A multi-mode antenna applied to millimeter wave multi-channel close-range communication

Abstract

The application provides a multi-mode antenna applied to millimeter wave multi-channel close-range communication, the multi-mode antenna comprises an antenna main body, the structure of the antenna main body is a cavity structure with metal inside, and the antenna main body comprises a first feeding structure, a second feeding structure, a stepped waveguide structure and a horn antenna structure; the first feeding structure is provided with a first port and a second port, the input channel directions of the first port and the second port are orthogonally arranged, and the input channels of the first port and the second port meet at a first channel position; the second feeding structure is provided with a third port and a fourth port, the input channel directions of the third port and the fourth port are orthogonally arranged, and the input channels of the third port and the third port meet at a second channel position; the first feeding structure is further provided with a first bent waveguide structure; the second feeding structure is further provided with a second bent waveguide structure; and the stepped waveguide structure is connected with the horn antenna structure to realize millimeter wave signal transmission.

Description

Technical Field

[0001] This invention relates to the field of non-contact connector technology, and in particular to a multimode antenna for millimeter-wave multi-channel short-range communication. Background Technology

[0002] With the rapid development of aerospace, data centers, and high-performance electronic systems, data transmission rates between devices are continuously increasing, placing higher demands on high-speed, high-capacity, and low-latency communication links. In millimeter-wave short-range communication scenarios, limited by installation space and system integration, the traditional method of increasing the number of antennas to achieve multi-channel transmission easily leads to increased system size, complex feed networks, and enhanced inter-channel coupling, thus limiting the improvement of communication capacity. Therefore, how to achieve parallel transmission of multiple independent signals within a limited physical aperture has become an important research direction for millimeter-wave short-range communication.

[0003] Currently, the main methods for improving wireless communication capacity include multiple-input multiple-output (MIMO), polarization multiplexing, and orbital angular momentum (OAM) multiplexing. MIMO relies on multiple antenna arrays and multiple radio frequency links, resulting in high system complexity; polarization multiplexing is limited by dual polarization degrees of freedom, resulting in limited capacity gain; although OAM multiplexing has a high mode dimension, it usually relies on large-size array structures, which have problems such as large size, limited bandwidth, and difficulties in engineering implementation.

[0004] In recent years, multimode antenna technology has attracted widespread attention due to its ability to excite multiple mutually orthogonal eigenmodes within the same physical aperture, achieving mode dimensionality multiplexing. This technology can improve system capacity without significantly increasing antenna size, offering advantages such as compact structure and high integration. However, existing multimode antennas generally suffer from a limited number of modes they can support, making it difficult to meet the high-capacity communication requirements of millimeter-wave multichannel communication. Summary of the Invention

[0005] In view of this, embodiments of the present invention provide a multimode antenna for millimeter-wave multichannel short-range communication to eliminate or improve one or more defects existing in the prior art.

[0006] One aspect of the present invention provides a multimode antenna for millimeter-wave multichannel short-range communication, the multimode antenna for millimeter-wave multichannel short-range communication includes an antenna body, the structure of the antenna body is a cavity structure inside a metal, the antenna body includes a first feeding structure, a second feeding structure, a stepped waveguide structure and a horn antenna structure; The first power supply structure is provided with a first port and a second port. The input channels of the first port and the second port are orthogonally arranged, and the input channels of the first port and the second port converge at the position of the first channel. The second power supply structure is provided with a third port and a fourth port, the input channels of the third port and the fourth port are orthogonally arranged, and the input channels of the third port and the fourth port intersect at the position of the second channel; The first feeding structure is further provided with a first bent waveguide structure extending from the first channel position to the stepped waveguide structure; the second feeding structure is further provided with a second bent waveguide structure extending from the second channel position to the stepped waveguide structure. The stepped waveguide structure is connected to the horn antenna structure to achieve millimeter-wave signal transmission.

