Abstract
In this work, BBT has been synthesized by solid-state reaction. X-ray
diffraction and Raman spectroscopy were used to structurally
characterize the samples. The dielectric properties were analyzed by
impedance spectroscopy for radiofrequency range. For microwave range,
the dielectric properties were analyzed by the Hakki-Coleman method. The
properties of a DRA made from BBT were obtained by numerical simulations
and compared with experimental results. The results show that the
synthesis of BBT was effective from 800 degrees C, showing nanosize
particles (35-45 nm) with tetragonal symmetry. Raman spectra exhibited
all active modes characteristic of BBT. The dielectric properties of BBT presented high values of dielectric permittivity (epsilon' = 52.40 for
microwave range and epsilon' > 100 for radiofrequency range). BBT
ceramic based showed negative values of (-422.11 ppm degrees C-1)
temperature coefficient of resonant frequency. The DRA BBT-based
demonstrated the use as an antenna, exhibiting small gain of 1.1 dBi and
efficiency of 32.5%. (C) 2013 Elsevier B.V. All rights reserved.
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