Frequency-Selective Rasorbers: A View of Frequency-Selective Rasorbers and Their Application in Reducing the Radar Cross Sections of Antennas

A frequency-selective surface (FSS) can be employed as a spatial filter for incident electromagnetic (EM) waves, which are most often used in radome design to protect the antennas and to reduce the radar cross section (RCS) of the antenna system
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. In-band signals transmit through the FSS with little power loss, while out-of-band incoming waves are reflected strongly, making them detectable by radar. Thus, to further reduce the biostatic/multistate RCS of the radome, circuit analog absorbers or absorbing materials are introduced into the radome design. As a result, the out-of-band signals are absorbed and reflection is reduced.