In order to improve the transmission property of Frequency Selective Surface (FSS) structure,a novel element FSS containing an improved cross element was presented.By applying modal matching approach,the novel element FSS was compared with the traditional cross element FSS theoretically.The influence of the changing angles of TE incidence and the polarizations of large angle incident waves on center frequency was researched.With coating technology and lithography,FSS samples with improved elements were made.The tests were carried out in a microwave darkroom.The measured curve shows a good agreement with the emulated curve.The results show that the traditional cross element FSS can not have angle independence on TE incident waves or polarization independence on large angle incidence,the drift of resonant frequency is 300 MHz for 0～45°TE incidence,and 800 MHz for different polarizations of 45° incident wave;In modified structure,the resonant frequency of FSS remains independent of incident angles,the drift of resonant frequency is only 100 MHz for 0～45° incident wave,also,the resonant frequency maintains the independence for different polarizations.