A Nonradiative Dielectric Waveguide Based Wideband Reflectarray Antenna

This paper introduces the design of a reflectarray antenna (RA) based on a nonradiative dielectric (NRD) waveguide. The proposed design achieves wideband performance by eliminating the need for traditional resonant components. Unstable reflection coefficient of the element under oblique incidence is investigated and addresses through a specific feed configuration. The 16×16 RA prototype exhibits a verified capability for maximum collimation beam angles up to 60°, accompanied by a gain variation of under 1.5 dB within the frequency range of 9.5 GHz to 11.5 GHz, with relative low beam squint.