Methods to improve 5G signal transmittance in modern buildings

Abstract Modern buildings increasingly use low-emissivity (low-e) energy-efficient glass to achieve thermal insulation and reduce energy consumption. However, the low-e coating in energy-efficient glass also leads to high attenuation of wireless signals in the microwave frequency range (-25dB to -30dB), severely impacting the use of indoor wireless communication devices. In this paper, we investigate the use of Frequency Selective Surfaces (FSS) to address the indoor high attenuation issue of wireless signals. Through the transmission matrix method, we calculate the transmittance and reflectance coefficients of energy-efficient glass to optimize the unit structure of FSS, achieving enhanced indoor propagation of 5G high-frequency signals with dual polarization, wide-angle, and high transparency. The performance of FSS is verified through simulation and experimental validation. Without affecting the thermal insulation properties of energy-efficient glass, the signal attenuation in the sub-6G frequency range is reduced by 20-30dB, significantly improving the communication quality of 5G signals in modern building interiors.