Reflectarrays for Beam Squint Compensation of Orthogonally Polarized TX/RX Offset Antenna Systems
Beam squint in single offset reflector antennas with circularly polarized feeds is well known. For applications where single offset reflectors operate in orthogonal circular polarizations in Tx/Rx, the beams in the two bands squint in opposite directions resulting in incongruent beams in Tx and Rx. This paper presents the use of reflectarrays to compensate for the beam squint in offset antenna systems. The proposed concept combines the phasing capabilities of the reflectarray and a parabolic surface, enabling the antenna to compensate the beam squint in one band without affecting the beam in the other band, resulting in congruent beams in Tx and Rx. Preliminary results are presented which demonstrate the proposed concept.
Publication: 38th ESA Antenna Workshop
Place: ESTEC, Noordwijk, The Netherlands