A Review on Frequency Selective Surfaces and its Applications

This article presents the frequency selective surfaces (FSS) and its concepts. Principle of operation of FSS is briefly explained. To understand the physical geometry, equivalent circuit models are discussed. Various applications of FSS are studied. It is observed that the FSS have spatial filtering properties and can be implemented as a bandpass or bandstop filter with least attenuation of 20dB. The miniaturized FSS provides angular stability up to 85°. FSS integrated with MIMO antenna system reduces the mutual coupling effect with ECC less than 5e-6 can be obtained. FSS when integrated with the antenna enhances the gain. FSS also provides better electromagnetic shielding. Apart from these, 3D FSS structures and reconfigurable FSS are also discussed. The latest techniques to implement FSS are outlined. The new advancements in this field are also investigated.