Electronics > Beginners
Can antennas emit light? Light vs electricity
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radiolistener:

--- Quote from: Mechatrommer on May 17, 2019, 02:06:02 pm ---the easiest is tip of antenna connected to + of light bulb, - to gnd, there goes your light emitting antenna.

--- End quote ---

Here is another example of light-emitting antenna   ^-^
golden_labels:

--- Quote from: radiolistener on May 17, 2019, 08:03:54 am ---Just try to pass through light through coax cable, you will see it almost don't works due to high loss :)
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It’s just a matter of power. If it is high enough, it will pass and emit light in all directions. Along with some amounts of gases rich in carbon compounds. ;)
ejeffrey:
I seem to remember some research a while back that was using carbon nanotubes as optical frequency coaxial cables and antennas.  I don't remember any details of what they were trying to demonstrate (probably: nanotubes!) or how successful they were.  There is no reason it can't work, but it is really hard in practice due to all the reasons explained above. 
windsmurf:

--- Quote from: Mechatrommer on May 17, 2019, 02:06:02 pm ---the easiest is tip of antenna connected to + of light bulb, - to gnd, there goes your light emitting antenna.

--- End quote ---

Exactly what I was going to say... an incandescent light bulb IS a light emitting antenna.  The filament does the conversion and transmission. So is an LED.
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