Amplitude-phase-adjustable microstrip line high-directional coupling structure and multichannel coupler

Abstract

The invention discloses an amplitude-phase-adjustable microstrip line high-directional coupling structure and a multichannel coupler. The amplitude-phase-adjustable microstrip line high-directional coupling structure comprises a dielectric plate, and an input port, a transmission port, a coupling port and an isolation port which are arranged on the dielectric plate, the input port is connected with the transmission port through the microstrip line, and the transmission port is used for being connected with the antenna port; the coupling port is connected with the isolation port through the two-stage coupling passband; the coupling port is used for outputting a coupling signal; the length of the coupling part of the two stages of coupling passbands can be adjusted; and a phase regulator for regulating the phase is arranged between the two stages of coupling passbands. The phase difference is formed through the distance between two stages of coupling, the amplitude and the phase are adjusted, coupling output is achieved at a coupling port, high isolation is achieved at an isolation port, and the problem that due to the fact that upper and lower media of a microstrip line high-directionality coupler are not uniform, the phase velocities of odd and even modes in the microstrip coupler are different, and the directionality of the microstrip line high-directionality coupler is poor is effectively solved. And the directivity is poor.

Description

Technical Field

[0001] The present application belongs to the technical field of power electronic components, and specifically relates to a microstrip line high-directional coupling structure with adjustable amplitude and phase and a multi-channel coupler. Background Art

[0002] Directional couplers are widely used in wireless communication systems for signal distribution, power monitoring, antenna feed networks, etc. In the field of test and measurement, directional couplers are used to extract signals from the transmission path to monitor power levels or analyze signals without affecting the performance of the entire system. In the military and aerospace fields, directional couplers are indispensable components in radar and satellite communication systems for signal routing and power control.

[0003] The design of directional couplers is based on transmission line theory. A transmission line is a structure that allows electromagnetic waves to propagate along it without much energy loss. When two transmission lines are placed in parallel, the electromagnetic fields on each line will couple with each other. This mutual coupling phenomenon can be controlled by specific design in order to divert a certain proportion of energy from one line to the other line.

[0004] Directional couplers usually consist of two mutually coupled transmission lines, which may be coaxial lines, microstrip lines, strip lines or waveguides. In the coupling region, the electromagnetic fields of the two lines interact, resulting in energy coupling from one line to the other. The design of the directional coupler determines the strength of the coupling, which is usually achieved by changing physical parameters such as the distance, length and medium between the lines.

[0005] In practical applications, directional couplers must meet several important design parameters: Bandwidth: The frequency range over which a coupler can operate effectively.

[0006] Coupling coefficient: It represents the ratio of energy diversion from one line to another.

[0007] Through loss: The loss value of the signal during the transmission process.

[0008] Isolation: Usually refers to the attenuation between the output port and the isolation port.

[0009] Impedance matching: Ensure that the impedance of the coupler matches that of the rest of the system to avoid signal reflections.

[0010] Phase characteristics: Ensure that the phase relationship is maintained in a multi-port coupler to ensure system performance.

[0011] Traditional directional couplers use stripline structures. Stripline directional couplers are three-layer structures, with a dielectric layer in the middle, ground layers on both sides, and conductive strips in the middle dielectric layer for signal transmission. This type of directional coupler has the same uniform dielectric on the top and bottom, and has good directivity. However, since the transmission line is buried in the dielectric layer, the amplitude and phase of the strip coupler cannot be adjusted. When multiple coupler channels are combined into one channel, the amplitude and phase of each channel cannot be kept consistent. Moreover, compared with microstrip lines, the processing cost of strip lines is higher. Microstrip directional couplers are used. Microstrip directional couplers use two or more adjacent conductive paths on the same substrate to achieve coupling. Since the bottom of the microstrip line is a dielectric plate and the top of the microstrip line is air, the uneven dielectrics on the top and bottom of the coupler cause differences in the phase velocities of the odd and even modes, resulting in poor directivity of the microstrip directional coupler. Summary of the invention

[0012] The present application aims to solve the technical problems that the parameters such as amplitude and phase of the current strip coupler cannot be adjusted, the processing cost of microstrip couplers and stripline couplers is high, and the directivity of microstrip directional couplers deteriorates. A microstrip line high directional coupling structure and a multi-channel coupler with adjustable amplitude and phase are provided.

