Dielectric material becomes conductive at High Frequency?

[logic5]

Dear colleagues,


I have a question related with dielectrics and their conductivity when High Frequency signals are applied.


Is it possible to become conductive a dielectric material if sufficiently High Frequency signals are applied?


When a high frequency signal is applied to a dielectric, at certain frequencies material's dielectric constant falls (this behaviour can be observed in a dielectric spectroscopy). This behaviour is due to the ionic and dipole relaxation and atomic and electronic polarization.

I have heard, at these points, when the dielectric constant falls (or dielectric losses increases) the dielectric material becomes slightly conductive.


Is this true? Could you correct me if not or give me more information about it?


Thank u in adavance,

logic5

 

[IRstuff]

Define "conduct."

A dielectric is the stuff that sits between the plates of a capacitor. Capacitive impedance decreases as a function of frequency.

TTFN

Eng-Tips Policies FAQ731-376

 

[logic5]

thank u!