A multi-mode antenna for a non-contact high-speed connector

Abstract

The application provides a multi-mode antenna for a non-contact high-speed connector, which is characterized by a multi-mode feed network. 01 , TM 01 , and modes, the second circular waveguide transmits TM 01 , and modes, and the third circular waveguide transmits and modes; the mode converter structure comprises a first waveguide transmission structure and a second waveguide transmission structure, the first waveguide transmission structure is connected with the first circular waveguide, the second waveguide transmission structure is connected with the second circular waveguide, and the orthogonal mode converter structure is connected with the third circular waveguide.

Description

Technical Field

[0001] This invention relates to the field of wireless communication technology, and in particular to a multimode antenna for contactless high-speed connectors. Background Technology

[0002] Millimeter waves refer to electromagnetic waves with frequencies ranging from 30 GHz to 300 GHz, offering advantages such as large bandwidth and high data transmission rates. Traditional physical high-speed connectors suffer from wear and tear during repeated insertion and removal. Non-contact connections built using millimeter wave short-range communication, where the transmitter and receiver are wirelessly connected and physically separated, effectively avoid this wear. To achieve efficient non-contact connections, the antenna needs to support propagation in multiple orthogonal modes to enable parallel transmission of multiple data streams within the same frequency band.

[0003] A multimode antenna is an antenna design capable of supporting multiple modes of transmission. It features a common aperture characteristic, meaning that multiple orthogonal modes can be simultaneously excited and transmitted within the same physical aperture. This common aperture characteristic allows for a highly compact structure in multimode antennas, resulting in significant advantages in miniaturization and facilitating integration into high-density communication devices. By achieving multimode transmission within the same frequency band, multimode antennas can significantly improve spectral efficiency and communication capacity. This technology provides an efficient and flexible solution for contactless connectors, which is conducive to promoting the widespread application of millimeter-wave communication in areas such as smart device interaction, industrial automation, and high-density network deployment.

[0004] However, existing antennas are limited by their structure, often resulting in smaller communication capacity and lower data transmission efficiency. Summary of the Invention

[0005] In view of this, embodiments of the present invention provide a multimode antenna for a non-contact high-speed connector to eliminate or improve one or more defects present in the prior art.

[0006] One aspect of the present invention provides a multimode antenna for a contactless high-speed connector, the multimode antenna including a multimode feed network, the key component of which is the multimode feed network, the multimode feed network including a mode converter structure, an orthogonal mode converter structure, and a common circular waveguide structure; the common circular waveguide structure includes a first circular waveguide, a second circular waveguide, and a third circular waveguide with gradually decreasing diameters and connected in sequence, the first circular waveguide being capable of propagation In this mode, the second circular waveguide is capable of propagating The mode in which the third circular waveguide can propagate model;

[0007] The mode converter structure includes a first waveguide transmission structure and a second waveguide transmission structure. The first waveguide transmission structure is connected to a first circular waveguide, the second waveguide transmission structure is connected to a second circular waveguide, and the orthogonal mode converter structure is connected to a third circular waveguide.

[0008] In the specific implementation process, the multimode antenna also includes a horn antenna, and the horn antenna in this solution adopts the existing horn antenna structure.

[0009] By adopting the above scheme, the multimode antenna can support the transmission of multiple orthogonal modes within the same frequency band, significantly improving spectrum utilization and communication capacity. These four modes can propagate simultaneously in a common circular waveguide structure, demonstrating the common-aperture characteristic of the multimode antenna. This design not only makes the antenna structure compact but also significantly reduces its size, facilitating integration into high-density communication equipment and improving communication capacity and data transmission efficiency.

[0010] In some embodiments of the present invention, the diameter of the first circular waveguide is greater than 6.8 mm, the diameter of the second circular waveguide is in the range of 4.3 mm to 5.5 mm, and the diameter of the third circular waveguide is in the range of 3.14 mm to 3.45 mm.

[0011] In some embodiments of the present invention, the diameter of the first circular waveguide is 7.4 mm, the diameter of the second circular waveguide is 5.44 mm, and the diameter of the third circular waveguide is 3.36 mm.