[0013] In order to achieve the above objectives, this application adopts the following technical solutions: In the first aspect, the present application provides a microstrip line high-directional coupling structure with adjustable amplitude and phase, comprising a dielectric plate, and an input port, a transmission port, a coupling port and an isolation port arranged on the dielectric plate; the input port is connected to the transmission port through a microstrip line, and the transmission port is used to connect the antenna port; the coupling port is connected to the isolation port through a first-stage coupling passband and a second-stage coupling passband; the coupling port is used to output a coupled signal, and the isolation port is grounded; the length of the coupling point between the first-stage coupling passband and the second-stage coupling passband can be adjusted for adjusting the amplitude; a phase adjuster for adjusting the phase is provided between the first-stage coupling passband and the second-stage coupling passband.

[0014] Furthermore, in the present application, a length-adjustable adjustment branch is provided at the coupling point between the first-stage coupling passband and the second-stage coupling passband for adjusting the amplitude.

[0015] Furthermore, an impedance transformer for impedance matching is provided on the microstrip line between the input port and the transmission port of the present application; The input port of this application is an SMP connector, the transmission port uses an SMP-KK interface, and the isolation port is a ground pad.

[0016] Furthermore, the second-stage coupling passband of the present application is connected to the ground pad and grounded through a grounding resistor Rg; the right-angle bend at the coupling point between the first-stage coupling passband and the second-stage coupling passband has a cut angle to make the impedance at the bend continuous.

[0017] Furthermore, the medium plate of the present application is provided with fixing holes for fixing the medium plate.

[0018] Furthermore, the medium plate of the present application is provided with fixing holes for cooperating with bolts to fix the medium plate.

[0019] In a second aspect, the present application provides a multi-channel coupler, comprising a dielectric plate, and a plurality of microstrip line high directional coupling structures and a plurality of power dividers arranged on the dielectric plate; the dielectric plate is installed in a metal cavity and encapsulated by a metal shielding cover; Each of the microstrip line high directional coupling structures constitutes a channel, and the coupling ports of adjacent channels output coupling signals to the two input ends on one side of the corresponding power divider. The output ends of multiple power dividers output the coupling signals of multiple channels to the input end of the last power divider, and the output end of the last power divider is the combined output of the multiple coupling signals.

[0020] Furthermore, an isolation resistor Ri is provided at the input end of each power divider, and a coupling port of each channel is connected to the isolation resistor Ri of the corresponding power divider through a microstrip line.

[0021] Furthermore, the metal cavity of the present application is provided with a plurality of cavity output ports and a plurality of cavity input ports on the inner side of the cavity, wherein one cavity output port and one cavity input port form a group and correspond to the position of the corresponding signal channel on the dielectric plate; each cavity input port of the metal cavity corresponds to the position of the input port of the corresponding microstrip line high directional coupling structure, and each cavity output port corresponds to the position of the transmission port of the corresponding microstrip line high directional coupling structure; a probe and a connector are also provided on the metal cavity, and the position of the probe is connected to the combining port of the power divider at the end of the multi-channel coupler; the connector is provided on the outer side of the metal cavity and is electrically connected to the probe; The interior of the metal shielding cover is provided with a plurality of channel isolation walls and a plurality of transmission signal isolation walls. The plurality of channel isolation walls are respectively arranged between adjacent channels for shielding the signals between the channels; the plurality of transmission signal isolation walls are arranged on the outside of the microstrip line for connecting the coupling ports of each channel with the power divider for shielding the transmitted signal and preventing crosstalk between the signals of each channel.

[0022] Furthermore, the power distributor of the present application is a one-to-two power distributor, and the channel isolation wall and the transmission signal isolation wall are both metal isolation walls.

