Microwave switchable frequency selective surface with high quality factor resonance and low polarization sensitivity

Victor Dmitriev,Marcelo N Kawakatsu

doi:10.1590/s2179-10742012000200004

Abstract

We present a microwave switchable frequency selective surface with high quality factor transmission resonance. The high quality resonance is achieved by excitation of the trapped-mode in array with two concentric metal rings in a cell on a silicon substrate. Optical activation of the silicon substrate permits to switch off the transmission band.

Highlights

Control of microwave propagation by a boundary surface or a layer is a subject of intense investigation in applied electrodynamics
In this work we propose a switchable FSS with high quality factor (Q-factor) transmission resonance controllable by optical activation of its silicon substrate
NUMERICAL RESULTS For numerical calculation of the reflection and transmission characteristics, we used the wellestablished spectral domain moment method (SDMM) which consists in solving by method of moments the integral equation of the problem in the frequency domain [14]

Summary

INTRODUCTION

Control of microwave propagation by a boundary surface or a layer is a subject of intense investigation in applied electrodynamics. Arrays of patches or aperture elements can have a great versatility of electromagnetic responses Unusual applications of these arrays in microwave region include invisibility metal [1], magnetic mirror [2,3], optical activity [4], thin electromagnetic absorbers [5] and reconfigurable antennas [6]. In this work we propose a switchable FSS with high quality factor (Q-factor) transmission resonance controllable by optical activation of its silicon substrate. This structure can be used in antennas and waveguide technologies, and in electromagnetic compatibility systems, for example, in active filters. The Q-factor of presented FSS is around 8 while that of a similar FSS with a single ring resonant element is around 1 (we define the Q-factor as the ratio between the resonance frequency and the full width at half maximum of transmission)

PROBLEM DESCRIPTION

Reflection

CONCLUSION