Investigation of the RCS for a finite bandpass frequency selective surface

Frequency selective surface (FSS) of finite size behaves differently with respect to an ideal infinite one due to the influence of fringe effect. The study on RCS of a finite FSS can quantitatively reveal the mechanism of the fringe effect, while there exist little study concerning this subject. This paper presents study of RCS for FSS with finite structures. The RCS for different sizes of FSS under plane wave illumination are studied. Quantitative relations between fringe effect and dimension of FSS are summarized. A new case is finally picked and tested to verify the validity of the relations.