Stopband Frequency Selective Surface With Ultra-Large Angle of Incidence

In this letter, a stopband frequency selective surface (FSS) with great incident angle independence and polarization stability is proposed and fabricated. Each element of the FSS consists of a cross spiral patch and four same second iteration of H-shaped fractal parts in C4 rotation symmetry. This FSS exhibits great stability with the incident angle ranging from 0° to 80° for both TE and TM polarizations. In addition, patch dimension of the FSS element can tune the resonant frequency. However it has a negligible influence on incident angle independence and polarization stability. This means the proposed FSS can be applied in different frequency ranges and has potential values in practical applications. Both simulation and measurement of this FSS demonstrate stable transmission characteristics under different incident angles and polarizations and show satisfactory consistence.