Engineering design study demonstrates dual-frequency excitation in a hemispherical dielectric resonator antenna, highlighting a compact feeding approach for multi-band wireless systems.
A new feed structure for dielectric resonator antennas (DRAs) is proposed in order to achieve dual-frequency operation. This structure is composed of two ring slots etched on the ground plane, and one of them is fed by a gap source. By adjusting the structure parameters, the ring slots can excite the DRA to operate at dual frequencies. A hemispherical DRA is considered and the obtained results verify the proposed design.
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Denidni et al. (2005) studied this question.
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