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CN-115882228-B - Millimeter wave flat slot array antenna with implanted filtering function

CN115882228BCN 115882228 BCN115882228 BCN 115882228BCN-115882228-B

Abstract

The invention discloses a millimeter wave flat slot array antenna with implanted filtering function, which relates to the technical field of radio frequency communication and comprises a copper-based micro-coaxial line-quasi-planar waveguide transition structure, a staggered vertical layout cross-coupled millimeter wave filter, a quasi-planar waveguide feed power division network and a high-order mode flat slot antenna array. The copper-based micro-coaxial line-quasi-planar waveguide transition structure is connected with a staggered cross-coupled millimeter wave filter in a vertical layout, and is integrated with a quasi-planar waveguide feed power division network to realize a three-dimensional quasi-planar low-loss integrated feed circuit, and the feed circuit excites a high-order mode flat plate slot antenna array through a coupling slot. The invention utilizes the multilayer metal plane and vertical design capability of the electrochemical material adding technology, breaks through the key problems of low process complexity and low loss of interconnection integration transition interfaces, low loss of miniaturized filter structures, integrated integration of the residual limited special-shaped physical space of the array antenna and the like, and meets the practical application requirements of miniaturization and integration of millimeter wave radio frequency communication systems.

Inventors

  • XU JIN
  • WAN HAO
  • CHEN ZHIYU

Assignees

  • 西北工业大学

Dates

Publication Date
20260508
Application Date
20221115

Claims (5)

  1. 1. Millimeter wave flat slot array antenna with implanted filtering function, which is characterized by comprising: A copper-based micro-coaxial line-quasi-planar waveguide transition structure (100); The millimeter wave filter (200) is characterized in that a rectangular resonant cavity arranged on the millimeter wave filter is directly connected with the copper-based micro-coaxial line-quasi-planar waveguide transition structure (100) through a quasi-planar waveguide; the input port of the quasi-planar waveguide feed power division network (300) is directly connected with the rectangular resonant cavity of the millimeter wave filter (200) which is crossly coupled in a staggered vertical layout; The copper-based micro-coaxial line-quasi-planar waveguide transition structure (100), the millimeter wave filter (200) and the quasi-planar waveguide feed power division network (300) are integrated to realize a feed circuit of the three-dimensional quasi-planar low-loss integrated array antenna; A higher order mode flat slot antenna array (400) arranged above the feed circuit, wherein the feed circuit excites the higher order mode flat slot antenna array (400) through a coupling slot (418); the copper-based micro-coaxial-quasi-planar waveguide transition structure (100) comprises: The copper-based rectangular micro-coaxial inner conductor (101) and the copper-based rectangular micro-coaxial outer conductor (102) are input feeder lines; The double-section cylindrical feed probe is formed by vertically connecting a cylindrical joint with concentric metal cylinders with different diameters, and is connected with the copper-based rectangular micro-coaxial inner conductor (101) through the cylindrical joint; the quasi-plane rectangular waveguide (106) is excited by a double-section cylindrical feed probe introduced by the common metal layer opening, so that the transition of signals from micro-coaxial to rectangular waveguide is realized; a plurality of dielectric support bars (103) for supporting the copper-based rectangular micro-coaxial inner conductor (101); the staggered vertical layout cross-coupled millimeter wave filter (200) comprises a plurality of rectangular resonant cavities, coupling gaps, coupling windows and a plurality of release holes (209) for releasing photoresist, wherein the rectangular resonant cavities are staggered vertically by utilizing the residual special-shaped space of a feed network; the rectangular resonant cavities are vertically distributed through the common metal layer, and are staggered, and the rectangular resonant cavities are distributed up and down: the coupling mode between the 1 st rectangular resonant cavity and the 2 nd rectangular resonant cavity is that rectangular slot grooves are formed in the common metal layer of the two resonators for inductive coupling; the coupling mode between the 2 nd rectangular resonant cavity and the 3 rd rectangular resonant cavity is that two diaphragms form a coupling window between the two resonators to serve as inductive coupling between the two resonators; the coupling mode between the 3 rd rectangular resonant cavity and the 4 th rectangular resonant cavity is the same as the coupling mode between the 1 st rectangular resonant cavity and the 2 nd rectangular resonant cavity; The connection mode between the 4 th rectangular resonant cavity and the 1 st rectangular resonant cavity is that two diaphragms are loaded between the two resonant cavities to form a coupling window, and mushroom diaphragms are placed in the middle of the coupling window to serve as capacitive coupling between the 4 th rectangular resonant cavity and the 1 st rectangular resonant cavity; The quasi-planar waveguide feed power division network (300) comprises n stages of 2 n -1H-plane waveguide T-shaped junctions, wherein each single H-plane T-shaped junction comprises an input end waveguide, an output end waveguide, a diaphragm, a trapezoid inductive groove and a plurality of release holes; The high-order mode flat plate slot antenna array (400) comprises 16 slot antenna units which are symmetrically and equidistantly distributed and comprise a feed waveguide, a coupling slot, a metal cavity and a radiation slot.
  2. 2. The millimeter wave flat slot array antenna with the implanted filtering function of claim 1, wherein the feeding circuit excites the high-order mode flat slot array antenna (400) through a coupling slot (418), specifically, the quasi-planar waveguide feeding power division network (300) opens the coupling slot on the metal upper wall of the output port to realize the excitation of the high-order mode flat slot array antenna (400).
  3. 3. The millimeter wave flat-panel slot array antenna with implanted filtering function according to claim 1, wherein the copper-based rectangular micro-coaxial outer conductor (102) is smoothly transited into a cylindrical cavity at the tail end, and forms a circular coaxial line together with a cylindrical joint of the double-section cylindrical feed probe.
  4. 4. The millimeter wave flat slot array antenna of claim 1, wherein the order of main coupling is 1-2-3-4 and the order of cross coupling is 1-4.
  5. 5. The millimeter wave flat slot array antenna of claim 1, wherein the feed waveguide is an output port of a last stage T-shaped junction of the power division network, excitation of the metal cavity TE 201 mode is achieved through a coupling slot, the metal cavity is divided into 4 parts by a cavity wall, a radiation slot is respectively opened on metal upper walls of the four cavities, and the radiation slot abuts against four corners of the metal cavity in the horizontal direction.

