Dielectric characterization of BiVO4-TiO2 composites and applications in microwave range

JOURNAL OF ALLOYS AND COMPOUNDS

卷:775

Article

Oliveira, R. G. M.^1,2  de Morais, J. E., V²  Batista, G. S.^1,2  Silva, M. A. S.²  Goes, J. C.²  Sombra, A. S. B.^1,2,3 

[1] Fed Univ Ceara UFC, Telecommun Engn Dept, POB 6007, BR-60755640 Fortaleza, Ceara, Brazil

[2] Univ Fed Ceara, Phys Dept, LOCEM Telecommun & Mat Sci & Engn Lab, POB 6030,Campus PICI, Fortaleza, Ceara, Brazil

[3] State Univ Ceara UECE, Lab Commun & Secur Networks LARCES, Itaperi Campus, Fortaleza, Ceara, Brazil

关键词: BiVO4;    Electroceramic;    Dielectric measurements;    Ceramic composites;    Dielectric resonator antenna;   

DOI  :  10.1016/j.jallcom.2018.10.018

来源: Elsevier

【 摘 要 】

This paper reported the dielectric and structural characterization of composites formed by mixture of BiVO4 and TiO2 and applications in microwave range. The composites were formulated by addition of TiO2 (15, 30, 45 and 60 wt %) in BiVO4. X-Ray Diffraction (XRD) was used in structural characterization. The dielectric properties, temperature coefficient of resonant frequency (tau(f)), dielectric permittivity (epsilon) and dielectric loss (tan delta), were measured and the results confirm that the TiO2 addition improves the thermo-stability of the composites with values varying from -244.03-246.12 ppm.C-0(-1). The dielectric properties varied with TiO2 composition (31 < 67) with dielectric loss around 10(-3) values. These composites were analyzed as Dielectric Resonator Antenna and all samples showed can be applied as antenna (all presented S-11 below -10 dB). The numerical studies of these antennas presented good agreement with experimental results in which the bandwidth, return loss and input impedance had small errors. (C) 2018 Elsevier B.V. All rights reserved.

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