ABSTRACT
Frequency selective surface (FSS) is a type of spatial filter, which offer transmission and reflection characteristics by modifying the electromagnetic incident wave striking its surface. This chapter presents the basic concepts and principle of operation of the FSS. It discusses various types and techniques on the current state-of-art in the field of FSS and the applications of the FSS related to the antennas and summarizes the advantages and disadvantages of the FSS with future scope. The chapter also discusses the classification of FSS on the basis of FSS elements, design structure, and applications. On the basis of structure, FSS is classified into three categories, i.e., single-layer FSS, multilayer FSS, and three-dimensional FSS. Antennas or radar systems are vulnerable to the physical environment; consequently, the performance gets affected when exposed to the outer world. The most famous applications of the FSS are reconfigurable antennas, isolation in multiple-input multiple-output antennas, controlling radar cross section, and antenna radomes.
