Cross-arranged dielectric resonator antenna with cross slot excitation

A broadband circularly polarized (CP) dielectric resonator antenna (DRA) is investigated in this paper. There are four identical dielectric resonators (DRs) arranged into a cross configuration and excited by a cross slot. A significant enhancement in the axial ratio (AR) bandwidth is found due to their inherited sequential structures, with the antenna has the input impedance bandwidth of 31.2% from 4.06 to 5.56 GHz, and the 3-dB AR bandwidth of 24.2% from 4.24 to 5.41 GHz. Moreover, the presented CP DRA has a compact and low-profile structure. This design demonstrates an idea to widen the AR bandwidth of the CP DRA.