Re: Light from antena?

On Wed, 3 Aug 2005 04:08:08 +0000 (UTC), don@xxxxxxxxxxxxxx (Don
Klipstein) wrote:

>In article <g020f15do7u306gi0cn06dauds0j6on2sm@xxxxxxx>, Eric R Snow wrote:
>>On Tue, 02 Aug 2005 19:57:47 +0200, Dr Engelbert Buxbaum
>><engelbert_buxbaum@xxxxxxxxxxx> wrote:
>>
>>>ngdbud@xxxxxxxxxxx wrote:
>>>
>>>> If light is part of the same spectrum and waveform as radio waves and
>>>> radio waves can be transmitted through an antena then couldn't visible
>>>> light? If a sine wave driver was adjusted to run in the visible
>>>> spectrum and then connected to an earth ground and needle point antena,
>>>> could visible light be seen coming of off the needle point?
>>>
>>>The basic idea is sound, but consider that FM radio has a wavelength of
>>>several meters, long wave radio of several km. That makes building
>>>antennas (which have 1/4 or 1/2 of that length) relatively
>>>straightforward. Wavelength for visible light is 400--700 nm, light
>>>antennas are therefore a subject of nano-technology.
>>Why antennas made that are 1/4 or 1/2 the wave length? Is it because
>>the energy emitted is a sine wave? Or am I totally off base. I'm just
>>curious and have little electrical knowledge.
>
> I do recommend getting from your library and reading relevant sections
>of the "ARRL Handbook" and the "ARRL Antenna Book".
> ARRL stands for "Amateur Radio Relay League", and editions of these
>books 50 or probably more years old remain valid in this area. Antenna
>theory known as of WWII covers this.
>
> - Don Klipstein (don@xxxxxxxxx)
Thanks Don,
I'm going on vacation and will try to get those books before I leave.
Nice, relaxing, reading.
Cheers,
Eric
.

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