[0007] By adopting the above scheme, the present invention forms two transmitting channels and two receiving channels through orthogonally arranged channels in different modes of the first and second feeding structures, thereby enabling the completion of... Four orthogonal modes of propagation enable dual-transmit, dual-receive, multi-channel communication. Based on waveguide orthogonal mode resources, this invention achieves multi-path independent signal transmission under single-aperture conditions. Compared to traditional MIMO, polarization multiplexing, and OAM antenna solutions, it boasts advantages such as compact structure, high integration, numerous channels, high isolation, and high spectral utilization. It can be applied to scenarios such as aerospace-grade wireless interconnection and short-range data center interconnection.

[0008] In some embodiments of the present invention, the multimode antenna for millimeter-wave multichannel short-range communication further includes an absorbing plate, which is disposed over the end of the horn antenna and has an opening.

[0009] In some embodiments of the present invention, the absorbing plate is made of a wave-absorbing material.

[0010] In some embodiments of the present invention, the first feeding structure is provided with two symmetrically arranged first curved waveguide structures, so that when the millimeter wave signal is input from the first port, the two first curved waveguide structures achieve equal amplitude and in-phase output; while when the signal is input from the second port, the two first curved waveguide structures achieve equal amplitude and out-of-phase output.

[0011] In some embodiments of the present invention, the first feeding structure is further provided with a secondary metal diaphragm, the secondary metal diaphragm being disposed at the first channel position, and the two sides of the secondary metal diaphragm being the ports of two first curved waveguide structures respectively.

[0012] In some embodiments of the present invention, the second feeding structure is provided with two symmetrically arranged second curved waveguide structures, so that when the millimeter wave signal is input from the third port, the two second curved waveguide structures achieve equal amplitude and in-phase output; while when the signal is input from the fourth port, the two second curved waveguide structures achieve equal amplitude and out-of-phase output.

[0013] In some embodiments of the present invention, the second feeding structure is further provided with a four-stage metal diaphragm, which is disposed at the second channel position, and the two sides of the four-stage metal diaphragm are the ports of two second bend waveguide structures respectively.

[0014] In some embodiments of the present invention, the second feeding structure is further provided with a four-stage stepped waveguide. The four-stage stepped waveguide is provided at the connection between the input channel of the third port and the second channel. The four-stage stepped waveguide is provided with three unidirectional steps and one anti-directional step. The anti-directional step is provided on the side of the four-stage stepped waveguide closer to the third port, and the unidirectional step is provided on the side of the four-stage stepped waveguide away from the third port.

[0015] In some embodiments of the present invention, the stepped waveguide structure includes an impedance-matching stepped waveguide structure and an open stepped waveguide structure. The impedance-matching stepped waveguide structure and the open stepped waveguide structure are connected. The impedance-matching stepped waveguide structure is provided with a first connection port corresponding to the first bend waveguide structure and a second connection port corresponding to the second bend waveguide structure. The first connection port extends to the open stepped waveguide structure. The impedance-matching stepped waveguide structure is further provided with a three-stage stepped waveguide. One end of the three-stage stepped waveguide is connected to the open stepped waveguide structure. The three-stage stepped waveguide consists of three steps in the same direction. The cross-section of the three-stage stepped waveguide gradually decreases along the extension direction of the three steps in the same direction and is connected to the second connection port at its end.

[0016] In some embodiments of the present invention, the open stepped waveguide structure is a five-stage stepped waveguide, wherein the five-stage stepped waveguide has two protruding ribs in a side view and a recess in a top view.

[0017] 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.

[0018] Those skilled in the art will understand that the objectives and advantages achievable with this invention are not limited to those specifically described above, and that the above and other objectives achievable with this invention will become clearer from the following detailed description. Attached Figure Description

[0019] 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.

