dielectric

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dielectric

(dī'ĭlĕk`trĭk), material that does not conduct electricity readily, i.e., an insulator (see insulationinsulation
, use of materials or devices to inhibit or prevent the conduction of heat or of electricity. Common heat insulators are, fur, feathers, fiberglass, cellulose fibers, stone, wood, and wool; all are poor conductors of heat.
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). A good dielectric should also have other properties: It must resist breakdown under high voltages; it should not itself draw appreciable power from the circuit; it must have reasonable physical stability; and none of its characteristics should vary much over a fairly wide temperature range. One important application of dielectrics is as the material separating the plates of a capacitorcapacitor
or condenser,
device for the storage of electric charge. Simple capacitors consist of two plates made of an electrically conducting material (e.g., a metal) and separated by a nonconducting material or dielectric (e.g.
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. A capacitor with plates of a given area will vary in its ability to store electric charge depending on the material separating the plates. On the basis of this variation each insulating material can be assigned a dielectric constant. Generally, the dielectric constant of air is defined as 1 and other dielectric constants are determined with reference to it. Other properties of interest in a dielectric are dielectric strength, a measure of the maximum voltage it can sustain without significant conduction, and the degree to which it is free from power losses.

dielectric

[‚dī·ə′lek·trik]
(materials)

dielectric

1. a substance or medium that can sustain a static electric field within it
2. a substance or body of very low electrical conductivity; insulator

dielectric

An insulator (glass, rubber, plastic, etc.). Dielectric materials can be made to hold an electrostatic charge, but current cannot flow through them.
References in periodicals archive ?
13] and compare the frequency behavior of a pure stack of dielectrics with our sequence of DNG MTM and conventional dielectric media.
The extent of miniaturization depends on the type of dielectric media and its thickness.
In addition, since these are manmade materials whose exact composition is known, their conductivity/resistivity is usually known; so concern as to whether radar will perform in these dielectric media is minimal, as opposed to working in soils.