Accurate Measurements of Permittivity and Dielectric Loss Tangent of Low Loss Dielectrics at Frequency Range 100 MHz - 20 GHz

Givot, B.L.; Křupka, J.; Lees, K.; Clarke, R.N.; Hill, G. J.

doi:10.1109/mikon.2006.4345157

Cited by 3 publications

(7 citation statements)

References 7 publications

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“…Results of measurements presented in this letter are complementary to those that were presented in papers [10] and [21]. One of the main important observations in the paper [21] was that for PTFE both real part of permittivity and dielectric loss tangent are practically constant in frequency range of 100 MHz-20 GHz.…”

Section: Discussionsupporting

confidence: 65%

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Measurements of the Complex Permittivity of Low Loss Polymers at Frequency Range From 5 GHz to 50 GHz

Křupka

2016

IEEE Microw. Wireless Compon. Lett.

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Complex permittivity of Polytetrafluoroethylene (PTFE), Polypropylene (PP), Polyethylene (PE) and cross-linked Polystyrene (Rexolite), has been measured at frequency range from 5 GHz to 50 GHz. Measurements have been performed in two cylindrical cavities employing several quasi TE 0mn modes excited in samples under test. Measurement uncertainties for the real part of permittivity were ±0.5% while for the imaginary part of permittivity in the range from ±8% for the lowest loss materials to ±3% for Rexolite. It has been confirmed that the real part of permittivity of all measured polymers is constant in the microwave frequency spectrum to within measurement uncertainties, while the dielectric loss tangent values vary with frequency

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Section: Discussionsupporting

confidence: 65%

“…One of the main important observations in the paper [21] was that for PTFE both real part of permittivity and dielectric loss tangent are practically constant in frequency range of 100 MHz-20 GHz. In this letter we proved that this conclusion can be extended to the frequencies up to 50 GHz.…”

Section: Discussionmentioning

confidence: 98%

Measurements of the Complex Permittivity of Low Loss Polymers at Frequency Range From 5 GHz to 50 GHz

Křupka

2016

IEEE Microw. Wireless Compon. Lett.

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“…In such applications, composition is determined at various stages to ensure conformance to the laid down ratios. Numerous techniques like liquid chromatography, boiling point distillation, and capillary electrophoresis are available to determine volume fraction of liquids in mixture [4]. These methods are time consuming, require expensive equipment, and differ in techniques depending upon nature of liquid(s).…”

Section: Introductionmentioning

confidence: 99%

“…These methods are time consuming, require expensive equipment, and differ in techniques depending upon nature of liquid(s). Microwave techniques for determining volume fraction of constituents in a mixture have several advantages, like small sample volume [2], instantaneous result [4], small infrastructure, ease in handling, high sensitivity [4], etc.…”

Section: Introductionmentioning

confidence: 99%

“…Microwave technique for determining volume fraction of constituents in a sample under test is based on permittivity sensing capability of certain devices [2,4,5]. Resonant techniques are preferred over other microwave techniques (e.g., transmission and reflection methods) due to high accuracy [4]. In resonant techniques, small volume of material sample is placed inside a resonator.…”

Section: Introductionmentioning

confidence: 99%

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Volume Fraction Extraction for Binary Mixture of Ethanol and Methanol Using Optimized Microwave Microfluidic Sensor

Ejaz¹,

Sami²,

Mughal³

et al. 2019

PIER M

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An optimized microfluidic sensor for extracting volume ratio of binary mixture comprising of ethanol and methanol using electrical resonance technique has been presented in this work. In order to detect small changes in composition of binary mixture, a split-ring resonator structure with enhanced sensitivity was designed to operate around 2.5 GHz. A resonator was designed using HFSS, which possessed enhanced sensitivity. A novel algorithm for optimization was devised for binary mixture of the two liquids. The resonator was fabricated and tested for validation of results. Samples of ethanol and methanol mixture in different volume ratios were prepared and filled in micro-capillary tubes. These tubes were placed inside the resonant structure to perturb electric field. Variations in resonant properties due to change in volume ratio of liquid mixtures were analyzed. Resonant frequency, s-parameters, and quality factor of structure were measured. It was observed that change in volume fraction as small as 1/100 resulted a shift of 0.25 MHz in resonant frequency (relatively high level of sensitivity). Measured results were utilized by mathematical model to compute volume fraction of liquid in these mixtures.

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Extraction of the Wideband Dielectric Properties of a Material Layer Using Measured Natural Frequencies

Rothwell

2010

IEEE Trans. Antennas Propagat.

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Accurate Measurements of Permittivity and Dielectric Loss Tangent of Low Loss Dielectrics at Frequency Range 100 MHz - 20 GHz

Cited by 3 publications

References 7 publications

Measurements of the Complex Permittivity of Low Loss Polymers at Frequency Range From 5 GHz to 50 GHz

Measurements of the Complex Permittivity of Low Loss Polymers at Frequency Range From 5 GHz to 50 GHz

Volume Fraction Extraction for Binary Mixture of Ethanol and Methanol Using Optimized Microwave Microfluidic Sensor

Extraction of the Wideband Dielectric Properties of a Material Layer Using Measured Natural Frequencies

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