A Transparent Ultra-Wide Stopband Frequency Selective Surface for Millimeter Wave Electromagnetic Shielding

An optically transparent ultra-wide stopband frequency selective surface (FSS) for electromagnetic shielding in millimeter wave is proposed in this paper. The proposed FSS is realized by etching distinctive patterns on non-conductive glass coated with transparent conductive indium tin oxide (ITO). Full-wave electromagnetic simulations demonstrate that the FSS can achieve electromagnetic shielding from 19 to 36.6 GHz with 20 dB shielding effectiveness and exhibit response stability to oblique incidence up to 40° under both TE and TM polarizations. Finally, a prototype is fabricated and the measured results are in good agreement with the simulation.