Mobile-friendly Glass – comparing solutions from the end user viewpoint

Energy-efficient coated glass highly attenuates wireless signals, and this has increasingly become a problem in the deployment of reliable wireless networks. On the eve of the fifth generation of cellular wireless (5G), signal attenuation by low-E glasses is becoming a limiting factor for the full potential of the new technologies. Poor indoor connectivity is also familiar issue for the existing network technologies. Different solutions have been proposed. Two-dimensional bandpass filters, i.e. frequency-selective-surfaces (FSS) have been a go-to-solution for the glass industry. In said filters, a periodic lattice of repeating grid patterns have been etched or ablated on the electrically conductive coating layers. In this paper different glass-based solutions are compared through simulations and measurements, and the implications of differences between technologies are explained. In this paper, the scattering patterns of different passive technologies are presented and their practical effects are discussed. Furthermore, the benefits of beamforming with glass-based antennas are discussed, and also the feature of controlling the flow of electromagnetic energy through coating layers is issued. Practical rules of thumbs for architects and designers are presented and path for further studies is outlined.