Polarization and angle independent ultra wideband frequency selective surface design

In this paper, design of a new single layer ultra-wide band (UWB), band-stop frequency selective surface (FSS) with polarization independent and angular stability is presented. The designed FSS consists of a circle-shaped conductive strip and a ring-shaped cross-dipole conductive strip. The unit cell size that forms the UWB-FSY is 0.07 lambda x 0.07 lambda, where lambda is free-space wavelength corresponding to the lowest frequency of the UWB band. The -3 dB bandwidth of proposed FSS is between 3.5 GHz and 11 GHz (at normal incidence) frequencies, which covers the entire UWB band that is defined by The U.S. Federal Communications Commission (FCC). Due to compact size of unit cell, the presented UWB-FSS has good angular stability up to 60 degrees incident angles both perpendicular (TE) and parallel (TM) polarization. The designed UWB-FSS was simulated. Afterall, simulation results was confirmed with the measurements.