Bandpass Filter Using SIW Technology in Inductive Window Topology with Low-Cost Substrate FR-4

Abstract

This paper features a step-by-step procedure for designing, simulate, and manufacture a bandpass filter using an inductive window topology within the substrate integrated waveguide (SIW) technology. We have chosen an operating frequency in the microwave range compatible with IoT circuits, employing a dielectric material, the FR-4, which is low cost and widely accessible. Even though it is not the most suitable material for microwave circuits operating above a few gigahertz, we propose to evaluate the challenges it poses on the filter design, in addition to performing a comparison between the results obtained directly from the analytical method, the computational simulations and measured results in the built prototype.

Index Terms
Bandpass filter; SIW; microstrip; FR-4