Fresnel zone
Region of space between a transmitting and receiving antenna
Fresnel zone
A Fresnel zone (English: fray-NEL), named after physicist Augustin-Jean Fresnel, is one of a series of confocal prolate ellipsoidal regions of space between and around a transmitter and a receiver. The size of the calculated Fresnel zone at any particular distance from the transmitter and receiver predicts whether obstructions or discontinuities along the path will cause significant interference.
Read on Wikipedia · Image Konrad Roeder, CC BY 2.5
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