From my old radar fixin' days (Raytheon and Lear-Siegler units): at extremely high frequencies, the skin effect becomes so great that the waveguide that carries the energy is hollow, much like a rectangular pipe. IIRC the cross section of the tube is calculated using the wave length of the carrier on whichever axis is used to polarize the antenna. Typically the waveguide inner surface is gold plated, and the pipe is pressurized to prevent moisture intrusion which due to localized heating of condensate will cause severe degradation of the system. Also seem to recall that the THEORETICALLY calculated speed of the propagated energy in the waveguide can be somewhat greater than the speed of light in some systems. Been a long time, this is subject to constructive revision based on technological advances and corrections to an aged memory!
Checking edit function!
This post was edited by smallercrawler at 06:43:15 06/07/13.
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