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.