On 11 oct, 16:20, "Mac Lawson" <newthreat2...@yahoo.com> wrote:
Thanks. So is a 100% effective Faraday cage possible? That is one in
which
no electromagnetic frequencies of any kind can exist?
"Wimpie" <wim...@tetech.nl> wrote in message
news:1192104914.922074.65040@k79g2000hse.googlegroups.com...
On 11 oct, 12:29, "Mac Lawson" <newthreat2...@yahoo.com> wrote:
Ok, so If I construct a Faraday cage from a conductive material that
should
block out a large portion of the electromagnetic spectrum, can I
still
create such electromagnetic wavelengths within the Faraday cage by
combining
other wavlengths at a focal point within it?
Hello,
Yes, you can establish a EM field in closed cage.. When there are no
absorbing materials inside, you can create large field strength with
relative low RF input power.
You can see the cage as a large resonator (can be compared with
acoustic resonance). Internal reflections can interfere in a
constructive (more field) or destructive (less field) way. Closed
cavities are used frequently in the microwave industry (as part of a
filter or a frequency determining component).
In many cases, the reflections from the walls are a problem during
measurement of field parameters.
You did not mention your application. Maybe you can provide us some
additional info.
Best regards,
Wim
PA3DJS
www.tetech.nl
Hello,
As room temperature conductivity is limited, there will be no cage
where the screening is infinite. For many practical uses, a cage can
be constructed with extremely low EM field levels inside. As soon as
you have to open the cage to feed cables in it, problems may arise.
Also when you have measuring equipment in the cage, EM level will
increase especially when the emitted frequency is close to a
resonance.
Maybe you can provide more information about your application.
Best regards,
Wim
PA3DJS
www.tetech.nl
