The Design And Research On The Frequency Selective Surfaces Broadband Filter

Frequency selective surfaces (FSS) are two—dimensional planar periodic arrays which are composed of one or multi-screen within or without dielectric slabs. FSS behave like spatial filter. Actually, FSS have been widely applied, such as synthesis band-pass FSS used to reduce radar cross section (RCS) of antennas. Furthermore, it is widely applied in most communication systems for spatial band-stop filter. In this thesis, the general description and the some applications of FSS are introduced. The analysis methods of FSS are also presented in detail. Then, some design examples are presented, such as two designs of band-stop frequency selective surfaces (FSS) composed of Jerusalem-cross elements with four additional circular rings. The results show that the Jerusalem-cross with four addition circular rings is a very attractive configuration in the design of FSS. It can provide broad-band and flattop frequency response for filter application. Another broad band-stop frequency selective surfaces (FSS) filter is configured with hexagon array. The spectral domain method of moment (MoM) is selected to analyze the scattering characteristics of FSS array. And the piecewise sinusoidal basis function is the best selection for basis function considering of the slender width hoop of the hexagon. In order to obtain a stability resonant curve under different incidence angles and polarizations, the dielectric slabs arrays are proper added between the FSS screens.