Frequency selective surface with wideband quasi-elliptic bandpass response

A frequency selective surface with a new type of three-dimensional element which produces a quasi-elliptic bandpass response is presented. The element exhibits an elliptic bandpass response with a -3 dB bandwidth (BW/f₀) of ~ 70%, where f₀ is the centre frequency. The design has been adapted to a form that can be conveniently fabricated by utilising printed technology. The measured results for the frequency response show good agreement with those predicted via numerical simulations.