CN115313004A - Multi-input multi-output cavity output multiplexer and design method - Google Patents
Multi-input multi-output cavity output multiplexer and design method Download PDFInfo
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
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Abstract
The utility model provides a multiple input multiple output cavity output multiplexer, through structurally with a plurality of multiplexer cavitys with combine the integrated design of way structure, the accurate calculation multiplexer with combine the structure size, rationally set up channel filter's coupling matrix, optimize multiplexer and the phase place of combining the structure, realize multiple input multiple output cavity output multiplexer's electrical characteristic design. The problems of secondary cascade of an isolator and a multiplexer in the traditional design are avoided, so that the electrical characteristics are effectively improved, the integral volume and quality of a product are reduced, the system design is greatly simplified, the advantages of flexible use of power amplifiers among different channels, flexible output combination and the like are achieved, and the problem of flexible application of a broadband communication satellite transponder is solved.
Description
Technical Field
The application relates to a multi-input multi-output cavity output multiplexer and a design method, and belongs to the field of microwave filters and multiplexers.
Background
Output multiplexers are an important component of satellite payload transponder systems, and are usually used to implement the combining function of high power channels, and their performance directly affects the communication quality of the transponder channels. With the rapid development of satellite services, the development of broadband communication satellites (HTS satellites) is promoted, and compared with conventional fixed service communication satellites (FSS satellites), the HTS has many advantages such as multi-spot beam coverage, frequency reuse, high gain, and superior anti-interference performance. The mimo multiplexer is a key component of the payload, and its main function is to split, filter and combine the rf channels.
To meet the evolving needs of HTS satellites, mimo multiplexers have come to step into the line of sight, which can arbitrarily combine and output a plurality of narrowband signals from different demultiplexers (DeMUX). The output port of the multiplexer to be combined is connected with other output ports to be combined through an isolator to realize combination. The traditional design can not realize the branching-filtering-combining of multiple input ports, and has complex integral structure and larger volume and weight.
Disclosure of Invention
The invention solves the technical problems that: the multiplexer is used for realizing the main functions of shunting, filtering and resynthesis of multi-path broadband signals aiming at a space high-power broadband communication system. The MIMO multiplexer provided by the invention can remove the isolator by means of circuit synthesis, structure arrangement, simulation optimization and the like on the premise of not reducing design efficiency and design precision, and only needs to design a channel filter once, thereby effectively reducing the integral volume, quality and risk coefficient of the output multiplexer. The product has the advantages of smaller volume, small loss, light weight, low risk coefficient, high integration level, flexible use of the power amplifier by different channels, flexible output combination and the like. The problem of flexible channel application of a broadband communication satellite is solved.
The technical scheme is as follows:
a multiple-input multiple-output cavity output multiplexer, comprising: the multiplexer cavity comprises a multi-branch waveguide and a plurality of channel filters coupled with the multi-branch waveguide, and the multi-branch waveguide is provided with an input port; the side surfaces of the channel filters of different multiplexer cavities are close to each other, the channel filters needing to be combined in different multiplexer cavities are opposite, and the output ports of the opposite channel filters needing to be combined are connected with the same combiner.
And a phase gasket is arranged between the multiplexer cavity and the combiner.
The broadband signal is respectively input into the multiplexer cavity from the input port of the multiplexer cavity, the filter is shunted by the channel filters through the multi-branch waveguide, the shunted narrowband signal realizes frequency synthesis according to application requirements, the multi-input multi-output cavity output multiplexer realizes the functions of shunting, filtering and combining the signal, and the multi-input multi-output cavity output multiplexer comprises the input ports, the output ports and the multi-channel filter.
A plurality of channel filters are designed in the multiplexer cavity to filter signals, the channel filters are divided according to wave beam frequency, and one broadband signal can be divided into a plurality of narrow-band signals according to frequency.
The input signals of different multiplexer cavities are independent broadband signals, and the input signal frequencies are overlapped or different. When signals enter the multiplexer cavity from the input port, the signals enter the channel filter through the multi-branch waveguide shunt for filtering, part of the signals are directly output from the output port, and part of the signals are output from the output port after being combined with other frequency signals through the combiner.
The number of the multiplexer cavities is 2-5, the broadband signal input from the input port of each channel filter is 2-5 paths, and the signal output from the output port is 2-16 paths.