Description

Millimeter wave flat slot array antenna with implanted filtering function Technical Field The invention relates to the technical field of radio frequency communication, in particular to a millimeter wave flat slot array antenna with implanted filtering function. Background With the continuous development of modern wireless communication technology, limited spectrum resources are becoming increasingly crowded, available frequency bands are becoming increasingly insufficient, and people focus on millimeter wave communication systems applied to higher frequencies and wider bandwidths. The millimeter wave communication system has the advantages of available bandwidth, large channel capacity of the communication system, miniaturization of devices, easy realization and the like. However, the dielectric loss of the conventional transmission line in the millimeter wave frequency band becomes strong, the coupling between lines and the radiation effect are obvious, and the integration and miniaturization of the millimeter wave system are limited. The novel transmission line based on electrochemical additive manufacturing not only has the advantages of low loss and high line-to-line isolation in a wide frequency band, but also has the characteristics of quasi-plane, self-packaging and easy interconnection integration, so that great potential advantages exist in the design of an integrated and miniaturized millimeter wave communication system. Filters and antennas are very common as functional components for frequency selection and radiation, in the case of functional integration in millimeter wave microsystems. On the one hand, the scheme of independently designing and re-cascading the filter and the antenna cannot meet the development trend of smaller and smaller volume weight, higher and higher electrical performance and more electrical functions of the millimeter wave system, and the function of integrating the millimeter wave filter by utilizing the limited special-shaped physical space which can be provided by the array antenna has important practical significance. On the other hand, the copper-based micro-coaxial millimeter wave filter can not be directly tested and is interconnected and integrated with other transmission line modules, and the design and research of the related interconnection integrated transition interface are insufficient, so that the application scene of copper-based micro-coaxial is severely restricted. Disclosure of Invention Aiming at the problems that the traditional medium substrate transmission line is large in millimeter wave frequency band loss, the metal cavity waveguide is difficult to integrate and miniaturize, the circuit redundancy and the inter-stage mismatch are caused by the traditional multifunctional collaborative design method, the invention provides a design method of a millimeter wave flat slot array antenna with an implanted filtering function based on copper-based micro coaxial lines, the invention combines the advantage of vertical layout of a three-dimensional multilayer metal structure, designs a capacitive coupling path and a inductive coupling path to introduce cross coupling to generate a transmission zero point, provides a design method of a millimeter wave filter with a limited special-shaped physical space, constructs an interconnection integration transitional interface design method and technology of the copper-based micro coaxial lines and the quasi-planar metal waveguide, solves the problems of high complexity and high loss of the transitional structure, and flexibly designs the dislocation arrangement vertical layout of the millimeter wave filter based on the theory and the method of the multi-device functional collaborative design to fully utilize the residual special-shaped space of the array antenna, and provides an integrated design and integration method of a high-order mode radiation unit antenna array and a three-dimensional quasi-planar low-loss feed circuit, thereby being beneficial to realizing a system with light weight, high integration and high millimeter wave performance. In order to achieve the above purpose, the invention provides a technical scheme that the millimeter wave flat slot array antenna with the implanted filtering function comprises: A copper-based micro-coaxial line-quasi-planar waveguide transition structure; the rectangular resonant cavity arranged on the millimeter wave filter is directly connected with the copper-based micro-coaxial line-quasi-planar waveguide transition structure through the quasi-planar waveguide; The input port of the quasi-planar waveguide feed power division network is directly connected with the rectangular resonant cavity of the staggered vertical layout cross-coupled millimeter wave filter; The copper-based micro-coaxial line-quasi-planar waveguide transition structure, the millimeter wave filter and the quasi-planar waveguide feed power division network are integrated to realize a feed circuit of