Re: Faraday Cage

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Paul Nicholson by way of Terry Fritz <twftesla-at-qwest-dot-net>" <paul-at-abelian.demon.co.uk>

The mesh cage will do a pretty good job of attenuating the E field,
but will not achieve the same reduction of the H field.

As Jim says, it would do better if it was a continuous sheet with
thickness greater than the skin depth.

It would only be really effective if it was superconducting, which
would stop the H field completely.

It's a case of reducing the resistive part of the surface impedance
to zero.  Chicken wire falls a long way short of this.  Silver plated
copper sheet would be a lot better.  To achieve an effective shield
requires a determined effort, as dwp has described in the past.

In this case, it would be helpful to know the limiting field
strengths tolerable by the pacemaker.  Are there any specs?  Likely
there will be some frequencies to which the pacemaker is more
sensitive than others.

Without knowing where to stop, the engineering effort of the cage
will eventually dwarf that of the coil itself.  Some target spec must
be established first.  Wanted: pacemaker RF susceptibility expert,
apply here.
--
Paul Nicholson
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