The number of the channel filters contained in each multiplexer cavity is 2-10; each combiner is communicated with 2-4 channel filters, namely the combiner combines the narrow-band signals of the 2-4 channel filters.
The channel filters are square resonant cavities or circular resonant cavities with chamfers, 3-5 resonant cavities are selected from each channel filter, and coupling windows are formed among the resonant cavities. The resonant cavities are arranged in the same plane in the horizontal direction, the vertical direction or the inclined direction.
The channel filter is formed by cascading a plurality of resonators, and the resonators in the invention adopt a cavity structure form, so the resonators are called as resonant cavities.
And a compensation column is designed in the multi-branch waveguide and is positioned on the side wall of the multi-branch waveguide and is right opposite to the resonant cavity of the channel filter.
The two multiplexer cavities which are mutually abutted are processed on the front side and the back side of a structural member. The input port of the multiplexer cavity is in the horizontal direction, and the output port of the multiplexer cavity is in the vertical direction. The input port and the output port are in a waveguide form, a standard waveguide or a height-reduced waveguide is selected, and the multi-input multi-output cavity output multiplexer is vertically or horizontally installed.
The resonator of the channel filter is selected from a waveguide filter, a dielectric filter or a coaxial filter.
And the input coupling quantity and the output coupling quantity of the channel filter with one end coupled with the multi-branch waveguide and one end connected with the combiner are equal.
And the resonant cavities at two ports of the channel filter are subjected to reverse detuning, the frequency of the resonant cavity at one end of the channel filter is higher than the central frequency of the channel filter, and the frequency of the resonant cavity at the other end of the channel filter is lower than the central frequency of the channel filter.
Typically, the resonant cavities at the ends of the channel filter have frequencies that are lower or higher than the center frequency of the channel filter by a variable amount that is 30-70% of the bandwidth of the channel filter.
The center frequency of each channel filter is 3 GHz-50 GHz.
A design method for a multi-input multi-output cavity output multiplexer comprises the following steps:
s1, obtaining an input coupling matrix and an output coupling matrix of a channel filter by combining an input coupling quantity and an output coupling quantity of a coupling matrix of the channel filter with a filter synthesis method;
s2, combining the input and output coupling matrixes of the channel filter, calculating by a characteristic mode solver to obtain the central frequency of the channel filter, and carrying out reverse detuning on the resonant cavities at the two ports of the channel filter according to the central frequency of the channel filter to obtain the frequencies of the resonant cavities at the two ports of the channel filter;
s3, obtaining an inter-cavity coupling window between the resonant cavities of the channel filter in an eigenmode solving mode, establishing a model of the two cavities with the inter-cavity coupling window in commercial simulation software HFSS, and calculating the coupling quantity between the two cavities through a characteristic mode solver, wherein the coupling quantity between the two cavities is equal to the product of a coupling coefficient and a design bandwidth, namely: coup = M ij ×B w Wherein M is ij To correspond to coupling coefficients, in particular M ij Coupling coefficients of the ith row and the jth column of a coupling matrix of the channel filter; b is w Designing a bandwidth; coup is the coupling quantity between the two cavities;
calculating by using the corresponding coupling matrix to obtain an input/output coupling window of the channel filter, and adjusting the size of the coupling window to ensure that the simulated group delay is equal to the group delay calculated by the coupling matrix, thereby obtaining the size of the input/output window coupling window of the filter;
and S4, performing overall simulation on the channel filter according to the calculation results of the steps S1-S3, and designing the specific structure of the multiplexer according to the simulation result.
In summary, the present application at least includes the following beneficial technical effects:
(1) A plurality of functions such as shunting, filtering, combining and the like are integrated through a multiple-input multiple-output multiplexer design technology, and compared with the traditional technology, a filtering unit used in an isolator and combining process is omitted.
(2) The system flexibly uses the power amplifier and the output combination is flexible through the design technology of the multiple-input multiple-output multiplexer, the repeater system can adjust the application state according to the actual use state, the flexible design of the system is realized, and the use efficiency of frequency and power is improved according to the use condition.
(3) The integrated design makes the whole physical structure very compact, and the size is littleer, the quality is lighter.
(4) The electrical performance is improved and the insertion loss of the channel is reduced through the design technology of the multiple-input multiple-output multiplexer.