[0023] Compared with the prior art, this application has the following beneficial effects: The present application proposes a microstrip line high directional coupling structure with adjustable amplitude and phase. On the basis of the traditional microstrip line high directional coupler, a coupling copper strip is added, and two-stage coupling is adopted. The phase difference is formed by the spacing between the first-stage coupling and the second-stage coupling, and the amplitude and phase are adjusted so that it is coupled and output at the coupling port, and has a high degree of isolation at the isolation port, which effectively solves the problem of poor directivity caused by the difference in the odd and even mode phase velocities in the microstrip coupler due to the uneven upper and lower media of the microstrip line high directional coupler. At the same time, the microstrip line structure is adopted to reduce the production cost.

[0024] The present application also proposes a multi-channel coupler, which adopts a plurality of microstrip line high directional coupling structures with adjustable amplitude and phase. Each channel of the microstrip linear coupler is adjusted in amplitude and phase through two-stage coupling, and the amplitude and phase inconsistency after processing is adjusted. At the same time, multiple coupling channels are connected through multiple power dividers, and the coupling degree and phase difference of the microstrip line high directional coupler can be adjusted by adjusting the coupling spacing between the two-stage coupler and the straight-through channel in each channel and adjusting the distance between the two-stage couplers, thereby achieving the amplitude consistency and phase consistency of the four-channel high directional coupler.

[0025] Furthermore, each channel of the multi-channel coupler of the present application is isolated by an isolation wall, thereby effectively preventing signal crosstalk between the channels; within the passband 9.2GHz-9.6GHz frequency band, the directivity of each channel is above 20dB.

[0026] Furthermore, the multi-channel coupler of the present application uses multiple one-to-two power dividers to combine the signals of multiple coupling channels into one signal output, so that the high directional coupling structure of each channel maintains a consistent phase and amplitude. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 This is the structural diagram of the microstrip qualitative coupler for this application.

[0029] Figure 2 This is the PCB structure diagram of the four-channel microstrip line high directional coupler for this application.

[0030] Figure 3This is a structural schematic diagram of a metal cavity and a metal shielding cover of a four-channel microstrip line high directional coupler of the present application.

[0031] Figure 4 This is a schematic diagram of the front structure of the metal cavity of the four-channel microstrip line high directional coupler of this application.

[0032] Figure 5 This is a schematic diagram of the back structure of the metal cavity of the four-channel microstrip line high directional coupler of this application.

[0033] Figure 6 This is the return loss diagram of the combining port of the power divider for this application.

[0034] Figure 7 This is the insertion loss diagram of the four-way channel of the microstrip line high directional coupler for this application.

[0035] Figure 8 This is a test diagram of the directivity of four channels of the microstrip line high directional coupler of this application.

[0036] Fig. 9 This is a test diagram of the amplitude consistency of the four-way channels of the microstrip line high directional coupler in this application.

[0037] Fig.10 This is a test diagram of the phase consistency of four channels of the microstrip line high directional coupler in this application.

[0038] Among them, A-input port; B-transmission port; C-coupling port; D-isolation port; CH1-1 channel; CH2-2 channel; CH3-3 channel; CH4-4 channel; 1-dielectric plate; 2-microstrip line; 3-first-stage coupling passband; 4-second-stage coupling passband; 5-phase adjuster; 6-impedance transformer; 7-fixing hole; 8-adjustment branch; 9-SMP connector; 10-ground pad; 11-power divider; 12-channel isolation wall; 13-transmission signal isolation wall; 14-cavity output port; 15-cavity input port; 16-probe; 17-connector. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0040] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0041] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0042] In the description of the embodiments of the present application, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the invented product is usually placed when used. It is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0043] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", which does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0044] In the description of the embodiments of the present application, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0045] The present application proposes a microstrip line high directional coupling structure and a multi-channel coupler with adjustable amplitude and phase, which are described in detail below in conjunction with embodiments and drawings.