[0020] Figure 1This is a schematic diagram of the multimode antenna in this scheme; Figure 2 This is a partial structural diagram of the first power supply structure in this scheme; Figure 3 This is a partial structural diagram of the second power supply structure in this scheme; Figure 4 This is a schematic diagram of the combination of the stepped waveguide structure and the horn antenna structure in this scheme; Figure 5 This is a schematic diagram of one side of the stepped waveguide structure in this scheme; Figure 6 This is a schematic diagram of the stepped waveguide structure of this scheme from another perspective; Figure 7 This is a schematic diagram of a multimode antenna combination; Figure 8 This is a schematic diagram illustrating the combined transmission of a multimode antenna. Figure 9 This is a schematic diagram of the reflection coefficient for the experimental case; Figure 10 This is a schematic diagram of the transmission coefficients for the experimental case; Figure 11 This diagram illustrates the isolation from the first port of one multimode antenna to the first port when the signal transmitted from the first port of the multimode antenna on one side is received by the first port of the multimode antenna on the other side. Figure 12 This diagram illustrates the isolation between the first port of one multimode antenna, the third and fourth ports of the other multimode antenna, and the second port of the other multimode antenna when the signal transmitted from the second port of one multimode antenna is received by the second port of the other multimode antenna. Figure 13 This diagram illustrates the isolation between the first and second ports of one multimode antenna, the fourth port of the other multimode antenna, and the third port of one multimode antenna when the signal transmitted from the third port of the other multimode antenna is received by the third port of the multimode antenna on one side. Figure 14 This diagram illustrates the isolation between the first and second ports of one multimode antenna, the third port of the other multimode antenna, and the fourth port of the other multimode antenna when the signal transmitted from the fourth port of the other multimode antenna is received by the fourth port of the multimode antenna on one side. Figure 15 A schematic diagram of the electric field distribution between the plates when adding the absorbing plate to this scheme; Figure 16 This is a schematic diagram of the electric field distribution between the plates in this scheme without the addition of a microwave absorbing plate.

[0021] Explanation of reference numerals in the attached figures 1. Antenna body; 11. First feed structure; 111. First port; 112. Second port; 113. First channel position; 114. First bend waveguide structure; 115. Secondary metal diaphragm; 12. Second feed structure; 121. Third port; 122. Fourth port; 123. Second channel position; 124. Second bend waveguide structure; 125. Quadruple metal diaphragm; 126. Quadruple stepped waveguide; 13. Stepped waveguide structure; 131. Impedance-matched stepped waveguide structure; 1311. First connection port; 1312. Second connection port; 1313. Tertiary stepped waveguide; 132. Open stepped waveguide structure; 1321. Protruding rib; 1322. Recess; 14. Horn antenna structure; 2. Absorbing plate. Detailed Implementation

[0022] 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.

[0023] 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.

[0024] Existing multimode antennas generally suffer from problems such as a limited number of modes they can support, complex feeding networks, and insufficient isolation between modes, making it difficult to meet the high-capacity communication requirements of millimeter-wave multi-channels.

[0025] like Figure 1 As shown, the present invention proposes a multimode antenna for millimeter-wave multichannel short-range communication. The multimode antenna for millimeter-wave multichannel short-range communication includes an antenna body 1. The antenna body 1 has a cavity structure inside a metal. The antenna body 1 includes a first feeding structure 11, a second feeding structure 12, a stepped waveguide structure 13, and a horn antenna structure 14. like Figure 2 As shown, in the specific implementation process, the first feeding structure 11 adopts a magic-T feeding structure with the first port 111 and the second port 112, the second feeding structure 12 adopts a magic-T feeding structure with the third port 121 and the fourth port 122, and the horn antenna structure 14 is a quadrangular pyramidal horn antenna connected to the open stepped waveguide structure 132.

[0026] The first power supply structure 11 is provided with a first port 111 and a second port 112. The input channel directions of the first port 111 and the second port 112 are orthogonal, and the input channels of the first port 111 and the second port 112 converge at the first channel position 113. In the specific implementation process, the first port 111 serves as the H-arm input port in the magic T power supply structure of the first port 111 and the second port 112, and the second port 112 serves as the E-arm input port in the magic T power supply structure of the first port 111 and the second port 112.

