Numerical Studies of X Band AbFSS Antenna Radome

In this paper, we describes a novel periodical electromagnetic structure. This hybrid structure consists of an absorber layer and a frequency selective surface (FSS) layer, so-called AbFSS structure. These two layers share one dielectric substrate. The absorber layer works at K band and the FSS layer performs at X band. The unit of this structure is numerically studied. A design procedure is developed after this study. Then an AbFSS antenna radome is modelled and applied to a 2x2 microstrip patch array. The characteristics of the array with and without this novel radome are researched. The characteristics include antenna gain and monostatic RCS. The comparisons of these characteristics of the array with and without the radome demonstrate that this radome is transparent at X band and absorptive at K band. This AbFSS structure can be easily achieved in Engineering and be a good candidate for the antenna radome.