FreeLists / si-list / [SI-LIST] Re: Inductance variation.

["Rich Peyton" <p2rich@xxxxxxxxxxxxx>]

Wouldn't the inductive reactance increase with the increase of frequency
anyways?  But I also think that the high value inductor you are putting =
by
the shield is acting like a ferrite bead which is also considered an
inductor which dampens the high freq component.

Rich

-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] =
On
Behalf Of GEORGE VARGHESE
Sent: Friday, March 07, 2003 6:39 AM
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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