Wide bandwidth measurement of complex permittivity of liquids using coplanar lines

Raj, Alex Noel Joseph; Holmes, Wayne; Judah, S.R.

doi:10.1109/19.948297

Cited by 44 publications

(11 citation statements)

References 10 publications

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“…The precise permittivity of materials was extracted from the measured transmission coefficient (S 21 ) obtained by artificial neural networks. In the past, a few methods were used consisting of iterative approaches, linear fitting algorithm, and matrix transformation algorithm, for forecasting the permittivity of unknown dielectric samples. However, these approaches suffer the problems of various convergence difficulties.…”

Section: Complex Permittivity Extraction Methodsmentioning

confidence: 99%

Symmetric coplanar waveguide sensor loaded with interdigital capacitor for permittivity characterization

Sun

Guo

et al. 2019

Int J RF Microw Comput Aided Eng

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This article presents the developing of interdigital capacitor (IDC) based symmetric coplanar waveguide (CPW) sensor to characterize the complex permittivity of unknown dielectric sheets. The symmetric structure is realized by using two identical 3 dB CPW dividers where each branch is loaded with an IDC unit. The proposed method is designed using three, five, and seven fingers of the IDC unit, and the measurement sensitivity is analyzed accordingly. The permittivity of tested samples is extracted by the genetic algorithm. To validate the robust sensing performance of the proposed method, simulation and experimental tests are performed and analyzed, and the accuracy is compared with published values. The proposed method gives the maximum error of 3.42%. With the feature of high-sensitivity, the proposed sensor can be used as an excellent candidate for determining the permittivity of materials in microwave frequencies.K E Y W O R D S coplanar waveguide, high sensitivity, interdigital capacitor, permittivity extraction, symmetric sensor

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Section: Complex Permittivity Extraction Methodsmentioning

confidence: 99%

Symmetric coplanar waveguide sensor loaded with interdigital capacitor for permittivity characterization

Sun

Guo

et al. 2019

Int J RF Microw Comput Aided Eng

View full text Add to dashboard Cite

show abstract

“…The precision of the measurement method is limited by the percentage of errors and losses (Raj et al, 2001(Raj et al, , kassem et al, 2007 and by the band of validity of the analysis used. One of the major limitation of this method, and in general, for any non-destructive method is the presence of an air gap between the DUT and the metallic strips ( Fig.…”

Section: Error Analysis Losses and Measurement Limitationmentioning

confidence: 99%

Characterization Techniques for Materials’ Properties Measurement

Kassem

Vigneras

Lunet

2010

Microwave and Millimeter Wave Technologies From Photonic Bandgap Devices to Antenna and Applications

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“…These methods require a means of directing the EM wave towards a material under test (MUT) and then collecting what is reflected and transmitted through it. The non-resonant methods include the waveguide and coaxial transmission line method [3,4,5], free space transmission method [6,7], open-ended transmission line method [8,9], and planar transmission line method [10,11].…”

Section: Introductionmentioning

confidence: 99%

High-Sensitivity Microwave Sensor Based on An Interdigital-Capacitor-Shaped Defected Ground Structure for Permittivity Characterization

Yeo

Lee

2019

Sensors

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This study proposes a high-sensitivity microwave sensor based on an interdigital-capacitor-shaped defected ground structure (IDCS-DGS) in a microstrip transmission line for the dielectric characterization of planar materials. The proposed IDCS-DGS was designed by modifying the straight ridge structure of an H-shaped aperture. The proposed sensor was compared with conventional sensors based on a double-ring complementary split ring resonator (CSRR), a single-ring CSRR, and a rotated single-ring CSRR. All the sensors were designed and fabricated on 0.76-mm-thick RF-35 substrate and operated at 1.5 GHz under unloaded conditions. Five different standard dielectric samples with dielectric constants ranging from 2.17 to 10.2 were tested for the sensitivity comparison. The sensitivity of the proposed sensor was measured by the shift in the resonant frequency of the transmission coefficient, and compared with conventional sensors. The experiment results show that the sensitivity of the proposed sensor was two times higher for a low permittivity of 2.17 and it was 1.42 times higher for a high permittivity of 10.2 when compared with the double-ring CSRR-based sensor.

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Wide bandwidth measurement of complex permittivity of liquids using coplanar lines

Cited by 44 publications

References 10 publications

Symmetric coplanar waveguide sensor loaded with interdigital capacitor for permittivity characterization

Symmetric coplanar waveguide sensor loaded with interdigital capacitor for permittivity characterization

Characterization Techniques for Materials’ Properties Measurement

High-Sensitivity Microwave Sensor Based on An Interdigital-Capacitor-Shaped Defected Ground Structure for Permittivity Characterization

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