A k-band broadband rectangular waveguide to stripline transition structure

By designing a transition structure between substrate-integrated waveguides and metallized via arrays in the millimeter-wave band, the problems of narrow bandwidth, high loss, and high integration difficulty of rectangular waveguide-to-stripline conversion structures are solved. This achieves low-loss, wide-bandwidth mode conversion, improves system integration and miniaturization, and is suitable for radar and satellite communications.

CN122659532APending Publication Date: 2026-08-2810TH RES INST OF CETC
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Patent Information

Application Number
CN202610806796.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-06-05
Publication Date
2026-08-28

AI Technical Summary

Technical Problem

Existing rectangular waveguide and stripline conversion structures in the millimeter-wave band suffer from problems such as narrow operating bandwidth, high insertion loss, high processing precision, and difficulty in vertical integration, making it difficult to meet the design requirements of next-generation millimeter-wave systems for broadband, high integration, miniaturization, and high reliability.

Method used

Using a substrate-integrated waveguide as a right-angle transition bridge, and combining a specially arranged array of metallized vias and a network of adjustable metal vias, a transition structure from a K-band broadband rectangular waveguide to a stripline is designed. By introducing adjustable metal vias and multi-stage matching isolation rings, low-loss, wideband mode conversion between the rectangular waveguide and the stripline is achieved.

Benefits of technology

It broadens the operating bandwidth, reduces standing wave and insertion loss, improves system integration and lightweighting, and achieves efficient conversion from three-dimensional waveguides to planar transmission lines, making it suitable for radar and satellite communication systems.

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Abstract

The application discloses a K-band broadband rectangular waveguide to stripline transition structure, and relates to the field of microwave and millimeter wave integration. The structure comprises a rectangular waveguide, a substrate integrated waveguide and a stripline structure, the last two of which share a dielectric substrate, upper and lower layer metals and a metalized via array. The upper layer metal is provided with first and second coupling windows; the rectangular waveguide is vertically arranged on the upper layer metal and is connected to the first coupling window; the stripline metal extends to the second coupling window and is connected to the substrate integrated waveguide. The metalized via array comprises C-shaped and symmetrically distributed vias. The application realizes low-loss and broadband mode conversion between the waveguide and the stripline based on the substrate integrated waveguide right-angle transition, the specific via arrangement and the matching adjustment network, the working frequency band is 19.7-26.3 GHz, the return loss is less than-20 dB, and the system integration is improved.
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