Novel Wideband Bow Tie shaped Hemispherical Dielectric Resonator Antenna

In this paper a novel wideband bow tie shaped Hemispherical Dielectric Resonator Antenna (HDRA) is pre-sented. The simulated results confirms a wide bandwidth of 2.29 GHz (2.69 - 4.98 GHz) ($S_{11}$ ≤ -10 dB is 61 % at 3.7 GHz) with an average gain of 5.5 dBi in the operating frequency band. Here, HDRA is kept complementary to each other to get bow tie shape. It ensures uniform excitation of the mode fields in each DRA element which leads to improvement in bandwidth. The mode investigated is T E111 mode at the first resonant frequency of 3.9 GHz. The effect of increasing the probe length on the resonance and radiation pattern is also investigated. The radiation patterns of antenna are directive in nature and radiation efficiency is more than 95 % in the entire band. The presented antenna is suitable for C band, most of L band and WiMAX applications.