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Re: Inverse Square 'law' Re: About wireless energy transfer

Original poster: "Gav D" <gdingley@xxxxxxxxx>

Hi,
I think it is still an inverse square law, because although you are
focusing the power, it's density is still falling off with the square
of distance, as a perfect beam is impossible. The reflector (or
whatever focusing you are using) only increases the gain of the
radiating structure.

That said, I did try to record the inverse square law with a couple of
10GHz horn antennas, but the power appeared to roll-off at a rate of
1/r. Horn antennas have a gain of only 1.5 I think. I think my
numerical processing is to blame, 1/r^2 should hold.

A rectenna is a form of array where focusing is achieved with the
phase relationship between its different elements (usually dipoles).
The rectenna it's self has microwave diodes to rectify the microwave
energy to DC so that it can be transported away from the antenna more
easily. I guess it's a microwave solar panel.

Gavin

On 2/9/07, Tesla list <tesla@xxxxxxxxxx> wrote:

Original poster: <davep@xxxxxxxx>

 >...Inverse Square 'law'...
    Welllllll.
    And i am NOT proposing New Physics.
    Really.
    8)>>

    "inverse quare' is The Law FOR OMNIDIRECTIONAL sources.
    Each unit radius out from the source the energy gets
    'spread more widely', becomes 'thinner'.  (To put it in
    non mathematical terms.)

    However.
    Ponder, please, a 'Very Well Collimated' beam.
    Parallel.  BIG 'reflector', meaured in wavelengths.
    The beam (laser, microwave) does not get bigger.
    I believe this was the concept for the 'rectenna'
    driven concept.

    Now no real beam will beperfect, but, maybe,
    close enough for 'all practical purposes'.

    best
     dwp