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Results 1 - 10
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48
Substrate Integrated Waveguide Cavity Resonators for Complex Permittivity Characterization of Materials
"... Abstract—A novel planar substrate integrated waveguide cavity resonator technique for measurement of complex permittivity is described, which has applications for dielectric measurement sys-tems in the pharmaceutical industry. The high- resonant struc-ture is a modernization of well-known measuremen ..."
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Cited by 2 (0 self)
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Abstract—A novel planar substrate integrated waveguide cavity resonator technique for measurement of complex permittivity is described, which has applications for dielectric measurement sys-tems in the pharmaceutical industry. The high- resonant struc-ture is a modernization of well
Complex Permittivity of Low Loss Thermoplastic Composites Using a Resonant Cavity Method
- Proceedings of 12th International Conference on Composite Materials
, 1999
"... SUMMARY: The use of high energy rate joining of fibre-reinforced thermoplastic (FRTP) composites using microwaves has yielded promising preliminary results [1][2][3] and more research is being carried out so that the technology can find its application in manufacturing industries shortly. Methods s ..."
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Cited by 9 (5 self)
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such as the dielectric probe and waveguide transmission have been successfully used to measure the dielectric constant (ε′) of low loss thermoplastic composites but they cannot give reliable results when used to measure the dielectric loss (ε″)
Evaluation of Complex Permittivities of Multilayer Dielectric Substrates at Microwave Frequencies Using Waveguide Measurements
, 1996
"... The techniques that are presently available for the measurement of complex permittivities of dielectric substrates are only applicable to single layer substrates. This paper presents a new technique which uses the Finite Element Method (FEM) to estimate the complex permittivities of individual layer ..."
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and transmission coefficients are determined as a function of the complex permittivities of the multilayer substrate. Measured and calculated values of the reflection and transmission coefficients are then matched using the Newton-Raphson Method to estimate the complex permittivities of the layers of the sample.
Microwave method for thickness-independent permittivity extraction of low-loss dielectric materials from transmission measurements
- Progress In Electromagnetics Research
"... Abstract-A non-resonant microwave method has been proposed for complex permittivity determination of low-loss materials with no prior information of sample thickness. The method uses two measurement data of maximum/minimum value of the magnitude of transmission properties of the sample to determine ..."
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Cited by 1 (0 self)
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to determine an initial guess for permittivity and find the sample thickness. An explicit expression for sample thickness and two expressions for inversion of the complex permittivity of the sample are derived. The method has been validated by transmission measurements at X-band (8.2-12.4 GHz) of a low
Calibration-Independent Measurements for Complex Permittivity Determination of Low-Loss Dielectric Materials at Microwave Frequencies
"... The work of this article is a contribution to the characterization of new materials at microwave frequencies and enrichment the existing database. The transmission/reflection technique for complex permittivity determination is employed to characterize a set of low-loss dielectric materials. The algo ..."
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Teflon sample (PTFE), and the second is performed with the sample under test. The relative complex permittivity of Delrin, Peek, Spanish Peek, Nylatron, Vulkollan, Arnite and Celotex materials are measured over the X-band frequencies (8.2- 12.4 GHz), and the average relative errors between the calibrated
Uncalibrated Microwave Measurements for Complex Permittivity Determination of Dielectric Materials at X-Band frequencies
"... The transmission / reflection technique for complex permittivity determination is employed to characterize dielectric materials. The algorithm for permittivity extraction eliminates mathematically the systematic errors of the experimental setup. This technique needs two uncalibrated scattering param ..."
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parameter measurements using the Vector Network Analyser; the first is done with a partially filled rectangular waveguide by a standard dielectric Teflon sample (PTFE), and the second is performed with the sample under test. The relative complex permittivity of wood material is measured over the X
Method of Measuring Permittivity of Composite Materials with Hexagonal Ferrite Inclusions
"... Abstract — A new simple method for measuring complex permittivity of substantially lossy composite materials is presented. In this method, a sample of the material under study should completely fill in the cross-section of the single-mode transmission line (waveguide), and the length of the sample m ..."
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Abstract — A new simple method for measuring complex permittivity of substantially lossy composite materials is presented. In this method, a sample of the material under study should completely fill in the cross-section of the single-mode transmission line (waveguide), and the length of the sample
An Approximate Approach to Determining the Permittivity and Permeability near λ/2 Resonances in Transmission/Reflection Measurements
"... Abstract—We present a simple and straightforward approximate approach to removing resonant artifacts that arise in the material parameters extracted near half-wavelength resonances that arise from transmission/reflection (T/R) measurements on low-loss materials. In order to determine material parame ..."
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Cited by 1 (1 self)
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line or on the relative permeability in a rectangular waveguide case. The other material parameters are then found, supplemented with the refractive index obtained from the conventional T/R method. This method applies to both coaxial transmission line and rectangular waveguide measurements. Our
Broad-Band Measurement of all Complex Permeability Tensor Components and Complex Permittivity of Ferrites using a Rectangular
"... Abstract. We have worked out a broad-band characterization method for magnetized ferrimagnetic materials. The technique is based on the reflectionltransmission measurement of the S-parameters of a rectangular waveguide partly loaded with a ferrite that is to be characterized. The device is set in be ..."
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Abstract. We have worked out a broad-band characterization method for magnetized ferrimagnetic materials. The technique is based on the reflectionltransmission measurement of the S-parameters of a rectangular waveguide partly loaded with a ferrite that is to be characterized. The device is set
Accuracy of frequency domain analysis scenarios for the determination of complex dielectric permittivity, Water Resour. Res
, 2004
"... [1] Frequency domain analysis of time domain reflectometry waveforms has been shown to be useful for more accurate water content determination, water content determination in saline soils, and determination of such difficult to measure soil properties as specific surface area and soil solution cond ..."
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Cited by 4 (2 self)
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conductivity. Earlier frequency domain analysis approaches to determine frequency-dependent dielectric properties of soils have used a variety of methods. In this paper, these methods for the determination of dielectric permittivity were compared using the Shuffled Complex Evolution Metropolis algorithm (SCEM
Results 1 - 10
of
48
