Design of Ka-band Reflectarray Antennas for High Resolution SAR Instrument

The design of polarization selective reflectarrays for high resolution and wide swath SAR instrument in Ka-band is presented. The antenna system consists of nine dual-offset reflectarray panels, each with the size of $1.5\mathrm{m} \times0.55\mathrm{m}$. The reflectarrays operate in two modes, a high-resolution mode with a directive beam in one polarization, and a low-resolution mode with a broader beam in the orthogonal polarization. Two designs are presented, a single-layer design and a multilayer design. Both designs provide a gain $\gt 46.7$ dBi for the high-resolution mode and a gain $\gt 45.2$ dBi for the low-resolution mode.