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- W1617996874 abstract "Abstract : The overestimation of power density by the Fraunhofer (far-field) approximation to the more exact Fresnel (near-field) diffraction integral is determined as a function of Fresnel number at arbitrary on-axis field points for rectangular and circular aperture illuminations of uniform amplitude and phase. For square and circular apertures, the overestimation is 2.8 percent and 1.3 percent, respectively, at a Fresnel number of 1/8 (corresponding to the far field boundary distance D-sq/ lambda) and 518 percent and 147 percent, respectively, at a Fresnel number of 1. Keywords: Antenna aperture; Aperture distribution of uniform intensity and phase circular aperture; Constructive interference; Destructive interference; Diffraction; Fresnel kirchhoff integral; Fresnel number; Optical aperture; Rectangular aperture." @default.
- W1617996874 created "2016-06-24" @default.
- W1617996874 creator A5017437296 @default.
- W1617996874 date "1987-04-01" @default.
- W1617996874 modified "2023-09-28" @default.
- W1617996874 title "Overestimation of On-Axis Power Density by the Fraunhofer ('Far-Field') Approximation." @default.
- W1617996874 doi "https://doi.org/10.21236/ada186399" @default.
- W1617996874 hasPublicationYear "1987" @default.
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