In radio communications , one of a (theoretically infinite) number of a concentric ellipsoids of revolution which define volumes in the radiation pattern of a (usually) circular aperture . Note 1: The cross section of the first Fresnel zone is circular. Subsequent Fresnel zones are annular in cross section, and concentric with the first. Note 2: Odd-numbered Fresnel zones have relatively intense field strengths, whereas even numbered Fresnel zones are nulls. Note 3: Fresnel zones result from diffraction by the circular aperture. ( 188 )
FRESNEL ZONE
Meaning of FRESNEL ZONE in English
Telecommunication standard terms English vocab. Английский словарь стандартных телекоммуникационных терминов. 2012