Abstract
This paper deals with the design of a compact planar passband frequency selective surface (FSS) operating at the resonance frequency of 20 GHz. A sole layer of the cross type with the interdigital capacitance connecting the corners of metallic patches printed on single side of the substrate is used in this FSS structure. Here the transmission and reflection coefficient of the projected FSS gives an accurate resonance constancy for both of polarization and various incident angles. A unit cell which is mainly a cross shaped is designed here and here the performance of this unit cell at a definite frequency range is analyzed. The S Parameters which are S-11 and S-21 for TE00 mode that is for Perpendicular Polarization is shown in this paper. Along with that the S Parameters which are S-12 and S-22 for TM00 mode that is for Parallel Polarization is also pointed in this paper.