splitter body according to the large opening size, the small opening size, and the coupling hole size; after cascading the fold filter at the sidewall coupling port, adjusting the parameters of the fold filter with the multi-port S parameters of the dual-band splitter as the optimization target, obtaining the filter size design of the sidewall filter; combining the overall size design and the filter size design to obtain the overall design of the dual-band splitter. The present application has the effect of ensuring the performance of the splitter and improving the design efficiency.

Description

Technical Field

[0001] The present application relates to the field of electromagnetic field technology, and in particular to a Ku / Ka dual-band splitter and a design method thereof. Background Art

[0002] A Ku / Ka dual-band splitter is a microwave device used to separate or combine Ku-band (12-18 GHz) and Ka-band (26.5-40 GHz) signals in satellite communication systems. This device plays an important role in modern satellite communication systems.

[0003] The design of a Ku / Ka dual-band splitter relies on simulation software (such as HFSS). For example, the splitter's specifications and topology are first determined. Initial parameters are calculated based on these specifications and topology, and then the entire model is built in HFSS using these initial parameters. After modeling is complete, the splitter model is optimized and simulated until the splitter's actual performance meets the requirements.

[0004] Regarding the above-mentioned related technologies, the entire process relies heavily on simulation software, but simulation software takes a long time to model and optimize, resulting in low design efficiency. Summary of the Invention

[0005] In order to ensure the performance of the splitter and improve the design efficiency, the present application provides a Ku / Ka dual-band splitter and a design method.

[0006] In a first aspect, the present application provides a design method for a Ku / Ka dual-band splitter, which adopts the following technical solution:

[0007] A design method for a Ku / Ka dual-band splitter, comprising:

[0008] The large opening size of the square waveguide of the dual-band splitter and the small opening size of the square waveguide are selected according to the frequency of the transmission signal and the cutoff waveguide size of the square waveguide. The dual-band splitter includes a splitter body and a sidewall filter, and the sidewall filter is connected to the sidewall coupling hole of the splitter body.

[0009] Selecting the coupling hole size of the sidewall coupling hole according to the coupling frequency band and the size of the cutoff waveguide;

[0010] According to the large opening size, the small opening size and the coupling hole size, the overall size design of the splitter body is obtained;

[0011] After the sidewall coupling hole cascaded corrugation filter, taking the multi-port S parameters of the dual-band splitter as the optimization target, adjusting the parameters of the corrugation filter to obtain the filter size design of the sidewall filter;

[0012] The overall size design and the filter size design are combined to obtain the overall design of the dual-band splitter.

[0013] By adopting this technical solution, the large and small aperture sizes are selected based on the frequency of the transmitted signal and the cutoff waveguide dimensions of the square waveguide. The coupling aperture dimensions are then determined based on the coupling frequency band and the cutoff waveguide dimensions, resulting in a body dimension design. The filter dimension design is then determined using S-parameters. Combining the body and filter dimension designs, the overall design of the dual-band splitter is achieved. This technical solution combines the physical and simulated design of the dual-band splitter, ensuring its performance. Furthermore, since the filter dimension design is generated using S-parameters, the computational complexity is relatively low, resulting in high design efficiency.

[0014] Optionally, the wrinkle filter includes n sub-filters, where n is a preset positive integer;

[0015] Take the i-th sub-filter to the i+k-th sub-filter among the n sub-filters, where i is an integer with an initial value of 1 and k is a preset positive integer;

[0016] Updating and adjusting filter parameters of the i-th segment sub-filter to the i+k-th segment sub-filter;

[0017] Calculating current S parameters of the dual-band splitter;

[0018] Calculating an S parameter difference between the current S parameter and a preset S parameter;

[0019] Repeat the above three steps until the preset iteration end condition is met and the S parameter difference set is obtained;

[0020] If the minimum value in the S parameter difference set is greater than the preset difference value, the filter parameters of the i-th sub-filter to the i+k-th sub-filter are fixed to the filter parameters corresponding to the minimum value, and after updating i to i+k+1, the above five steps are repeated;

[0021] If the minimum value in the S parameter difference set is not greater than the preset difference, the filter parameters corresponding to the minimum value are output to obtain the filter size design.

[0022] By adopting the above technical solution, the current S parameters are taken as the optimization target, and the various parameters of the sub-filter are used as variables for optimization calculation. The parameter size of the filter can be quickly obtained, which reduces the amount of calculation in the design process and improves the design efficiency.

[0023] Optionally, initial S parameters of the dual-band splitter are obtained based on the overall size design, where the initial S parameters are S parameters of the dual-band filter when the corrugated filter is not cascaded to the sidewall coupling hole;

[0024] The current S parameters are calculated based on the filter parameters of the wrinkle filter and the initial S parameters.

