In article , Jeff Liebermann writes:
let me "see" RF. It certainly would make troubleshooting RF devices
much easier. Essentially, it would be a human eye analog implimented
with RF components. According to theory, if it works for light, it
should also work for RF. At the time, I was working at about 1GHz.
Light is about 400 THz. So, all I need is an eyeball that's 400,000
times larger than the human eye. I'll give myself a -1 for the idea.

A word: synthetic aperture. Remember the dish arrays in
the Jodie Foster movie Contact? You still need the same
scale factor - many times the wavelength - but most of a
dish array can be air.

So with the eyeball analogy, I would first reduce to the
size of the pupil - the aperture - and that is perhaps
5 mm. Times 400K gives 2000m for the same theoretical
resolution. Of course, for a 2D image you would need
an array of antennas spread over a disk of that radius.

Or just calculate directly. I think the angular
resolution of an array or a telescope in radians is
something like

0.22 * wavelength / aperture .

Multiply by about 60 to get degrees.

So for 1 Ghz (.3m) it's 0.22 * .3m / 2000m, or
33 x 10^-6 radians. About 7 seconds of arc.

George