Doubly curved reflectarray for dual-band multiple spot beam communication satellites
The design, manufacturing, and testing of a 0.65-meters doubly curved polarization selective reflectarray for dual-band multiple spot beam communication satellites in Kaband is presented. The configuration is based on a single-offset reflectarray consisting of rotated split hexagonal-loop dipole elements printed on a single-layer substrate. For RHCP, the reflectarray scans the reflected beam half a beamwidth in one direction, and for LHCP, the reflectarray scans the reflected beam half a beamwidth in the opposite direction. This is achieved in both Tx (17.7-20.2 GHz) and Rx (27.5-29.3 GHz) frequency bands. Using a feeding array with 22 feeds, 41 beams over the Earth can be generated, permitting to cover the entire Earth coverage from a geostationary satellite employing the 4-color frequency/polarization re-use scheme using only two reflectarrays while maintaining single-feed-per-beam operation. The reflectarray has been manufactured and measured, and an excellent agreement between simulated and measured patterns is obtained, thus validating the proposed concept.
Publication: IEEE Transactions on Antennas and PropagationDownload PDF