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A.R. Cherrette accuracy of near-field Acosta Aeronautics and Space arbitrary Based on UAT beam direction beam is displaced beamwidth 21.3 calculated from equation Computer Engineering Urbana configuration dB beamwidth defined in equation diffracted field diffraction coefficient dual reflector dual-reflector antenna E-plane H-plane Electrical and Computer elements are placed equation 2.8 equation 3.2 far-field feed elements feed polarized field at point figure 14 focus geometrical optics field GTD analysis H-plane pattern hyperbolic reflector hyperbolic subreflector incident beam incident field incident shadow boundary Lewis Research Center NASA Grant NAG-419 NASA Lewis National Aeronautics Near-field diffraction pattern near-field measurements Near-field recording plane NEAR-FIELD SPILLOVER observation point P.T. Lam parameters are fig Pe(e Performing Organization point feed present a high-frequency radiation patterns reflector antenna S.W. Lee Security Classlf shown in figure sidelobe slope diffraction term Solution 3.2 spillover field subreflector in figure Sunnyvale term A1 THEORY AND EXPERIMENT total field University of Illinois