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Evaluation of the Dielectric Properties of CaMoO4‒TiO2 Composites for Microwave Applications Under Temperature Variation

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Abstract

This work presents experimental and numerical investigations of the microwave dielectric properties of the ceramic matrix CaMoO4 (CMO) with the addition of 8, 12, and 20 wt% TiO2, obtained through the solid-state reaction method. X-ray diffraction and Rietveld’s refinement revealed no evidence of secondary phases, indicating no reaction between the CMO and TiO2 phases. The dielectric properties presented an improvement with the addition of TiO2, with the CMO8 sample presenting \(\varepsilon^{\prime}_{r}\) = 12.8, tan δ = 7.8 × 10–4, and τf =  − 6 ppm°C−1, demonstrating that this material has thermal stability (τf < 0). The ceramic was tested as a dielectric resonator antenna (DRA) and numerical simulation results showed that the materials have a realized gain of 4.40–4.92 dBi, a bandwidth of 741‒1079 MHz, and a radiation efficiency above 86%. The results indicate that CMO‒TiO2 systems could be employed in devices operating in the S-band.

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Funding

This work was partly sponsored by the Brazilian Research Agencies CNPq-Conselho Nacional de Desenvolvimento Científico e Tecnológico (Grant INCT NANO(BIO)SIMES), CAPES—Coordenação de Aperfeiçoamento de Pessoal de Ensino Superior (Grant Project PNPD), FINEP-Financiadora de Estudos e Projetos (Grant INFRAPESQ-11 and INFRAPESQ-12), and the U.S. Air Force Office of Scientific Research (AFOSR) (FA9550-16-1-0127).

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Authors and Affiliations

  1. Telecommunication Engineering Department, Federal University of Ceará (UFC), P.O. Box 6007, Fortaleza, CE, 60755-640, Brazil

    Francisco Enilton Alves Nogueira & Roterdan Fernandes Abreu

  2. Department of Organic and Inorganic Chemistry, Federal University of Ceará (UFC), Fortaleza, CE, Brazil

    Tallison Oliveira Abreu, Vitor Carvalho Martins & Felipe Felix do Carmo

  3. Federal Institute of Education, Science and Technology of Ceará, PPGET, Fortaleza, CE, Brazil

    João Paulo Costa do Nascimento

  4. LaMFA - Advanced Functional Materials Laboratory, Central Analítica, Physics Department, Federal University of Ceará - UFC, Fortaleza, CE, 60440-554, Brazil

    Anupama Ghosh

  5. Group Functional Nanomaterials, Physics Department, Federal University of Sergipe, Sao Cristóvão, SE, 49100-000, Brazil

    Ronaldo Santos da Silva

  6. Telecommunication and Materials Science and Engineering of Laboratory (LOCEM), Physics Department, Federal University of Ceará (UFC), Campus PICI, P.O. Box 6030, Fortaleza, CE, Brazil

    Francisco Enilton Alves Nogueira, Tallison Oliveira Abreu, Vitor Carvalho Martins, Roterdan Fernandes Abreu, Felipe Felix do Carmo, João Paulo Costa do Nascimento, Antonio Jefferson Mangueira Sales, Marcelo Antonio Santos da Silva & Antonio Sérgio Bezerra Sombra

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  1. Francisco Enilton Alves Nogueira
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  2. Tallison Oliveira Abreu
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Correspondence to João Paulo Costa do Nascimento.

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Nogueira, F.E.A., Abreu, T.O., Martins, V.C. et al. Evaluation of the Dielectric Properties of CaMoO4‒TiO2 Composites for Microwave Applications Under Temperature Variation. J. Electron. Mater. 52, 2843–2851 (2023). https://doi.org/10.1007/s11664-023-10248-6

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