Design of a novel dielectric resonator antenna using MgTiO3–CoTiO3 for wideband applications

• A wideband antenna was designed and studied both theoretically and experimentally.
• Systematic analysis was performed to optimize sector angular size and permittivity.
• Maximum impedance bandwidth was observed when the sector size was kept at 90°.
• Multi-permittivity cylindrical resonator was fabricated from MgTiO3–CoTiO3 ceramics.
• Impedance bandwidth up to 56% with stable broadside radiation pattern was achieved.

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 (θ) 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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