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August 2016

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From:
"Stadem, Richard D." <[log in to unmask]>
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TechNet E-Mail Forum <[log in to unmask]>, Stadem, Richard D.
Date:
Wed, 10 Aug 2016 16:02:48 +0000
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If the conductor thickness is insufficient to handle the skin depth, additional impedance is realized, along with loss of performance (lossy circuit).



-----Original Message-----

From: TechNet [mailto:[log in to unmask]] On Behalf Of Louis Hart

Sent: Wednesday, August 10, 2016 9:28 AM

To: [log in to unmask]

Subject: Re: [TN] looking for medium resistance material



Carl, if the conductor thickness is less than the skin depth, would that mean the magnitude of the evanescent wave electric field would be great enough to allow propagation outside the shield?  Sorry to say, my understanding of electromagnetic field theory is a lot less than what I think it should be, but I am curious.



Regarding aluminum and soldering, I knew a guy who had a roll of 'aluminum solder' on his desk although I never saw him use it.  The wire was several millimeters in diameters, so may not have been for electronic purposes.



On the subject Drew brought up of mu-metal, I inherited a microwave spectrometer long ago which had a klystron housed in the stuff. The fellow who bequeathed it to me said the metal was great for shielding, but its desirable properties were degraded by mechanical forming.



Nice to see good activity on TechNet.  (I may qualify as one of the old-timers, having joined when it first appeared back in 1994 or 1995.)  Louis Hart



-----Original Message-----

From: TechNet [mailto:[log in to unmask]] On Behalf Of Carl Van Wormer

Sent: Wednesday, August 10, 2016 9:16 AM

To: [log in to unmask]

Subject: Re: [TN] looking for medium resistance material



My next attempt will be to try a metalized Mylar, hoping that the thin conductor (much thinner than the skin effect depth) will be good enough for the capacitive shielding, but too thin for significant eddy current flow from the magnetic field.  If that work, I will be left with the "simple" matter of connecting to the shield.  How do you solder a wire to a party balloon?



Thanks,

Carl







Carl B. Van Wormer, P.E., AE7GD

Senior Hardware Engineer

Cipher Engineering LLC

    21195 NW Evergreen Pkwy Ste 209

    Hillsboro, OR  97124-7167

    503-617-7447x303

    [log in to unmask]     http://cipherengineering.com




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