RE: [SI-LIST] : Question on propogation of high freq. signal in conductors

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From: Jian X. Zheng (jian@zeland.com)
Date: Tue Sep 19 2000 - 08:42:00 PDT


Hi,Prasanna:

In short, the skin effect causes the current to be flowing on the surface of
a conductor. In fact, you can demonstrate such a phenomenon on a plane wave
incident onto a big sheet of metal:

     \
      \ plane wave
       \
---------------------------------------- top surface of the metal sheet
        |
        | plane wave in the metal
        |
---------------------------------------- bottom surface of the metal sheet
         \
          \ transmitted plane wave
           \

When a plane wave is incident onto the surface, you will see the electric
field is exponentially decaying in the -z direction. J = Sigma * E, where E
is the electric field, J is the current and Sigma is the conductivity. In
the other word, the J is exponentially decaying and the decaying factor is
very big. It is just like the current only exists on the surface of the
metal sheet. Thanks!

Best regards,

-----------------------------------------------------------------------
Jian-X. Zheng, Ph.D
Zeland Software, Inc., 48890 Milmont Drive, 105D, Fremont, CA 94538, U.S.A.
Tel: 510-623-7162, Fax: 510-623-7135, Web: http://www.zeland.com
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--

> -----Original Message----- > From: owner-si-list@silab.eng.sun.com > [mailto:owner-si-list@silab.eng.sun.com]On Behalf Of prasanna kumar > Sent: Tuesday, September 19, 2000 6:26 AM > To: si-list@silab.eng.sun.com > Subject: [SI-LIST] : Question on propogation of high freq. signal in > conductors > > > Hi, > i have a small doubt. > in high frequencies why does the signal is confined > only to the surface of the conductor? > ie,(if i am putting it right)why does the current > flows only at the surface of the conductor? > thanks. > Prasanna. > > __________________________________________________ > Do You Yahoo!? > Send instant messages & get email alerts with Yahoo! Messenger. > http://im.yahoo.com/ > > **** To unsubscribe from si-list or si-list-digest: send e-mail to > majordomo@silab.eng.sun.com. 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 > **** > >

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