A wideband, low profile and high gain dielectric resonator antenna is investigated in this letter. The antenna consists of two dielectric layers with different permittivities and it is centrally fed by a rectangular slot. By placing the dielectric layer of low permittivity (2.2) below that of high permittivity (15), the antenna with low profile of 0.1λ0can obtain a 10-dB impedance bandwidth of ~ 40% and an average gain of ~ 9 dBi.
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Pan et al. (2015) studied this question.
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