[SI-LIST] Re: Inductance variation.
- From: "Gaurav Agrawal" <agrawal.gaurav@xxxxxxxxx>
- To: <rfengg@xxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Fri, 7 Mar 2003 17:26:57 +0530
Well George, I can put a guess. What I feel is that the shield may act
has a short circuit secondary of a transformer formed by the flux
linkage with the inductor being the primary of the Xmer. Thus, because
of the mutual effect between the two windings, reactance may vary as you
have noticed.
Best Regards
Gaurav.
-----Original Message-----
From: GEORGE VARGHESE [mailto:rfengg@xxxxxxxxx]=20
Sent: Friday, March 07, 2003 5:09 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Inductance variation.
Hi All,
I have one more very interesting observation regarding inductors at RF
when in the presence of a conducting shield.=20
=20
When I put a high valued inductor close to a copper shield and observe
the reactance on a VNA , the reactance seems to decrease at lower
frequencies and the reactance increases at higher frequncies when the
shield is put near the inductor. What I mean is that , the presence of
the copper shield causes the reactance to decrease at the lower
frequencies (20Mhz) and increase at higher frequencies (100Mhz) . Can
anybody tell me the reason for this?
Regards,
George.
=20
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