[0012] In some embodiments of the present invention, one end of the first circular waveguide of the common circular waveguide structure is used to connect to a horn antenna and receive the millimeter wave transmitted by the horn antenna. One end of the first circular waveguide is used to connect to a circular surface of the second circular waveguide. One end of the second circular waveguide is used to connect to a circular surface of the third circular waveguide. The other circular surface of the third circular waveguide is used to connect to the quadrature mode converter structure.

[0013] In some embodiments of the present invention, the first waveguide transmission structure comprises a first transmission channel and a second transmission channel arranged symmetrically. One end of the first transmission channel and the second transmission channel are both connected to the arc surface of the first circular waveguide, and the other ends of the first transmission channel and the second transmission channel are connected together. A fourth port is connected at the connection end of the first transmission channel and the second transmission channel.

[0014] In some embodiments of the present invention, the first transmission channel includes a first main channel, a first sub-channel, and a second sub-channel. One end of each of the first and second sub-channels is connected to a first circular waveguide, and the other ends of the first and second sub-channels are connected to the first main channel. The second transmission channel includes a second main channel, a third sub-channel, and a fourth sub-channel. One end of each of the third and fourth sub-channels is connected to the first circular waveguide, and the other ends of the third and fourth sub-channels are connected to the second main channel.

[0015] In some embodiments of the present invention, the second waveguide transmission structure comprises a symmetrically arranged third transmission channel and a fourth transmission channel, one end of which is connected to the arcuate surface of the second circular waveguide, the other end of which is connected, and a third port is connected at the connection end of the third transmission channel and the fourth transmission channel.

[0016] In some embodiments of the present invention, the quadrature mode converter structure includes a first port and a second port. The first port is located at one end of a first port transmission channel, and the second port is located at one end of a second port transmission channel. The first port transmission channel and the second port transmission channel are perpendicular to each other. The first port is used to excite the TE. 11 x Mode, the second port is used to excite TE 11 y model.

[0017] In some embodiments of the present invention, the other end of the first port transmission channel is connected to the third circular waveguide of the common circular waveguide structure, and the other end of the second port transmission channel is connected to the first port transmission channel.

[0018] In some embodiments of the present invention, both the first port transmission channel and the second port transmission channel extend along a straight line, and one end of the first port transmission channel is connected to the circular surface of the third circular waveguide.

[0019] Additional advantages, objects, and features of the invention will be set forth in part in the description which follows, and will also become apparent in part to those skilled in the art upon studying the text, or may be learned by practice of the invention. The objects and other advantages of the invention will become apparent from the description and the accompanying drawings.

[0020] Those skilled in the art will understand that the objectives and advantages achievable with the present invention are not limited to those specifically described above, and that the above and other objectives achievable with the present invention will become clearer from the following detailed description. Attached Figure Description

[0021] The accompanying drawings, which are provided to further illustrate the invention and form part of this application, are not intended to limit the scope of the invention.

[0022] Figure 1 This is a perspective view of the multimode antenna used in this solution for a non-contact high-speed connector.

[0023] Figure 2 This is a perspective view of the multimode antenna used in this solution for a non-contact high-speed connector from another angle.

[0024] Figure 3 This is a perspective view of the common circular waveguide structure in this scheme.

[0025] Figure 4 This is a perspective structural diagram of the orthogonal mode converter structure of this scheme;

[0026] Figure 5 This is a perspective view of the orthogonal mode converter structure of this scheme from another angle;

[0027] Figure 6 This is a perspective structural diagram of the mode converter structure in this scheme;

[0028] Figure 7 This is a perspective view of the mode converter structure of this scheme from another angle;

[0029] Figure 8 This is a schematic diagram of the simulation results for the experimental example of this scheme;

[0030] Figure 9 This is a schematic diagram of the complete structure of a multimode horn antenna;

[0031] Figure 10 The electric field distribution diagrams for the four orthogonal modes in the circular waveguide are shown.

[0032] Figure 11 This is the overall logical relationship diagram of this solution.

