A novel element Frequency selective surface (FSS) composed of an improved cross element is presented in this paper. By applying modal matching approach

the novel element FSS is compared with the traditional cross element FSS theoretically. The influence on the center frequency for changing angles of TE incidence and polarizations of large angle incident waves is researched. With filming technology and lithography

FSS samples with improved elements are made. The tests are made in the microwave darkroom. The measured curve shows good agreement with the emulated curve. It is shown that the traditional cross element FSS can not have angle independence for TE incident waves or polarization independence for large angle incidence

the drift of the resonant frequency is 300MHz for 45°TE incidence

and 800MHz for different polarizations of 45°incident wave; In our modified structure

the resonant frequency of the FSS remains independent of incident angles

the drift of the resonant is only 100MHz for 45°incident wave

also

the resonant frequency maintain the stabilization for different polarization.