Miniaturized Filters Based on SIW Quasi-Lumped Elements

摘要

The modeling and design procedure of in-line bandpass filters based on quasi-lumped SIW resonators is presented in this paper. A shunt parallel resonator is implemented by a gap-isolated rectangular patch shorted to ground by means of a via hole. The structure is then embedded into post-wall SIW line, and the proposed resonator can be modeled at circuital level as a quasi-lumped section of a vertically integrated shorted stripline including a capacitive loading at one end. A 3- pole filter centered at 10 GHz with 7% FBW is designed showing very low losses and a huge degree of miniaturization.