[0046] like Figure 1As shown, it is a schematic diagram of a microstrip line high directional coupling structure with adjustable amplitude and phase in the present application, which may include an input port A, a transmission port B, a coupling port C and an isolation port D; the input port A is connected to the transmission port B through a microstrip line, the coupling port C is connected to the first-stage coupling passband 3, and the isolation port D is connected to the second-stage coupling passband 4; the first-stage coupling passband 3 and the second-stage coupling passband 4 are both provided with an adjustable length adjustment branch 8 for adjusting the amplitude; the first-stage coupling passband 3 and the second-stage coupling passband 4 are connected with a phase adjuster 5 for adjusting the phase.

[0047] In practical applications, an impedance transformer 6 is provided on the microstrip line connecting the input port A and the transmission port B for impedance matching. The input port A is an SMP connector 9, specifically an SMP interface pad. The transmission port B uses an SMP-KK interface for connecting the antenna port. The coupling port C is connected to the power divider. The isolation port D is a ground pad 10, and the second-stage coupling passband 4 is connected to the ground pad 10 through a ground resistor Rg and grounded. The resistance value of the ground resistor Rg is 50 ohms.

[0048] It should be noted that the right-angle bend at the coupling point of the first-stage coupling passband 3 and the second-stage coupling passband 4 of the present application is cut to make the impedance at the bend continuous. The dielectric plate 1 of the microstrip line high-directional coupling structure with adjustable amplitude and phase of the present application is also provided with a fixing hole 7, and the fixing hole 7 is a threaded hole for fixing the dielectric plate 1 with a bolt.

[0049] Principles of this application: In order to solve the problems of poor isolation and unadjustable amplitude and phase of microstrip line high-directional couplers, this application will add a coupling structure to the traditional high-directional coupler; retain a half-wavelength distance difference between the two-stage coupling structure to increase the isolation at the isolation port; specifically, after the signal enters the input port A, a certain proportion will be coupled to the coupling port C, while the signal at the transmission port B is the most, and there is no signal or it is very weak at the isolation port D, thus achieving unidirectional coupling of the signal. This application can achieve amplitude and phase adjustment by adjusting the spacing between the two-stage coupling passbands and the length between the two-stage coupling passbands. Specifically: When a signal is input at input port A through two-stage coupled passbands, the energy passing through the first-stage coupled passband and the energy passing through the second-stage coupled passband are synthesized at isolation port D; the distance between the two-stage coupled passbands is half a wavelength, and after the energy at coupling port C is synthesized, the energy amplitudes of the two are the same and the phases are opposite; there is no energy output at isolation port D.

[0050] like Figure 2As shown, it is a schematic diagram of the PCB structure of a multi-channel coupler of the present application. The present embodiment is specifically a four-channel coupler, which may include four microstrip line high directional coupling structures with adjustable amplitude and phase, and each microstrip line high directional coupling structure with adjustable amplitude and phase is a channel. Among them, the coupling port C of channel 1 and the coupling port C of channel 2 are respectively connected to the two input ends on one side of the first power divider 11, the coupling port C of channel 3 and the coupling port C of channel 4 are respectively connected to the two input ends on one side of the second power divider 11, the output ends of the first power divider 11 and the second power divider 11 are respectively connected to the two input ends on one side of the third power divider 11, and the output end of the third power divider 11 is the combined output of the four-way coupled signal, and the coupled ports after the combined signal are connected using SSMA connectors.

[0051] In practical applications, the length of the adjustment branch 8 of each channel can realize the adjustment of the amplitude of each channel, so that the amplitude consistency of each channel is maintained; through the distance between the two-stage coupling passbands in each channel, the phase difference of each channel can be adjusted by increasing and decreasing the distance difference or cutting at the semicircle of the phase adjuster 5, so that the phase consistency of each channel is maintained.

[0052] It should be noted that the input ends of the three power dividers are all provided with isolation resistors Ri, and the coupling ports C of each channel are connected to the isolation resistors Ri of the corresponding power dividers through microstrip lines. The resistance of the isolation resistors Ri is 100 ohms. The three power dividers are all one-to-two power dividers.

[0053] In this embodiment, multiple microstrip line high directional coupling structures with adjustable amplitude and phase are installed in a metal cavity and encapsulated by a metal shielding cover, so that the coupler is completely isolated from the outside world to avoid the influence of the external electromagnetic environment on the coupler. A plurality of isolation walls are arranged on the inner side of the metal shielding cover to shield the signals of multiple channels and prevent crosstalk between the signals of each channel.

