The one-step stair-shaped dielectric resonator antennas (DRAs)with a circular cross-section are studied theoretically and experimentally in this paper. The reasons why the one-step stair-shaped DRA shave a wideband performance have been investigated. It is shown in this paper that the modes excited in the one-step stair-shaped DRA with circular cross-section can be regarded as pseudo HEM111 and pseudo HEM113 modes. The pseudo HEM111/ HEM113 mode exhibits similar radiation patterns but a different resonant frequency and radiation Q factor to the HEM111/ HEM113 mode of the cylindrical DRA. By properly choosing the dimensions of the one-step stair-shaped DRA, the two modes can be used to obtain a wideband antenna.
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