[0027] like Figure 3 As shown, Figure 3 The green line in the middle corresponds to the path of the fourth port 122. The second power supply structure 12 is provided with a third port 121 and a fourth port 122. The input channel directions of the third port 121 and the fourth port 122 are orthogonal. The input channels of the third port 121 and the third port 122 intersect at the second channel position 123. In the specific implementation process, the third port 121 serves as the E-arm input port of the magic T-feed structure of the third port 121 and the fourth port 122, and the fourth port 122 serves as the H-arm input port of the magic T-feed structure of the third port 121 and the fourth port 122. The input channels of the third port 121 and the fourth port 122 intersect at the second channel position 123.

[0028] The first feeding structure 11 is further provided with a first curved waveguide structure 114 extending from the first channel position 113 to the stepped waveguide structure 13; the second feeding structure 12 is further provided with a second curved waveguide structure 124 extending from the second channel position 123 to the stepped waveguide structure 13. The stepped waveguide structure 13 is connected to the horn antenna structure 14 to realize millimeter wave signal transmission.

[0029] By adopting the above scheme, the present invention forms two transmitting channels and two receiving channels through orthogonally arranged channels in different modes of the first feeding structure 11 and the second feeding structure 12, thereby enabling the completion of... Four orthogonal modes of propagation enable dual-transmit, dual-receive, multi-channel communication. Based on waveguide orthogonal mode resources, this invention achieves multi-path independent signal transmission under single-aperture conditions. Compared to traditional MIMO, polarization multiplexing, and OAM antenna solutions, it boasts advantages such as compact structure, high integration, numerous channels, high isolation, and high spectral utilization. It can be applied to scenarios such as aerospace-grade wireless interconnection and short-range data center interconnection.

[0030] In the specific implementation process, when the first port 111 is excited, the waveguide propagates... The mode propagates in the stepped waveguide when the second port 112 is excited. The mode propagates in the stepped waveguide when the third port 121 is excited. The mode propagates in the stepped waveguide when the fourth port 122 is excited. The open-type stepped waveguide structure 132 will respectively excite the mode, open-type stepped waveguide structure 132 to generate Four mutually orthogonal eigenmodes constitute four independent communication channels, enabling multi-channel transmission with dual transmit and dual receive capabilities.

[0031] like Figure 7 In some embodiments of the present invention, the multimode antenna for millimeter-wave multichannel short-range communication further includes an absorbing plate 2, which covers the end of the horn antenna and has an opening.

[0032] In some embodiments of the present invention, the absorbing plate 2 uses an absorbing material that matches the operating frequency band.

[0033] Absorbing materials suppress surface waves and reflected waves propagating on the structural surface, improving the isolation of the transmitting and receiving channels from the perspective of multipath interference, and realizing highly stable multi-channel communication.

[0034] Using the above scheme, the absorbing plate 2 covers the non-radiating surface of the multimode antenna, and an opening is reserved at the radiating port of the horn antenna structure 14 so that the main radiating beam output by the horn antenna structure 14 can radiate to the outside through the reserved opening; the absorbing plate 2 absorbs the surface waves and reflected waves propagating on the antenna surface, thereby reducing the additional interference caused by multipath coupling between the transmitting and receiving multimode antennas.

[0035] In some embodiments of the present invention, the first feeding structure 11 is provided with two symmetrically arranged first curved waveguide structures 114, so that when the millimeter wave signal is input from the first port 111, the two first curved waveguide structures 114 achieve equal amplitude and in-phase output; while when the signal is input from the second port 112, the two first curved waveguide structures 114 achieve equal amplitude and out-of-phase output.

[0036] In some embodiments of the present invention, the two first bend waveguide structures 114 are two collinear H-arm bend waveguides of the magic-T feed structure of the first port 111 and the second port 112.

[0037] like Figure 2 As shown, in some embodiments of the present invention, the first feeding structure 11 is further provided with a secondary metal diaphragm 115, the secondary metal diaphragm 115 is disposed at the first channel position 113, and the two sides of the secondary metal diaphragm 115 are the ports of two first curved waveguide structures 114 respectively.

