Terahertz broadband reflectarray with parallel elliptical dipoles

A resonant element consisting of three parallel elliptical dipoles is proposed for the design of a broadband reflectarray at 1 THz. The phase response of the proposed radiating element is reasonably linear and its gradient is constant over a wide frequency range. A subarray composed of 4 radiating elements with a progressive phase change is configured to deflect a normally incident plane wave into a predesigned direction. The numerically simulated field distributions and radiation patterns at different frequencies in the terahertz range demonstrate that the designed reflectarray can perform as expected in a wide frequency band.