Enhancing beam congruence on orthogonally polarized Tx/Rx offset antenna systems using reflectarrays
In many space applications, single offset reflectors operating in orthogonal circular polarization in Tx/Rx are required. For these applications, beam congruence in Tx/Rx is desired to ensure optimal performance over the service area. Several factors contribute to beam incongruence, e.g., different electrical aperture sizes in Tx/Rx and beam squint. This paper presents the use of curved reflectarrays to enhance beam congruence in orthogonally polarized Tx/Rx offset antenna systems. The proposed concept combines the capabilities of the reflectarray and a paraboloidal surface, enabling the antenna to compensate the beam in the Rx band without affecting the beam in the Tx band, resulting in congruent beams in Tx and Rx. Preliminary results are presented which demonstrate the proposed concept.
Publication: EuCAP 2018
Place: London, United KingdomDownload PDF