Silver is slightly less than 6% more conductive than copper, therefore
effect of coating is not large. Analyze as all copper for frequencies below
silver thickness = one skin depth and as all silver above. Take an average
in the transition region. Results will be close enough for most purposes.
Orin
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of Don Girard (Redacted sender "girard_don_21@xxxxxxxxx" for DMARC)
Sent: Wednesday, April 01, 2015 12:36 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] How to model a simple 50 Ohm coax with thin coating of Ag
as a return path.
Â
Hi List,
Looking for suggestions on how to model effect of thin coatings in aÂ
simple coax model.
Plan now is to build and measure effects..but would be nice to be able to
model.
Not having too much success. any thoughts appreciated.
assume coaxial geometry
assume no air between any elements.
D= I.D. of outer shell element
d. = O.D. of inner
d = Copper Center core pin O.D. = .762 mm - plated with 762 nanometers of
Silver.
Dielectric between the inner pin and the outer return path = polystyrene.
D = 2.286 mm I.D. of a polystyrene shell - inner surface of shell form
return path by adding a 5 nanometer of a silver coating, everything beyond
the the coating is just polystyrene.
When I try to model in CST - the size of the elements to get any information
about the 5 nanometer coating - well lets just say we got nowhere ?
any suggestions?
Best Regards,
Don Girard
Â
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