A microstrip-slot coupled Rectangular Dielectric Resonator Antenna (RDRA) operated at the fundamental mode is investigated numerically and experimentally. The effect of slot size on the radiation performance of the RDRA is studied. The antenna structure is simulated using the High Frequency Structure Simulator (HFSS) software package. The simulated results are presented and compared with those obtained by experiments. It is shown that the size of the slot can significantly affect the radiation properties of the RDRA and there are good agreements between numerical and experimental results.

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