CN115313004B - Multiple-input multiple-output cavity output multiplexer and design method - Google Patents
Multiple-input multiple-output cavity output multiplexer and design method Download PDFInfo
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/207—Hollow waveguide filters
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P11/00—Apparatus or processes specially adapted for manufacturing waveguides or resonators, lines, or other devices of the waveguide type
- H01P11/007—Manufacturing frequency-selective devices
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The utility model provides a multiple-input multiple-output cavity output multiplexer, through structurally with a plurality of multiplexer cavitys with the structure integrated design that closes way, accurate calculation multiplexer and the structure size that closes way, rationally set up the coupling matrix of channel filter, optimize the phase place of multiplexer and the structure that closes way, realize the design of the electric property of multiple-input multiple-output cavity output multiplexer. The problems of using an isolator, secondarily cascading a multiplexer and the like in the traditional design are avoided, so that the electric characteristics are effectively improved, the overall volume and quality of products are reduced, the system design is greatly simplified, the power amplifier can be flexibly used among different channels, the output combination is flexible, and the like are solved, and the problem of flexible application of the 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 thereof, belonging to the fields of microwave filters and multiplexers.
Background
The output multiplexer is an important component of satellite payload transponder systems, and is typically used to implement the combined function of high power channels, the performance of which directly affects the communication quality of the transponder channels. With the rapid development of satellite industry, the development of broadband communication satellites (HTS satellites) is promoted, and compared with the traditional fixed service communication satellites (FSS satellites), the satellite has the advantages of multi-point beam coverage, frequency multiplexing, high gain, excellent anti-interference performance and the like. The mimo multiplexer is a key component of the payload and has the main functions of splitting, filtering and combining the rf channels.
To accommodate the development needs of HTS satellites, mimo multiplexers began to walk into the line of sight of people, which can arbitrarily combine and output multiple narrowband signals from different demultiplexers (DeMUX). The backward output multiplexer generally comprises an input port and a plurality of output ports, and the output port of the multiplexer needing to be combined is connected with other output ports needing to be combined through an isolator to realize the combination. The traditional design can not realize the branching-filtering-combining of multiple input ports, and has complex overall structure and larger volume and weight.
Disclosure of Invention
The application solves the technical problems that: the utility model provides a multi-input multi-output cavity output multiplexer, aims at the high-power broadband communication system in space, realizes multichannel broadband signal's branching, filtering resynthesis and is the main function. The multi-input multi-output multiplexer provided by the application for integrated design can remove the isolator by means of circuit synthesis, structural arrangement, simulation optimization and the like on the premise of not reducing the design efficiency and the design precision, and only needs to design the channel filter once, thereby effectively reducing the whole volume, the quality and the 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 difficult problem of flexible application of the channel by the broadband communication satellite is solved.
The application adopts the following technical scheme:
a multiple-input multiple-output cavity output multiplexer, comprising: the multiplexer comprises at least two multiplexer cavities, wherein each 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 together, the channel filters of the different multiplexer cavities needing to be combined 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 signals are respectively input into the multiplexer cavity from the input ports of the multiplexer cavity, the filters are split by the multiple channel filters through the multi-branch waveguide, the split narrowband signals are subjected to frequency synthesis according to application requirements, the multiple-input multiple-output cavity output multiplexer realizes the splitting, filtering and combining functions of the signals, and the multiple-input multiple-output cavity output multiplexer comprises multiple input ports, multiple output ports and multiple channel filters.
The multiplexer cavity is internally provided with a plurality of channel filters for filtering signals, and the channel filters divide the signals according to wave beam frequencies and can divide a broadband signal into a plurality of narrowband signals according to frequencies.
The input signals of different multiplexer cavities are independent broadband signals, and the input signal frequencies are overlapped or different. When the signals enter the multiplexer cavity from the input port, the signals are shunted into the channel filter through the multi-branch waveguide to be filtered, part of the signals are directly output from the output port, and part of the signals are combined with other frequency signals through the combiner and then output from the output port.
The number of the multiplexer cavities is 2-5, the broadband signals input from the input port of each channel filter are 2-5 paths, and the signals output from the output port are 2-16 paths.
The number of channel filters contained in each multiplexer cavity is 2-10; each combiner is communicated with 2-4 paths of channel filters, namely the combiners are used for combining narrowband signals of the 2-4 paths of channel filters.
