Robustness of Approximated Stratton-Chu Formulation in Solving Low Frequency Problem

The Stratton-Chu (SC) formulation has been applied to model the low frequency problems. With quasi-static limit, the low frequency approximation is made to the Stratton-Chu formulation which results in the decrease of the dimensions for the discretized impedance matrix. In this paper, the robustness of the approximation is well studied and analyzed with a practical nondestructive evaluation testing case. For the common conductor, we show that the approximated SC formulation works up to 50 MHz.