(5) The invention has flexible design, solves the integrated design of the system under the condition of high power, meets the system requirements under various frequency plans, can meet the increasing application requirements of the communication system at the present stage, achieves the international level in design and has strong competitiveness;
(6) Compared with the traditional output multiplexer which realizes the same function, the product has the advantages of novel structure, smaller size, lighter weight, higher reliability, smaller loss, flexible use of power amplifiers for different channels, flexible output combination and the like.
Drawings
Fig. 1 is an exploded view of an output multiplexer of a mimo cavity according to an embodiment of the present disclosure.
Fig. 2 is a structural diagram of an output multiplexer of a mimo cavity in an embodiment of the present application.
Fig. 3 is a structural diagram of a cavity of the multiplexer according to the embodiment of the present application.
Fig. 4 is a structural diagram of two cavities of the multiplexer in the embodiment of the present application.
Fig. 5 is a structural diagram of a multiplexer triple-cavity in the embodiment of the present application.
Fig. 6 is a structural diagram of a multiplexer cover plate in an embodiment of the present application.
Fig. 7 is a structural diagram of the second combiner in the embodiment of the present application.
Description of reference numerals:
11. a cavity of the multiplexer; 111. a multi-branch waveguide; 112. a channel filter; 1121. a first channel; 1122. a second channel; 1123. a third channel; 1124. a fourth channel; 1125. a fifth channel;
12. a multiplexer II cavity; 121. a sixth channel; 122. a seventh channel; 123. an eighth channel; 124. a ninth channel;
13. a multiplexer with three cavities; 131. a tenth channel; 132. an eleventh channel; 133. a twelfth channel;
21. a first combiner; 22. a second combiner; 221. a combiner housing; 222. a combiner cover plate; 223. a combiner cavity;
31. a first structural member; 32. a second structural member;
41. a first cover plate; 42. a second cover plate; 43. a third cover plate;
5. a compensation column;
6. a phase pad;
7. and (6) inputting the port.
Detailed Description
The present application is described in further detail below with reference to the following figures and specific examples:
the embodiment of the application discloses a multiple-input multiple-output cavity output multiplexer, as shown in fig. 1 and fig. 2, comprising at least two multiplexer cavities, wherein each multiplexer cavity comprises a multi-branch waveguide 111 and a plurality of channel filters 112 coupled with the multi-branch waveguide 111, the multi-branch waveguide 111 is provided with an input port 7, and the channel filters 112 are provided with output ports; the side surfaces of the channel filters 112 of different multiplexer cavities are close to each other, the channel filters 112 of different multiplexer cavities which need to be combined are opposite to each other, and the output ports of the opposite channel filters 112 which need to be combined are connected with the same combiner. The multiplexer cavity and the combining structure are integrated, the functions of branching, filtering and resynthesizing of the multi-path broadband signals of the multiplexer are realized, and the structure is simple.
As shown in fig. 1 and 2, two multiplexer cavities which are in parallel can be respectively positioned on the front and the back of a structural member; the following steps can be also included: the two multiplexer cavities which are in parallel connection are respectively positioned on one side of one structural component, and one sides of the two structural components are in parallel connection. The combiner may be integrated with the structure forming the multiplexer cavity, and a combiner cavity 223 communicating with the different channel filters 112 is provided in the combiner; the following steps can be also included: the combiner comprises a combiner shell 221 and a combiner cover plate 222, wherein the combiner shell 221 is mechanically connected with a structural part provided with a multiplexer cavity, the combiner cover plate 222 covers the opening position of the combiner shell 221 to form a combiner cavity 223, and the combiner cavity 223 is communicated with the channel filter 112. The combiner is composed of two sections of straight waveguides, two standard right-angle waveguide turns and a standard ET junction.
The plurality of channel filters 112 and the plurality of branch waveguides may be machined, and the channel filters 112 may be conventional waveguide filters. The channel filter 112 includes a plurality of resonant cavities, each of which is a square resonant cavity or a circular resonant cavity with a chamfer, and a coupling window is formed between the resonant cavities. The cover plate forms a multiplexer cavity after the cavity. Tuning screws are arranged on the cover plate and used for debugging the frequency and the coupling of the channel filter 112, and the electrical performance requirements of products can be met through debugging. A phase gasket 6 is arranged between the multiplexer cavity and the combiner, and errors caused by machining and simulation can be finely adjusted by changing the thickness of the phase gasket 6, so that better standing wave characteristics are obtained. The multi-branch waveguide 111 is provided with a compensation column 5, and the compensation column 5 is located on the side wall of the multi-branch waveguide 111 opposite to the resonant cavity of the channel filter 112.