The channel filters are square resonant cavities or round resonant cavities with chamfers, the number of the resonant cavities of each channel filter is 3-5, and coupling windows are formed among the resonant cavities. The resonant cavities are arranged on the same plane in a horizontal direction, a vertical direction or an oblique direction.
The channel filter is formed by cascading a plurality of resonators, and the resonators in the application adopt a cavity structure form, so the resonator is called a resonant cavity.
And a compensation column is designed in the multi-branch waveguide, and the side wall of the multi-branch waveguide is opposite to the resonant cavity of the channel filter.
Two multiplexer cavities which are in parallel are formed by processing 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 the form of waveguides, standard waveguides or height-reduced waveguides are selected, and the MIMO cavity output multiplexer is installed vertically or horizontally.
The resonator of the channel filter is selected from a waveguide filter, a dielectric filter or a coaxial filter.
The input coupling amount and the output coupling amount of the channel filter of which one end is coupled with the multi-branch waveguide and the other end is connected with the joint router 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 center frequency of the channel filter, and the frequency of the resonant cavity at the other end of the channel filter is lower than the center frequency of the channel filter.
Generally, the frequency of the resonant cavities at the two ends of the channel filter is lower or higher than the center frequency of the channel filter by a variable value which 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 of 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 a filter synthesis method, wherein the input coupling amount of the coupling matrix of the channel filter is equal to the output coupling amount;
s2, combining input and output coupling matrixes of the channel filter, calculating through a characteristic mode solver to obtain the center frequency of the channel filter, and performing reverse detuning on resonant cavities of two ports of the channel filter according to the center frequency of the channel filter to obtain the frequencies of the resonant cavities of 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 with two cavities of the inter-cavity coupling window in commercial simulation software HFSS, and calculating the coupling quantity between the two cavities through a eigenmode solver, wherein the coupling quantity between the two cavities is equal to the product of a coupling coefficient and a design bandwidth, namely: coupling=m ij ×B w Wherein M is ij To correspond to the coupling coefficient, a specific M ij Coupling coefficients of the ith row and the jth column of the coupling matrix of the channel filter; b (B) w To design bandwidth; coupling is the coupling quantity between two cavities;
obtaining an input-output coupling window of the channel filter by utilizing the calculation of the corresponding coupling matrix, 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, carrying out overall simulation on the channel filter according to the calculation results of the steps S1-S3, and designing a specific structure of the multiplexer according to the simulation results.
In summary, the application at least comprises the following beneficial technical effects:
(1) The multiple functions of branching, filtering, combining and the like are integrated through the design technology of the MIMO multiplexer, and compared with the prior art, an isolator and a filtering unit used in combining are omitted.
(2) The power amplifier is flexibly used by the system through the design technology of the multiple-input multiple-output multiplexer, the requirement of flexible output combination is met, the application state of the repeater system can be adjusted 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, smaller in size and lighter in weight.
(4) The electrical performance is improved and the insertion loss of the channel is reduced by the design technology of the MIMO multiplexer.
(5) The application has flexible design, solves the integrated design of the system under the high-power condition, meets the system requirements under various frequency plans, can meet the increasingly-used requirements of the communication system at the present stage, achieves the international level of the design and has strong competitiveness;
(6) Compared with the traditional output multiplexer for realizing the same function, the product has the advantages of novel structure, smaller size, lighter weight, higher reliability, smaller loss, flexible output combination and the like, and different channels can flexibly use the power amplifier.
Drawings
Fig. 1 is an exploded view of a mimo cavity output multiplexer according to an embodiment of the present application.
Fig. 2 is a block diagram of a mimo cavity output multiplexer according to an embodiment of the present application.
FIG. 3 is a block diagram of a multiplexer-cavity in accordance with an embodiment of the present application.
Fig. 4 is a block diagram of a multiplexer two-chamber in an embodiment of the application.
Fig. 5 is a block diagram of a three-cavity multiplexer in an embodiment of the application.
Fig. 6 is a block diagram of a multiplexer cover plate in an embodiment of the application.
Fig. 7 is a block diagram of a second combiner in an embodiment of the present application.
