This paper is presented to provide an overview on frequency selective surfaces and techniques to achieve tune-ability in frequency selective surface (FSS). FSS array element with specific arrangement on the dielectric surface either transmits (pass-band) or reflects (stop-band) partially or completely with resonance of the structure in tune with the frequency of electromagnetic wave. Tuning devices like PIN or Varactor incorporated in the structure tune the performance. The recent researches on FSS structures classifying them into structural classification and mechanisms to change the operating resonance frequency dynamically by changing the bias of the tuning devices like PIN or Varactor diode have been studied and detailed in this review article. Tune-ability allows the FSS layer filter to adapt to spectral changes and to compensate for the best performance in terms of bandwidth, gain, and directivity. We also focused important performance parameters, particularly on how development in this field could facilitate invention in advanced electromagnetics.
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