[0038] By adopting the above scheme, by setting the first port 111 and the second port 112 as positive traffic channels and configuring a secondary metal diaphragm 115 at the intersection, the signal input from the first port 111 can be output as equal amplitude and in phase through two collinear H-arm bend waveguides, and the signal input from the second port 112 can be output as equal amplitude and out of phase through two collinear H-arm bend waveguides, thus providing phase conditions for the excitation of modes with different field distributions.

[0039] In some embodiments of the present invention, the second feeding structure 12 is provided with two symmetrically arranged second curved waveguide structures 124, so that when the millimeter wave signal is input from the third port 121, the two second curved waveguide structures 124 achieve equal amplitude and in-phase output; while when the signal is input from the fourth port 122, the two second curved waveguide structures 124 achieve equal amplitude and out-of-phase output.

[0040] Specifically, the two second-bend waveguide structures 124 serve as two co-directional E-arm bend waveguides of the magic-T feed structure of the third port 121 and the fourth port 122.

[0041] like Figure 3 As shown, in some embodiments of the present invention, the second feeding structure 12 is further provided with a four-stage metal diaphragm 125, which is disposed at the second channel position 123, and the two sides of the four-stage metal diaphragm 125 are the ports of two second curved waveguide structures 124 respectively.

[0042] like Figure 3 As shown, in some embodiments of the present invention, the second feeding structure 12 is further provided with a four-stage stepped waveguide 126. The four-stage stepped waveguide 126 is provided at the connection between the input channel of the third port 121 and the second channel position 123. The four-stage stepped waveguide 126 is provided with three unidirectional steps and one anti-directional step. The anti-directional step is provided on the side of the four-stage stepped waveguide 126 closer to the third port 121, and the unidirectional step is provided on the side of the four-stage stepped waveguide 126 away from the third port 121.

[0043] Using the above scheme, the second feeding structure 12, through the E-arm second-stage stepped waveguide 126, the H-arm fourth-stage stepped waveguide 126, the co-directional E-arm bent waveguide, and the fourth-stage metal diaphragm 125, jointly adjusts the amplitude and phase relationship of the input signals at the third port 121 and the fourth port 122, so that the signal input from the third port 121 forms an equal amplitude and in phase output through the two co-directional E-arm bent waveguides, and the signal input from the fourth port 122 forms an equal amplitude and out-of-phase output through the two co-directional E-arm bent waveguides, thereby enabling the second feeding structure 12 to excite different orthogonal modes in the open stepped waveguide structure 132, respectively, with the first feeding structure 11.

[0044] like Figure 4 , 5As shown in Figure 6, in some embodiments of the present invention, the stepped waveguide structure 13 includes an impedance-matching stepped waveguide structure 131 and an open stepped waveguide structure 132. The impedance-matching stepped waveguide structure 131 and the open stepped waveguide structure 132 are connected. The impedance-matching stepped waveguide structure 131 is provided with a first connection port 1311 corresponding to the first bent waveguide structure 114 and a second connection port 1312 corresponding to the second bent waveguide structure 124. The first connection port 1311 extends to the open stepped waveguide structure 132. The impedance-matching stepped waveguide structure 131 is also provided with a three-stage stepped waveguide 1313. One end of the three-stage stepped waveguide 1313 is connected to the open stepped waveguide structure 132. The three-stage stepped waveguide 1313 consists of three steps in the same direction. The cross-section of the three-stage stepped waveguide 1313 gradually decreases along the extension direction of the three steps in the same direction and is connected to the second connection port 1312 at its end.

[0045] One end of the three-stage stepped waveguide 1313 is connected to the open stepped waveguide structure 132, and the other end is connected to the corresponding connection port to achieve impedance matching and energy transmission between the feed network and the open stepped waveguide structure 132.

[0046] In some embodiments of the present invention, the open stepped waveguide structure 132 is a five-stage stepped waveguide, wherein the five-stage stepped waveguide has two protruding ribs 1321 in a side view and a recess 1322 in a top view.

[0047] After receiving signals from the impedance-matched stepped waveguide structure 131 and the second feed structure 12, the open stepped waveguide structure 132 respectively supports Stable propagation of four mutually orthogonal modes.