Reference numerals illustrate:
11. a multiplexer-cavity; 111. a multi-branched 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 two-chamber; 121. a sixth channel; 122. a seventh channel; 123. an eighth channel; 124. a ninth channel;
13. a multiplexer three-cavity; 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. an input port.
Detailed Description
The application is described in further detail below with reference to the attached drawings and to specific embodiments:
the embodiment of the application discloses a multi-input multi-output cavity output multiplexer, which comprises at least two multiplexer cavities as shown in fig. 1 and 2, 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 sides of the channel filters 112 of different multiplexer cavities are close together, the channel filters 112 of different multiplexer cavities needing to be combined are opposite, and the output ports of the opposite channel filters 112 needing to be combined are connected with the same combiner. The multiplexer cavity and the combining structure are integrated, so that the functions of branching, filtering and resynthesis of the multipath broadband signals of the multiplexer are realized, and the structure is simple.
As shown in fig. 1 and 2, two multiplexer cavities in juxtaposition may be located on the front and back sides of a structure, respectively; the method can also be as follows: two multiplexer cavities that are mutually juxtaposed are respectively located one side of a structure, and one side of two structure is mutually juxtaposed. The combiner can be integrally arranged with a structural member forming a multiplexer cavity, and the combiner is internally provided with a combiner cavity 223 communicated with different channel filters 112; the method can also be as follows: the combiner comprises a combiner shell 221 and a combiner cover plate 222, the combiner shell 221 is mechanically connected with a structural member provided with a multiplexer cavity, the combiner cover plate 222 covers an 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 structure.
Multiple channel filters 112 and multiple-branch waveguides may be machined, with the channel filters 112 being conventional waveguide filters. The channel filter 112 includes a plurality of resonant cavities, which are square resonant cavities or circular resonant cavities with chamfers, and coupling windows are generated between the resonant cavities. The multiplexer cavity is formed after the cover plate is connected with the cavity. The cover plate is provided with a tuning screw, the tuning screw is used for debugging the frequency and coupling of the channel filter 112, and the electric performance requirement of the product can be met through debugging. The phase gasket 6 is arranged between the multiplexer cavity and the combiner, and the error caused by processing and simulation can be finely adjusted by changing the thickness of the phase gasket 6, so that good standing wave characteristics are obtained. The multi-branch waveguide 111 is internally provided with a compensation column 5, and the compensation column 5 is positioned on the side wall of the multi-branch waveguide 111, which is opposite to the resonant cavity of the channel filter 112.
The circuit characteristics of the channel filter 112 for the mimo cavity output multiplexer are characterized. Common filter circuit characteristics are often described mathematically using a coupling matrix. Generally, the coupling matrix of the filter is formed by combining two terminals, so that better standing-wave ratio characteristics can be obtained; the channel filter 112 coupling matrix for the adjacency output multiplexer is integrated as a single terminal. For the mimo cavity output multiplexer, the coupling matrix of the channel filter 112, whose one end is coupled to the multi-branch waveguide 111 and one end is connected to the junction router, has its own characteristics, and the coupling amounts in the coupling matrix tend to be the same for input and output. The resonant cavities at the two ports of the channel filter 112 are reverse detuned, and the frequency of the resonant cavity at one end of the channel filter 112 is higher than the center 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 center frequency of the channel filter 112. The frequency of the resonant cavities at the two 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 integrated with the structure between the multiplexer cavities.
In this embodiment, the multiplexer includes 3 multiplexer cavities and 2 combiners, which are a multiplexer first cavity 11, a multiplexer second cavity 12, a multiplexer third cavity 13, a first combiner 21, and a second combiner 22.
Specifically, as shown in fig. 1 and 6, the multiplexer includes a first structural member 31, a second structural member 32, a first cover 41, a second cover 42, a third cover 43, a first combiner 21, and a second combiner 22. The front surface of the first structural member 31 is provided with a first multi-branch waveguide 111 and a plurality of channel filters 112 coupled with the first multi-branch waveguide 111, the back surface of the first structural member 31 is provided with a second multi-branch waveguide 111 and a plurality of channel filters 112 coupled with the second multi-branch waveguide 111, and a first cover plate 41 and a second cover plate 42 are respectively covered 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 the second structural member 32, and a third cover plate 43 is disposed on a surface of the second structural member 32 where the multiplexer three-cavity 13 is disposed, so as to form the multiplexer three-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 point, a fourth-order chebyshev filter, and a third-order chebyshev filter according to requirements. The coupling matrix of the channel filters 112 is the same as that of a typical generalized chebyshev filter, the existing self-programming can obtain a filter coupling matrix meeting the index requirements through a comprehensive and optimization method, and each channel filter 112 has multiple coupling quantities such as input and output, main coupling, cross coupling and self-coupling, and the corresponding coupling quantity can be found in the coupling matrix. The coupling matrix of each channel is synthesized through self-programming, and the multiplexer circuit is modeled, simulated and optimized to obtain the multiplexer coupling matrix.
