Journal ArticleDOI
A Method to Measure Complex Dielectric Permittivity With Open-Ended Coaxial Probes
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In this paper , a new method to measure the complex dielectric permittivity (CDP) variation of materials under test (MUTs) with open-ended coaxial probes is presented.Abstract:
This work presents a new method to measure the complex dielectric permittivity (CDP) variation of materials under test (MUTs) with open-ended coaxial probes. The CDP variation of an MUT is a continuous function of frequency as modeled with various dielectric relaxation models. Hence, the accuracy and the repeatability of CDP measurements can be improved by enforcing such spectral continuity. Here, we derive a new formulation that explicitly enforces the spectral continuity via the Debye relaxation model. In particular, we construct a cost functional based on an admittance integral at the tip of an open-ended coaxial probe. The Debye model parameters are substituted into the admittance integral to form a set of nonlinear equations. Later, these equations are iteratively minimized by a Gauss–Newton-based minimization scheme, for measured reflection coefficients when the tip of the probe is in contact with the MUT. The presented method differs from the conventional CDP measurement techniques in two aspects. First, the method looks for a global solution across the investigated frequency spectrum instead of solving CDP values individually at each frequency step. Second, the Debye parameters are directly retrieved without any data-fitting. The presented method is experimentally verified with various liquid samples, and the accuracy of obtained results is compared against the literature.read more
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Proceedings ArticleDOI
Effects of Calibration Process on Complex Dielectric Permittivity Measurements with Open-Ended Coaxial Probes
TL;DR: In this paper , the authors investigate the short-circuit calibration step of the open-ended coaxial probe (OECP) which is one of the major challenges when measuring complex dielectric permittivity (CDP) of a material under test (MUT).
A Guideline for Complex Permittivity Retrieval of Tissue-Mimicking Phantoms From Open-Ended Coaxial Probe Response With Deep Learning
Sulayman Joof,Cemanur Aydinalp,Ismail Dilman,Mehmet Nuri Akinci,Tuba Yilmaz,M. Çayören,Ibrahim Akduman +6 more
TL;DR: In this article , the authors proposed a general guideline and a technique for retrieving the complex permittivities (CPs) of material under test (MUT) from the measured reflection coefficients (RCs) obtained with the open-ended coaxial probe (OECP) through a deep learning model (DLM).
Journal ArticleDOI
Complex Permittivity Measurement Utilizing Multiple Modes of a Rectangular Cavity
TL;DR: In this paper , the authors proposed a novel method for measuring the dielectric constant and loss tangent of dielectral substrates using four resonant modes of the rectangular resonant cavity, TE101, TE105, TE109, and TE1015.
Proceedings ArticleDOI
Complex Permittivity Measurement of Biological Tissues Using the Rational Function Model
TL;DR: In this article , the authors presented the feasibility of rational function method (RFM) in order to measure the complex dielectric parameters (CDPs) of biological tissues with an open-ended coaxial probe.
Complex Permittivity Measurement of Biological Tissues Using the Rational Function Model
TL;DR: In this article , the authors presented the feasibility of rational function method (RFM) in order to measure the complex dielectric parameters (CDPs) of biological tissues with an open-ended coaxial probe.
References
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Kenneth S. Cole,Robert H. Cole +1 more
TL;DR: In this paper, the locus of the dielectric constant in the complex plane was defined to be a circular arc with end points on the axis of reals and center below this axis.
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A large-scale study of the ultrawideband microwave dielectric properties of normal, benign and malignant breast tissues obtained from cancer surgeries
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TL;DR: A large-scale study to experimentally determine the ultrawideband microwave dielectric properties of a variety of normal, malignant and benign breast tissues, measured from 0.5 to 20 GHz using a precision open-ended coaxial probe shows that the contrast in the microwave-frequency dielectrics properties betweenmalignant and normal adipose-dominated tissues in the breast is considerable, as large as 10:1.
Journal ArticleDOI
Measurement of Radio Frequency Permittivity of Biological Tissues with an Open-Ended Coaxial Line: Part I
TL;DR: In this article, an open-ended coaxial line is used as a sensor for in vivo measurement of the complex permittivity of biological substances, based on two computerized network analyzers operating at frequencies from 10 MHz to 1 GHz.
Journal ArticleDOI
An improved technique for permittivity measurements using a coaxial probe
D.V. Blackham,Roger D. Pollard +1 more
TL;DR: In this article, an enhanced model for an open-ended coaxial probe used for making permittivity measurements is presented, including details of the error correction and curve fitting techniques.
Journal ArticleDOI
The dielectric properties of water in its different states of interaction
TL;DR: In this article, a tutorial on dielectric (relaxation) spectrometry of liquids is given, and some methods of measuring complex (electric) permittivity spectra are briefly described.
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