Simultaneous Determination of Complex Permittivity and Permeability of Columnar Materials With Arbitrarily Shaped Cross Section

Miyagawa, Hayato; Wakino, Kikuo; Lin, Yu-De; Kitazawa, Takio

doi:10.1109/tmtt.2009.2027201

Cited by 15 publications

(13 citation statements)

References 16 publications

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“…An air gap between the guide wall and sample or deformation due to the loading of an oversized soft sample gives rise to the higher order mode propagation and causes measurement errors [4]. The transmission-line theory using waveguides is modified to eliminate these problems; the sample fills only a part of the waveguide cross section, and EM theory is employed to analyze the scattering characteristics of the partially loaded waveguide [5]- [8]. The materials under test are assumed to be homogeneous in most of these evaluation methods.…”

Section: Introductionmentioning

confidence: 99%

“…In the case of the sample with a lossy and/or high permittivity layer, the measured amplitude of the transmission parameter becomes very weak and causes the degradation of the accuracy of material assessment. As with single-layered homogeneous samples [5]- [8], partial loading of layered samples in the waveguide cross section is advantageous for the evaluation of the samples with a lossy layer. If the permittivity of only one of layers is to be evaluated [15], the measurement of the complex or is sufficient to determine the permittivity.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

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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show abstract

“…The accurate and efficient electromagnetic analytical method is indispensable to work out this evaluation process of materials. The authors have developed a hybrid EM method, which combines the extended spectral domain approach with the mode matching method to analyze the scattering problems in waveguide [1]. This method is used in this paper to evaluate the complex permittivity r ε of a columnar sample with an arbitrarily shaped cross-section placed in a rectangular waveguide.…”

Section: Introductionmentioning

confidence: 99%

“…The dominant TE 10 wave is incident upon the sample, and the scattered fields turned to TE n0 modes are generated with sample. The scattered fields are measured and analyzed by the hybrid electromagnetic method [1]. In this method, first the whole waveguide region is divided into three regions, that is, 1) input 2) output and 3) waveguide with sample.…”

Section: Introductionmentioning

confidence: 99%

Waveguide measurement technique for complex permittivity of materials with high or low losses

Konishi

Kobata

Momoeda

et al. 2012

2012 Asia Pacific Microwave Conference Proceedings

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A novel evaluation method for variety of the dielectric materials with low or high losses is reported. The proposed evaluation method is based on the hybrid numerical method [1] combining the extended spectral domain approach with mode-matching method. This does not include any approximation unlike in the case of the perturbation scheme. The sample may be a columnar structure with the arbitrarily cross section and electrically large or small, and it is placed at arbitrarily position in the waveguide. The size of sample is chosen properly so as to achieve the adequate accuracy of the scattering parameters S 21 measurements with TE 01 mode. For example, the smaller sample should be prepared for the material with high permittivity and/or high loss and it should be placed near to the waveguide wall where the electric field is weaker than in the center for TE 01 mode.Index Terms -material evaluation, hybrid electromagnetic method, waveguide.

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“…The authors have developed a hybrid EM method, which combines the extended spectral domain approach with the mode matching method (ESDMM) [4], and ESDMM has shown a high accuracy and efficiency for material estimation using waveguide [5]. Fig.…”

Section: Introductionmentioning

confidence: 99%

A hybrid mode-matching spectral domain approach for evaluation of complex permittivity of lossy materials in cylindrical cavity

Morishita

Nakao

Wakino

et al. 2010

2010 International Conference on Electromagnetics in Advanced Applications

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 The cylindrical cavity resonator method is presented to evaluate the complex relative permittivity of lossy materials. The loaded sample in the cavity is required to have the rotational symmetry but may have bulky and/or wide sample. To measure the sample at the specified frequency with high Q, movable dielectric supports with low permittivity and low loss are loaded in cavity. Theoretical basis of the method is the hybrid electromagnetic field analysis, i.e. the extended spectral domain approach combined with mode-matching method (ESDMM). The proposed evaluation method is verified with virtual experiments as well as actual measurements.

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Simultaneous Determination of Complex Permittivity and Permeability of Columnar Materials With Arbitrarily Shaped Cross Section

Cited by 15 publications

References 16 publications

Determination of Complex Permittivities of Layered Materials Using Waveguide Measurements

Determination of Complex Permittivities of Layered Materials Using Waveguide Measurements

Waveguide measurement technique for complex permittivity of materials with high or low losses

A hybrid mode-matching spectral domain approach for evaluation of complex permittivity of lossy materials in cylindrical cavity

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