Wideband Low-Frequency Design of Inductors and Wireless Power Transfer Coils Using the Mixed Finite-Element Time-Domain Method

Wideband low-frequency designs of inductors and wireless power transfer (WPT) coils are challenging because of the low-frequency breakdown in traditional numerical methods. In this letter, we apply a recently developed mixed finite-element time-domain (mixed FETD) method to overcome such low-frequency breakdown difficulties in designing inductors and WPT coils and verify the feasibility of the mixed FETD method for such models at low frequencies. This letter provides a demonstration for the design of the low-frequency electrically small electromagnetic devices.