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

[boris.traa@xxxxxxxxxxx]

Dear George,

Your reactance may decrease and losses my increase resulting in an 
impedance change. But also the capacitive coupling between the windings 
may change and as such the resonance frequency will change. This can be 
noticed by looking to the phase between the imaginary and real part. 
Anyway do not act a coil as a inductance only. 

Kind regards
Boris Traa

System design engineer EMC

Philips Semiconductors BV, dep. SLE
Location A320/319
PObox 80021, 5600JZ
Eindhoven, The Netherlands
Tel: ++ 31 40 27 22249
Fax: ++ 31 40 27 23238
E-mail:  boris.traa@xxxxxxxxxxxx Seri: btraa@nlsce1









"GEORGE VARGHESE" <rfengg@xxxxxxxxx>
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07-03-2003 12:38
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        Subject:        [SI-LIST] Inductance variation.
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Hi All,
I have one more very interesting observation regarding inductors at RF 
when in the presence of a conducting shield. 
 
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.
 



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