This work introduces an extremely low profile ( $0.4lambda _{high}$ ) planar ultra-wideband dual-polarized reflectarray.The unit-cell structure of the array is modular in nature, and without any electrical connection between adjacent unit-cells.
The array uses tightly coupled dipoles arranged in an egg-crate fashion connected with true-time-delay lines.This array provides the required phase in the here highest ever reported bandwidth of 5:1 (3 to 15 GHz) with VSWR< 2.5 for a planar reflectarray.
The implementation of the delay-lines is done using a sandwich configuration between two conductive planes, which significantly improves the cross-polarization purity of our reflectarray.To validate our design concept, an $18 imes 18$ element ( $135 imes 135$ mm) reflectarray is designed, fabricated, and measured.The measurements exhibit excellent craggy range sauvignon blanc 2022 agreement with the simulations.