أ.د.خيرية سالم بلغيث2026-11-052026-11-05https://dspace.academy.edu.ly/handle/123456789/2764Used a simple technique of Single-Square-Loop frequency selective surface (SSL-FSS) is proposed. Process of the calculation of various parameters is presented and the numerical technique has been supported by the simulation, effects of parameters of a square loop frequency selective surface to the resonance frequency are studied.The objective of this thesis investigates the assessment of frequency selective surface (FSS) in six cases. In order to meet this objective, we study and represent all cases by equations and equivalent circuits and design by Computer Simulation Technology (CST).microwave studio. Proof the design as low, high, band pass and band stop filter.Analysis and desingn