WideBand Dielectric Resonator Antenna at Ultra High Frequency (UHF) Band
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"Dielectric Resonator antennas are widely used because of their low loss, high efficiency, small size and wider bandwidth.Now a days several research institutes make antenna with,low-profile design, wider operational bandwidth, circular polarized radiations, high gain and, modified shape. Recently Hybrid DRA and shaped DRA are developed. In DRAs main characteristic parameters are wider bandwidth and compact in size. In our design stacking technique used. Using these method we get wider bandwidth and small size. In this DRA we use one segment below Dielectric resonator and one more segment above the Dielectric Resonator and triangular part is removed and fill these part with air. In the designing of DRA two stackes are made of materials TMM10 and FR4/Epoxy. one more material used with high Dielectric Constant for midian dielectric. By using conducting plate on the one face of the DRA, size of the antenna is reduce by 50% and we get compact antenna. In our design we get the return loss below 10dB in the frequency range of 0.75 GHz to 1.65 GHz and gain of the DRA is above 0dB in the frequency range of 0.65 GHz to 1.8 GHz and theoretical resonance frequency of the DRA is 1.3 GHz and radiation pattern and beam width approximately 60 degrees."
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