The main objective of this thesis is the study of three possible ways of determining equivalent currents from radiated field samples solving an inverse problem. The results obtained using the three different formulations are compared with reference results. As we work with synthetic data—simulations—we can access true values of the radiated field at an arbitrary location. From that, we can also evaluate true equivalent currents fulfilling Love’s null field condition. These constitute reference values. As currents fulfilling Love’s condition are directly related to the tangential components of the field at those locations, they are useful for diagnostic purposes. We consider three sets of equivalent electric and magnetic currents, each one obtained solving an inverse problem satisfying different equations.