A Metric Function for Fast and Accurate Permittivity Determination of Low-to-High-Loss Materials From Reflection Measurements

Hasar, Uğur Cem; Oral, Emin Argun

doi:10.2528/pier10071308

Cited by 10 publications

(7 citation statements)

References 47 publications

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“…Microwave techniques for dielectric property change measurements have been proposed in a number of applications [1][2][3], from biological materials to cells [4], mixtures of coal and limestone, and electromagnetic compatibility (EMC) [5]. Sensors based on measuring dielectric property changes [6][7][8], such as surface moisture sensors, have been demonstrated as well.…”

Section: Introductionmentioning

confidence: 99%

“…Many different microwave or radio frequency structures, such as coaxial probes, closed or open resonators, antennas and transmission lines, have been employed to measure the permittivity [10][11][12][13][14]. Among these methods, transmission line is a main high frequency structure and even used to measure the characterization of low-k dielectric thin film [15].…”

Section: Introductionmentioning

confidence: 99%

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A Radio Frequency Sensor For Measurement Of Small Dielectric Property Changes

Liu

Yue

2012

Journal of Electromagnetic Waves and Applications

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We propose a sensitive radio frequency (RF) sensor for the measurement of small dielectric property changes. Interference is used to cancel parasitic background signals to improve sensitivity. The device consists of two Wilkinson power dividers, a 180 degree reversephase and an in-phase CPW (coplanar waveguide)-slotline back-toback balun. The small dielectric property changes between de-ionize water and two sets of primary alcohol-water mixtures with different concentrations in terms of molar fractions are measured with clear sensing and identification. The sensor offers almost thirteen times greater sensitivity than conventional transmission lines. Experimental results also show that the lowest detection limit for the molarity of primary alcohol is about 0.25% across the sensitive sensor. Compared with microwave soil moisture sensors the proposed RF device is more sensitive.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Radio Frequency Sensor For Measurement Of Small Dielectric Property Changes

Liu

Yue

2012

Journal of Electromagnetic Waves and Applications

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“…These methods can roughly be divided into resonant and non-resonant methods [4]. Resonant methods have much better accuracy and sensitivity than non-resonant methods [5]. Moreover, the perturbation method associated with the measurement of resonant frequencies and the Q-factor of a cavity can give satisfactory results, but even the advanced variants of this method (for example, [6]) have a principal limitation: The sample size should be very small compared to the dimension of the cavity so that the electric field inside the cavity does not change much due to the presence of the sample.…”

Section: Introductionmentioning

confidence: 99%

An Artificial Nerve Network Realization in the Measurement of Material Permittivity

Chen¹,

Huang²,

Yang³

et al. 2011

PIER

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Abstract-Effective complex permittivity measurements of materials are important in microwave engineering and microwave chemistry. Artificial neural network (ANN) computational module has been used in microwave technology and becomes a useful tool recently. A neural network can be trained to learn the behavior of an effective permittivity of material under microwave irradiation in a test system, and it can provide a fast and accurate result for the permittivity measurement of material. Thus, an on-line measurement has been realized. This paper presents a simple and convenient reconstruction algorithm for determining the dielectric properties of materials. First, a measurement system is designed, and the reflection coefficient is calculated by employing full-wave simulations. Second, an artificial nerve network has been applied, and adequate simulated materials are utilized to train the networks. Last, the trained network is employed to reconstruct the effective permittivity of several organic solvents using the measured scattering parameters, and the reconstructed results for several organic solvents agree well with reference data and the relative errors between them are less than 5%.

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“…Several methods of complex permittivity measurement of dielectrics such as: 1) the free-space technique [1][2][3] and 2) the transmission measurement technique [4][5][6][7][8][9][10] and 3) the cavity perturbation technique [11][12][13], etc, have been developed in the last several decades. Each of these methods has its own advantages and shortages [14,15].…”

Section: Introductionmentioning

confidence: 99%

A Novel Dual-Loop Coupler for One-Port Cylindrical Cavity Permittivity Measurement

Zhang¹,

Zhang²,

Ao³

et al. 2012

PIER

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Abstract-The one-port cavity resonator technique based on the S 11 parameter measurement for measuring the complex permittivity of dielectric samples has been proposed. A novel dual-loop coupler is developed for avoiding and suppressing the spurious modes in oneport cavity resonator. Through threading the pair of half loop in the opposite direction, the opposite surface currents can be generated and only TE 011 mode will be excited. The operating principles of the dualloop coupler are investigated. This technique has the advantages of the coupling. Equivalent electronic circuit model has been set up. Simulation and experimental results show good agreement.

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A Metric Function for Fast and Accurate Permittivity Determination of Low-to-High-Loss Materials From Reflection Measurements

Cited by 10 publications

References 47 publications

A Radio Frequency Sensor For Measurement Of Small Dielectric Property Changes

A Radio Frequency Sensor For Measurement Of Small Dielectric Property Changes

An Artificial Nerve Network Realization in the Measurement of Material Permittivity

A Novel Dual-Loop Coupler for One-Port Cylindrical Cavity Permittivity Measurement

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