Lossy frequency selective surfaces for gas sensing using ZnO films

Zinc Oxide (ZnO) has emerged as an intriguing material for environmental gas sensing. While many applications of ZnO thin films for gas sensing have been used, this paper proposes a novel technique in which ZnO thin films are patterned to form a lossy frequency selective surface (FSS). When the resistance of the ZnO changes with exposure to gas, there is a change in the amplitude and resonant frequency of the lossy FSS. A small change in the resonant frequency results in approximately 10 dB of amplitude shift at the original resonant frequency.