Results 251 to 260 of about 21,537 (304)

Measurement of the permittivity of dielectrics

Measurement Techniques, 1968
1. Our experimental investigations have shown that the accuracy in measuring the polarization parameters and determining the e value depends mainly on the error in calibrating the polarizing and the analyzing devices, which, in our case, did not exceed 5–7%. 2.
S. I. Pozdnyak, G. N. Anikeenko
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Microwave permittivity measurements of two conifers

IEEE Transactions on Geoscience and Remote Sensing, 1998
Complex permittivity spatial distributions of two conifers, a 5.0-m high Caucasian fir (Abies normanniana) and a 1.9-m high spruce (Picea omorika), have been measured in the frequency range 1-10 GHz. Unlike earlier studies, particular attention was paid to the anisotropy of the dielectric properties.
Ann Franchois, Yolanda Pineiro, Roger H. Lang   +2 more
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Dimensional analysis of a permittivity measurement probe

IEEE Transactions on Instrumentation and Measurement, 2002
Open-ended coaxial-line probes provide a convenient means of determining the dielectric properties of many materials over a relatively wide frequency range. Because of this, much attention has been given to understanding the interaction of the probe and the material which it is inserted into.
Philip G. Jr. Bartley, Stuart O. Nelson, Ronald W. McClendon   +2 more
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Biomass measurement by inductive permittivity

Biotechnology and Bioengineering, 1997
An 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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Permittivity Measurements of Macroscopic Particles

1988 Conference on Precision Electromagnetic Measurements, 1988
Non-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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Nondestructive permittivity measurement of substrates

IEEE Transactions on Instrumentation and Measurement, 1996
The 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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A bridge for the measurement of permittivity

Proceedings of the IEE - Part B: Radio and Electronic Engineering, 1956
A description is given of a null method for the measurement of the complex permittivity of dielectrics. The direct admittance of a 3-terminal capacitor with the sample as dielectric is measured as a complex capacitance, the two components being indicated directly on two 3-terminal variable air capacitors.
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Accurate permittivity measurement of PTFE

2018 Australian Microwave Symposium (AMS), 2018
The 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, Wolfgang Taute, Michael Hoeft   +2 more
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Measurement of permeability and permittivity of ferrites

Measurement Science and Technology, 1990
The dielectric and magnetic properties of some ferrite materials have been measured by four widely different methods. These are measurements in waveguide at 14 GHz using a slotted line approach; measurements in waveguide using S parameter data; the open resonator at 24 GHz (the solution of the equations is presented); and an oblique reflection method ...
A C Lynch, D Simkin
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Free space measurement of permittivity

Twelfth International Conference on Antennas and Propagation (ICAP 2003), 2003
This paper presents a free space technique for the measurement of the complex permittivity of a slice of dielectric sample. The experimental set up is described and the technique validated by measurements on well characterised dielectrics at J band whereupon it is concluded that the method would be suitable for use in the millimetre wave band. Measured
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