Abstract
This paper investigated the microwave dielectric properties through the
Hakki-Coleman method of BiVO4 ceramic matrix, obtained by the
solid-state reaction method, using 8, 16, 24 and 32 wt% of CaTiO3. The
X-ray diffraction (XRD) was used for the structural characterisation of
the crystalline phases present in ceramic before the sinterisation
process. The thermal-stability in microwave range was measured in all
dielectric samples, and the temperature coefficient of resonant
frequency (tau(f)) was found varying from -244.03 ppm degrees C-1 to
-2.7 ppm degrees C-1. The CaTiO3 addition reduced the value of the
dielectric permittivity (epsilon') close to 25% of the BiVO4 values,
keeping the dielectric loss (tan delta) around 10(-3). The experimental
and numerical simulated values of the dielectric resonator antenna (DRA)
results show the agreement of the input impedance, return loss,
bandwidth and radiation patterns. Moreover, all antennae features
realised gain above 5dBi. In antenna results, the CaTiO3 addition
increased the bandwidth, compared to BiVO4 DRA, that presented bandwidth
around 34 MHz.
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