[0033] Explanation of reference numerals in the attached figures

[0034] 1. Mode converter structure; 11. First waveguide transmission structure; 111. First transmission channel; 1111. First main channel; 1112. First sub-channel; 1113. Second sub-channel; 112. Second transmission channel; 1121. Second main channel; 1122. Third sub-channel; 1123. Fourth sub-channel; 113. Fourth port; 12. Second waveguide transmission structure; 121. Third transmission channel; 122. Fourth transmission channel; 123. Third port; 2. Orthogonal mode converter structure; 21. First port; 22. Second port; 23. First port transmission channel; 24. Second port transmission channel; 3. Common circular waveguide structure; 31. First circular waveguide; 32. Second circular waveguide; 33. Third circular waveguide; Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the embodiments and accompanying drawings. Here, the illustrative embodiments and descriptions of this invention are used to explain the invention, but are not intended to limit the invention.

[0036] It should also be noted that, in order to avoid obscuring the invention with unnecessary details, only the structures and / or processing steps closely related to the solution according to the invention are shown in the accompanying drawings, while other details that are not closely related to the invention are omitted.

[0037] like Figure 1 , 3 As shown in Figures 4, 6, 7 and 11, this invention proposes a multimode antenna for a non-contact high-speed connector, the multimode antenna comprising a mode converter structure 1, an orthogonal mode converter structure 2 and a common circular waveguide structure 3;

[0038] The common circular waveguide structure includes a first circular waveguide 31, a second circular waveguide 32, and a third circular waveguide 33, whose diameters gradually decrease and are connected sequentially. The first circular waveguide is capable of propagating... The second circular waveguide can propagate The mode in which the third circular waveguide can propagate model;

[0039] The mode converter structure 1 includes a first waveguide transmission structure 11 and a second waveguide transmission structure 12. The first waveguide transmission structure 11 is connected to a first circular waveguide, the second waveguide transmission structure is connected to a second circular waveguide, and the orthogonal mode converter structure is connected to a third circular waveguide.

[0040] By adopting the above scheme, the multimode antenna can support the transmission of multiple orthogonal modes within the same frequency band, significantly improving spectrum utilization and communication capacity. These four modes can propagate simultaneously in a common circular waveguide structure, demonstrating the common-aperture characteristic of the multimode antenna. This design not only makes the antenna structure compact but also significantly reduces its size, facilitating integration into high-density communication equipment and improving communication capacity and data transmission efficiency.

[0041] like Figure 3 As shown, in some embodiments of the present invention, the diameter of the first circular waveguide is greater than 6.8 mm, the diameter of the second circular waveguide is in the range of 4.3 mm to 5.5 mm, and the diameter of the third circular waveguide is in the range of 3.14 mm to 3.45 mm.

[0042] In some embodiments of the present invention, the diameter of the first circular waveguide is 7.4 mm, the diameter of the second circular waveguide is 5.44 mm, and the diameter of the third circular waveguide is 3.36 mm.

[0043] like Figure 1 , 4 As shown in Figure 6, the network includes four excitation ports: port 21, port 22, port 23, and port 113, as well as a port for connecting a horn antenna to radiate the signal. Ports 1, 2, 3, and 4 are used to excite the TE antenna, respectively. 11 x TE 11 y TM 01 and TE 01 Four orthogonal modes, such as Figure 10 As shown. These four modes share a common circular waveguide mode conversion section, the detailed structure of which is shown below. Figure 1 and 2 As shown. This section is for isolating TE. 11 x TE 11 y TM 01 and TE 01 The key components of the mode. [1] The cutoff frequencies of the circular waveguide mode are listed in Table 1. The bold text in Table 1 is the corresponding cutoff frequency of the mode;

[0044] Table 1

[0045]

[0046] By adopting the above scheme and designing the multimode feed network in this way, the multimode antenna can support the transmission of multiple orthogonal modes within the same frequency band, significantly improving spectrum utilization and communication capacity. These four modes can propagate simultaneously in a common circular waveguide, demonstrating the common-aperture characteristic of the multimode antenna. This design not only makes the antenna structure compact but also significantly reduces its size, facilitating integration into high-density communication equipment.

[0047] This multimode feed network can be divided into two parts: an orthogonal mode converter (OMT) and a mode converter. The core function of the OMT is to excite the TE. 11 x and TE 11 y The pattern, and the pattern converter is used to generate the TM. 01 and TE 01 model.

