Polarization independent frequency selective surface for marine and air traffic radar applications

Abstract

This article presents a polarization independent frequency selective Surface (FSS) with pass band characteristics for the ‘S’ (1.45–4.63 GHz.) and the ‘X’ (6.33–12.15 GHz) band. The proposed FSS has a miniaturized unit cell structure with optimized dimensions of 13 ×13×1.605 mm³ that is imprinted on a commercially available FR4 substrate. Four stubs each of length 0.115 λ interleaved at the centre of each inner loop to achieve the required pass band performance. Since it is a symmetric structure, it gives a polarization independent performance for the pass band response (for S and X bands) with both TE and TM modes of operation. The AR bandwidth (< 3 dB) for the ‘S’ and ‘X’ bands is 3.2 GHz and 5.82 GHz, respectively. The prototype of the proposed FSS is fabricated and tested using Agilent’s E 5063A a two port vector network analyser and two horn antennas with a calibrated gain of 12 dBi each (operating from 20 KHz to 20 GHz). The measured transmission parameters of the FSS that match well with the simulated ones allow its practical applicability for filtering out unwanted signals for the communication satellites, surface ship radars and metrological satellites used in the ‘S’ and ‘X’ wireless communication bands respectively. It finds practical applicability in filtering out unwanted signals for the communication satellites, surface ship radars and metrological satellites used in the ‘S’ and ‘X’ wireless communication bands respectively.