1. Magneto-dielectric composite based on Y3Fe5O12 – CaTiO3 for radio frequency and microwave applications.
- Author
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Paiva, D.V.M., Silva, M.A.S., de Oliveira, R.G.M., Rodrigues, A.R., Fechine, L.M.U.D., Sombra, A.S.B., and Fechine, P.B.A.
- Subjects
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YTTRIUM iron garnet , *MAGNETIC properties of iron oxides , *METALLIC composites , *TITANIUM dioxide , *SOLID state physics - Abstract
Abstract Yttrium iron garnet and calcium titanate (Y 3 Fe 5 O 12 -CaTiO 3 , YIG-CTO) ceramic composite were obtained according to the well-established solid-state route. This system was studied by complex impedance spectroscopy as a function of temperature. All samples showed a thermo-activated relaxation with energy activation between 1.10 and 1.70 eV. The CaTi 0.6 Fe 0.4 O 2.8 phase is formed during sintering process, which influences in the electrical behavior of the samples. Nyquist diagrams were adjusted by two equivalent circuits in series to represent electric response. The YIG-CTO system was also used to design a dielectric resonator antenna (DRA) for microwave applications. The results indicate that DRA YIG-CTO-based presented an operation frequency range around 1–7 GHz, and reflection coefficient below −38 dB. From obtained results, the YIG-CTO composite is a great candidate for usage in electronic devices, operating in the C-band, such as WiFi and ISM band applications. Highlights • Composites demonstrate ferrimagnetic behavior due to Y 3 Fe 5 O 12 phase. • Y 3 Fe 5 O 12 –CaTiO 3 composite can be used as Class 1 ceramic capacitors due to its high thermal-stability. • Resonators can be used in C-band applications: satellite communication, Wi-Fi devices and weather radar systems. [ABSTRACT FROM AUTHOR]
- Published
- 2019
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