Reflectarray Unit Cell Based on a SIW Cavity Resonator

Abstract

We introduce a novel reflectarray unit cell based on a SIW cavity resonator, designed for operation at 18.7 GHz. It can achieve a full phase cycle of phase shifting and low losses, while keeping manufacturing requirements simple. Furthermore, by relying on a resonant cavity instead of open elements, inter-cell coupling effects are reduced. This can lower the approximation errors resulting from using the cell response under a fully periodic environment during the design process.