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The inverse source problem in electromagnetics has proved quite relevant for a large class of applications. When it is coupled with the equivalence theorem, the sources are often evaluated as electric and/or magnetic current distributions on an appropriately chosen equivalent surface. In this context, in antenna diagnostics, in particular, Love solutions, i.e., solutions that radiate zero-fields inside the equivalent surface, are often sought at the cost of an increase of the dimension of the linear system to be solved. In this work, instead, we present a reduced-in-size single current formulation of the inverse source problem that obtains one of the Love currents via a stable discretization of the Steklov- Poincar&#x00E9; boundary operator leveraging dual functions. The new approach is enriched by theoretical treatments and by a further low-frequency stabilization of the Steklov- Poincar&#x00E9; operator based on the quasi-Helmholtz projectors that is the first of its (i.e., low-frequency stabilization) kind in this field. The effectiveness and practical relevance of the new schemes are demonstrated via both theoretical and numerical results.

Stabilized Single Current Inverse Source Formulations Based on Steklov–Poincaré Mappings