Hoboken: John Wiley & Sons.) - or absorber screens for electromagnetic energy ( Engheta 2002 Engheta N (2002) Thin absorbing screens using metamaterial surfaces. Other applications involve dichroic reflectors - where two different frequency signals share the same reflector structure, and the FSS is opaque to one band but transparent to the other ( Munk 2000 Munk BA (2000) Frequency selective surfaces theory and design. They have several different applications one of the most famous is in radomes - a cover placed to protect an antenna ( Kraus and Marhefka 2002 Kraus JD, Marhefka RJ (2002) Antennas for all applications. Given the quarter-wavelength distance associated to the structure, it has an inherent narrow bandwidth performance, alleviated by some loading techniques and further geometrical variations ( Abdelaziz 2008 Abdelaziz A (2008) A novel technique for improving the performance of Salisbury screen.
1985 Knott EF, Schaffer JF, Tuley MT (1985) Radar cross section. They can be seen as an evolution from Salisbury screens, a primitive spatial filter these screens consist of electromagnetic radiation absorbing material layer backed by a metallic plate positioned at a quarter-wavelength distance ( Knott et al.
FSSs can be seen as filters that operate on free-space waves, in contrast to lumped or distributed filters that are based on guided waves or transmission lines. A Frequency Selective Surface (FSS) possesses electromagnetic transmission properties that vary with frequency ( Kraus and Marhefka 2002 Kraus JD, Marhefka RJ (2002) Antennas for all applications.
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