# Capacitor with Multi-dielectric

#### seza

Nov 6, 2015
40
Hi All,

I hope you good people can enlighten me on this,

I find capacitors fascinating, the more I find out about them the more questions arise,

Lets say I have a basic capacitor with two conductive parallel plates,
inbetween them I have multi-layer dielectrics of different types:

########### conductive plate
--------------- Dielectric layer 1 with d constant k
========= Dielectric layer 2 with d constant k1
+++++++++ Dielectric layer 3 with d constant k2
########### conductive plate

Will it even function as a capacitor? if so what effect does that have on the overall capacitance?

Many thanks.

#### Harald Kapp

##### Moderator
Moderator
Nov 17, 2011
13,337
inbetween them I have multi-layer dielectrics of different types:
Why would you have that? What's the use of that?
Complex to fabricate and therefore expensive. This is at least an unusual construction.
Will it even function as a capacitor?
Yes.
if so what effect does that have on the overall capacitance?
It depends on the thickness of the different layers. You'll have to calculate an effective/equivalent dielectric constant and thickness for the layer sandwich.

#### davenn

Moderator
Sep 5, 2009
14,197
Why would you have that? What's the use of that?

Maybe you don't know that this is a common problem exercise to work out

It depends on the thickness of the different layers.

and on the different types of dielectrics and their constants

#### Harald Kapp

##### Moderator
Moderator
Nov 17, 2011
13,337
Maybe you don't know that this is a common problem exercise to work out
True, I didn't know. I found out when I stumbled across the article I linked.

Nov 6, 2015
40
Thanks guys.

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