Research Title
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A Low Profile Planar Dual-Polarized Tightly Coupled Dipole Reflectarray With 5:1 Bandwidth
This work introduces an extremely low profile ( 0.4λhigh ) 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 18×18 element ( 135×135 mm) reflectarray is designed, fabricated, and measured. The measurements exhibit excellent agreement with the simulations.
M. Hamza, C. L. Zekios and S. V. Georgakopoulos, “A Low Profile Planar Dual-Polarized Tightly Coupled Dipole Reflectarray With 5:1 Bandwidth,” in IEEE Open Journal of Antennas and Propagation, vol. 3, pp. 958-969, 2022, doi: 10.1109/OJAP.2022.3198468.