[0048] like Figure 3 As shown, in some embodiments of the present invention, one end of the first circular waveguide of the common circular waveguide structure is used to connect to a horn antenna and receive the millimeter wave transmitted by the horn antenna. One end of the first circular waveguide is used to connect to a circular surface of the second circular waveguide. One end of the second circular waveguide is used to connect to a circular surface of the third circular waveguide. The other circular surface of the third circular waveguide is used to connect to the quadrature mode converter structure.

[0049] like Figure 6 and 7 As shown, in some embodiments of the present invention, the first waveguide transmission structure 11 is a symmetrically arranged first transmission channel 111 and second transmission channel 112. One end of the first transmission channel 111 and the second transmission channel 112 are both connected to the arc surface of the first circular waveguide, and the other ends of the first transmission channel 111 and the second transmission channel 112 are connected together. A fourth port is connected at the connection end of the first transmission channel 111 and the second transmission channel 112.

[0050] like Figure 6 and 7As shown, in some embodiments of the present invention, the first transmission channel 111 includes a first main channel 1111, a first sub-channel 1112, and a second sub-channel 1113. One end of the first sub-channel 1112 and the second sub-channel 1113 are both connected to a first circular waveguide, and the other ends of the first sub-channel 1112 and the second sub-channel 1113 are connected to the first main channel 1111. The second transmission channel 112 includes a second main channel 1121, a third sub-channel 1122, and a fourth sub-channel 1123. One end of the third sub-channel 123 and the fourth sub-channel 113 are both connected to the first circular waveguide, and the other ends of the third sub-channel and the fourth sub-channel are connected to the second main channel 1121.

[0051] In some embodiments of the present invention, the second waveguide transmission structure comprises a symmetrically arranged third transmission channel 121 and a fourth transmission channel 122. One end of each of the third and fourth transmission channels is connected to the arcuate surface of the second circular waveguide, and the other ends of the third and fourth transmission channels are connected together. A third port is connected at the connection end of the third and fourth transmission channels.

[0052] Using the above scheme, the mode converter structure 1 is as follows: Figure 6 As shown, the third and fourth ports are used to excite the TM. 01 and TE 01 In this design, the top port of the common circular waveguide structure is used for connection to the OMT (Outgoing Mode Device), and the bottom port is used for connection to the horn antenna to radiate the signal. This design uses sidewall coupling to connect the fundamental mode (TE) in the rectangular waveguide. 10 Efficient conversion to higher-order modes (TM) in circular waveguides 01 and TE 01 This enables multi-mode transmission. The sidewall coupling structure not only simplifies the design of the mode converter but also improves the excitation efficiency of the modes, ensuring the stable performance of the multi-mode antenna over a wide frequency band.

[0053] like Figure 4 and 5 As shown, in some embodiments of the present invention, the quadrature mode converter structure includes a first port and a second port. The first port is located at one end of the first port transmission channel 23, and the second port is located at one end of the second port transmission channel 24. The first port transmission channel and the second port transmission channel are perpendicular. The first port is used to excite the TE. 11 x Mode, the second port is used to excite TE 11 y model.

[0054] In some embodiments of the present invention, the other end of the first port transmission channel is connected to the third circular waveguide of the common circular waveguide structure, and the other end of the second port transmission channel is connected to the first port transmission channel.

[0055] In some embodiments of the present invention, both the first port transmission channel and the second port transmission channel extend along a straight line, and one end of the first port transmission channel is connected to the circular surface of the third circular waveguide.

[0056] Using the above scheme, the first port and the second port are used to excite the TE. 11 x and TE 11 y The other port of the quadrature mode converter structure is connected to the mode converter. This structure has good isolation performance, which can effectively excite two quadrature modes, while ensuring high isolation between modes, reducing interference, and ensuring signal purity and transmission efficiency.

[0057] Furthermore, the compact design of the quadrature mode converter (QMT) enables it to achieve high isolation while maintaining a small size and high integration. This design not only saves space but also facilitates integration with the mode converter, further enhancing the performance of the entire multimode feed network. Therefore, the QMT plays a crucial role in multimode antenna systems, providing strong support for achieving efficient transmission of multiple orthogonal modes and common-aperture characteristics.

[0058] In practical implementation, the multi-mode power supply network of this scheme can simultaneously excite TE 11 x TE 11 y TM 01 and TE 01 Four orthogonal modes. This design enables the multimode antenna to support the simultaneous transmission of multiple data streams within the same frequency band, significantly improving spectrum utilization and communication capacity. Furthermore, the optimized feed network design ensures low-loss transmission and high isolation between modes, further enhancing the overall antenna performance.

