Structural and electrical properties of the SrBi₄Ti₄O₁₅: V₂O₅ matrix in the microwave frequency range

Abstract

In this present work, material has been developed to have thermal stability over microwave range. The SrBi₄Ti₄O₁₅ ceramics are perovskite material from Aurivillius family and were produced by solid state reaction method with temperatures lower than other recent works reported. X-ray diffraction patterns have confirmed single phase and afterward the sample data were refined by using Rietveld method. V₂O₅ was added to the pure specimen with different amounts (5, 10 and 15 wt.%) to possibly enhance electrical and dielectric properties of SrBi₄Ti₄O₁₅. An impedance analyzer and a network analyzer were used to obtain electrical measurements in the range of microwave. Thermal stability measures over a microwave range were used as well as numerical simulations of dielectric resonator antenna (DRA) using the HFSS software. The obtained results have shown an efficient synthesis, and the dielectric constants indicate a real possibility of miniaturization. It was also found that the specimen for 6 wt.% of V₂O₅ presented temperature coefficient (τ _f ) near zero at microwave region. The bandwidths measured from the specimens were classified as S-type with wide bandwidth and it can be applied for meteorological radars and satellite communications.

Keywords:

• SBTi
• microwave
• antennas
• thermal stability

Acknowledgment

The authors are grateful to CAPES, LOCEM Laboratory, X-ray Laboratory and the US Air Force Office of Scientific Research (AFOSR) (FA9550-16-1-0127) for providing financial support.