An Adaptive Cavity Setup for Accurate Measurements of Complex Dielectric Permittivity

Addamo, Giuseppe; Virone, G.; Vaccaneo, D.; Tascone, R.; Peverini, O. A.; Orta, Renato

doi:10.2528/pier10042606

Cited by 15 publications

(8 citation statements)

References 20 publications

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“…This method results in higher sensitivity than reported in [16], which is around 2 dB in 50-110 GHz. The sensitivity reported here can be further increased by applying resonant [22,23] or differential techniques. The sensor configuration can also be used as a THz spectroscopy tool for liquids, utilizing numerical or analytical [24,25] techniques to estimate the permittivity function of liquids in the CT.…”

Section: Modeling and Experimental Resultsmentioning

confidence: 99%

Integrated Waveguide Structure for Highly Sensitive THZ Spectroscopy of Nano-Liter Liquids in Capillary Tubes

Matvejev¹,

Tandt²,

Ranson³

et al. 2011

PIER

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Abstract-Terahertz dielectric spectroscopy permits the study of biomolecular interactions. However, water induces high attenuation of electromagnetic waves in the THz frequency range, obscuring the response of biomolecules. The developed sensor overcomes this problem by concentrating the THz wave propagating in an integrated waveguide on a small liquid volume contained within a capillary tube. Detailed electromagnetic modeling shows effective interaction between the THz waves and liquids. Transmission measurement results for capillary tubes filled with water and methanol mixtures demonstrate a substantial increase in sensitivity to changes of liquid permittivity. The current integrated sensor facilitates THz spectroscopy of biological liquids: a case study on buffered human serum albumin solution demonstrates a great potential to complement biochemical analytical tools.

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Section: Modeling and Experimental Resultsmentioning

confidence: 99%

Integrated Waveguide Structure for Highly Sensitive THZ Spectroscopy of Nano-Liter Liquids in Capillary Tubes

Matvejev¹,

Tandt²,

Ranson³

et al. 2011

PIER

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“…[7]. At present, there are many ways to measure the permittivity and permeability of the absorbing material [8][9][10]. After obtaining the permittivity and permeability, the reflectivity can be derived.…”

Section: Introductionmentioning

confidence: 99%

A Field Performance Evaluation Scheme for Microwave-Absorbing Material Coatings

2017

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Performance evaluation is an important aspect in the study of microwave-absorbing material coatings. The reflectivity of the incident wave is usually taken as the performance indicator. There have been various methods to directly or indirectly measure the reflectivity, but existing methods are mostly cumbersome and require a strict testing environment. What is more, they cannot be applied to field measurement. In this paper, we propose a scheme to achieve field performance evaluation of microwave-absorbing materials, which adopts a small H-plane sectoral horn antenna as the testing probe and a small microwave reflectometer as the indicator. When the size of the H-plane sectoral horn antenna is specially designed, the field distribution at the antenna aperture can be approximated as a plane wave similar to the far field of the microwave emitted by a radar unit. Therefore, the reflectivity can be obtained by a near-field measurement. We conducted experiments on a kind of ferrite-based microwave-absorbing material at X band (8.2-12.4 GHz) to validate the scheme. The experimental results show that the reflectivity is in agreement with the reference data measured by the conventional method as a whole.

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“…It should be noted that in study [11] On the other hand, the experimental validation remains very limited by the available techniques for measuring the electromagnetic properties of human tissues, even though lately some approaches have been developed for measurement of permittivity of complex tissues that might be used, to some extent, and for biological tissues [21][22][23][24][25].…”

Section: Ghzmentioning

confidence: 99%

Derivation of Electromagnetic Properties of Child Biological Tissues at Radio Frequencies

Ibrani

Ahma²,

Hamiti³

et al. 2011

PIER Letters

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Abstract-The knowledge of electromagnetic properties of biological tissues is required to assess the radio frequency energy deposition in children exposed to electromagnetic fields. The issue whether children should be considered a dosimetric sensitive group in comparison to adults, to which the confirmation of age-dependence of human tissue electromagnetic properties potentially may contribute remains debatable at scientific forums. This paper derives the formula for calculation of electromagnetic properties (permittivity and conductivity) of children tissues, as a function of height, weight, and age, respectively. By using the proposed formula, we have calculated and presented electromagnetic properties of the muscle, brain (gray matter) and skin for 1-year-old to 10-year-old children for 900 MHz, 1800 MHz and 2.4 GHz, at which frequencies most of radio frequency devices used by children operate. The trend over the age of child electromagnetic properties has been presented, and electromagnetic properties at different frequencies for the same child age have also been compared. For certain tissues, comparison between the children at various age and adult electromagnetic parameters has been given. A database with electromagnetic properties for children, of all ages, tissues and frequencies may be built up with the proposed approach. It will further advance research on the assessment of children exposure to electromagnetic fields. Formula can also be used for the determination of electromagnetic parameters for children with specific height and weight.

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An Adaptive Cavity Setup for Accurate Measurements of Complex Dielectric Permittivity

Cited by 15 publications

References 20 publications

Integrated Waveguide Structure for Highly Sensitive THZ Spectroscopy of Nano-Liter Liquids in Capillary Tubes

Integrated Waveguide Structure for Highly Sensitive THZ Spectroscopy of Nano-Liter Liquids in Capillary Tubes

A Field Performance Evaluation Scheme for Microwave-Absorbing Material Coatings

Derivation of Electromagnetic Properties of Child Biological Tissues at Radio Frequencies

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