A Low Profile Planar Dual-Polarized Tightly Coupled Dipole Reflectarray With 5:1 Bandwidth

A Low Profile Planar Dual-Polarized Tightly Coupled Dipole Reflectarray With 5:1 Bandwidth

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This work introduces an extremely low profile ( kt196 torque converter $0.4lambda _{high}$ ) 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 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 altitude sunscreen agreement with the simulations.