Abstract
A matrix method is developed to calculate the antennas radiation pattern from near-field (NF) data measured over arbitrary surfaces. The principle of the matrix method is to determine the modal expansion coefficients (MEC) by solving a system of linear equations. The number of required measured samples is deduced from the number of modes considering the cylindrical wave expansion (CWE) of antenna radiated fields. Once the modal coefficients are known, the far-field (FF) of the antenna under test (AUT) is obtained. The matrix method has been implemented, and its potentialities are evaluated using a specific arbitrary surface (square section cylinder surrounding the AUT). Numerical (dipoles array) and experimental (base station antenna) results are provided to illustrate the efficiency and the stability of the proposed method.
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