Design and Experimental Verification of Compact Frequency-Selective Surface With Quasi-Elliptic Bandpass Response

TLDR

Single SIW cavity frequency‑selective surfaces have been extensively studied, with analytical formulas developed to predict resonant frequencies. The paper presents a compact FSS with a quasi‑elliptic bandpass response. The authors realize the FSS by vertically cascading substrate integrated waveguide cavities, employing cross‑coupling from cascading cavity and dual‑mode filter theories, and fabricate a Ka‑band PCB sample for experimental validation. Experiments show two resonances are excited, the measured response matches predictions, and the quasi‑elliptic FSS offers high selectivity, stable performance, and reduced volume.

Abstract

A compact frequency-selective surface (FSS) having a quasi-elliptic bandpass response is presented in this paper. This was realized by vertically cascading substrate integrated waveguide (SIW) cavities. A single SIW cavity FSS has been fully studied and approximate analytical formulas are introduced to calculate its resonant frequencies. Two different resonances can be excited by a plane wave in the single SIW cavity FSS. According to theories of the cascading cavity filter and dual-mode filter, cross coupling can be realized in cascading SIW cavity FSSs, thus a compact FSS with a quasi-elliptic bandpass response is implemented. A Ka-band sample was fabricated by a printed circuit board (PCB) process. Experiments were carried out to validate this design method. Measured results are in agreement with predicted ones. The proposed quasi-elliptic FSS presents a number of advantages, namely, high selectivity, stable performance, and much reduced volume.