[0025] By adopting the above technical solution and using the initial S parameters to calculate the current S parameters, not only can the current S parameters be output quickly, but the accuracy of the current S parameters is also guaranteed.

[0026] Optionally, the transmission signal includes Ku band and Ka band;

[0027] Obtaining a first transmittable square waveguide size corresponding to the lowest frequency signal in the Ku band of the transmission signal;

[0028] Generating the large opening size according to the first transmissive square waveguide size, so that the large opening size is larger than the first transmissive square waveguide size;

[0029] Obtaining the size of a second transmissible square waveguide corresponding to the lowest frequency signal in the Ka band of the transmission signal;

[0030] Obtaining a first cutoff waveguide size corresponding to the highest frequency signal in the Ku band of the transmission signal;

[0031] The aperture size is generated according to the second transmissive square waveguide size and the first cutoff waveguide size, and the aperture size is larger than the second transmissive square waveguide size and smaller than the first cutoff waveguide size.

[0032] By adopting the above technical solution, a large aperture size is generated according to the size of the first transmissive square waveguide, and a small aperture size is generated according to the size of the second transmissive square waveguide and the size of the first cutoff waveguide, thereby ensuring that the large aperture size and the small aperture size meet the design requirements of the dual-band splitter and the performance of the splitter.

[0033] Optionally, the sidewall coupling hole includes a first sidewall coupling hole and a second sidewall coupling hole;

[0034] Acquire a Ku-band low-frequency signal and a Ku-band high-frequency signal of the transmission signal;

[0035] Obtaining a dimension of a third transmissible square waveguide corresponding to the lowest frequency signal among the Ku-band low-frequency signals;

[0036] generating a first coupling hole size of the first sidewall coupling hole according to the third transmissive square waveguide size, so that the first coupling hole size is larger than the third transmissive square waveguide size;

[0037] Acquire a fourth transmissible square waveguide size corresponding to the lowest frequency signal among the Ku-band high-frequency signals and a second cutoff waveguide size corresponding to the highest frequency signal among the Ku-band low-frequency signals;

[0038] The second coupling hole size of the second sidewall coupling hole is obtained according to the fourth transmissive square waveguide size and the second cutoff waveguide size, so that the second coupling hole size is larger than the fourth transmissive square waveguide size and smaller than the second cutoff waveguide size.

[0039] By adopting the above technical solution, the first coupling hole size of the first sidewall coupling hole is generated according to the third transmissive square waveguide size, and the second coupling hole size of the second sidewall coupling hole is obtained according to the fourth transmissive square waveguide size and the second cutoff waveguide size. This ensures that the first coupling hole size and the second coupling hole size meet the design requirements of the dual-band splitter and ensures the performance of the splitter.

[0040] Optionally, adjusting the transition angle of the splitter body and the position of the sidewall coupling hole, taking high-order mode transmission and standing wave as optimization directions, to obtain a target transition angle and target position;

[0041] Obtaining a main body size design of the splitter body according to the large opening size, the small opening size, and the target transition inclination angle;

[0042] According to the coupling hole size and the target position, the side wall coupling hole is added to the main body size design to obtain the overall size design.

[0043] By adopting this technical solution, the transition angle of the splitter body and the position of the sidewall coupling holes were adjusted, optimizing for high-order mode transmission and standing waves to achieve the target transition angle and position. This solution ensured that the body dimensions met the design standards and guaranteed the splitter's performance.

[0044] Optionally, adjusting the transition inclination angle of the splitter body and adjusting the position of the sidewall coupling hole;

[0045] Obtaining temporary high-order mode transmission and temporary standing wave corresponding to the dual-band splitter;

[0046] If the temporary higher-order mode transmission is greater than the preset higher-order mode transmission threshold, or the temporary standing wave is greater than the preset standing wave threshold, repeat the above two steps;

[0047] If the temporary high-order mode transmission is not greater than a preset high-order mode transmission threshold, and the temporary standing wave is not greater than a preset standing wave threshold, the transition tilt angle corresponding to the temporary high-order mode transmission is taken as the target transition tilt angle, and the position of the sidewall coupling hole corresponding to the temporary standing wave is taken as the target position.

[0048] By adopting the above technical solution, the target transition inclination angle and target position can make the temporary high-order mode transmission no greater than the preset high-order mode transmission threshold, and the temporary standing wave no greater than the preset standing wave threshold, thereby ensuring that the design of the splitter body meets the requirements and the performance of the splitter is guaranteed.

