On-chip microstrip patch reflectarray

This paper investigates the radiation characteristics of on-chip microstrip patch reflectarray for 60 GHz system. The proposed reflectarray is fed using on-chip cylindrical dielectric resonator antenna, CDRA placed at a distance 42.5 mm from the array aperture. The antenna introduces good impedance matching at 61 GHz. The impedance bandwidth is 1.35 GHz. The reflectarray consists of 289 unit-cell elements covering an area of 42.5 × 42.5 mm2 in x-y plane. Each unit-cell element consists of a square microstrip patch surrounded by four rectangular strips. The phase of the reflected plane wave from the unit-cell element is controlled by varying the patch length. The reflectarray structure and the CDRA are simulated using full wave simulation, finite integration technique, FIT. A maximum gain if 17.5 dBi is achieved and 2.85 % bandwidth is obtained. Offset beams scanning in different directions are investigated.