Re: Query on toriod -> ground capacitance
Subject: Re: Query on toriod -> ground capacitance
Date: Fri, 13 Jun 1997 19:48:07 +1200
From: "Malcolm Watts" <MALCOLM-at-directorate.wnp.ac.nz>
Organization: Wellington Polytechnic, NZ
> From: Rodney Graham Davies <Rodney.Davies-at-anu.edu.au>
> To: tesla-at-pupman-dot-com
> Hi all,
> A friend of mine wanted to know this -
> "Why does the capacitance to ground of a toroid increase when you bring
> up higher ? This is an odd occurrence and is probably not linear."
> My own theory is that raising the toroid is practically the same as
> increasing the spacing between to capacitor plates. Here, the plates are
> the ground plain and the toroid...I could be wrong...
For what it's worth, the best answer I can give you is that
by raising the toroid you are progressively removing from it the
influence of the resonator below it. You are also increasing the
*total* size of the whole structure. I cannot spell it out any
clearer than that.
IMHO (and with a load of experiment behind it),