Annular Column Loaded Cylindrical Dielectric Resonator Antenna for Wideband Conical Radiation

Abstract

A wideband cylindrical dielectric resonator antenna (CDRA) loaded with an annular column, namely the LCDRA, is proposed and analyzed. The antenna comprises two components an inner cylindrical dielectric and a loaded concentric column dielectric. The proposed antenna is centrally fed by a coaxial probe, and has a low profile of 0.175 λ0 (λ0 is the wavelength of the center frequency). Four conical radiation pattern modes (TM01δ, TM02δ, TM03δ and TM04δ modes) are excited and merged, providing an impedance bandwidth of 56% (3.14~5.56 GHz). A prototype of the proposed antenna is built and tested. Good agreement between the simulated and measured results, including the reflection coefficient and radiation patterns, is achieved. Index Terms-dielectric resonator antennas (DRAs), conical radiation pattern, wideband antennas

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“…In this paper, a new hybrid DRA configuration will be used to increase the impedance bandwidth of the antenna. Compared to earlier studies in the open literature [23][24][25][26][27][28], the proposed configuration results in multiple nearby resonant modes which explain the further substantial bandwidth enhancement. A measured fractional bandwidth about 148.6% (6.8 : 1) is obtained with a consistent monopole like radiation over the operating bandwidth and a peak gain of 7.14 dBi.…”

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“…The first method is to employ the higher-order modes. For instance, a cylindrical DRA loaded with an annular column was studied in [14]. This work successfully merges a fundamental and three higherorder TM modes of the cylindrical DRA, which provides an impedance bandwidth of 56 %.…”

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