CST – Computer Simulation Technology

Design of a novel dielectric resonator antenna using MgTiO3–CoTiO3 for wideband applications
Ubaid Ullah, Wan Fahmin Faiz Wan Ali, Mohd Fadzil Ain, Nor Muzlifah Mahyuddin, Zainal Arifin Ahmad
MAterials and Design
Vol 85
pp. 396–403
Bandwidth, Multi-sector, MgTiO3, CoTiO3, Dielectric resonator antenna
In this work, a novel low profile design of a cylindrical dielectric resonator (DR) antenna with two different permittivity materials is proposed for wideband applications. The multi-permittivity cylindrical DR (MPCDR) was formed by combining four 90° sectors whereby sectors with the same permittivity were positioned in opposite quadrants. Simulation of the antenna was performed in the time domain using computer simulation technology (CST 2014). A systematic analysis was carried out to optimize the antenna's sector size and permittivity. The prototype was fabricated using MgTiO3 (MTO) and CoTiO3 (CTO) dielectric materials prepared via solid state reaction. MTO and CTO were sintered at 950 °C (4 h) and subsequently analyzed by XRD to confirm the presence of a single phase. The dielectric properties of MTO and CTO were studied by electrical characterization; it was found that MTO and CTO have permittivity values of 15.72 and 9.85, respectively. The antenna performance was analyzed by placing the MPCDR on top of a microstrip line with an angular position (?) of 27.5° with respect to the longitudinal axis of the feed-line. An impedance bandwidth up to 56% with stable broadside radiation pattern was achieved in both the simulation and measured.

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