[0049] In a second aspect, the present application provides a Ku / Ka dual-band splitter, which is obtained by any of the above-mentioned design methods for a Ku / Ka dual-band splitter.

[0050] By adopting the above technical solution, the large and small aperture sizes are selected based on the frequency of the transmitted signal and the cutoff waveguide size of the square waveguide. The coupling aperture size is then selected based on the coupling frequency band and the cutoff waveguide size, resulting in an overall dimensional design. The filter size design is then determined using S-parameters. Combining the overall dimensional design with the filter size design yields the overall design of the dual-band splitter. This technical solution combines the physical design and simulation design of the dual-band splitter, ensuring its performance. Furthermore, since the filter size design is generated using S-parameters, the computational complexity is relatively small, resulting in high design efficiency.

[0051] In summary, this application includes at least one of the following beneficial technical effects:

[0052] 1. The large and small aperture sizes are selected based on the frequency of the transmitted signal and the cutoff waveguide size of the square waveguide. The coupling hole size is then selected based on the coupling frequency band and the cutoff waveguide size, resulting in an overall size design. The filter size design is then determined using S parameters. The overall size design and filter size design are combined to obtain the overall design of the dual-band splitter. This technical solution combines the physical design and simulation design of the dual-band splitter, ensuring its performance. Furthermore, the filter size design is generated using S parameters, resulting in a relatively small amount of calculation and high design efficiency.

[0053] 2. Taking the current S parameters as the optimization target and the various parameters of the sub-filter as variables for optimization calculation, the parameter size of the filter can be quickly obtained, which reduces the amount of calculation in the design process and improves the design efficiency;

[0054] 3. Generate a large aperture size based on the first transmissive square waveguide size, and generate a small aperture size based on the second transmissive square waveguide size and the first cutoff waveguide size, thereby ensuring that the large aperture size and the small aperture size meet the design requirements of the dual-band splitter and guarantee the performance of the splitter. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figure 1 This is a flow chart of a design method for a Ku / Ka dual-band splitter provided in an embodiment of the present application.

[0056] Figure 2This is a flow chart of a method for obtaining large mouth size and small mouth size provided in an embodiment of the present application.

[0057] Figure 3 This is a flow chart of a method for obtaining the size of a sidewall coupling hole provided in an embodiment of the present application.

[0058] Figure 4 This is a flow chart of a method for generating filter size design provided in an embodiment of the present application.

[0059] Figure 5 It is a flow chart of a method for generating a main body size design provided in an embodiment of the present application.

[0060] Figure 6 It is a flow chart of a method for obtaining a target transition inclination angle and a target position provided in an embodiment of the present application.

[0061] Figure 7 This is a curve chart of the Ku low-frequency S-parameter simulation results provided in an embodiment of the present application.

[0062] Figure 8 This is a curve diagram of a Ku high-frequency S-parameter simulation result provided in an embodiment of the present application.

[0063] Figure 9 This is a curve diagram of the Ka low-frequency S-parameter simulation results provided in an embodiment of the present application.

[0064] Figure 10 This is a curve chart of the Ka high-frequency S-parameter simulation results provided in an embodiment of the present application. DETAILED DESCRIPTION

[0065] In order to make the purpose, technical solutions and advantages of this application more clear, the following Figure 1 To the attached Figure 10 It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application.

[0066] This application provides a Ku / Ka dual-band splitter, comprising a splitter body and sidewall filters. The splitter body is tapered, with a large square waveguide opening at one end and a small square waveguide opening at the other. A transition slope is provided between the large and small square waveguide openings. There are at least two sidewall filters, which are disposed on the sidewalls of the splitter body.

[0067] The present application embodiment discloses a design method for a Ku / Ka dual-band splitter. Figure 1 , the method comprising:

[0068] Step S101: According to the frequency of the transmission signal and the cutoff waveguide size of the square waveguide, the large port size of the square waveguide large port and the small port size of the square waveguide small port of the dual-band splitter are selected. The dual-band splitter includes a splitter body and a sidewall filter. The sidewall filter is connected to the sidewall coupling hole of the splitter body.

[0069] The transmission signal includes Ku-band and Ka-band signals.

[0070] A square waveguide is a structure used to transmit electromagnetic waves. It can be a rectangular metal pipe that transmits electromagnetic waves. The cutoff size of a square waveguide is designed based on the frequency of the transmitted signal. The cutoff size must be at least larger than the minimum frequency of the transmitted signal to ensure that the signal can be transmitted through the square waveguide.

[0071] Optionally, in the present application, the large square waveguide opening and the small square waveguide opening of the dual-band splitter are both square.

