Experimental verification of waveguide-mode resonant transmission filters

A guided-mode resonance transmission filter is demonstrated experimentally. A five-layer fiberglass/air structure with a waveguide-grating in the center layer is designed, fabricated, and tested. A close match between theoretical and experimental spectral characteristics is found over the spectral range of 4-20 GHz. Guided-mode resonance transmission peaks occur at frequency locations which are in excellent agreement with theoretical predictions.