In this paper, a triple-band dual-sense circularly polarized (CP) hybrid dielectric resonator\nantenna is proposed. A modified hexagonal dielectric resonator (DR) is top-loaded with a square\nmicrostrip ring (SMR). A vertical-tapered-strip connected to a 50-ohms microstrip line is used to excite\nthe proposed antenna. It is found that the lower and central CP bands correspond to left-handed\ncircular polarization and are produced by the TM11 and TE111 modes of the SMR and modified\nhexagonal DR, respectively. The upper CP band is formed by the combination of the quasi-TM21\nmode of the SMR and quasi-TE111 mode of the DR that exhibits right-handed circular polarization.\nThe measurement results of the fabricated prototype show triple-band response for |S11| < -10 dB\nwith impedance bandwidths (IBWs) of 17.4% (1.75-2.03 GHz), 28.13% (2.23-2.96 GHz), and 2.97%\n(3.65-3.76 GHz) in the lower, central, and upper bands, respectively. The measured 3 dB axial ratio\nbandwidths lying within -10 dB IBWs are 3.69% (1.86-1.93 GHz), 5.46% (2.670-2.82 GHz), and 2.15%\n(3.68-3.76 GHz) along with the peak gains of 5 dBic, 5.28 dBic, and 2.36 dBic in the lower, central, and\nupper bands, respectively.
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