Transmission improvement of UMTS and Wi-Fi signals through energy saving glass using FSS

This paper presents a dual-bandpass (DBP) frequency selective surface (FSS) based on hard-coating energy saving glass (ESG). The objective of this study is to generate a novel design of FSS on ESG, which is to be used for future energy smart buildings at Edith Cowan University (ECU). The ESG is made of a transparent coating of conducting layer on glass substrate, which attenuates infrared (IR) radiations for energy saving purpose. However the coating also attenuates useful UMTS and Wi-Fi signals which are necessary for the communication systems within the University. FSS technique is used to improve transmission of RF/MW signals through ESG by generating an array of patterns in the hard coating layer. The design of the DBP-FSS presented here has achieved transmission requirements for two specific frequency bands, with stable frequency response for both transverse electric (TE) and transverse magnetic (TM) polarization at normal and oblique incidence angles up to 60°. The double square loop (DSL)-FSS sustains 92.7% efficiency of ESG by attenuating IR radiations. This design methodology can be adapted as a general reference, which is suitable for applications under similar circumstances. Optimized design and theoretical results are presented.