Dual-mode dielectric resonator antenna design with stub-loaded feeding slot

A dual-mode dielectric resonator antenna based on a microstrip line-slot coupling feed, operating in both the GMS-900 and GMS-1800 frequency bands, is presented. The antenna structure consists of a rectangular dielectric substrate and a cylindrical dielectric resonator, which is fed by a microstrip line-slot coupling. The cylindrical resonant cavity and the dual-stub coupling slot are designed so that the HEM111 and HEM311 modes are excited simultaneously, resulting in resonance at the two desired frequency points. The gain of the antenna is 3.74 and 7.63 dBi at 0.9 and 1.8 GHz respectively, and the efficiency of the antenna is greater than 70% in both operating bands. Cylindrical resonant cavity, dielectric resonator antenna, dual-mode image