Bandwidth enhancement of stacked dielectric resonator antennas excited by a coaxial probe: an experimental and numerical investigation

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Bandwidth enhancement of stacked dielectric resonator antennas excited by a coaxial probe: an experimental and numerical investigation

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An experimental and numerical investigation about bandwidth enhancement of dielectric resonator antennas (DRAs) using multiple DRAs, arranged according to a ‘stacked’ configuration is reported. The antenna consists of two cylindrical discs of the dielectrics Cr0.75Fe1.25O3 (CRFO) and Fe0.5Cu0.75Ti0.75O3 (FCTO) stacked vertically, placed above a ground plane and excited by a coaxial probe. The lateral edge of the cylinder should be placed against the feed probe, which excites the ${\rm HEM}_{11{\rm \delta}}$ mode. The numerical procedure is performed through a software package based on the finite-element method. An excellent agreement between theoretical and experimental results is observed. The concept of increasing the bandwidth of the DRA by stacking is verified. For the first time, the temperature coefficient of resonant frequency (τf) was also measured for CRFO and FCTO ceramics.

Inspec keywords: iron compounds; copper compounds; chromium compounds; antenna feeds; dielectric resonator antennas; finite element analysis; antenna arrays

Other keywords: Cr0.75Fe1.25O3; temperature coefficient; bandwidth enhancement; CRFO ceramics; multiple DRA; software package; coaxial probe; FCTO ceramics; antenna feed; Fe0.5Cu0.75Ti0.75O3; finite-element method; resonant frequency; stacked dielectric resonator antenna

Subjects: Finite element analysis; Antenna arrays; Antenna accessories

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