One-dimensional truncation effects on planar FSS arrays

Computational analysis on finite frequency selective surfaces (FSS)was carried based on mutual admittance approach. Changes of magnetic current distribution, scattering patterns and transmission characteristics and influences of some parameters, such as the number of element columns and incidence angle, were investigated when the slot arrays were truncated. Compared with the infinite planar arrays, truncation leads to fluctuation of magnetic current distribution, excitation of surface waves at some frequencies, wider scattering pattern beam and higher sidelobe level, and the transmission coefficient would change. Only the resonant frequency and transmission bandwidth are close to those of the infinite planar arrays.