The Active Way of Tunable Frequency Selective Surfaces

Frequency selective surfaces(FSS) is a topic of several decades and still attracting interests of researchers in many areas. Variation of FSS have been studied by many groups for different applications. Whatever, FSS worked with various types of sources have been paid much more attention for its tenability in frequency, bandwidth, and so on. In this paper, state of the art on tunable FSS with active stimulations was reviewed.