The channel filter 112 of the mimo cavity output multiplexer has characteristics with respect to circuit characteristics. Common filter circuit characteristics are often described mathematically using a coupling matrix. Generally, a coupling matrix of a filter is formed by combining double terminals, so that a better standing wave ratio characteristic can be obtained; the channel filter 112 coupling matrix for the adjacent output multiplexers is one-terminal synthesis. For the mimo cavity output multiplexer, the coupling matrix with one end coupled to the multi-branch waveguide 111 and one end connected to the channel filter 112 of the combiner has its own characteristics, and the coupling amount in the coupling matrix tends to be the same for input and output. The resonant cavities at the two ends of the channel filter 112 are reverse detuned, the resonant cavities at one end of the channel filter 112 having a frequency higher than the center frequency of the channel filter 112 and the resonant cavities at the other end of the channel filter 112 having a frequency lower than the center frequency of the channel filter 112. The frequency of the resonant cavity at both ends of the channel filter 112 is lower or higher than the channel filter 112 by a variable value of 30-70% of the bandwidth of the channel filter 112. The center frequency of each channel filter 112 is 3GHz to 50GHz. When the coupling matrix is adopted for optimization simulation, excellent circuit characteristics can be obtained quickly, and the combiner can be structurally integrated with the multiplexer cavity.
In the present embodiment, the multiplexer includes 3 multiplexer cavities and 2 combiners, which are respectively a first multiplexer cavity 11, a second multiplexer cavity 12, a third multiplexer cavity 13, and a first combiner 21 and a second combiner 22.
Specifically, as shown in fig. 1 and 6, the multiplexer includes a first structure member 31, a second structure member 32, a first cover plate 41, a second cover plate 42, a third cover plate 43, a first combiner 21, and a second combiner 22. A first multi-branch waveguide 111 and a plurality of channel filters 112 coupled to the first multi-branch waveguide 111 are disposed on the front surface of the first structural member 31, a second multi-branch waveguide 111 and a plurality of channel filters 112 coupled to the second multi-branch waveguide 111 are disposed on the back surface of the first structural member 31, and the first cover plate 41 and the second cover plate 42 are respectively disposed on the front surface and the back surface of the first structural member 31 to form a first multiplexer cavity 11 and a second multiplexer cavity 12; a third multi-branch waveguide 111 and a plurality of channel filters 112 coupled to the third multi-branch waveguide 111 are disposed on a surface of one side of the second structural member 32, and a third cover plate 43 covers the surface of the second structural member 32 on which the multiplexer triple cavity 13 is disposed, so as to form the multiplexer triple cavity 13.
As shown in fig. 3, the multiplexer-cavity 11 has 5 channel filters 112, which are respectively a first channel 1121 to a fifth channel 1125, and the first channel 1121 to the fifth channel 1125 are respectively a fourth-order generalized chebyshev filter with a zero, a fourth-order chebyshev filter and a third-order chebyshev filter according to requirements. The coupling matrix of the channel filter 112 is the same as that of a typical generalized chebyshev filter, and the existing self-programming can obtain a filter coupling matrix meeting the index requirement by a synthesis and optimization method, and each channel filter 112 has a plurality of coupling quantities such as input/output, main coupling, cross coupling, self coupling and the like, and can correspondingly find the corresponding coupling quantity in the coupling matrix. And synthesizing the coupling matrix of each channel through a self-programming program, and modeling, simulating and optimizing the multiplexer circuit to obtain the multiplexer coupling matrix.
As shown in fig. 4, the multiplexer two-cavity 12 has 4 channel filters 112, which are respectively a sixth channel 121 to a ninth channel 124, and the sixth channel 121 to the ninth channel 124 respectively are a third-order generalized chebyshev filter with a zero, a fourth-order chebyshev filter, and a fourth-order chebyshev filter according to requirements.
As shown in fig. 5, the multiplexer triple cavity 13 has 3 channel filters 112, and the tenth channel 131 to the twelfth channel 133 of the 3 channel filters 112 are respectively a fourth-order generalized chebyshev filter with a zero, and a third-order chebyshev filter according to the requirement.
