A second-order band-pass frequency-selective surface using hexagonal aperture coupled patches: Design and validation

A second-order band-pass frequency selective surface is composed of three layers of periodic elements and two layers of dielectric with stable performances is presented. The outer layers are with hexagonal metallic patches while the middle layer is with hexagonal aperture. A simple lumped element model are derived and presented. A test sample is fabricated and measured to verify the design. This frequency selective surface is not sensitive to polarization and incident angle.