[0048] By adopting the above scheme, by placing the impedance-matched stepped waveguide structure 131 between the first feed structure 11 and the open stepped waveguide structure 132, the signals input to the first port 111 and the second port 112 can complete the impedance transition before entering the open stepped waveguide structure 132; the signals input to the third port 121 and the fourth port 122 directly participate in the mode excitation within the open stepped waveguide structure 132, enabling the four port signals to form mutually orthogonal transmission modes within the same open stepped waveguide structure 132.

[0049] Experimental example: like Figure 7As shown, to verify the effectiveness and isolation performance of this scheme, a multimode antenna operating in the 59GHz to 64GHz frequency band was designed, and simulation verification was performed under a 20mm communication spacing condition. The transmit and receive multimode antennas can be configured in a paired manner to form a dual-transmit, dual-receive communication layout. The first port 111 and the second port 112 of one side of the multimode antenna can be used as transmit ports, and the first port 111 and the second port 112 of the other side of the multimode antenna can be used as corresponding receive ports; the third port 121 and the fourth port 122 of the other side of the multimode antenna can be used as transmit ports, and the third port 121 and the fourth port 122 of one side of the multimode antenna can be used as corresponding receive ports, as shown. Figure 8 As shown.

[0050] When a signal transmitted from the first port 111 of one multimode antenna is received by the first port 111 of another multimode antenna, the signals transmitted from the second port 112 of one multimode antenna and the third port 121 and fourth port 122 of the other multimode antenna interfere with the first port 111 of the other multimode antenna; when a signal transmitted from the second port 112 of one multimode antenna is received by the second port 112 of another multimode antenna, the signals transmitted from the first port 111 of one multimode antenna and the third port 121 and fourth port 122 of the other multimode antenna interfere with the second port 112 of the other multimode antenna. When the signal transmitted from the third port of the multimode antenna on the other side is received by the third port 121 of the multimode antenna on one side, the signals transmitted from the first port 111 and the second port 112 of the multimode antenna on one side, and the fourth port 122 of the multimode antenna on the other side, interfere with the third port 121 of the multimode antenna on one side; when the signal transmitted from the fourth port 122 of the multimode antenna on the other side is received by the fourth port 122 of the multimode antenna on one side, the signals transmitted from the first port 111 and the second port 112 of the multimode antenna on one side, and the third port 121 of the multimode antenna on the other side, interfere with the fourth port 122 of the multimode antenna on one side.

[0051] like Figures 9-14 As shown, under a 20mm communication spacing condition, the multimode antenna has a port reflection coefficient less than or equal to -12dB, a transmission coefficient greater than or equal to -20dB, and a worst-case port isolation greater than or equal to 34dB in the operating frequency range of 59GHz to 64GHz. Figure 15 and 16 As shown, the electric field distribution results between the multimode transceiver antennas with and without absorbing surfaces indicate that the absorbing material has an absorption effect on surface waves and reflected waves formed by the parallel plate structure.

[0052] In summary, this scheme uses two sets of magic-T feed networks to excite different mode channels in an open waveguide structure, thereby forming two transmit channels and two receive channels to achieve dual-transmit, dual-receive, multi-channel communication. Simultaneously, a rational structural design improves the isolation between the four channels. In a preferred embodiment of this invention, absorbing material is introduced onto the surface of the structure to absorb surface waves and reflected waves generated between the transmitting and receiving antennas, thereby reducing multipath coupling interference and improving system isolation performance and stability. Based on waveguide orthogonal mode resources, this invention achieves multi-path independent signal transmission under single-aperture conditions. Compared to traditional MIMO, polarization multiplexing, and OAM antenna schemes, it has advantages such as compact structure, high integration, a large number of channels, high isolation, and high spectral utilization, and can be applied to scenarios such as aerospace-grade inter-wireless interconnection and short-range interconnection in data centers.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] 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 millimeter-wave multichannel short-range communication, characterized in that, The multimode antenna used for millimeter-wave multichannel short-range communication includes an antenna body, the structure of which is a cavity structure inside a metal, and the antenna body includes a first feeding structure, a second feeding structure, a stepped waveguide structure, and a horn antenna structure. The first power supply structure is provided with a first port and a second port. The input channels of the first port and the second port are orthogonally arranged, and the input channels of the first port and the second port converge at the position of the first channel. The second power supply structure is provided with a third port and a fourth port, the input channels of the third port and the fourth port are orthogonally arranged, and the input channels of the third port and the fourth port converge at the position of the second channel; The first feeding structure is further provided with a first bent waveguide structure extending from the first channel position to the stepped waveguide structure; the second feeding structure is further provided with a second bent waveguide structure extending from the second channel position to the stepped waveguide structure. The stepped waveguide structure is connected to the horn antenna structure to achieve millimeter-wave signal transmission.

