Wideband and High-Efficiency Circularly Polarized Unit-Cell for X and Ka-Band Transmitarrays - Archive ouverte HAL
Article Dans Une Revue IEEE Open Journal of Antennas and Propagation Année : 2024

Wideband and High-Efficiency Circularly Polarized Unit-Cell for X and Ka-Band Transmitarrays

Résumé

This paper presents a novel approach for linear to circular polarization (LP-CP) conversion in transmitarray antennas. The proposed conversion mechanism differs significantly from previous published realizations. The concept utilizes a transmission line modeling-based excitation technique, in which a centralized via excitation is split into two striplines carefully designed to balance excitations and guarantee a phase quadrature. The striplines are embedded at the center of the patch antenna allowing a compact footprint and a simple design structure. The applied true-time delay (TTD) technique assures the radiation of a wideband and low axial ratio circularly polarized (CP) field. To optimize bandwidth and transmission efficiency, a stacked patch configuration is also employed, allowing for simultaneous high polarization conversion and transmission efficiency. The unit-cell design methodology is detailed, and two transmitarray designs are realized in both X and Ka bands. Experimental results from a fabricated X-band 20 × 20 cell array prototype demonstrate a peak aperture efficiency of 30%, accompanied by a simultaneous 16% -1 dB gain and 1 dB axial ratio bandwidths. Furthermore, the measured wideband and highly efficient Ka-band transmitarray with a 70×70 cell array confirmed a remarkable gain of 39.8 dB and 55% aperture efficiency at 29 GHz, surpassing previous LP-CP transmitarray antennas, while maintaining axial ratio values below 1 dB in a bandwidth larger than 26%.
Fichier principal
Vignette du fichier
DEMR2024-010.pdf (8.07 Mo) Télécharger le fichier
Origine Fichiers éditeurs autorisés sur une archive ouverte
Licence

Dates et versions

hal-04711898 , version 1 (27-09-2024)

Licence

Identifiants

Citer

Alessandro de Oliveira Cabral Junior, Hamza Kaouach, André Barka. Wideband and High-Efficiency Circularly Polarized Unit-Cell for X and Ka-Band Transmitarrays. IEEE Open Journal of Antennas and Propagation, 2024, 5 (4), pp.1061-1076. ⟨10.1109/OJAP.2024.3409746⟩. ⟨hal-04711898⟩
0 Consultations
0 Téléchargements

Altmetric

Partager

More