Abstract
This letter presents a novel ultrawideband polarization-selective reflectarray with true-time delay. The reflectarray element can be perceived as a combination of a polarization grid and Vivaldi antenna, so is characterized by large bandwidth, low cross polarization, and polarization selectivity. A reflectarray using these elements arranged in a 41 × 41 square grid operating from 6 to 32 GHz is designed, fabricated, and tested. The feed is provided by four pyramidal horn antennas operating at the working frequency (C, X, Ku/K, and Ka bands). In measurements, the reflectarray shows stable radiation patterns from 6 to 32 GHz (more than 5:1 frequency range) and has a maximum aperture efficiency of 40%. It also has the low cross polarization below −28 dB across the entire band and has the characteristic of polarization selectivity.
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