I remember the day I was reading an optics journal about the far
Infra-Red 1000 micron band... which happens to also be the 1mm RF band.

I work in "ultrasonics" in water and metals which cover the band from
1kHz to 10MHz.  I read the optics journals because a 1mm acoustic wave
in steel refracts, diffracts, etc. a lot like a 1mm optic/RF wave in
space.

Waves is waves.
Sherpa Doug

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