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Julian Bond <[EMAIL PROTECTED]> writes:
> John E. Kreznar <[EMAIL PROTECTED]> wrote:
> >How big would it have to be to behave like a corner reflector and not
> >like just a scatterer?
> Can anyone answer this one?
The reasoning connecting this to the Fresnel zone is as follows:
Imagine that instead of a reflector, there were an aperture of the
same size passing the beam through an opaque wall. We know in this
case that the aperture better be at least something like a Fresnel
zone in size. Much smaller and the transmitted energy will tend to be
scattered uselessly through the far hemisphere. Similar for the
reflector, much smaller than a Fresnel zone and the reflected energy
will tend to be scattered uselessly through the near hemisphere.
This argument glosses over the distinction between a planar and a
corner reflector.
At some reasonable range such as 5 kilometers (10 km round trip) and a
wavelength of 0.125 meters (2.4 GHz), the Fresnel radius is like
sqrt ( .125 x 5000 x 5000 / 10000 )
or about 18 meters.
- --
John E. Kreznar [EMAIL PROTECTED] 9F1148454619A5F08550 705961A47CC541AFEF13
No truckle to any body politic
Imagine there's no countries / to kill or die for --John Lennon, 1971
Disavowal of political allegiance is prerequisite to freedom.
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