Improvement in the Accuracy of Dielectric Measurement of Open-Ended Coaxial Resonators by an Enhanced De-Embedding of the Coupling Network

Marin, Antoni Josep Canos; García-Baños, Beatriz; Catalá-Civera, J.M.; Peñaranda‐Foix, Felipe L.; Gutiérrez-Cano, José D.

doi:10.1109/tmtt.2013.2285359

Cited by 10 publications

(6 citation statements)

References 30 publications

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“…We selected the techniques to achieve the most reliable results depending on the losses of each liquid. Thus, liquid MUTs with higher losses were measured with an openended coaxial resonator [47], whereas liquid MUTs with lower losses were measured with a fully-loaded cylindrical cavity [48]. Macor was measured with a partially filled cylindrical cavity [14], [28] and the Zeolite powder by the dual mode cylindrical cavity of [14].…”

Section: B Dielectric Measurementsmentioning

confidence: 99%

A New Stand-Alone Microwave Instrument for Measuring the Complex Permittivity of Materials at Microwave Frequencies

Gutiérrez-Cano

Plaza-Gonzalez

Canós

et al. 2020

IEEE Trans. Instrum. Meas.

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This paper reports the development of a stand-alone and portable instrument designed to measure the complex permittivity of dielectric materials at microwave frequencies. The equipment consists of an in-house singleport vectorial reflectometer and a resonant coaxial bi-reentrant microwave cavity where the material under test is placed inside a Pyrex vial, making the device appropriate for measuring liquids, semi-solids, powders and granular materials. The relation between the dielectric properties of the involved materials and the cavity resonance has been solved by numerical methods based on mode-matching and circuit analysis. In order to increase the measurement range, so that low to high loss materials can be characterized in the same cavity, the effect of the coupling network is de-embedded from the resonance measurements. The performance of the newly devised instrument is evaluated by error/uncertainty analysis and comparative studies with other wellestablished instruments and methods. Errors lower than 2% in the dielectric constant, and 5% in the loss factor, are found. This simple, portable, affordable and robust device could help non-specialized personnel to accurately measure dielectric properties of materials used in a wide range of microwave applications.

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Section: B Dielectric Measurementsmentioning

confidence: 99%

A New Stand-Alone Microwave Instrument for Measuring the Complex Permittivity of Materials at Microwave Frequencies

Gutiérrez-Cano

Plaza-Gonzalez

Canós

et al. 2020

IEEE Trans. Instrum. Meas.

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“…Several methods for measuring the complex permittivity of materials have been developed over the years, including transmission line methods (Boughriet et al, 1997), coaxial probe methods (Canós Marín et al, 2013), resonant methods (Hirvonen et al, 1996;Works et al, 1944), and free space methods (Ghodgaonkar et al, 1989;Redheffer, 1947). Due to the possibility of measuring effective electromagnetic parameters of compound materials, free space methods are widely used as can be derived from 30 years literature analysis (B. R. Rao, 1989, D. K. Ghodgaonkar et al, 1990 to cite two of the oldest works and M. S. Hilario et al, 2019, A.…”

Section: Introductionmentioning

confidence: 99%

Improved Fabry‐Pérot Electromagnetic Material Characterization: Application and Results

et al. 2020

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While several mm-wave and sub-THz frequency bands are being proposed for next generation wireless systems to meet the increasing traffic demand, the electromagnetic properties of many common use materials at those frequencies still need to be determined. The evaluation of such properties is important for the design and deployment of future wireless networks. Recently, a simple method based on Fabry-Pérot resonance has been proposed to address the need of easy material characterization at mm-wave frequencies. In this study, the method has been improved and applied to the characterization of several materials at mm-wave and sub-THz frequencies, in order to assess its reliability, usability, and accuracy in practical cases. The method is shown to achieve a good accuracy level despite the very simple measurement setup and the great flexibility. However, some application limitations are highlighted and discussed in the paper. A method for electromagnetic material characterization based on an improved Fabry-Pérot technique is presented. Recently, a simple and fast method for the characterization of low-loss materials based on the Fabry-Pérot (FP) resonance that takes place inside a material slab has been proposed (Degli-Esposti et al., 2017).

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“…Moreover, it also shows the effect of different calibration steps on the accuracy of the measurements. An openended coaxial resonator method described in [10] is based on an empirical technique for de-embedding the coupling network excited by electric probes. By eliminating the influence of coupling structure, the open-ended coaxial resonator guaranteed high accuracy in the permittivity determination of materials.…”

Section: Introductionmentioning

confidence: 99%

An additional S-shaped structure for sensitivity improvement of coaxial probe for permittivity determination of low loss materials

Jiao¹,

Jin²,

Yang

2015

Meas. Sci. Technol.

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Permittivity measurement of materials is important in microwave chemistry, microwave material processing and microwave heating. The open-ended coaxial line method is one of the most popular and effective means for permittivity measurement. However, the conventional coaxial probe has difficulty in distinguishing small permittivity variations for low loss media. In this paper an additional S-shaped structure is proposed for sensitivity improvement of a coaxial probe for permittivity determination of low loss materials at 2.45 GHz. The small permittivity variation can be distinguished due to field enhancement generated by the additional S-shaped structure. We studied the variation of reflection coefficient amplitude for three kinds of samples with different moisture content, within the probe at different insertion depths. We find that the conventional coaxial probe cannot distinguish small permittivity variations until the moisture content of materials reaches 3%. Meanwhile, the probe with the S-shaped structure can detect such small permittivity variations when the moisture content of samples changes by only 1%. The experimental results demonstrate that the new probe proposed in this paper is reliable and feasible.

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Improvement in the Accuracy of Dielectric Measurement of Open-Ended Coaxial Resonators by an Enhanced De-Embedding of the Coupling Network

Cited by 10 publications

References 30 publications

A New Stand-Alone Microwave Instrument for Measuring the Complex Permittivity of Materials at Microwave Frequencies

A New Stand-Alone Microwave Instrument for Measuring the Complex Permittivity of Materials at Microwave Frequencies

Improved Fabry‐Pérot Electromagnetic Material Characterization: Application and Results

An additional S-shaped structure for sensitivity improvement of coaxial probe for permittivity determination of low loss materials

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