Abstract
In this article is present the structural and dielectric microwave
properties of Alumina - CaTiO3 ceramic composite with the addition of
CaTiO3 and your performance as a dielectric resonator antenna (DRA).
Alumina has a negative temperature variation of resonant frequency
coefficient (f), while CaTiO3 has a high positive temperature
coefficient. Also influence of calcium titanate on densification and
porosity of the composite is presented. The CaTiO3 was added (2.5% to
10% wt. amount) in order to analyze changes in the dielectric
properties. Samples were characterized by X-ray diffraction. Dielectric
properties were investigated by Hakki-Coleman methods and the
experimental characteristics parameters like return loss, bandwidth, and
input impedance are presented and compared with numerical simulations.
The results obtained shows the formation of secondary phases (Hibonite
and TiO2), with the dielectric permittivity and dielectric loss
increasing and decreasing with calcium titanate concentration,
respectively. The application of DRA was verified and all samples tested
presented return loss below -10 dB in the resonant frequency. (c) 2015
Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:963-969, 2015
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