Dielectric Constant

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dielectric constant

[‚dī·ə′lek·trik ′kän·stənt]
(electricity)
For an isotropic medium, the ratio of the capacitance of a capacitor filled with a given dielectric to that of the same capacitor having only a vacuum as dielectric.
More generally, 1 + γχ, where γ is 4π in Gaussian and cgs electrostatic units or 1 in rationalized mks units, and χ is the electric susceptibility tensor. Also known as relative dielectric constant; relative permittivity; specific inductive capacity (SIC).
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Dielectric Constant

 

a quantity that characterizes the dielectric properties of a medium—its reaction to an electrical field. In the relation D = ∊E, where E is the field strength and D is the electrical induction in the medium, the dielectric constant is the proportionality factor ∊. For most dielectrics, the dielectric constant in fields that are not very strong is not a function of the field E. In strong fields (comparable to intra-atomic fields), and for certain dielectrics (such as ferroelectric materials) in ordinary fields, the relationship between D and E is nonlinear.

The value of the dielectric constant depends essentially on the type of substance and on the external conditions (temperature, pressure, and so on). In alternating electrical fields the dielectric constant is a function of the frequency of the field E.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
The smaller particles increase breakdown strength, and the larger particles increase the dielectric constant. An example consisted of polyvinylidene difluoride containing 5 to 10 nm silica particles and 75 nm barium titanate particles.
The dielectric constant (relative permittivity), E, is another parameter that can be used in such analysis, as well as for other purposes.
Analysis of the Backscattering Coefficient of the Laboratory Dielectric Constant. The dielectric constants of samples were measured using an Agilent 83630A PNA Analyzer.
In this paper, we introduce the effect of curvature of a conformed circular microstrip printed antenna on the effective dielectric constant, resonance frequency, input impedance, voltage standing wave ratio (VSWR), return loss ([S.sub.11]), quality factor, and bandwidth of such antenna.
where [v.sub.m] and [v.sub.p] are the volume fractions of the solid material and voids (air), respectively, and [[epsilon].sub.m] and [[epsilon].sub.p] are the corresponding dielectric constants for these components.
If a wider bandwidth is required, a dielectric resonator with a lower dielectric constant can be used.
In (5), only terms [[tau].sub.mat] and GP are dependent on properties of material products near or in contact with tags; e.g., their dielectric constants, sizes and shapes, in a complicated fashion.
(2005), Variable dielectric constants by structured porosity for passive ceramic components, Digest of 2005 IEEE MTT-S International Microwave Symposium, pp.
For the purpose of validation, a series of solvents with known relative dielectric constants listed in Table 1 were used.
The impact of the propagation velocity between the pairs within the differential transmission line as shown in Equation 5 is an interaction between the fundamental signal frequency, length of the transmission line, and the difference in effective dielectric constants of the two traces forming the transmission line.
In less dense woods, there are fewer polar groups, which means that the dielectric constants of less dense woods are lower that those of denser woods.
Therefore, numerous alternate dielectrics (e.g., Zr[O.sub.2], Hf[O.sub.2], Hf or Zr silicates, [La.sub.2][O.sub.3]) with dielectric constants greater than Si[O.sub.2] recently have been under intense investigation.