Design of comb reflection frequency selective surface for interference reduction in corridors of buildings

A periodic comb reflection frequency selective surface (CR‐FSS) is presented for reducing interference caused by the propagation of signals via corridors. The novel CR‐FSS has been designed to reduce the power of the forward scattered signal and increase the backscatter. For a specified comb period and angle of incidence, the direct forward scatter of the CR‐FSS can be reduced by 5–15 dB and the backscatter increased by 10–15 dB over a frequency range of 10.8–13.5 GHz for a vertically polarised signal and 10.8–17 GHz for the horizontal polarisation. The CR‐FSS is thus shown to be effective for both vertically and horizontally polarised signals. Comb period and angle of incidence are chosen to satisfy the conditions of Bragg's Law to provide a maximum backscatter at 10.8 GHz. By installing this novel surface in corridors, interference between multiple neighbouring transmitters can be reduced.