Miniaturized broadband slow-wave half-mode substrate-integrated waveguide coupler and design method thereof

Abstract

The invention discloses a miniaturized broadband slow-wave half-mode substrate-integrated waveguide coupler and a design method thereof. An open edge of a half-mode substrate-integrated waveguide transmission line is utilized as a coupling part of the coupler and a microstrip multistage line network is formed by etching on the surface to replace a novel coupler structure formed by a traditional metal surface. Compared with a traditional substrate-integrated waveguide coupler, the miniaturized broadband slow-wave half-mode substrate-integrated waveguide coupler has the advantages that a slow wave effect is formed by introducing a microstrip multistage line into an inductive load, so that the physical size of a coupling edge is effectively reduced; the coupling characteristic of the coupler can be sensitively affected by a multi-parameter adjustable microstrip multistage line structure and the coupling coefficient and the coupling bandwidth can be more flexibly and effectively controlled; meanwhile, a new design freedom is provided for optimization of various performance indexes of the coupler by multiple parameters with adjustable structure sizes in the microstrip multistage line; and compared with a traditional substrate-integrated waveguide coupler, the formed novel coupler has a lower profile, a larger working bandwidth and better coupling performance.

Description

technical field [0001] The invention relates to the field of couplers, in particular to a miniaturized broadband slow-wave half-mode substrate integrated waveguide coupler and a design method thereof. Background technique [0002] In recent years, with the rapid development of microwave and millimeter wave communication systems, substrate integrated waveguide (SIW) technology has attracted widespread attention due to its low cost and complete planar circuit structure. As a new type of planar waveguide structure, the substrate integrated waveguide not only has the characteristics of low loss, high power capacity, and adaptability to high-frequency frequency bands of the traditional metal rectangular waveguide, but also overcomes the characteristics of the traditional waveguide structure, which is too large and difficult to process. The structure miniaturization and easy processing and integration are realized. [0003] The substrate-integrated waveguide is a waveguide struct...

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Problems solved by technology

[0007] 2. For SIW-based transmission lines, the conduction characteristics such as cut-off frequency and propagation phase velocity are only related to the substrate material and SIW equivalent width

Once the substrate material selection and waveguide size are limited, its conduction characteristics cannot be adjusted twice, and the design freedom is low

[0008] Similarly, many microwave devices based on SIW and HMSIW, such as couplers, also have problems such as large physical size and low degree of design freedom

In addition, the SIW-based coupler has a single coupling structure and lacks design variables to effectively control the coupling coefficient, which has also become one of the bottlenecks in coupler design.

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