A Method of Evaluating High-Permittivity and Lossy Materials Using a Cylindrical Cavity Based on Hybrid Electromagnetic Theory

Kinoshita, Motohiro; Kinouchi, H.; Karim, Mohamad Shaiful Abdul; Wakino, Kikuo; Kitazawa, Takio

doi:10.1143/jjap.51.09lf03

Cited by 9 publications

(5 citation statements)

References 23 publications

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“…The resolution limit observed in the characterization of lowloss materials is a common drawback of transmission-line techniques. The complex permittivities and of each layer are also measured by using the resonant method (mono-frequency method) [18], [19], and the results are included in Fig. 14(a) showing the accuracy of the present method.…”

Section: B Measured Resultsmentioning

confidence: 99%

Determination of Complex Permittivities of Layered Materials Using Waveguide Measurements

Karim

Konishi

Harafuji

et al. 2014

IEEE Trans. Microwave Theory Techn.

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An accurate and efficient frequency-dependent measurement method is proposed to determine the individual complex permittivities of a two-layered medium. The sample material under test fills only a part of the waveguide cross section, thus a sample with a high-loss layer can be measured without precise machining of the sample material. In this method, which is based on the accurate and numerically efficient hybrid electromagnetic analysis method, only the transmission parameter, , is measured; the complex reflection parameter, , which is difficult to measure, is not required. Virtual experiments demonstrate the efficiency and robustness of the present method. The procedure has a tolerance for variation in initial guess and shows a rapid convergence. Also, investigating the sensitivity of permittivities to deviations in sample location, thickness, and width reveals that the permittivities are largely uninfluenced. Actual experiments are performed at -band with and without the use of calibration to demonstrate the practicality of the proposed method for assessment of the layered sample including a high-loss layer.Index Terms-Layered sample, hybrid electromagnetic (EM) method, inverse problem, permittivity, spectral-domain approach.

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Section: B Measured Resultsmentioning

confidence: 99%

Determination of Complex Permittivities of Layered Materials Using Waveguide Measurements

Karim

Konishi

Harafuji

et al. 2014

IEEE Trans. Microwave Theory Techn.

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“…In this study, the complex permittivity of composite material is measured based on the transmission-line method which uses a rectangular G-band waveguide rather than mono-frequency resonant methods [22]. This waveguide covers frequencies from 3.95 GHz to 5.85 GHz [23].…”

Section: Characterization Of Composite Materialsmentioning

confidence: 99%

Innovative and Cost-Effective Fabrication Technique for Dielectric Composite Material

Nurfarhana Mustafa,

Syamimi Mardiah Shaharum,

Ahmad Afif Mohd Faudzi

et al. 2024

ARAM

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In this paper, the fabrication process of epoxy resin and nanocomposite barium titanate using a cost-effective apparatus is presented along with measurements of complex permittivity. The material is prepared by mixing epoxy resin and barium titanate powder which has high permittivity. Measurement of complex permittivity of materials is performed using a waveguide technique in the G-band with a frequency between 4 and 6 GHz. The results are then compared with the previous works that use advanced and precision instrumentation. The results indicate that the material’s permittivity, determined using our proposed technique, performs admirably. Specifically, at a frequency of 5 GHz, the permittivity is 7.32 with a loss tangent of 0.025 for a filler concentration of 20%. These values not only meet but also closely match those obtained with high-end equipment. Therefore, the proposed technique could be a good potential as an alternative technique for dielectric material preparation which is suitable to be used as a substrate antenna.

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“…The permittivity measurement can be performed using the free-space, waveguide [29][30][31], or resonant [32][33][34][35] techniques. In this study, the permittivity was measured using the waveguide technique in the microwave region [29,30], with the measurement taking place in the G-band, which covers the frequency ranges of 3.95 to 5.85 GHz.…”

Section: Permittivity Test Of Cellulose Fibersmentioning

confidence: 99%

Effect of Fiber Morphology and Elemental Composition of Ananas comosus Leaf on Cellulose Content and Permittivity

Yusof

Zainol

Aziz

et al. 2023

Curr. Appl. Sci. Technol.

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The fiber morphology and elemental composition of pineapple leaf fibers were analyzed to understand their effect on the cellulose content and permittivity value. Cellulose fiber was extracted from pineapple leaf via the alkaline treatment method, and the content was determined using the Kurschner-Hanack method. The permittivity value of the developed cellulose fiber was measured based on the waveguide technique in the G-band. The surface morphology of the developed fiber was examined with scanning electron microscopy. Meanwhile, energy dispersive X-ray (EDX) spectroscopy was used to identify the elemental composition of the pineapple leaf fibers. The findings were that the cellulose fibers with the least diameter and distance between fibers exhibited the highest permittivity value, which was 1.85. The EDX analysis demonstrated that carbon was the commonest elemental in all fibers, and was 55 wt.% of the total element composition. Furthermore, the results showed that the permittivity value increased as the carbon composition increased, and decreased as the oxygen composition increased. Hence, the morphological and elemental studies of the cellulose fiber are useful in determining the permittivity value of the cellulose fiber for material development. The high permittivity value of the pineapple leaf fibers is believed to have great potential for use in electronic components.

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A Method of Evaluating High-Permittivity and Lossy Materials Using a Cylindrical Cavity Based on Hybrid Electromagnetic Theory

Cited by 9 publications

References 23 publications

Determination of Complex Permittivities of Layered Materials Using Waveguide Measurements

Determination of Complex Permittivities of Layered Materials Using Waveguide Measurements

Innovative and Cost-Effective Fabrication Technique for Dielectric Composite Material

Effect of Fiber Morphology and Elemental Composition of Ananas comosus Leaf on Cellulose Content and Permittivity

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