Single-layer dual-frequency reflectarray

The design and first experimental results for a single-layer, dual-frequency reflectarray for arbitrary polarization is presented. The underlying reflector element is a double square ring structure where the inner ring is folded to cover all necessary phase angles at two frequencies individually. In this work, an antenna for the VSAT frequencies of 20GHz and 30 GHz has been taken as an example. With a 150 mm × 150 mm large reflector, beamwidths of 5.6° and 3.8° have been realized in the 20 GHz and 30 GHz range, respectively.