[0054] It should be noted that this embodiment is a four-channel coupler, and three channel isolation walls and four transmission signal isolation walls are arranged inside the metal shielding cover, and the channel isolation walls and the transmission signal isolation walls are all metal isolation walls. The three isolation walls are respectively arranged between channel 1 and channel 2, between channel 2 and channel 3, and between channel 3 and channel 4, and are used to shield the signals between the channels. The four transmission signal isolation walls are respectively arranged on the outside of the microstrip line used to connect the coupling port C of each channel and the power divider 11, and are used to shield the transmitted signal to prevent crosstalk between the signals of each channel.

[0055] In practical applications, a plurality of cavity output ports 14 and a plurality of cavity input ports 15 are arranged inside the metal cavity, wherein one cavity output port 14 and one cavity input port 15 form a group and correspond to the positions of the corresponding signal channels on the dielectric plate. Figure 4 and Figure 5 As shown, Figure 4 and Figure 5 This is a schematic diagram of the structure of a metal cavity according to an embodiment of the present application, wherein: Figure 4 It is the front of the metal cavity. Figure 5 The back of the metal cavity. This embodiment is a four-channel coupler, and the metal cavity is provided with four cavity output ports 14 and four cavity input ports 15, which correspond to the positions of channel 1 CH1, channel 2 CH2, channel 3 CH3 and channel 4 CH4 respectively; wherein each cavity input port 15 of the metal cavity corresponds to the position of the input port A of the corresponding microstrip line high directional coupling structure, and each cavity output port 14 corresponds to the position of the transmission port B of the corresponding microstrip line high directional coupling structure; the metal cavity is also provided with a probe 16 and a connector 17, and the position of the probe 16 is connected to the combining port of the power divider 11 at the end of the multi-channel coupler; the connector 17 is provided on the outside of the metal cavity and is electrically connected to the probe 16.

[0056] In practical applications, the four-channel coupler of the embodiment of the present application is simulated by using the Ansys standard three-dimensional electromagnetic simulation tool, such as Figure 1 It is a schematic diagram of the return loss of the combined port of the power divider 11 after the four-way coupling channels are combined. In the entire frequency band, the return loss in the 9.2GHz-9.6GHz frequency band is less than -20dB; like Fig. 9 The figure shows the coupling degree of channel 1, channel 2, channel 3 and channel 4 coupled to the combining port of the power divider 11. The coupling degree of each channel is 25dB, and there is a 6dB attenuation after passing through the one-to-four power divider to the combining port. Adding the line loss, the coupling port to the power divider is 31.5dB after combining; the coupler amplitude and phase are not adjusted, the four-channel coupler is placed in a metal cavity, and due to the coupling crosstalk between the unbalanced structure in the metal cavity and the signal network, the amplitude and phase of the four-channel coupler after passing through the power divider to the combining port are different; when the isolation wall is not added, there is coupling between the coupled signals of channel 2 and channel 3 and the two signals of the power divider 11, resulting in a large difference between the coupled signals of channel 2 and channel 3 and the signals of channel 1 and channel 4 after reaching the power divider 11.

[0057] The optimized four-channel microstrip line high directional coupler is as follows Figure 7 As shown, the loss of each channel is 0.15dB; Figure 8As shown, the directivity of each coupling channel is above 20dB; Fig. 9 As shown in the figure, the amplitude difference of each channel after being combined by the power divider is within 0.3dB; Fig.10 As shown, the phase difference of each channel after being combined by the power divider is within 3°; The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A microstrip line high directional coupling structure with adjustable amplitude and phase, characterized in that: The invention comprises a dielectric plate (1), and an input port (A), a transmission port (B), a coupling port (C) and an isolation port (D) arranged on the dielectric plate (1); the input port (A) is connected to the transmission port (B) via a microstrip line (2), and the transmission port (B) is used to connect to an antenna port; the coupling port (C) is connected to the isolation port (D) via a first-stage coupling passband (3) and a second-stage coupling passband (4); the coupling port (C) is used to output a coupling signal, and the isolation port (D) is grounded; the length of the coupling point between the first-stage coupling passband (3) and the second-stage coupling passband (4) can be adjusted for adjusting the amplitude; and a phase adjuster (5) for adjusting the phase is arranged between the first-stage coupling passband (3) and the second-stage coupling passband (4).

