Results 241 to 250 of about 119,781 (297)

Measurement of Dielectric Loss and Wall Loss in a Dielectric-Filled Waveguide

IEEE Transactions on Instrumentation and Measurement, 1974
A waveguide bridge capable of measuring dielectric loss down to 5 ?rad at frequencies of 10-35 GHz is described. A major uncertainty was the value of the wall loss. This has been resolved by measuring the wall loss of the specimen arm both with air and dielectric filling.
Sheila Ayers, D. Marr, A. E. Parker
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Loss Mechanisms in Dielectric-Loaded Resonators

IEEE Transactions on Microwave Theory and Techniques, 1985
Analysis is presented of resonators consisting of a section of a dielectric-loaded waveguide shorted at both ends. The analysis includes resonant frequency calculations, mode charts, and unloaded Q computations. Numerical results are presented for the unloaded Q's of various modes, as a function of the resonator parameters.
K.A. Zaki, C. Chen
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Limiting losses in dielectrics

IEEE Transactions on Dielectrics and Electrical Insulation, 2001
Examination of a wide range of experimental data relating to 'low-loss' dielectric materials reveals the little acknowledged fact that their loss at high frequencies (kHz to GHz) and low temperatures (typically 100 to 200 K) is weakly or very weakly dependent on frequency, what we call 'flat loss', and is likewise weakly dependent on temperature ...
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Low Loss Dielectric Waveguides

IEEE Transactions on Microwave Theory and Techniques, 1954
The history of dielectric waveguides begins back in 1910 with the publication of a theoretical paper by Hondros and Debye, who gave a mathematical treatment of transverse magnetic mode propagation in lossless dielectric guide. In the 1930's Southworth began experimental work on these modes while Carson, Mead, and Schelkunoff developed a general theory ...
E.M. Gyorgy, M.T. Weiss
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Dielectric nanocomposite with high dielectric permittivity and low dielectric loss

2015 IEEE Electrical Insulation Conference (EIC), 2015
Dielectric flexible nanocomposites featuring ferroelectric barium titanate nanoparticles embedded in poly(vinylidene fluoride) (PVDF) matrix were fabricated by a miscible-immiscible coagulation method followed by hot pressing. The SEM images showed good distribution of nanoparticles with very little particle agglomeration.
Youngho Jin, Ning Xia, Rosario A. Gerhardt   +2 more
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Intrinsic dielectric loss in crystals

Advances in Physics, 1991
Abstract We review the current theory of intrinsic dielectric loss, that is the loss in a perfect crystal due to anharmonic interaction of a.c. electric field with the phonon system of the crystal. Both ordinary dielectrics and displacive ferroelectrics are considered. The theory predicts dependence of the loss on frequency ω and temperature T.
V.L. Gurevich, A.K. Tagantsev
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Low-loss percolative dielectric composite

Applied Physics Letters, 2005
In this letter, we report a modified percolative polymer composite that has a low dielectric loss (tanδ∼0.02@10KHz, comparable to that of the polymer matrix), a high dielectric constant (k>100@10KHz, about 30 times higher than that of the polymer matrix), and a low frequency dependence.
Jianwen Xu, C. P. Wong
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Dielectric losses in As2Se3 glass

Solid State Communications, 1971
Abstract Dielectric loss measurements on As 2 Se 3 glass samples at room temperature in the frequency region 10 2 – 10 10 Hz show losses considerable smaller than published values. Definite evidence for localized states was not found. An upper limit of 2 × 10 18 /cm 3 eV for the density of states at the Fermi level follows from these experiments.
C. Crevecoeur, H.J. de Wit
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Dielectric Polarization and Loss

Annual Review of Physical Chemistry, 1960
The subject of dielectric behavior has not previously been dealt with as such in these reviews, although dielectric properties relevant to other sub­ jects have often been mentioned. There have, however, been a number of comparatively recent books and review articles on various aspects of di­ electrics.
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The Dielectric Losses in Impregnated Paper

Transactions of the American Institute of Electrical Engineers, 1933
Accurate measurements have been made of the electrical and other physical properties of 10 insulating oils, of a single grade of wood pulp paper, and of the paper when impregnated with each of the oils. Short time charge and discharge curves under continuous potential have thrown further light on the anomalous conduction as found in oils, and permit ...
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