A miniaturized spectroscopy system for complex permittivity detection of organic mixtures in the 0.65&amp;#x2013;2 GHz frequency range

Helmy, A.; Kabiri, Saman; Bajestan, Masoud Moslehi; Entesari, Kamran

doi:10.1109/mwsym.2013.6697509

Cited by 2 publications

(7 citation statements)

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“…It has also been proven that the value of changes independent of . These results are consistent with the known EM interaction of sensing capacitors with MUTs [21], [22], [24]. 2 Ansoft HFSS v14, Ansys Inc., Cononsburg, PA, USA 2012.…”

Section: B Sensing Element Designsupporting

confidence: 79%

“…As in [21], [22], and [24], the effect of the complex permittivity of a MUT on an interdigitated capacitor appears as the change in the frequency-dependent model of the sensing element, as shown in Fig. 1(a).…”

Section: A Basic Idea and System Functionalitymentioning

confidence: 99%

“…the capacitor. The value of the resistance is also inversely proportional to the frequency and to the value of of the filling material [21], [22], [24]. However, the equations used for interdigitated capacitor calculations are more complex compared to the parallel-plate ones.…”

Section: B Sensing Element Designmentioning

confidence: 99%

“…Similar to [14], [21], [22], and [24], the MUTs are inserted inside plastic tubes fixed on top of the sensing capacitor, as shown in Fig. 12(a), which is a zoomed section of Fig.…”

Section: Circuit Implementation and Test Setupmentioning

confidence: 99%

“…In this paper, a broadband miniaturized dielectric spectroscopy system is presented for complex permittivity detection of lossy organic liquids in the frequency range of 0.5-3 GHz [24]. Complex permittivities are measured using voltage variations across a sensing element exposed to the MUT and embedded inside an impedance divider circuit.…”

mentioning

confidence: 99%

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Complex Permittivity Detection of Organic Chemicals and Mixtures Using a 0.5–3-GHz Miniaturized Spectroscopy System

Helmy

Kabiri

Bajestan

et al. 2013

IEEE Trans. Microwave Theory Techn.

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In this paper, a miniaturized broadband dielectric spectroscopy system is presented for complex permittivity detection of organic chemicals in the 0.5-3-GHz frequency range. A sensing capacitor exposed to a material under test exhibits changes in its capacitance and resistance according to the complex permittivity. The sensing capacitor is embedded inside a wideband impedance divider circuit excited by an external microwave signal at the sensing frequency. The amplitude and phase variation of the microwave signal across the impedance divider is a function of the complex permittivity. Wideband in-phase and quadrautre mixers are used to measure the resulting amplitude and phase variations. A unique calibration algorithm using reference liquids is applied to the fabricated sensor and sensor characteristics are extracted using 2-D surface fitting. Complex permittivity detection of pure organic chemicals is performed with an error less than 1.5% in the 0.5-3-GHz frequency range. The measured points of the permittivity versus frequency are used to estimate the static permittivity using extrapolation with an error less than 1.5% compared to theoretical values. The sensor is also applied to measure the permittivities of binary mixtures with a mixing ratio accuracy of 1%.

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Section: B Sensing Element Designsupporting

confidence: 79%

Section: A Basic Idea and System Functionalitymentioning

confidence: 99%

Section: B Sensing Element Designmentioning

confidence: 99%

“…Similar to [14], [21], [22], and [24], the MUTs are inserted inside plastic tubes fixed on top of the sensing capacitor, as shown in Fig. 12(a), which is a zoomed section of Fig.…”

Section: Circuit Implementation and Test Setupmentioning

confidence: 99%

mentioning

confidence: 99%

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