Investigation of Additive Manufactured Terahertz Dielectric Reflectarray

A 3D printed high-gain terahertz dielectric reflectarray working at 220GHz is presented. The reflectarray unit cell is consist of a ground and a dielectric block. The reflection phase can be obtained by adjusting the height of the block. Using the reflection phase computational algorithm, a side-fed reflectarray composed by 40×40 unit cells is designed at 220GHz and fabricated using 3D printing technology. The HFSS simulation results show the maximum gain of 31.3 dBi with the reflected direction of 25° and the aperture efficiency of 25.4%. Measurement radiation patterns are in good agreement with simulation results.