As shown in fig. 4, the multiplexer two-cavity 12 has 4 channel filters 112, namely, a sixth channel 121 to a ninth channel 124, and the sixth channel 121 to the ninth channel 124 are respectively a third-order generalized chebyshev filter with a zero point, a fourth-order chebyshev filter, and a fourth-order chebyshev filter according to requirements.
As shown in fig. 5, the multiplexer three-cavity 13 has 3 channel filters 112, and according to the requirements, the tenth channel 131 to the twelfth channel 133 of the 3 channel filters 112 are respectively a fourth-order generalized chebyshev filter with one zero point, and a third-order chebyshev filter.
As shown in fig. 7, the combiner housing 221 and the combiner cover 222 of the first combiner 21 are integrally connected with the first structural member 31, and the combiner cavity 223 of the first combiner 21 communicates with the second passage 1122 and the eighth passage 123; the combiner housing 221 of the second combiner 22 is connected with the first structural member 31 and the second structural member 32 through bolts, the combiner cover plate 222 of the second combiner 22 is covered on the opening position 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 frequencies of the input signals are overlapped or different, three paths of broadband signals are respectively input into the multiplexer cavities from the input ports 7 of the three multiplexer cavities, the signals are split by a plurality of channel filters 112 through a multi-branch waveguide 111, the channel filters 112 divide the broadband signals into a plurality of narrowband signals according to the frequencies, the split narrowband signals are combined through a combiner according to the application requirements, and the multi-input multi-output cavity output multiplexer realizes the splitting, filtering and combining functions of the signals. The mimo cavity output multiplexer of this 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 MIMO multiplexer channel filter adopts a coupling matrix suitable for the MIMO mode, which is different from the channel filter of the traditional multiplexer, and 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 by the center frequency of the channel filter, and calculating by a characteristic mode solver by combining a coupling matrix of the channel filter. And a resonant cavity model is built, and the resonant cavity resonates at a required frequency point by adjusting the diameter and the length (length and height) of the resonant cavity, so that the resonant cavity has a good Q value and a single-mode working bandwidth. Since a separate resonator is calculated here and in practice it is also necessary to window the coupling, which reduces the resonance frequency of the resonator, the resonance frequency should here be made slightly higher than the required frequency by 0.5%. And carrying out reverse detuning on the resonant cavities of the two ports of the channel filter according to the obtained center frequency and the bandwidth of the pass-guide filter.
And S3, the inter-cavity coupling window is obtained by an eigenmode solving mode, a model of two cavities is built in commercial simulation software HFSS, and the coupling quantity between the two cavities is calculated through a characteristic mode solver. The amount of coupling between the two cavities is equal to the difference between the solved modes, which should be equal to the product of the coupling coefficient and the design bandwidth, i.e.: coupling=m ij ×B w Wherein M is ij To correspond to the coupling coefficient, a specific M ij Coupling coefficients of the ith row and the jth column of the coupling matrix of the channel filter; b (B) w To design bandwidth; coupling is the corresponding actual amount of coupling. The input/output coupling window of the channel filter is calculated by using the corresponding coupling matrix, and the size of the coupling window is adjusted to make the simulated group delay equal to the group delay calculated by the coupling matrix, so as to obtain the size of the input/output window of the filter.
S4, after the steps S1-S3 are completed, carrying out overall simulation on the channel filter, repeatedly adjusting the sizes of the initial filter size and the window size obtained through the steps, and changing the sizes of the coupling window and the frequency screw by comparing the advantages and disadvantages of the electric characteristics, so that an excellent simulation result is finally achieved. Of course, other methods may be used to perform 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 an input port and an output port are arranged on the multiplexer cavity.
