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.
Source: from Federal Standard 1037C and from MIL-STD-188
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