From: Ray Anderson ([email protected])
Date: Thu Aug 31 2000 - 11:12:17 PDT
.Can I ask you a favour? It would be something you really don't want to do
>this morning i.e. can you let me know
>the equation which would let you figure out the skin depth at various
>frequencies. I would really appreciate it.
>
>I guess I had wrong numbers in mind when I was talking to my boss....
>
>cheers,
>
>Muhammad
OK, here you go:
From Pozar's "Microwave Engineering" page 27 I paraphrase:
skin depth = sqrt(2/(omega * mu * sigma))
= sqrt(1/(pi * freq * mu0 * sigma))
= sqrt(1/(pi * freq * 4pi * 10^-7)) * sqrt(1/sigma)
so for freq = 10 GHz , sqrt(1/(pi * 10^10 * 4pi * 10^-7)) = 5.03 x 10^-3
therefore at 10 GHz skin effect = (5.03 x 10^-3) * sqrt(1/sigma)
for copper sigma = 5.813 x 10^7 skin depth @ 10 GHz = 6.60 x 10^-7 m
aluminum sigma = 3.816 x 10^7 skin depth @ 10 GHz = 8.14 x 10^-7 m
silver sigma = 6.173 x 10^7 skin depth @ 10 GHz = 6.40 x 10^-7 m
-Ray
**** To unsubscribe from si-list or si-list-digest: send e-mail to
[email protected]. In the BODY of message put: UNSUBSCRIBE
si-list or UNSUBSCRIBE si-list-digest, for more help, put HELP.
si-list archives are accessible at http://www.qsl.net/wb6tpu
****
This archive was generated by hypermail 2b29 : Tue May 08 2001 - 14:29:24 PDT