A Ka-band beam-steering transmitarray achieving dual-circular polarization
Résumé
This contribution describes a versatile and technologically simple approach for the design of polarization-agile beam-steering transmitarray antennas. The array interleaves two types of electronically reconfigurable unit cells which receive the same linear polarization but radiate horizontally and vertically polarized waves, respectively. The phase shift introduced by each cell can be varied with a resolution of about 90° (2-bit phase quantization) controlling the bias state of two pairs of p-in diodes. Dual-linear and dual-circular polarization can be obtained by enforcing the proper phase shift among orthogonally polarized cells. In order to validate this concept, a 24×24 dual-circularly polarized transmitarray is designed for Ka-band satellite communications. The experimental results prove the antenna beam-steering up to 60° and the polarization switching capability. An axial ratio < 1 dB is observed for the broadside beam over the operating band (29.5-31 GHz).
Origine : Fichiers produits par l'(les) auteur(s)