Dielectric characterisation and numerical investigation of SrBi2Nb2O9-Bi2O3 composites for applications in microwave range

• Published in: Journal of electromagnetic waves and applications Vol. 34; no. 12; pp. 1705 - 1718
• Main Authors: Abreu, R. F., Saturno, S. O., do Nascimento, J. P. C., Sancho, E. O., de Morais, J. E. V., Sales, J. C., Gouveia, D. X., de Andrade, H. D., Queiroz Júnior, I. S., Sombra, A. S. B.
• Format: Journal Article
• Language: English
• Published: Taylor & Francis 12.08.2020
• Subjects: dielectric resonator antennas; microwaves; solid-state reaction; SrBi
• ISSN: 0920-5071; 1569-3937
• DOI: 10.1080/09205071.2020.1787231

We present a study of the dielectric properties and behaviour of dielectric resonator antennas (DRAs) based on SrBi 2 Nb 2 O 9 (SBN)-Bi 2 O 3 composites. X-ray diffraction is used for structural characterisation of the samples and it indicates the formation of a new phase after the addition of Bi 2 O 3 . The temperature coefficient of resonant frequency (τ f ) is measured and the results demonstrate that the increment of Bi 2 O 3 improves the thermal stability of the composites from −345.62 to −235.02 ppm/°C. For the dielectric properties, it is observed that Bi 2 O 3 additions cause the formation of new phases, which present higher dielectric ϵ' than SBN. Our numerical simulations show that the materials operate as DRAs and that SBN-Bi 2 O 3 composites could be potential candidates for DRAs operating in the S band.