2. The microstrip line highly directional coupling structure with adjustable amplitude and phase according to claim 1, characterized in that: An adjustment branch (8) with adjustable length is provided at the coupling point between the first-stage coupling passband (3) and the second-stage coupling passband (4) for adjusting the amplitude.

3. The microstrip line highly directional coupling structure with adjustable amplitude and phase according to claim 1, characterized in that: An impedance transformer (6) for impedance matching is provided on the microstrip line between the input port (A) and the transmission port (B); The input port (A) is an SMP connector (9), the transmission port (B) adopts an SMP-KK interface, and the isolation port (D) is a ground pad (10).

4. The microstrip line highly directional coupling structure with adjustable amplitude and phase according to claim 3, characterized in that: The second-stage coupling passband (4) is connected to the ground pad (10) via a grounding resistor Rg and is grounded; a right-angle bend at the coupling point between the first-stage coupling passband (3) and the second-stage coupling passband (4) has a cut angle for making the impedance at the bend continuous.

5. The microstrip line highly directional coupling structure with adjustable amplitude and phase according to claim 1, characterized in that: The medium plate (1) is provided with a fixing hole (7) for fixing the medium plate (1).

6. The microstrip line highly directional coupling structure with adjustable amplitude and phase according to claim 1, characterized in that: The medium plate is provided with fixing holes for cooperating with bolts to fix the medium plate.

7. A multi-channel coupler using the microstrip line high directional coupling structure according to any one of claims 1 to 7, characterized in that: It comprises a dielectric plate, and a plurality of microstrip line high directional coupling structures and a plurality of power dividers (11) arranged on the dielectric plate; the dielectric plate is installed in a metal cavity and encapsulated by a metal shielding cover; Each of the microstrip line high directional coupling structures forms a channel, and the coupling ports (C) of adjacent channels output coupling signals to two input ends on one side of the corresponding power divider (11), and the output ends of the multiple power dividers output the coupling signals of multiple channels to the input end of the last power divider, and the output end of the last power divider is the combined output of the multiple coupling signals.

8. The multi-channel coupler according to claim 7, characterized in that: The input end of each power divider (11) is provided with an isolation resistor Ri, and the coupling port (C) of each channel is connected to the isolation resistor Ri of the corresponding power divider through a microstrip line.

9. The multi-channel coupler according to claim 7, characterized in that: A plurality of cavity output ports (14) and a plurality of cavity input ports (15) are arranged on the inner side of the metal cavity, wherein one cavity output port (14) and one cavity input port (15) form a group and correspond to the positions of corresponding signal channels on the dielectric plate; Each cavity input port (15) of the metal cavity corresponds to the position of the input port (A) of the corresponding microstrip line high directional coupling structure, and each cavity output port (14) corresponds to the position of the transmission port (B) of the corresponding microstrip line high directional coupling structure; a probe (16) and a connector (17) are also provided on the metal cavity, and the position of the probe (16) is connected to the combining port of the power divider (11) at the end of the multi-channel coupler; the connector (17) is provided on the outside of the metal cavity and is electrically connected to the probe (16); A plurality of channel isolation walls (12) and a plurality of transmission signal isolation walls (13) are arranged inside the metal shielding cover. The plurality of channel isolation walls (12) are arranged between adjacent channels respectively, and are used to shield the signals between the channels. The plurality of transmission signal isolation walls (13) are arranged outside a microstrip line used to connect each channel coupling port (C) with a power divider (11), and are used to shield the transmitted signal and prevent crosstalk between the signals of each channel.

10. The multi-channel coupler according to any one of claims 7 to 9, characterized in that: The power distributor is a one-to-two power distributor, and the channel isolation wall and the transmission signal isolation wall are both metal isolation walls.

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