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- W2131661557 abstract "Based on the works of Ruze and Vu, a novel mathematical model has been developed to determine efficiently the average power pattern degradations caused by random surface errors. In this model, both nonuniform root mean square (rms) surface errors and nonuniform illumination functions are employed. In addition, the model incorporates the dependence on <tex xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>F/D</tex> in the construction of the solution. The mathematical foundation of the model rests on the assumption that in each prescribed annular region of the antenna, the geometrical rms surface value is known. It is shown that closed-form expressions can then be derived, which result in a very efficient computational method for the average power pattern. Detailed parametric studies are performed with these expressions to determine the effects of different random errors and illumination tapers on parameters such as gain loss and sidelobe levels. The results clearly demonstrate that as sidelobe levels decrease, their dependence on the surface rms/ <tex xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>lambda</tex> becomes much stronger and, for a specified tolerance level, a considerably smaller rms/ <tex xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>lambda</tex> is required to maintain the low sidelobes within the required bounds." @default.
- W2131661557 created "2016-06-24" @default.
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- W2131661557 date "1983-01-01" @default.
- W2131661557 modified "2023-10-02" @default.
- W2131661557 title "An efficient computational method for characterizing the effects of random surface errors on the average power pattern of reflectors" @default.
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- W2131661557 doi "https://doi.org/10.1109/tap.1983.1142978" @default.
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