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 built in commercial simulation software HFSS. The combiner needs to be simulated in combination with the multiplexer in commercial software Mician, and the 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: through the integration of combiner and multiplexer structure, form the multiplexer that has a plurality of input ports and output port, broadband signal is respectively from the input port of different multiplexer cavitys in the input port input to the multiplexer cavity, through the multi-branch waveguide, carry out the wave filter branching by a plurality of channel filters, the channel filter divides into a plurality of narrowband signals according to the wave beam frequency, the narrowband signal after branching realizes frequency synthesis through the combiner according to the application requirement again, the branching of the signal of the multi-input multi-output cavity output multiplexer has been realized.
The above embodiments are not intended to limit the scope of the present application, so: all equivalent changes in structure, shape and principle of the application should be covered in the scope of protection of the application.
Claims (9)
1. The utility model provides a multiple-input multiple-output cavity output multiplexer which characterized in that: the multi-channel multi-branch filter comprises 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), and the multi-branch waveguide (111) is provided with an input port (7);
the sides of the channel filters (112) of different multiplexer cavities are abutted together, the channel filters (112) of the different multiplexer cavities needing to be combined are opposite, and the output ports of the opposite channel filters (112) needing to be combined are connected with the same combiner;
the channel filter (112) comprises a plurality of resonant cavities, wherein the resonant cavities are square resonant cavities or round resonant cavities with chamfers, and coupling windows are formed among the resonant cavities;
the number of the multiplexer cavities is 2-5, the number of signals output from the output port of each channel filter is 2-16, and the number of the channel filters contained in each multiplexer cavity is 2-10; each combiner is communicated with 2-4 paths of channel filters.
2. The mimo cavity output multiplexer of claim 1, wherein: 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: 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 multi-branch waveguide (111) opposite to the resonant cavity of the channel filter (112).
5. The mimo cavity output multiplexer of claim 1, wherein: the two multiplexer cavities which are in parallel are respectively positioned on the front surface and the back surface of a structural member.
6. The mimo cavity output multiplexer of claim 1, wherein: the input coupling amount and the output coupling amount of the channel filter (112) with one end coupled with the multi-branch waveguide (111) and one end connected with the junction router are equal.
7. The mimo output multiplexer of claim 6, wherein: the resonant cavities at two ports of the channel filter (112) are reversely detuned, the frequency of the resonant cavity at one end of the channel filter (112) is higher than the center 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 center frequency of the channel filter (112).
8. The mimo cavity output multiplexer of claim 7, 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), the variable value is 30-70% of the bandwidth of the channel filter (112); the center frequency of each channel filter (112) is 3 GHz-50 GHz.
9. A method for designing a mimo cavity output multiplexer according to any one of claims 1-8, wherein: comprising
S1, obtaining an input coupling matrix and an output coupling matrix of a channel filter by combining a filter synthesis method, wherein the input coupling amount of the coupling matrix of the channel filter is equal to the output coupling amount;
s2, combining an input coupling matrix and an output coupling matrix of the channel filter, calculating through a characteristic mode solver to obtain the center frequency of the channel filter, and performing reverse detuning on the resonant cavities of two ports of the channel filter according to the center frequency of the channel filter and the bandwidth of the channel filter to obtain the frequencies of the resonant cavities of the two ports of the channel filter;
s3, obtaining an inter-cavity coupling window between resonant cavities of the channel filter by an eigenmode solving mode, establishing a model with two cavities of the inter-cavity coupling window in simulation software HFSS, and calculating the coupling quantity between the two cavities by a eigenmode solver, wherein the coupling quantity between the two cavities is equal to the product of a coupling coefficient and a design bandwidth, namely: coupling=m ij ×B w ，M ij Coupling coefficients of the ith row and the jth column of the coupling matrix of the channel filter; b (B) w To design bandwidth; coupling is the coupling quantity between two cavities;
obtaining an input-output coupling window of the channel filter by utilizing the calculation of the corresponding coupling matrix, 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;
s4, carrying out overall simulation on the channel filter according to the calculation results of the steps S1-S3, and designing a specific structure of the multiplexer according to the simulation results;
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 an input port and an output port are arranged on the multiplexer cavity.
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