Flat reflectarray that generates adjacent beams by discriminating in dual circular polarization

Abstract

One planar 18x18 cm2 reflectarray prototype, capable of generating adjacent pencil beams with orthogonal circular polarizations (CP) in Ka-band (19.2-20.2GHz), has been designed, manufactured and measured as a proof-of-concept to demonstrate the possibility of beam separation in dual CP applications. The prototype exhibits main beams pointing at elevation angles of 16.7° and 21.3° for left-hand CP and righthand CP respectively. A 1.5dB gain variation and 66efficiency is achieved in the frequency band 19.2-20.2GHz for a design center frequency of 19.7 GHz. These results will be useful for future work involving the design of multi-spot dual CP and dual band planar reflectarrays.