H∞ approximation with point constraints applied to impedance estimation

This paper offers a flexible new approach to interpolating impedance data by bounded analytic functions. This approach is motivated by the conviction that any scheme for interpolating data from a physical system must incorporate knowledge of the system into the procedure. The classical Nehari's method is extended to include physical constraints from the system and point constraints from the data. An algorithm is developed and applied to estimating the impedance function of an antenna from a minimal data set.[PUBLICATION ABSTRACT]