2. The multimode antenna for millimeter-wave multi-channel short-range communication according to claim 1, characterized in that, The multimode antenna used for millimeter-wave multi-channel short-range communication also includes an absorbing plate, which is disposed over the end of the horn antenna and has an opening.

3. The multimode antenna for millimeter-wave multichannel short-range communication according to claim 2, characterized in that, The absorbing plate is made of absorbing material.

4. The multimode antenna for millimeter-wave multi-channel short-range communication according to claim 1, characterized in that, The first feeding structure is provided with two symmetrically arranged first curved waveguide structures, so that when the millimeter wave signal is input from the first port, the two first curved waveguide structures achieve equal amplitude and in-phase output; while when the signal is input from the second port, the two first curved waveguide structures achieve equal amplitude and out-of-phase output.

5. The multimode antenna for millimeter-wave multichannel short-range communication according to claim 4, characterized in that, The first feeding structure is further provided with a secondary metal diaphragm, which is located at the first channel position, and the two sides of the secondary metal diaphragm are the ports of two first curved waveguide structures.

6. The multimode antenna for millimeter-wave multi-channel short-range communication according to claim 1, characterized in that, The second feeding structure is provided with two symmetrically arranged second curved waveguide structures, so that when the millimeter wave signal is input from the third port, the two second curved waveguide structures achieve equal amplitude and in-phase output; while when the signal is input from the fourth port, the two second curved waveguide structures achieve equal amplitude and out-of-phase output.

7. The multimode antenna for millimeter-wave multichannel short-range communication according to claim 6, characterized in that, The second feeding structure is also provided with a four-stage metal diaphragm, which is located at the second channel position. The two sides of the four-stage metal diaphragm are the ports of two second bend waveguide structures.

8. The multimode antenna for millimeter-wave multichannel short-range communication according to claim 1, characterized in that, The second feeding structure is also provided with a four-stage stepped waveguide. The four-stage stepped waveguide is provided at the connection between the input channel of the third port and the second channel. The four-stage stepped waveguide is provided with three unidirectional steps and one anti-directional step. The anti-directional step is provided on the side of the four-stage stepped waveguide closer to the third port, and the unidirectional step is provided on the side of the four-stage stepped waveguide away from the third port.

9. The multimode antenna for millimeter-wave multichannel short-range communication according to claim 1, characterized in that, The stepped waveguide structure includes an impedance-matching stepped waveguide structure and an open stepped waveguide structure. The impedance-matching stepped waveguide structure and the open stepped waveguide structure are connected. The impedance-matching stepped waveguide structure has a first connection port corresponding to the first bend waveguide structure and a second connection port corresponding to the second bend waveguide structure. The first connection port extends to the open stepped waveguide structure. The impedance-matching stepped waveguide structure also includes a three-stage stepped waveguide. One end of the three-stage stepped waveguide is connected to the open stepped waveguide structure. The three-stage stepped waveguide consists of three steps in the same direction. The cross-section of the three-stage stepped waveguide gradually decreases along the extension direction of the three steps in the same direction and is connected to the second connection port at its end.

10. The multimode antenna for millimeter-wave multichannel short-range communication according to claim 9, characterized in that, The open stepped waveguide structure is a five-stage stepped waveguide. The five-stage stepped waveguide has two protruding ribs in the side view and a recess in the top view.

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