Convoluted loop element for bandpass periodic array

The design and performance of a convoluted FSS loop element is presented. This Maltese-cross look-alike element serves as a potential FSS candidate for antenna operating over the GPS and DCS 1800 frequency band. A common band-pass bandwidth of 22.47% (1.6GHz to 1.95GHz) is obtained with an insertion loss of less than 0.5dB for scan angles up to 45/spl deg/ in both TE and TM polarization. In addition, selective nulling of the transmission response is incorporated in the design of this FSS element for suppressing interference at higher frequency band.