Analysis of U-slot-excited dielectric resonator antennas with a backing cavity

The U-slot-excited dielectric resonator antenna (DRA) with a backing cavity is analysed theoretically and experimentally. It is found that the U-slot can be used to enhance the impedance bandwidth or to produce circularly polarised (CP) fields. By solving the equivalent magnetic current in the slot using the method of moments, the return loss, axial ratio and radiation pattern are obtained. The effects of changing the U-slot parameters on the antenna characteristics are investigated