A Design Method of Ridge Substrate Integrated Waveguide

Abstract

The invention discloses a design method of a ridge substrate integrated waveguide, belongs to the field of microwave passive devices, and specifically relates to a design method of RSIW. Constructed by embedding a non-full-height cuboidal metal ridge in the longitudinal centerline of the SIW or hollowing out the ridge in the SIW structure and covering the exposed outer surface with metal. The cuboid metal ridge constitutes the path of the intermediate current, which has little influence on the SIW standing wave, and effectively binds the electric field and magnetic field in the center of the RSIW, reduces the cutoff frequency of the main mode and increases the cutoff frequency of the secondary high mode, and expands the Single-mode bandwidth.

Description

technical field [0001] The invention belongs to the field of microwave passive devices, and in particular relates to a design method of RSIW. Background technique [0002] Substrate integrated waveguide (SIW) is a new type of waveguide structure proposed in the 1990s. Its basic structure is that the upper and lower sides of the low-loss dielectric substrate are covered with metal copper, and the side of the substrate is metallized through hole array. SIW has the advantages of both metal waveguides and microstrip lines, and can be fabricated through existing PCB or LTCC processes. Therefore, more and more attention has been paid to the research and development of microwave and millimeter wave communication devices and systems. [0003] In addition to developing SIW applications in various fields, research on SIW structures has also been ongoing. On the one hand, although substrate-integrated waveguides can replace metal waveguides in various microwave active and passive cir...

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Problems solved by technology

[0005] A Ridged Substrate Integrated Waveguide (RSIW) proposed in 2008 is formed by embedding periodic non-full-height metal spines on the longitudinal centerline of the SIW. The bandwidth of the RSIW is 4.9-13.39GHz, with a relative bandwidth of 92.84%. Compared with the SIW without ridge, the bandwidth is increased by 37%. The problem with this structure is that the standing wave is relatively large, and the return loss in the passband is only less than -9dB; an improved structure of ridge substrate integrated waveguide proposed in 2009 passed A non-full-height metal spine is embedded in the longitudinal center of the SIW, and a metal strip is added to the bottom of the metal column. The RSIW works in the Ku band, with a bandwidth of 6.8-25.0GHz and a relative bandwidth of 114.5%. The problem with this structure is the processing more complicated

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