A novel half Hemispherical Dielectric Resonator Antenna with array of slots loaded with a circular metallic patch for wireless applications

In this paper, effect of loading of a circular metallic patch on a half Hemispherical Dielectric Resonator Antenna (HDRA) with array of slots is investigated. The half HDRA with array of slots operate from 5.3 GHz to 6.05 GHz. The circular patch controls the frequency tuning of the antenna geometry. The radius of the patch governs the resonant frequency and subsequently the bandwidth of operation. The patch also plays a role of reflector to improve the gain of the antenna. An optimized radius of patch of r = 0.6 cm on the proposed geometry offers 0.82 GHz of impedance bandwidth (S11 < −10 dB) at 4.55 GHz. The gain is significantly improved to 8.5 dBi at 5.05 GHz. A prototype is fabricated and the measured results are found to be in good agreement with the simulations. The resonant frequency is most suitable for standard wireless communications with wide band and high gain applications.