[0072] In a specific example, the large opening of the square waveguide is used to input Ku / Ka band signals, the sidewall coupling hole is used to couple out Ku band low frequency signals and Ku band high frequency signals, and the small opening of the square waveguide is used to output Ka band signals.

[0073] The sidewall coupling holes are specifically arranged on the transition slope between the large square waveguide opening and the small square waveguide opening. The number of the sidewall coupling holes is consistent with the number of the sidewall filters, and the sidewall coupling holes correspond to the sidewall filters one by one.

[0074] In an optional embodiment provided in this application, the large mouth size and the small mouth size can be obtained by following steps S1011 to S1015, as shown in the following details:

[0075] Step S1011: obtaining the first transmissible square waveguide size corresponding to the lowest frequency signal in the Ku band of the transmission signal.

[0076] The first transmittable waveguide size refers to the waveguide size that can transmit the lowest frequency signal in the Ku band.

[0077] For a square waveguide, the cutoff wavelength and side length are related by the following equation: λmin ≤ 2a, where λmin represents the cutoff wavelength, a represents the side length, and the cutoff wavelength represents the maximum permissible wavelength of an electromagnetic wave in the waveguide. Therefore, the dimensions of the first transmissive square waveguide can be determined using this equation and the lowest Ku-band frequency signal in the transmitted signal.

[0078] Step S1012: generating a large aperture size according to the first transmissive square waveguide size, so that the large aperture size is larger than the first transmissive square waveguide size.

[0079] When the large aperture size is larger than the size of the first transmissive square waveguide, it can be ensured that both Ku-band and Ka-band signals in the transmission signal can be transmitted in the dual-frequency guide splitter, thus avoiding unnecessary signal loss or omission.

[0080] Step S1013: obtaining the size of the second transmissible square waveguide corresponding to the lowest frequency signal in the Ka band of the transmission signal.

[0081] The second transmittable square waveguide size refers to the waveguide size that can transmit the lowest frequency signal in the Ka band.

[0082] Step S1014: obtaining the first cutoff waveguide size corresponding to the highest frequency signal in the Ku band of the transmission signal.

[0083] The first cutoff waveguide size refers to the cutoff waveguide size for the highest frequency signal in the Ku band.

[0084] Step S1015: generating a small aperture size according to the second transmissible square waveguide size and the first cutoff waveguide size, wherein the small aperture size is larger than the second transmissible square waveguide size and smaller than the first cutoff waveguide size.

[0085] When the small port size is larger than the second transmissive square waveguide size and smaller than the first cutoff waveguide size, it can be ensured that the Ka-band signal can be output, but the Ku-band signal cannot be output from the small port size.

[0086] In a specific implementation of this embodiment, assuming that the size of the large opening is a01 and the size of the small opening is a02, then a01 ≥ 14 mm, 8.5 mm ≤ a02 ≤ 10.3 mm.

[0087] Step S102: selecting the coupling hole size of the sidewall coupling hole according to the coupling frequency band and the cutoff waveguide size.

[0088] The size of the coupling hole is related to the pre-designed coupling signal frequency band.

[0089] In an optional embodiment provided herein, if the sidewall coupling apertures need to couple out both Ku-band low-frequency signals and Ku-band high-frequency signals, the sidewall coupling apertures include a first sidewall coupling aperture and a second sidewall coupling aperture. The first sidewall coupling aperture is used to couple out the Ku-band low-frequency signal, and the second sidewall coupling aperture is used to couple out the Ku-band high-frequency signal. Therefore, the sidewall coupling aperture dimensions can be determined by following steps S1021 to S1025, as specifically described below:

[0090] Step S1021: Acquire a Ku-band low-frequency signal and a Ku-band high-frequency signal of the transmission signal.

[0091] The Ku-band low-frequency signal refers to the low-frequency signal in the Ku-band of the transmission signal.

[0092] The Ku-band high-frequency signal refers to the high-frequency signal in the Ku-band of the transmission signal. The frequency band coverage of the Ku-band low-frequency signal and the Ku-band high-frequency signal can be adjusted by technical personnel based on actual needs. This embodiment of the application does not specifically limit the frequency band coverage of the Ku-band low-frequency signal and the Ku-band high-frequency signal.

[0093] For example, the Ku-band frequency of the transmission signal is 13-16 GHz, the Ku-band low-frequency signal can be set to 13-13.5 GHz, and the Ku-band high-frequency signal can be set to 15.5-16 GHz.

[0094] Step S1022: Obtain the size of the third transmissible square waveguide corresponding to the lowest frequency signal among the Ku-band low-frequency signals.

[0095] The third transmittable square waveguide size refers to the waveguide size that can transmit the lowest frequency signal in the Ku band.

