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INVESTIGATION OF NEW SECTORED HEMISPHERICAL DIELECTRIC RESONATOR ANTENNAS OPERATING AT TM101 AND TE111 MODE FOR CIRCULAR POLARIZATION

—This article discusses the eﬀect of sectorization technique in a hemispherical dielectric resonator antenna (HDRA) for the ﬁrst time with its signiﬁcant eﬀects on electromagnetic modes and various antenna parameters. The sector angle ( β ) forms an additional framework for better optimization of HDRA. The resonance frequency, impedance bandwidth, co-cross polarization characteristics have been investigated in new sectored HDRA geometries excited at their TE 111 and TM 101 modes. Further, examination of circular polarization (CP) is carried out by detuning of degenerate orthogonal modes in HDRAs, and β = 180 ◦ has been particularly examined in details for CP. Based on the results, appropriate values of ‘ β ’ and probe position ( P r ) are chosen followed by modelling a prototype and experimental.