Design of Compact SIW Bandpass Filter for GPS Application

In this paper, the design of compact bandpass filter (BPF) based on Substrate Integrated Waveguide (SIW) technique for Global Positioning System (GPS) application is presented. The use of SIW technique in the design of BPF aims to produce the filter size as compact as possible while maintaining the optimum filter performance. There are 2 designs of compact SIW BPF used for performance investigation which have a difference in the physical parameter. Both proposed compact SIW BPFs are deployed on 2 layers of 1.6mm thick FR4 epoxy dielectric substrate. In order to acquire a narrow bandwidth response of SIW BPF, some metallic vias are arranged in middle part of the filter. The characterization results show that the proposed design of compact SIW BPF has the center frequency of 1.575GHz yield the filter suitable for GPS application.