[SI-LIST] : [SI-LIST]:Re: dielectric loss

Vadim Heyfitch (Vadim_Heyfitch@ccm.dp.intel.com)
Thu, 18 Sep 97 18:49:00 PDT

Gentlemen:

there is really only one mechanism responsible for e" (imaginary part of
the dielectric constant). And that is oscillating dipoles, or what Neven
Orhanovic called a "dielectric hysteresis."

The other mechanism - leaky current in a dielectric suggested by Nirmal
- is not there at our typical 1 Ghz.

Why? In order to create a conductive electron in a dielectric, you need
to excite it into a conduction band, creating an electron-hole pair (a
localized electron would absorb a photon/quant of the field and jump up
over the dielectric gap). How much energy does it require? Several
electron-Volts, which is a million times the energy of the 1 GHz EM
field photon. To create a conductive electron in a dielectric you need
to have optical or even higher energy photons (UV, X-rays).

-Vadim Heyfitch
Signal Integrity Engineer
Intel Corp.