Wideband Substrate Integrated Differential Dual-Polarized Dielectric Resonator Antenna

TLDR: In this paper , a substrate integrated differential cavity-backed dual-polarized dielectric resonator antenna with a wide bandwidth, low profile, high isolation, and improved gain is presented.

Abstract: A substrate integrated differential cavity-backed dual-polarized dielectric resonator antenna with a wide bandwidth, low profile, high isolation, and improved gain is presented. The proposed substrate integrated technique, in which the electric and magnetic walls of the cross-shaped dielectric resonator antenna (DRA) are realized by arrays of metallic and nonmetallic vias, respectively, provides the design with high level of integration and low profile. The substrate integrated DRA is differentially fed by microstrip lines through coupling slots exciting a pair of orthogonal modes for the dual polarizations. The differential feeding scheme offers a direct connection to differential systems, and greatly improves the isolation between polarizations. Benefitting from the differential coupling slots and the substrate integrated back cavity, the bandwidth is broadened and the realized gain is improved. For demonstration, a prototype is designed and fabricated. The simulated and measured results show a good agreement.