Abstract
The aim of this work is to present a useful estimation for the Number of Degrees of Freedom (NDF) when both the source of the electromagnetic field and the observation domain are arcs of circumferences and when the source is a modulated circumference observed over a circumference. Then, it is shown that for the circumference arc and the elliptical source the use of different source variables does not affect the NDF, but only the shape of the eigenvalues/singular values trend. In all the cases, the observation is in far zone.
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