A simple planar single layered frequency selective surface with band-stop and bandpass characteristic

Pass band and stopband frequency selective surface (FSS) structures are extensively applicable in several wireless technologies to pass or stop desired frequency spectrums. A compact single layered frequency selective surface (FSS) with band stops and bandpass characteristic is formed by metal strips of extended Swastika shape on Rogers TMM-4 dielectric with overall periodic component size of 0.19 lambda L x 0.19 lambda L x 0.01 lambda L (lambda L is wavelength at lowest stopband frequency) is reported in this letter that offers polarization independent and certain (up to 45 degrees) angular insensitive characteristics. The FSS experimental analysis offers dual stopband resonances at 5.45 GHz and 16.1 GHz with bandwidth of 30.9% (4.6-6.28 GHz) and 27.66% (13.58-17.94 GHz) where decent association with full wave and circuit simulation results are attained. The FSS also offers passband resonance at 8.1 GHz. Apart from conventional wireless filtering and reflector applications, the FSS is also suitable for EM shielding applications. Further to proof the design concept, the FSS design parameters are upscaled to realize the WiMAX (3.3-3.8 GHz) stopband coverage. The upscaled similar shaped FSS of periodic component size 0.187 lambda L x 0.187 lambda L gives double stopbands at 2.96-4.18 GHz and 9.2-12.04 GHz and passband resonance at 5.6 GHz.