A Parallel Plate Waveguide Measurement Technique for Characterizing Frequency Selective Surfaces

Abstract

This paper presents a parallel plate waveguide (PPW) system to characterize frequency selective surfaces (FSSs) in microwave frequencies. The setup includes two metallic sheets placed parallel to each other with a feeding source at each end that provides a wideband impedance matching. The dimensions of the sheet have been varied gradually to minimize the edge radiation effect, whereas the thru-reflect-line (TRL) calibration technique has been carried out for accurate measurement. Three different FSS geometries, one bandstop, one bandpass, and one broadband absorber have been considered, and their scattering parameters have been determined. The responses have been compared with those of the unit cell simulated responses, and good agreement are observed in all cases, thereby validating the effectiveness and accuracy of the proposed PPW system. © 2024 IEEE.