In optics and radio communications (indeed, in any situation involving the radiation of waves, which includes electrodynamics, acoustics, gravitational radiation and seismology), a Fresnel zone (l {respell|fray|NEL|`}), named for physicist Augustin-Jean Fresnel, is one of a (theoretically infinite) number of concentric ellipsoids which define vol....
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http://en.wikipedia.org/wiki/Fresnel_zone
locus of points on a reflective surface such that the sum of the distances from each of them to the transmission and reception antennas, assuming these antennas to be point sources, is equal to the optical path length increased by an amount contained between two consecutive integer multiples of the half wavelength
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http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=705-04-31
The area around the visual line-of-sight between a radio transmitter and receiver. Since radio waves disperse as they move away from a transmitter, obstructions in the Fresnel zone, such as buildings and trees, will attenuate or reflect the signal, such that the intended receiver may not collect an adequate radio signal for reliable communication.
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http://www.lever.co.uk/wlan-glossary.html
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