[0059] Experimental example;

[0060] like Figure 9 As shown, Figure 9 Ports 1 and 2 correspond to the first port; ports 2 and 3 correspond to the second port; ports 3 and 4 correspond to the third port; and ports 4 and 5 correspond to the fourth port. To construct a complete multimode horn antenna, the multimode feed network is connected to the horn antenna, forming a configuration as shown below. Figure 9The structure is shown. Simulations of the two multimode horn antennas were performed using HFSS, with simulation conditions of a communication distance of 20mm and an offset of 0mm. The simulation results are as follows. Figure 8 As shown, the transmission coefficient between ports is better than -22.5dB, and the port isolation is better than 32dB. It should be noted that the surface waves and reflected waves generated by the parallel plate structure are the main reasons for the decrease in isolation. Therefore, absorbing materials are used to absorb surface waves and reflected waves, thereby improving isolation performance by suppressing multipath effects.

[0061] In summary, contactless connectors offer significant advantages through multi-channel transmission and miniaturization. Multi-channel transmission significantly improves communication capacity and data transmission efficiency, fully utilizing the spectrum resources of the millimeter-wave band to meet the high-capacity, low-latency requirements of high-density user environments. Simultaneously, miniaturized design makes the connector easier to integrate into compact devices, reducing deployment difficulty and cost, and improving device portability and flexibility. To achieve these advantages, multimode antenna technology becomes crucial. Multimode antennas possess a common aperture characteristic, supporting the simultaneous excitation and transmission of multiple orthogonal modes within the same physical aperture, thereby enabling parallel transmission of multiple data streams. It is precisely because of this common aperture characteristic that the structure of multimode antennas can be highly compact, resulting in significant advantages in miniaturization and facilitating integration into high-density communication devices. This solution, through the efficient design of multimode antennas, enables contactless connectors to achieve efficient and reliable millimeter-wave communication in complex and variable communication environments, providing strong support for future wireless communication systems.

[0062] The beneficial effects of this plan include:

[0063] 1. Multimode feeder networks support simultaneous propagation of four orthogonal modes.

[0064] Multimode feed networks can simultaneously excite and support TE 11 x TE 11 y TM 01 and TE 01 Propagation in four orthogonal modes. By achieving multi-mode transmission within the same frequency band, spectrum utilization and communication capacity are significantly improved, making it particularly suitable for high-density, high-capacity communication scenarios.

[0065] 2. Advantages of miniaturized design in applications

[0066] The common-aperture characteristic of multimode antennas makes their structure highly compact and their size significantly reduced. This miniaturized design facilitates integration into contactless connectors, making them particularly suitable for space-constrained applications such as smartphones, wearable devices, IoT terminals, industrial sensors, and compact base stations. Through miniaturization, contactless connectors can better meet the demands of modern communication devices for high integration and portability, providing an efficient and flexible solution for future wireless communication systems.

[0067] Those skilled in the art will understand that the exemplary components, systems, and methods described in conjunction with the embodiments disclosed herein can be implemented in hardware, software, or a combination of both. Whether implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this invention. When implemented in hardware, it can be, for example, electronic circuits, application-specific integrated circuits (ASICs), appropriate firmware, plug-ins, function cards, etc. When implemented in software, the elements of this invention are programs or code segments used to perform the desired tasks. The programs or code segments can be stored in a machine-readable medium or transmitted over a transmission medium or communication link via data signals carried in a carrier wave.

[0068] It should be clarified that the present invention is not limited to the specific configurations and processes described above and shown in the figures. For the sake of brevity, detailed descriptions of known methods are omitted here. In the above embodiments, several specific steps are described and shown as examples. However, the method process of the present invention is not limited to the specific steps described and shown. Those skilled in the art can make various changes, modifications, and additions, or change the order of steps, after understanding the spirit of the present invention.

[0069] In this invention, features described and / or illustrated for one embodiment may be used in the same or similar manner in one or more other embodiments, and / or combined with or in place of features of other embodiments.

