Parameter Optimization of Frequency Selective Surfaces Made of Composite Materials

Year 2021, Volume: 25 Issue: 2, 357 - 363, 15.04.2021

Abdullah Oğuz Kızılçay

https://doi.org/10.16984/saufenbilder.817605

Abstract

Debye model is used for approximating the frequency dependent complex effective permittivity of the composite structures in filter and shielding applications at microwave frequencies. In debye model, desired shielding effectiveness (SE) is obtained by determining the Debye parameters using trial and error method. But this may result in wasting time or not converging to an optimum solution. In this work to overcome this problem Debye parameters were optimized by using Differential Evolution (DE) algorithm. A Maxwell Garnett (MG) mixing rule was applied to these optimized parameters to obtain frequency selective surface (FSS) parameters. 12dB shielding threshold was chosen between 0.05 – 5GHz frequency range. In accordance with the obtained parameters of FSS, a structure was designed in CST simulation software and simulations had been conducted to obtain SE results. It was seen that the results obtained from analytical computations agree with those obtained from simulations.

Keywords

frequency selective surface, debye model, composite material, differential evolution algorithm

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