Bandwidth enhancement of stacked dielectric resonator antennas excited
by a coaxial probe: an experimental and numerical investigation
IET MICROWAVES ANTENNAS & PROPAGATION, 2 (6):
580-587 (2008)DOI: 10.1049/iet-map:20070292
Abstract
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 HEM11 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 (tau(f))
was also measured for CRFO and FCTO ceramics.