Grounding coplanar waveguide-rectangular waveguide filtering transition structure

Abstract

A grounding coplanar waveguide-rectangular waveguide filtering transition structure comprises a substrate (1), the upper and lower surfaces of which are plated with metal layers; a grounding coplanar waveguide transmission line (2), printed on the metal layer (1-1) on the upper surface of the substrate and used for inputting electromagnetic waves; a broadband filtering transition structure (3), etched on the metal layer (1-2) on the lower surface of the substrate, connected with the rectangular waveguide (5), comprising a feed branch knot (3-1), a short-circuit branch knot (3-3), a coupling branch knot (3-2) and a resonant cavity, and used for broadband transmission and out-of-band rejection performance of electromagnetic waves; and a first metalized via hole (4) penetrating through the substrate (1) and connecting the output end of the grounding coplanar waveguide transmission line (2) with the feed branch knot (3-1). According to the transition structure, on one hand, the broadband filtering transition structure (3) can be arranged at the bottom of the substrate (1) to be grounded so as to avoid large radiation loss, on the other hand, the working bandwidth of electromagnetic wave transmission can be increased through mutual coupling (3) among various resonant structures, and the transition structure has good out-of-band suppression filtering performance.

Description

technical field [0001] The present disclosure relates to the technical field of millimeter-wave terahertz research, and in particular to a grounded coplanar waveguide-rectangular waveguide filter transition structure. Background technique [0002] With the development of terahertz technology in the field of wireless communication, monolithic integrated circuits, hybrid integrated circuits and integrated microsystems have broad application prospects in communication, radar and other fields. Grounded Coplanar Waveguide (GCPW for short) is a planar circuit transmission line with small dispersion and low loss. It is very easy to realize series and parallel connection with passive and active devices, which can significantly improve circuit density and transmission efficiency; rectangular waveguide (RectangularWaveguide, abbreviated as RWG) has the characteristics of simple structure, stable mechanical performance, and low loss, and has become the most commonly used packaging inte...

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Problems solved by technology

Although the transition mode of gap coupling can provide a simple micro-assembly process, the insertion loss of the structure is large due to the radiation loss caused by its resonant mode.

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