[0070] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, various modifications and variations of the embodiments of the present invention are possible. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A multimode antenna for a non-contact high-speed connector, characterized in that, The multimode antenna includes a multimode feed network, which comprises a mode converter structure, an orthogonal mode converter structure, and a common circular waveguide structure. The common circular waveguide structure includes a first circular waveguide, a second circular waveguide, and a third circular waveguide, whose diameters gradually decrease and are connected sequentially. The first circular waveguide is capable of propagating... The second circular waveguide can propagate The mode in which the third circular waveguide can propagate model; The mode converter structure includes a first waveguide transmission structure and a second waveguide transmission structure. The first waveguide transmission structure is connected to a first circular waveguide, the second waveguide transmission structure is connected to a second circular waveguide, and the orthogonal mode converter structure is connected to a third circular waveguide.

2. The multimode antenna for a non-contact high-speed connector according to claim 1, characterized in that, The diameter of the first circular waveguide is greater than 6.8 mm, the diameter of the second circular waveguide is in the range of 4.3 mm to 5.5 mm, and the diameter of the third circular waveguide is in the range of 3.14 mm to 3.45 mm.

3. The multimode antenna for a non-contact high-speed connector according to claim 2, characterized in that, The diameter of the first circular waveguide is 7.4 mm, the diameter of the second circular waveguide is 5.44 mm, and the diameter of the third circular waveguide is 3.36 mm.

4. The multimode antenna for a non-contact high-speed connector according to claim 1, characterized in that, One end of the first circular waveguide of the common circular waveguide structure is used to connect to a horn antenna and receive the millimeter wave transmitted by the horn antenna. The other end of the first circular waveguide is used to connect to a circular surface of the second circular waveguide. The other end of the second circular waveguide is used to connect to a circular surface of the third circular waveguide. The other circular surface of the third circular waveguide is used to connect to the quadrature mode converter structure.

5. The multimode antenna for a non-contact high-speed connector according to claim 1, characterized in that, The first waveguide transmission structure (11) consists of a first transmission channel (111) and a second transmission channel (112) arranged symmetrically. One end of the first transmission channel (111) and the second transmission channel (112) are connected to the arc surface of the first circular waveguide. The other end of the first transmission channel (111) and the second transmission channel (112) are connected together, and a fourth port is connected at the connection end of the first transmission channel (111) and the second transmission channel (112).

6. The multimode antenna for a non-contact high-speed connector according to claim 5, characterized in that, The first transmission channel (111) includes a first main channel (1111), a first sub-channel (1112), and a second sub-channel (1113). One end of the first sub-channel (1112) and the second sub-channel (1113) are both connected to the first circular waveguide. The other end of the first sub-channel (1112) and the second sub-channel (1113) are connected to the first main channel (1111). The second transmission channel (112) includes a second main channel (1121), a third sub-channel, and a fourth sub-channel. One end of the third sub-channel and the fourth sub-channel are both connected to the first circular waveguide. The other end of the third sub-channel and the fourth sub-channel are connected to the second main channel (1121).

7. The multimode antenna for a non-contact high-speed connector according to claim 6, characterized in that, The second waveguide transmission structure consists of a symmetrically arranged third transmission channel (121) and a fourth transmission channel (122). One end of each of the third and fourth transmission channels is connected to the arc surface of the second circular waveguide, and the other ends of the third and fourth transmission channels are connected together. A third port is connected at the connection end of the third and fourth transmission channels.

8. The multimode antenna for a non-contact high-speed connector according to claim 1, characterized in that, The quadrature mode converter structure includes a first port and a second port. The first port is located at one end of the first port transmission channel, and the second port is located at one end of the second port transmission channel. The first port transmission channel and the second port transmission channel are perpendicular to each other. The first port is used to excite the TE. 11 x Mode, the second port is used to excite TE 11 y model.

9. The multimode antenna for a non-contact high-speed connector according to claim 8, characterized in that, The other end of the first port transmission channel is connected to the third circular waveguide of the common circular waveguide structure, and the other end of the second port transmission channel is connected to the first port transmission channel.

10. The multimode antenna for a non-contact high-speed connector according to claim 9, characterized in that, Both the first port transmission channel and the second port transmission channel extend along a straight line, and one end of the first port transmission channel is connected to the circular surface of the third circular waveguide.

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