[0096] Step S1023: generating a first coupling hole size of the first sidewall coupling hole according to the third transmissive square waveguide size, so that the first coupling hole size is larger than the third transmissive square waveguide size.

[0097] When the size of the first coupling hole is larger than the size of the third transmissive square waveguide, the signal output through the first coupling hole will be limited to the low frequency band of the Ku band.

[0098] Step S1024: obtaining the fourth transmissible square waveguide size corresponding to the lowest frequency signal among the Ku-band high frequency signals and the second cutoff waveguide size corresponding to the highest frequency signal among the Ku-band low frequency signals.

[0099] The fourth transmittable square waveguide size refers to the waveguide size that can transmit the lowest frequency signal among the Ku-band high-frequency signals.

[0100] The second cutoff waveguide size refers to the cutoff waveguide size of the highest frequency signal among the Ku-band low-frequency signals.

[0101] Step S1025: obtaining a second coupling hole size of the second sidewall coupling hole according to the fourth transmissive square waveguide size and the second cutoff waveguide size, so that the second coupling hole size is larger than the fourth transmissive square waveguide size and smaller than the second cutoff waveguide size.

[0102] When the size of the second coupling hole is larger than the size of the fourth transmissive square waveguide and smaller than the size of the second cutoff waveguide, the signal output through the second coupling hole size will be limited to the high frequency band of the Ku band.

[0103] In a specific implementation of this embodiment, assuming that the size of the first coupling hole is a1 and the size of the second coupling hole is a2, then a1 ≥ 14 mm, 10.95 mm ≤ a2 ≤ 11.7 mm.

[0104] Step S103: obtaining the overall size design of the splitter body according to the size of the large port, the size of the small port and the size of the coupling hole.

[0105] The overall size design includes the position of the coupling hole on the side wall, the transition angle of the transition slope, the large mouth size, the small mouth size and the coupling hole size.

[0106] Step S104: After the sidewall coupling hole cascaded corrugation filter, the multi-port S parameters of the dual-band splitter are optimized to adjust the parameters of the corrugation filter to obtain the filter size design of the sidewall filter.

[0107] A corrugation filter is a wave filter based on a periodic corrugated structure. By introducing regular or irregular grooves (or corrugations) on the surface of a waveguide or microstrip transmission line, it leverages the interaction between electromagnetic waves and these structures to achieve specific frequency-selective characteristics (such as bandpass, bandstop, or lowpass filtering). Its core principle is to control the transmission and reflection of electromagnetic waves through periodic impedance modulation or resonant coupling.

[0108] The parameters of the corrugation filter include structural parameters, frequency response parameters, and electromagnetic performance parameters. Optionally, the structural parameters include at least one of the corrugation period, corrugation depth, number of corrugations, and corrugation width of the corrugation filter. The frequency response parameters include at least one of the center frequency, bandwidth, and stopband rejection. The electromagnetic performance parameters include at least one of the insertion loss, out-of-band rejection, and group delay flatness.

[0109] Optionally, in an embodiment of the present application, a pattern matching method is used to optimize the multi-port S parameters of the dual-band splitter and various parameters of the folded filter as variables to obtain the filter size design.

[0110] For example, Figure 7 To the attached Figure 10 The S-parameter simulation results of the embodiment of the present application are shown.

[0111] Step S105: combining the overall size design and the filter size design to obtain the overall design of the dual-band splitter.

[0112] The overall size design and filter size design are integrated into the same dual-band splitter to obtain the overall design of the dual-band filter.

[0113] By adopting the above technical solution, the large and small aperture sizes are selected based on the frequency of the transmitted signal and the cutoff waveguide size of the square waveguide. The coupling aperture size is then selected based on the coupling frequency band and the cutoff waveguide size, resulting in an overall dimensional design. The filter size design is then determined using S-parameters. Combining the overall dimensional design with the filter size design yields the overall design of the dual-band splitter. This technical solution combines the physical design and simulation design of the dual-band splitter, ensuring its performance. Furthermore, since the filter size design is generated using S-parameters, the computational complexity is relatively small, resulting in high design efficiency.

[0114] In the following embodiments, when generating the filter size design, it is necessary to design it according to the structural characteristics of the fold filter to ensure the filtering effect of the fold filter. Therefore, the embodiment of the present application discloses a method for generating the filter size design. Figure 4 , the method comprising:

[0115] Step S401: taking the i-th sub-filter to the i+k-th sub-filter among the n sub-filters, where i is an integer with an initial value of 1 and k is a preset positive integer.

