Fractal X-Shaped FSS Employed Electromagnetic Shield for X-band SATCOMs

In this paper, a novel Frequency Selective Surface (FSS) based electromagnetic shield is designed to avoid interference for SATCOMs in X-band. The proposed FSS unit cell is a modified X-shaped geometry and has a band-stop frequency selective behavior. The proposed unit cell has compact dimensions with at least 32 dB attenuation to provide electromagnetic shielding in X-band. Moreover, this FSS based EM-shield achieves a stable frequency response up to 60° for both transverse electric (TE) and the transverse magnetic (TM) polarization. Finite Element Boundary Integral (FEBI) Method, equivalent circuit modeling of the proposed FSS also verify its suitability for SATCOM applications.

I. Introduction

The FSSs attaints the property of resonant structures that are periodic in nature. The array of these periodic structures offers either band-pass or band-stop characteristics owing to their frequency selectivity nature [1]. FSSs are employed in large number of applications including but are not limited to reducing radar cross section (RCS), antenna radomes, electromagnetic interference mitigation [2], wide-band antennas and highly directive antennas [3] employed FSSs as High Impedance Surfaces (HISs), and undesired coupling mitigation UWB-MIMO systems [4], [5]. In most recent developments, many FSS configurations are presented. In [6], a single-layer cross dipole is presented for RCS reduction with limited bandwidth. A flexible Convoluted Ring Loop (CRL) FSS is realized in [7] with limited angular stability. An FSS having dual band response with U-shaped geometry in [8], achieves shielding behavior for both X and Ku-band applications. In [9], a serpentine strip FSS based flexible shield is reported. This flexible FSS shield offers limited shielding effectiveness when flat. However, the reported literature enlightens, narrow band performance, lack of miniaturization, and incidence angular stability are the major constraints.