Stopping antennae with antennae

Stopping antennae with antennae

Posted Nov 21, 2005 20:43 UTC (Mon) by kirkengaard (subscriber, #15022)
In reply to: Richard Stallman's Tin-Foil Hat (Bruce Perens' Journal) by hamjudo
Parent article: Richard Stallman's Tin-Foil Hat (Bruce Perens' Journal)

So, essentially, we're building a closed waveguide around the transmitter to perfectly collect its incident radiation; any openings in the surface become possible transmission points. We're also blocking transmissions from outside, such that the casing perfectly receives the incident probe and does not transmit it to the interior.

How about a double-layer design, two conducting shields spaced by a dielectric? Up to the dielectric's ionization point, we get no conduction of incident energy between shields, and past that, we're left with a better Faraday cage.

Do we need to worry about resonance?

We obviously need to worry about how to reclose the enclosure securely; thinking at most basic of a plastic easter egg, you have two cups, one precisely smaller than the other, such that their open sides nest. The opening betwen these sides would have to be smaller than our wavelength. This would require designing a latch mechanism that effectively blocks useful frequencies while allowing useful mechanical operation. Even a bent slot is an effective transmission gap at the right lengths. What frequencies are we working with/against?

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