Evaluation of dielectric properties of the barium titanium silicate (Ba2TiSi2O8) for microwave applications

Abreu, R. F.; Abreu, T. O.; Colares, D. da M.; Saturno, S. O.; Nascimento, João Paulo Costa do; Nobrega, F.; Ghosh, Anupama; Vasconcelos, S. J. T.; Sales, Juscelino Chaves; Andrade, Humberto Dionísio de; Júnior, I. S. Queiroz; Sombra, A. S. B.

doi:10.1007/s10854-021-05414-7

Cited by 7 publications

(5 citation statements)

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“…These results are extremely important for mi-crowave applications, as they demonstrate an increase in the thermal stability of the SBN matrix and they encourage the manufacture of new composites with greater additions. Analyzing the results obtained, it is observed that the additions made in the SBN matrix caused the improvement of the main properties necessary for a DRA (ABREU et al, 2021;HAYDOURA et al, 2021;PETOSA, 2007).…”

Section: Resultsmentioning

confidence: 96%

“…With the data obtained from the monopole experiment and using numerical simulation, it was possible to obtain the following far-field parameters: Directivity; Gain; Reflection coefficient (Γ); Voltage standing wave ratio (VSWR); Energy reflection coefficient (Γ pwr ); Energy transmission coefficient (T pwr ); Radiation efficiency (Eff). It is worth mentioning that these data provide the operation standards of materials such as DRA or other devices that operate in the microwave region (ABREU et al, 2021;POOLE;DARWAZEH, 2015).…”

Section: Resultsmentioning

confidence: 98%

“…The cylindrical DRA has a radius (a), height (h), and (d) is the height of the probe. According to the literature (ABREU et al, 2021;ABREU et al, 2021), the quality factor Q and the resonant frequency can be accurately calculated according to the following equations,…”

Section: Methodsmentioning

confidence: 99%

“…From the experimental results of return loss (S11) and the real (Z') and imaginary (Z") impedances, a numerical simulation was carried out to obtain far-field parameters, compare experimental results with simulated ones and, evaluate the application of materials such as DRA (HAYDOURA et al, 2021;OLIVEIRA et al, 2019). Ansoft HFSS (High-Frequency Structure Simulator) software was used to perform the simulation and through it was possible to obtain the parameters: directivity, gain, antenna efficiency, and radiation diagram, etc (ABREU et al, 2021).…”

Section: Methodsmentioning

confidence: 99%

“…Their high permittivity and low losses allow the miniaturization and use of these materials in different electronic components, such as filters, oscillators, amplifiers, tuners, etc. (ABREU et al, 2021;MOUL-SON;HERBERT, 2003;SEBASTIAN, 2008;WANG et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

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EFFECTS OF La2O3 AND Bi2O3 ADDITIONS ON THE MICROWAVE DIELECTRIC AND ANTENNA PROPERTIES OF SrBi2Nb2O9 CERAMIC MATRIX

Abreu

Silva

Saturno

et al. 2021

jme

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This work presents a comparison between the dielectric properties of the SrBi 2 Nb 2 O 9 (SBN) ceramic matrix and the individual additions of Bi 2 O 3 and La 2 O 3 , suggesting the material that would be most suitable for microwave applications. The SBN sample was synthesized by solid-state reaction, and the X-ray diffraction method (XRD) was used for the structural characterization of the materials analyzed in this study. Thermal stability of the samples was measured experimentally by studying the temperature coefficient of resonant frequency (τ f ) the results confirm that the individual additions of 15 wt% of Bi 2 O 3 or La 2 O 3 improved the thermostability of the composites. The Hakki-Coleman method was used to obtain the dielectric properties in the microwave range, and it is possible to observe that the dielectric permittivity of the composites increased, while their loss tangents decreased. The numerical simulation demonstrated the functioning of the materials as dielectric resonating antennas (DRA), with a reflection coefficient below -10 dB in all samples.

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Section: Resultsmentioning

confidence: 96%

Section: Resultsmentioning

confidence: 98%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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