Traditional Frequency Selective Surface versus Substrate Integrated Waveguide Frequency Selective Surface

I El-Mongy,A M M A Allam

doi:10.13189/ujcn.2014.020302

Abstract

This paper is devoted to analysis design and fabrication of both traditional and substrate integrated waveguide (SIW) frequency selective surfaces (FSS) of square elements and square lattice. The transmission loss is studied for different angle of incidence; normal, thirty, forty five and sixty degrees. Moreover the common band for different angle of incidence is determined. The FSS is fabricated on Rogers RO4350 (lossy) of relative permittivity 3.33, thickness 1.524mm and loss tangent 0.004. The arrays provide different resonance due to different current modes. It is simulated using CST MWS and measured using the network analyzer. There is a good agreement between the transmission loss of both the simulated and measured results.

Highlights

Traditional frequency selective surface has several applications such as polarizers, space filters, subreflectors in dual frequency antennas and as radomes for radar cross section (RCS) controlling [1]
It is easy to fabricate single layer frequency selective surfaces (FSS) formed by periodic patch arrays or slot arrays of simple elements backed by a supporting dielectric layer, but limited in their performance in terms of tendency to be affected to changes of polarization and sensitivity of incident angles [2,3,4,5,6,7,8,9,10]
This article presents a design of a bandpass FSS using substrate integrated waveguide (SIW) technique which is expected to be different from conventional FSS having two main resonant modes; the resonant generated by periodicity and the resonance generated by the SIW cavity

Summary

Introduction

Traditional frequency selective surface has several applications such as polarizers, space filters, subreflectors in dual frequency antennas and as radomes for radar cross section (RCS) controlling [1]. It is easy to fabricate single layer FSS formed by periodic patch arrays or slot arrays of simple elements backed by a supporting dielectric layer, but limited in their performance in terms of tendency to be affected to changes of polarization and sensitivity of incident angles [2,3,4,5,6,7,8,9,10]. Several techniques have been taken to improve the performance of FSS, such as Dielectric loading FSS and biplanar FSS have been studied by Leubber and Munk [2 and 3]. This article presents a design of a bandpass FSS using SIW technique which is expected to be different from conventional FSS having two main resonant modes; the resonant generated by periodicity and the resonance generated by the SIW cavity

SIW FSS

Traditional FSS

Measured Results

Conclusion