As shown in fig. 7, the combiner case 221 and the combiner cover 222 of the first combiner 21 are integrally connected to the first structural member 31, and the combiner cavity 223 of the first combiner 21 communicates with the second channel 1122 and the eighth channel 123; the combiner housing 221 of the second combiner 22 is connected to the first structural member 31 and the second structural member 32 by bolts, the combiner cover plate 222 of the second combiner 22 is covered on the opening of the combiner housing 221 to form a combiner cavity 223, and the combiner cavity 223 of the second combiner 22 is communicated with the fifth channel 1125 and the twelfth channel 133.
The input signals of different multiplexer cavities are independent broadband signals, the frequency of the input signals is overlapped or different, three broadband signals are respectively input into the multiplexer cavities from the input ports 7 of the three multiplexer cavities, the filters are divided by the channel filters 112 through the multi-branch waveguide 111, the channel filters 112 are divided according to the wave beam frequency, one broadband signal can be divided into a plurality of narrowband signals according to the frequency, the divided narrowband signals are combined through the combiner according to application requirements, and the multi-input multi-output cavity output multiplexer realizes the functions of signal division, filtering and combination. The mimo multiplexer of the present embodiment includes 3 input ports 7, 10 output ports and 12 channel filters 112.
The design method of the multiplexer is as follows:
s1: the coupling matrix of the channel filter of the multiple-input multiple-output multiplexer adopts the coupling matrix suitable for the multiple-input multiple-output form, is different from the channel filter of the traditional multiplexer, the input and output coupling quantity of the channel filter is the same, and the filter synthesis method is combined.
And S2, establishing a resonator model in commercial simulation software HFSS (high frequency signal-to-noise ratio) and calculating by combining a coupling matrix of the channel filter through a characteristic model solver to obtain the central frequency of the channel filter. A resonant cavity model is established, and the resonant cavity resonates at a required frequency point by adjusting the diameter and the length (length and height) of the resonant cavity, and has a good Q value and a single-mode working bandwidth. Since here a separate resonator is calculated and in practice a coupling window is needed which lowers the resonance frequency of the resonator, here the resonance frequency should be made slightly higher than the desired frequency by 0.5%. And carrying out reverse detuning on the resonant cavities at the two ports of the channel filter according to the obtained central frequency and by combining the bandwidth of the pass-through filter.
And S3, obtaining the coupling window between the cavities in an eigenmode solving mode, establishing a model of the two cavities in commercial simulation software HFSS, and calculating the coupling quantity between the two cavities through a characteristic mode solver. The amount of coupling between the two cavities is equal to the difference between the modes solved, which should be equal to the product of the coupling coefficient and the design bandwidth, i.e.: coup = M ij ×B w Wherein M is ij To correspond to coupling coefficients, in particular M ij Coupling coefficients of the ith row and the jth column of the coupling matrix of the channel filter; b is w Designing a bandwidth; coup is the corresponding actual coupling amount. The input and output coupling windows of the channel filter are calculated by using the corresponding coupling matrix, and the coupling window size is adjustedAnd the simulation group delay is equal to the group delay calculated by the coupling matrix, so that the size of the input and output window of the filter is obtained.
And S4, after the steps S1-S3 are finished, carrying out integral simulation on the channel filter, repeatedly adjusting the sizes of the initial filter size and the window size obtained in the steps, and changing the sizes of the coupling window and the frequency screw by comparing the advantages and disadvantages of the electrical characteristics to finally achieve an excellent simulation result. Of course, other methods may be used for the overall simulation.
And S5, designing the physical size of the cavity filter according to the simulation result, wherein a cover plate of the multiplexer is arranged on the structural member to form a multiplexer cavity, and the multiplexer cavity is provided with an input port and an output port.
The combiner is composed of two sections of straight waveguides, two standard right-angle waveguide turns and a standard ET structure, and a simulation model of the combiner is established in commercial simulation software HFSS. The combiner needs to be simulated jointly with the multiplexer in commercial software Mician, and good performance can be obtained through simulation by adjusting parameters of two sections of straight waveguides of the combiner.
The implementation principle of the application is as follows: the multiplexer with a plurality of input ports and output ports is formed by integrating the structure of the multiplexer and the structure of the multiplexer, broadband signals are respectively input into the multiplexer cavities from the input ports of different multiplexer cavities, the filters are divided by a plurality of channel filters through multi-branch waveguides, the channel filters are divided according to wave beam frequencies, one broadband signal can be divided into a plurality of narrow-band signals according to the frequencies, the divided narrow-band signals are subjected to frequency synthesis through the combiner according to application requirements, and the functions of dividing, filtering and combining signals of the multi-input multi-output cavity output multiplexer are achieved.