[0116] The wrinkle filter consists of n sub-filters, where n is a preset positive integer. The sub-filters are numbered starting from the point closest to the sidewall coupling hole. That is, the closer the sub-filter is to the sidewall coupling hole, the smaller its corresponding number. For example, the first sub-filter is directly connected to the sub-filter of the sidewall coupling hole.

[0117] Step S402: updating and adjusting the filter parameters of the i-th sub-filter to the i+k-th sub-filter.

[0118] In some embodiments, a preset program algorithm may be used to update and adjust one or more filter parameters of the i-th sub-filter to the i+k-th sub-filter. The program algorithm used in this embodiment may be set by a technician according to actual conditions.

[0119] In some embodiments, the value of k may vary with the number of iterations. For example, in the first iteration, k is 2. In the second iteration, k is 3.

[0120] Step S403: Calculate the current S parameters of the dual-band demultiplexer.

[0121] S-parameters (Scattering Parameters) are indicators that describe the input and output characteristics of linear networks. They quantify the transmission and reflection performance of a dual-band splitter by analyzing the relationship between the incident and reflected waves.

[0122] Step S404: Calculate the S parameter difference between the current S parameter and the preset S parameter.

[0123] The preset S parameters are preset empirical values. The preset S parameters are related to the design indicators of the dual-band splitter. Technical personnel can adjust the values ​​of the preset S parameters according to actual design requirements.

[0124] The S-parameter difference is used to measure the difference between the current S-parameter and the preset S-parameter. For example, the S-parameter difference is represented by an amplitude difference, which refers to the difference in amplitude between the two S-parameters at the same frequency. Alternatively, the S-parameter difference is represented by a phase difference, which refers to the difference in phase components between the two S-parameters.

[0125] Step S405: Repeat the above three steps until a preset iteration end condition is met, and obtain a set of S parameter difference values.

[0126] The S parameter difference value set includes one or more S parameter difference values ​​obtained in the above steps.

[0127] Repeating the above three steps refers to repeating step S402 to step S404.

[0128] The preset iteration termination conditions include the number of iterations reaching a preset number or the S parameter difference being no greater than a preset difference. If the S parameter difference is no greater than the preset difference, it indicates that the filter parameters corresponding to the S parameter difference have met the design requirements, and the iteration process can be exited.

[0129] Step S406: If the minimum value in the S parameter difference set is greater than the preset difference, the filter parameters of the i-th sub-filter to the i+k-th sub-filter are fixed to the filter parameters corresponding to the minimum value, and after updating i to i+k+1, the above five steps are repeated.

[0130] When the minimum value in the S parameter difference set is greater than the preset difference, it means that no matter how the filter parameters of the sidewall filter change, the design standards cannot be met by relying solely on the 1st to i+kth sub-filters, and the filter parameters after the i+kth sub-filters need to be adjusted. Therefore, i is updated to i+k+1, and the above five steps are repeated to determine whether the updated filter parameters of the i-th to i+k-th sub-filters can meet the design standards of the dual-band splitter after adjustment.

[0131] Repeating the above five steps refers to repeating step S401 to step S405.

[0132] Step S407: If the minimum value in the S parameter difference set is not greater than the preset difference, the filter parameter corresponding to the minimum value is output to obtain the filter size design.

[0133] When the minimum value in the S parameter difference set is not greater than the preset difference value, it indicates that the filter corresponding to the minimum value can meet the design standard of the dual-band splitter.

[0134] By adopting the above technical solution, the current S parameters are taken as the optimization target, and the various parameters of the sub-filter are used as variables for optimization calculation. The parameter size of the filter can be quickly obtained, which reduces the amount of calculation in the design process and improves the design efficiency.

[0135] In the following embodiments, when setting up the splitter body, it is necessary to consider the position of the coupling hole on the splitter body and the transition angle of the transition slope to ensure that the splitter body meets the design requirements. Therefore, the embodiment of this application discloses a method for generating the body size design. Figure 5 , the method comprising:

[0136] Step S501: adjusting the transition angle of the splitter body and the position of the sidewall coupling hole, taking high-order mode transmission and standing waves as optimization directions, to obtain a target transition angle and target position.

[0137] Higher-order mode transmission is the electromagnetic field distribution in square waveguides other than the main mode.

[0138] Standing waves are a phenomenon in which the amplitude of an incident wave and a reflected wave are superimposed on each other in a transmission line or waveguide, resulting in a wave with a fixed distribution in space.

[0139] In actual scenarios, high-order mode transmission and standing waves are both possible phenomena. Therefore, to ensure the splitting effect of the dual-band splitter, the impact of high-order mode transmission and standing waves needs to be minimized. Therefore, the embodiment of the present application can obtain the target transition angle and target position through the following steps S5011 to S5014, as follows:

[0140] Step S5011: adjusting the transition angle of the splitter body and adjusting the position of the sidewall coupling hole.

