Abstract
The solid state procedure was used to produce bulk ceramics of BTO
(BaTiO3), CCTO (CaCu3Ti4O12) and BTO0.5-CCTO0.5 that were studied in the
medium-frequency (MF) range (100 Hz-1 MHz) and in the microwave range of
frequencies. The presence of BTO is decreasing the dielectric constant
(epsilon(r)) of the BTO-CCTO composite. The CCTO and BTO samples present
a strong tendency to the increase of the loss with frequency. The BTO
substrates are presenting higher values of the epsilon(r) in the range
of 1-4 GHz (around 140). For pure CCTO the dielectric constant is around
37.6. Similar behaviour observed at the MF range, that the higher
dielectric constant is also associated to the higher loss is also
present in the microwave region. The study of a planar microstrip
antenna, that uses the BTO (X) -CCTO(1-X) ceramic as a high epsilon(r)
substrate was done. Therefore, these measurements confirm the potential
use of such materials for small high dielectric planar antennas (HDA).
These materials are also very promising for capacitor applications and
certainly for microelectronics, microwave devices (cell mobile phones
for example), where the miniaturization of the devices is crucial.
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