<div>This manuscript has been accepted for publication on IEEE Transactions
on Antennas and Propagation.
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<div>Abstract:</div>


<div>The paper adopts an inverse problem approach to examine the role of some
2D geometries in the source reconstruction from far zone data. It aims
at evaluating the number of independent pieces of information, i.e. the
number of degrees of freedom (NDF), of the source and pointing out the
set of far zone fields corresponding to stable solutions of the inverse
problem. Some of the results are relevant to the synthesis problem of
conformal antennas, since a general comparison of different source
geometries in providing radiation pattern specifications is proposed.</div>