[0141] In some embodiments, a preset program algorithm can be used to update and adjust the transition angle of the splitter body and the position of the sidewall coupling hole. The program algorithm used in this embodiment can be set by technicians according to actual conditions.

[0142] Step S5012: Acquire temporary high-order mode transmission and temporary standing wave corresponding to the dual-band demultiplexer.

[0143] Temporary high-order mode transmission refers to high-order mode transmission during the iteration process.

[0144] Temporary standing waves refer to standing waves during the iteration process.

[0145] Step S5013: If the temporary higher-order mode transmission is greater than the preset higher-order mode transmission threshold, or the temporary standing wave is greater than the preset standing wave threshold, then repeat the above two steps.

[0146] The high-order mode transmission threshold and the standing wave threshold are preset empirical values. Technical personnel can adjust the specific values ​​of the high-order mode transmission threshold and the standing wave threshold according to actual needs.

[0147] When the temporary high-order mode transmission is greater than the preset high-order mode transmission threshold, or the temporary standing wave is greater than the preset standing wave threshold, it indicates that the transition angle and the position of the sidewall coupling hole still do not meet the design requirements, and the above steps S5011 and S5012 are repeated.

[0148] Step S5014: If the temporary high-order mode transmission is not greater than the preset high-order mode transmission threshold, and the temporary standing wave is not greater than the preset standing wave threshold, the transition tilt angle corresponding to the temporary high-order mode transmission is taken as the target transition tilt angle, and the position of the sidewall coupling hole corresponding to the temporary standing wave is taken as the target position.

[0149] When the temporary high-order mode transmission is not greater than the preset high-order mode transmission threshold, and the temporary standing wave is not greater than the preset standing wave threshold, it means that the transition inclination angle and the position of the sidewall coupling hole at this time have met the design requirements, so the target transition inclination angle and target position are output.

[0150] Step S502: obtaining a main body size design of the splitter body according to the large opening size, the small opening size and the target transition angle.

[0151] The main body size design refers to the size information of the splitter body excluding the side wall coupling hole.

[0152] Step S503: Add the sidewall coupling hole to the main body size design according to the coupling hole size and target position to obtain the overall size design.

[0153] Exemplarily, according to the target position, a sidewall coupling hole is opened in the overall size design, and the overall size design is obtained according to the size of the coupling hole.

[0154] By adopting this technical solution, the transition angle of the splitter body and the position of the sidewall coupling holes were adjusted, optimizing for high-order mode transmission and standing waves to achieve the target transition angle and position. This solution ensured that the overall dimensional design met the design standards and ensured the performance of the splitter.

[0155] The above are all preferred embodiments of the present application and are not intended to limit the scope of protection of this application. Unless otherwise specified, any feature disclosed in this specification (including the abstract and drawings) may be replaced by other equivalent or similar features. In other words, unless otherwise specified, each feature is merely an example of a series of equivalent or similar features.

Claims

1. A design method for a Ku / Ka dual-band splitter, characterized in that: The method comprises: The large opening size of the square waveguide of the dual-band splitter and the small opening size of the square waveguide are selected according to the frequency of the transmission signal and the cutoff waveguide size of the square waveguide. The dual-band splitter includes a splitter body and a sidewall filter, and the sidewall filter is connected to the sidewall coupling hole of the splitter body. Selecting the coupling hole size of the sidewall coupling hole according to the coupling frequency band and the size of the cutoff waveguide; According to the large opening size, the small opening size and the coupling hole size, the overall size design of the splitter body is obtained; After the sidewall coupling hole cascaded corrugation filter, taking the multi-port S parameters of the dual-band splitter as the optimization target, the parameters of the corrugation filter are adjusted to obtain the filter size design of the sidewall filter, wherein the corrugation filter includes n sub-filters, where n is a preset positive integer; Combining the overall size design and the filter size design to obtain the overall design of the dual-band splitter; The method of optimizing the multi-port S parameters of the dual-band splitter and adjusting the parameters of the corrugation filter to obtain the filter size design of the sidewall filter includes: Take the i-th sub-filter to the i+k-th sub-filter among the n sub-filters, where i is an integer with an initial value of 1 and k is a preset positive integer; Updating and adjusting filter parameters of the i-th segment sub-filter to the i+k-th segment sub-filter; Calculating current S parameters of the dual-band splitter; Calculating an S parameter difference between the current S parameter and a preset S parameter; Repeat the above three steps until the preset iteration end condition is met and the S parameter difference set is obtained; If the minimum value in the S parameter difference set is greater than the preset difference value, the filter parameters of the i-th sub-filter to the i+k-th sub-filter are fixed to the filter parameters corresponding to the minimum value, and after updating i to i+k+1, the above five steps are repeated; If the minimum value in the S parameter difference set is not greater than the preset difference, the filter parameters corresponding to the minimum value are output to obtain the filter size design.