The above are preferred embodiments of the present application, and the scope of protection of the present application is not limited thereto, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (10)
1. The utility model provides a multiple input multiple output cavity output multiplexer which characterized in that: the multi-channel filter comprises at least two multiplexer cavities, each multiplexer cavity comprises a multi-branch waveguide (111) and a plurality of channel filters (112) coupled with the multi-branch waveguide (111), and the multi-branch waveguide (111) is provided with an input port (7);
the side surfaces of the channel filters (112) of different multiplexer cavities are close to each other, the channel filters (112) of different multiplexer cavities which need to be combined are opposite, and the output ports of the opposite channel filters (112) which need to be combined are connected with the same combiner.
2. The mimo cavity output multiplexer of claim 1, wherein: and a phase gasket (6) is arranged between the multiplexer cavity and the combiner.
3. The mimo cavity output multiplexer of claim 1, wherein: the input signals of different multiplexer cavities are independent broadband signals, and the input signal frequencies are overlapped or different.
4. The mimo cavity output multiplexer of claim 1, wherein: the channel filter (112) comprises a plurality of resonant cavities, the resonant cavities are square resonant cavities or round resonant cavities with chamfers, and coupling windows are formed among the resonant cavities.
5. The mimo cavity output multiplexer of claim 1, wherein: and a compensation column (5) is arranged in the multi-branch waveguide (111), and the compensation column (5) is positioned on the side wall of the resonant cavity of the multi-branch waveguide (111) opposite to the channel filter (112).
6. The mimo cavity output multiplexer of claim 1, wherein: the two multiplexer cavities that lean against each other are located the front and the reverse side of a structure respectively.
7. The multiple-input multiple-output cavity output multiplexer of claim 1, wherein: the input coupling quantity and the output coupling quantity of a channel filter (112) with one end coupled with the multi-branch waveguide (111) and one end connected with the combiner are equal.
8. The multiple-input multiple-output cavity output multiplexer of claim 7, wherein: the resonant cavities at two ports of the channel filter (112) are subjected to reverse detuning, the frequency of the resonant cavity at one end of the channel filter (112) is higher than the central frequency of the channel filter (112), and the frequency of the resonant cavity at the other end of the channel filter (112) is lower than the central frequency of the channel filter (112).
9. The mimo-mux of claim 8, wherein: the frequency of the resonant cavities at the two ends of the channel filter (112) is lower than or higher than the central frequency of the channel filter (112) by a variable value which is 30-70% of the bandwidth of the channel filter (112); the center frequency of each channel filter (112) is 3 GHz-50 GHz.
10. The method of any of claims 1-9, wherein: comprises that
S1, obtaining an input coupling matrix and an output coupling matrix of a channel filter by combining an input coupling quantity and an output coupling quantity of a coupling matrix of the channel filter with a filter synthesis method;
s2, calculating by combining an input coupling matrix and an output coupling matrix of the channel filter and a characteristic model solver to obtain the central frequency of the channel filter, and performing reverse detuning on resonant cavities at two ports of the channel filter according to the central frequency of the channel filter and the bandwidth of the pass filter to obtain the frequencies of resonant cavities at the two ports of the channel filter;
s3, obtaining an inter-cavity coupling window between resonant cavities of the channel filter in an eigenmode solving mode, establishing a model of two cavities with the inter-cavity coupling window in simulation software HFSS, and calculating the coupling quantity between the two cavities through a characteristic mode solver, wherein the coupling quantity between the two cavities is equal to the coupling quantityThe product of the sum coefficient and the design bandwidth, i.e.: coup = M ij ×B w ，M ij Coupling coefficients of the ith row and the jth column of a coupling matrix of the channel filter; b is w Designing a bandwidth; coup is the coupling quantity between the two cavities;
calculating by using the corresponding coupling matrix to obtain an input/output coupling window of the channel filter, and adjusting the size of the coupling window to ensure that the simulated group delay is equal to the group delay calculated by the coupling matrix, so as to obtain the size of the input/output window coupling window of the filter;
and S4, performing overall simulation on the channel filter according to the calculation results of the steps S1 to S3, and designing a specific structure of the multiplexer according to the simulation result.
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