Results 241 to 250 of about 99,897 (293)
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Permittivity Measurements of Macroscopic Particles
1988 Conference on Precision Electromagnetic Measurements, 1988Non-uniform electric fields are used to determine the dielectric properties of macroscopic particles (um). Experimental work on permittivity measurements of microfossils have led to new applications in paleontology.
null Goossens, null Van Biesen
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Permittivity measurement using coaxial resonators
ICECom 2013, 2013The paper presents a coaxial resonator based permittivity measuring system for plane materials, which measures in a non-destructive way. The system is working in frequency range of 700-850 MHz and based on ISM band RF transceivers controlled by microcontroller and the data collected using serial UART-USB interface.
Zoltan Szalay, Istvan Ther, Lajos Nagy
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Biomass measurement by inductive permittivity
Biotechnology and Bioengineering, 1997An electrodeless, inductive permittivity probe is shown to reliably indicate fermentation biomass. By designing the probe based on electromagnetic induction, the electrode polarization artifact-common to electrode-based permittivity measurements of conductive solutions-is eliminated. The measurement of viable biomass concentration (X(V)) is precise and
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Nondestructive permittivity measurement of substrates
IEEE Transactions on Instrumentation and Measurement, 1996The complex permittivity, /spl kappa/'[1-j(tan /spl delta/)], of a thin, flat dielectric is calculated from the characteristics of the H/sub 011/ resonance in a cylindrical cavity, with the specimen inserted on the central transverse plane. Dielectric constants from 1 to 300 have been measured with errors less than 1%.
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Six-port Complex Permittivity Measurements
2006 European Microwave Conference, 2006This paper describes a new method of measuring the complex relative permittivity epsiv* of high-loss and low-loss materials up to the L-band in the microwave range, based on the six-port technique. The novel feature of this method is the determination of epsiv* directly from the intersection of three circles in the complex epsiv*-plane.
A.L. de Souza Rolim +2 more
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Wool-Air Mix Permittivity Measurement
2018 Asia-Pacific Microwave Conference (APMC), 2018Wool is a natural fiber with the potential to be used in wearable RF devices or as a printed-circuit-board substrate reinforcement. Wool fibers are normally woven or entangled, and the resulting textile comprises a substantial amount of air. Therefore, the textile relative permittivity has a magnitude close to unity which is challenging to measure.
Kimberley W. Eccleston +4 more
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Accurate permittivity measurement of PTFE
2018 Australian Microwave Symposium (AMS), 2018The requirements for applications such as 5G or phased arrays are becoming more and more demanding, requiring more accurate material data to achieve the required goals. Here it is shown that only simultaneous measurement of the relevant material data with PTFE leads to reliable results.
Stefan Burger +2 more
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New permittivity measurements of seawater
Radio Science, 1998We have measured the permittivity of representative samples of natural seawater, synthetic seawater, and aqueous NaCl solutions over the frequency range 3–20 GHz, in 0.1‐GHz steps and over the temperature range −2°–30°C in 1° steps. Additional measurements have been made at spot frequencies (23.8, 36.5, and 89 GHz) and at selected temperatures between −
W. Ellison +6 more
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