Low emissivity (low-E) windows have thin layers of metallic oxides for extra thermal insulation. These metallic layers not only block infrared and ultraviolet waves but also attenuate cellular signals. Cellular coverage can be improved by using Frequency Selective Surface (FSS) layers that will act as bandpass filters, instead of solid layers.

This paper discusses about the type of FSS structures that can be integrated into the window glass. A workflow process is demonstrated for efficient design and analysis of such structures using Periodic Boundary Conditions (PBC), Characterised Surfaces in conjunction with Ray-Launching Geometrical Optics (RL-GO) method.