Results 1 to 10 of about 10,676 (263)
A High-Sensitivity Microfluidic Sensor Based on a Substrate Integrated Waveguide Re-Entrant Cavity for Complex Permittivity Measurement of Liquids. [PDF]
Sensors (Basel), 2018 In this study, a novel non-invasive and contactless microwave sensor using a square substrate integrated waveguide (SIW) re-entrant cavity is proposed for complex permittivity measurement of chemical solutions.
Wei Z +6 more
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The Complex Permittivity of Biological Tissues: A Practical Measurement Guideline
IEEE AccessDespite the significant number of studies published on the measurements of complex permittivity of biological tissues in the last thirty years, implementing a successful measurement program for dielectric measurements can still present a challenge for researchers. Most problems are not theoretical but of methodological or practical nature.
Lourdes Farrugia +10 more
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Measuring the Complex Permittivities of Plastics in Irregular Shapes [PDF]
Polymers, 2021 This work presents the measurement of the complex permittivities of high density polyethylene (HDPE), linear low density polyethylene (LLDPE), low density polyethylene (LDPE), polypropylene (PP), Nylon, and thermoplastic vulcanizates (TPV) in irregular shapes at the microwave frequency.
Hsien-Wen Chao +2 more
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Broadband Measurements of Soil Complex Permittivity
Sensors, 2023 Agriculture is a major consumer of freshwater and is often associated with low water productivity. To prevent drought, farmers tend to over-irrigate, putting a strain on the ever-depleting groundwater resources. To improve modern agricultural techniques and conserve water, quick and accurate estimates of soil water content (SWC) should be made, and ...
Justin Stellini +7 more
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Measurement of Complex Permittivity in Free Space
Procedia Engineering, 2015 AbstractThe paper describes the measurement of complex permittivity in free space. It is an advanced non-contact method which is used to find the electromagnetic properties of materials. In this case it involves the materials which are used in aviation technology, especially for hardening the avionics against electromagnetic interference. A specialized
Skočík, Petr, Neumann, Petr
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AN ADAPTIVE CAVITY SETUP FOR ACCURATE MEASUREMENTS OF COMPLEX DIELECTRIC PERMITTIVITY [PDF]
Progress In Electromagnetics Research, 2010 In order to enhance the accuracy of the complex permittivity data employed in Ground Penetrating Radar (GPR) techniques, an adaptive cavity setup is presented. The use of moveable walls permits to relax the mechanical constraints on the sample dimensions so that it can be employed also in complicate measurement condition as, for example, in the case of
G Addamo +5 more
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Complex Permittivity Measurement by Fano-resonance
Procedia Engineering, 2016 Abstract This paper presents a novel, Fano-resonance based complex permittivity measuring sensor. The Fano-resonance is produced by two nested, open-ended coaxial resonators. The resonance characteristic is an extremely narrow, asymmetric resonance curve. Loading the resonator with any substance, the resonance frequency, and the quality factor of the
Szalay, Z., Nagy, L.
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Complex permittivity measurement of optoelectronic substrates
Electronics Letters, 1986 We propose and analyse new techniques to measure both transverse and longitudinal dielectric constants and the loss tangent of anisotropic dielectric samples usually used in integrated optics such as ...
D. Bourreau +2 more
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Using GPS to measure ground complex permittivity
Electronics Letters, 1998 In personal satellite communications, ground specular reflection may be received along with the direct signal. To characterise this effect at L-band, fade measurements were taken over grass and asphalt surfaces using a GPS receiver. By matching experimental results to a simulation, ground electrical characteristics were derived, showing a novel method ...
Xu, GH, Kavak, ADNAN, Vogel, WJ
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Simple non-invasive measurement of complex permittivity
Electronics Letters, 1993 A simple non-invasive sensor measures complex permittivity at microwave (UHF) frequencies from changes in resonance frequency and reflection coefficient. Response to reference liquids is in good agreement with finite difference time-domain calculation.
Johnson, RB +4 more
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