Modelling of microwave elliptical and conical tip sensors for in vivo dielectric measurements

Lee, Kim Yee; Hau, Ng Wai; Kuan, Chung Boon; Nan, Phua Yeong; Sheng, Lin Horng; Hock, Lim Eng

doi:10.1109/rfm.2015.7587749

Cited by 6 publications

(3 citation statements)

References 8 publications

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“…The capacitance model is the most common and well known model for an open ended coaxial to extract the information of dielectric constant from a sample under test as illustrated in Figure . The dielectric properties can be computed by using the reflection coefficient at the tip of sensor that can be expressed as

normalΓ = \frac{1 - j normalω Z_{0} ([], C ((), {normalε}_{r}) + C_{f})}{1 + j normalω Z_{0} ([], C ((), {normalε}_{r}) + C_{f})}

where C (ε r ) = ε r C 0 , C 0 is the capacitance of air, C f is the capacitance independent of the object, ω is the angular frequency, and Z 0 is the characteristic impedance.…”

Section: Model For Microwave Dielectric Sensorsmentioning

confidence: 94%

“…The complicated mathematical calculation can be eased by using MATLAB algorithms for the dielectric determination. Besides, the dielectric spectroscopy of a sample under test can be interrelated with the important parameters and can be derived using a coaxial sensor inverse model …”

Section: Introductionmentioning

confidence: 99%

“…Besides, the dielectric spectroscopy of a sample under test can be interrelated with the important parameters and can be derived using a coaxial sensor inverse model. 14 On the other hand, concrete is one of the most important material among all building materials. 15 Foamed concrete is made by introducing air or other gas into a cement mortar slurry, which air voids are entrapped in mortar by suitable foaming agent.…”

Section: Introductionmentioning

confidence: 99%

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Frequency spectrum analysis of lightweight foamed concrete using microwave dielectric measurement technique

Lee

Phua

Lim

et al. 2018

Micro & Optical Tech Letters

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The dielectric characterization of concrete is a significant parameter to study the microwave signal transmission for the building materials. In this paper, a microwave measurement system has been developed using open ended coaxial sensor and vector network analyzer for frequency spectrum analysis of lightweight foamed concrete. The measurement setup is validated prior to make sure the system is working properly. The results of dielectric constant and loss factor of different densities lightweight concrete samples are measured and analyzed from 150 kHz to 8 GHz. From the analysis, the lightweight foamed concrete is a frequency spectrum friendly building material. In addition, the relationship between the dielectric constant and density of the lightweight foamed concrete is found to be interrelated. The empirical modeling of some selected frequencies has been formed. The models are useful for the future application on determining the dielectric constant and characteristic of lightweight concrete samples.

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normalΓ = \frac{1 - j normalω Z_{0} ([], C ((), {normalε}_{r}) + C_{f})}{1 + j normalω Z_{0} ([], C ((), {normalε}_{r}) + C_{f})}

where C (ε r ) = ε r C 0 , C 0 is the capacitance of air, C f is the capacitance independent of the object, ω is the angular frequency, and Z 0 is the characteristic impedance.…”

Section: Model For Microwave Dielectric Sensorsmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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