On Thu, 30 Aug 2007 17:02:02 -0700, Don Bowey wrote:
"Tam/WB2TT" wrote:
...
I am curious here. At some point you have to switch from metallic conductors
and antennas to lenses and other optics. Any idea what the highest frequency
RF amplifier works at?

It's all subject to state-of-the-art. 50 years ago 300 MHz. was complex to
work with and 10 GHz. was considered way out there. Today 300 MHz is about
as simple as DC and 10 GHz. is fairly straightforward to work with.

I imagine that in another 50 years or less, Integrated hybrid circuits for 3
THz. will be on the shelf items for experimenters to play with.

Whenever they discover neutronium, they can make ångstrom-sized
klystrons. ;-)

Cheers!
Rich