Characterization of high-Q inductors up to its self-resonance frequency for wireless power transfer applications

The primary coil of an efficient asymmetric inductive link (IL) has a high quality factor and operates near its self-resonance frequency (SRF). Therefore, its characterization is challenging, especially because the measurement instruments must be able to measure a large reactance and a very small resistance at a frequency where the inductor radiates. In this letter, we present a method suitable for characterizing high-$Q$ inductors up to its SRF. The proposed method uses an inductive sensor to characterize the inductor under test without galvanic contact. The method was validated by applying it to the primary coil of an asymmetric IL. The empirical results are consistent with the theoretical model and the full-wave simulations.