Three necessary conditions for the validity of the Fresnel phase approximation for the near-field beam pattern of an aperture
Ziomek, Lawrence J.
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A simple, straightforward derivation of three necessary conditions that define the region of validity for the near-field directivity function (beam pattern) of an aperture (array) is presented. The derivation of all three criteria is based on determining what conditions must be satisfied in order to obtain a valid Fresnel approximation of the time-independent free-space Green’s function. Comparisons with other near-field conditions in the literature are made.
The article of record as published may be found at https://doi.org/10.1109/48.211494
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