Design of a FSS Bandpass Filter for C-Band Application with Equivalent Circuit Model

In this paper, a frequency selective surface (FSS) configuration has been reported which behaves as a bandpass filter in C-band. The structure consists of a couple of metallic square loops designed over both sides of FR-4 dielectric as its unit cell. The simulation of the structure yields a −10 dB transmission bandwidth of 2.35 GHz with reflection coefficient achieving minima at 6.58 GHz. The field plots have been studied at 6.58 GHz to determine an equivalent circuit model of the proposed bandpass filter. The proposed equivalent circuit model has been simulated and it has been found that the results from equivalent circuit model and full wave simulation are in good agreement.