2. The design method of a Ku / Ka dual-band splitter according to claim 1, characterized in that: The calculating the current S parameters of the dual-band splitter includes: According to the overall size design, initial S parameters of the dual-band splitter are obtained, wherein the initial S parameters are S parameters of the dual-band splitter when the folded filter is not cascaded with the sidewall coupling hole; The current S parameters are calculated based on the filter parameters of the wrinkle filter and the initial S parameters.

3. The design method of a Ku / Ka dual-band splitter according to claim 1, characterized in that: The transmission signal includes Ku band and Ka band; The method of selecting the large opening size of the square waveguide of the dual-band splitter and the small opening size of the square waveguide according to the frequency of the transmission signal and the cutoff waveguide size of the square waveguide comprises: Obtaining a first transmittable square waveguide size corresponding to the lowest frequency signal in the Ku band of the transmission signal; Generating the large opening size according to the first transmissive square waveguide size, so that the large opening size is larger than the first transmissive square waveguide size; Obtaining the size of a second transmissible square waveguide corresponding to the lowest frequency signal in the Ka band of the transmission signal; Obtaining a first cutoff waveguide size corresponding to the highest frequency signal in the Ku band of the transmission signal; The aperture size is generated according to the second transmissive square waveguide size and the first cutoff waveguide size, and the aperture size is larger than the second transmissive square waveguide size and smaller than the first cutoff waveguide size.

4. The design method of a Ku / Ka dual-band splitter according to claim 1, characterized in that: The side wall coupling hole includes a first side wall coupling hole and a second side wall coupling hole; The step of selecting the coupling hole size of the sidewall coupling hole according to the coupling frequency band and the cutoff waveguide size includes: Acquire a Ku-band low-frequency signal and a Ku-band high-frequency signal of the transmission signal; Obtaining a dimension of a third transmissible square waveguide corresponding to the lowest frequency signal among the Ku-band low-frequency signals; generating a first coupling hole size of the first sidewall coupling hole according to the third transmissive square waveguide size, so that the first coupling hole size is larger than the third transmissive square waveguide size; Acquire a fourth transmissible square waveguide size corresponding to the lowest frequency signal among the Ku-band high-frequency signals and a second cutoff waveguide size corresponding to the highest frequency signal among the Ku-band low-frequency signals; The second coupling hole size of the second sidewall coupling hole is obtained according to the fourth transmissive square waveguide size and the second cutoff waveguide size, so that the second coupling hole size is larger than the fourth transmissive square waveguide size and smaller than the second cutoff waveguide size.

5. The design method of a Ku / Ka dual-band splitter according to claim 1, characterized in that: The overall size design of the splitter body is obtained according to the large opening size, the small opening size and the coupling hole size, including: Adjusting the transition angle of the splitter body and the position of the sidewall coupling hole, taking high-order mode transmission and standing wave as optimization directions, to obtain a target transition angle and target position; Obtaining a main body size design of the splitter body according to the large opening size, the small opening size, and the target transition inclination angle; According to the coupling hole size and the target position, the side wall coupling hole is added to the main body size design to obtain the overall size design.

6. The design method of a Ku / Ka dual-band splitter according to claim 5, characterized in that: The step of adjusting the transition angle of the splitter body and the position of the sidewall coupling hole, taking high-order mode transmission and standing wave as optimization directions, to obtain a target transition angle and a target position, includes: Adjusting the transition inclination angle of the splitter body and adjusting the position of the side wall coupling hole; Obtaining temporary high-order mode transmission and temporary standing wave corresponding to the dual-band splitter; If the temporary higher-order mode transmission is greater than the preset higher-order mode transmission threshold, or the temporary standing wave is greater than the preset standing wave threshold, repeat the above two steps; If the temporary high-order mode transmission is not greater than a preset high-order mode transmission threshold, and the temporary standing wave is not greater than a preset standing wave threshold, the transition tilt angle corresponding to the temporary high-order mode transmission is taken as the target transition tilt angle, and the position of the sidewall coupling hole corresponding to the temporary standing wave is taken as the target position.

7. A Ku / Ka dual-band splitter, characterized in that: The Ku / Ka dual-band splitter is obtained by the design method of the Ku / Ka dual-band splitter according to any one of claims 1 to 6.

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