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Understanding Near-Field Wireless Power Transfer Systems With Complex Mutual Inductance and Negative Mutual Resistance
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DOI：10.1109/jestpe.2026.3691097.png)
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Abstract
En 中文
Mutual inductance traditionally appears as a scalar quantity in electric circuit theory. However, in wireless power transfer (WPT) systems with dissipative media such as seawater and human tissues, the complex nature of mutual inductance has been observed. Another phenomenon of negative mutual resistance (NMR) also puzzles many engineers in the WPT community. While complex mutual inductance (CMI) and NMR have been studied separately in the literature, they cannot be separated in many WPT systems. This article reviews and examines CMI and NMR in a holistic manner for WPT. Based on electric circuit theory, this article presents an extended WPT theory with a generalized analysis and circuit model of WPT systems to explain the physical nature and coexistence of CMI and NMR. This extended WPT theory shows that these two elements not only co-exist in WPT systems with dissipative media but also in any WPT system with at least one extra induced dissipative current loop in intended relay resonators and unintended conducting paths such as unintended metallic objects and electromagnetic shielding materials. A methodology for optimizing the WPT systems using the CMI and NMR through recompensation of the resonator design to enhance mutual coupling is provided. The theory is illustrated with several WPT examples with practical measurements and simulations.
Keywords:
Complex mutual inductance (CMI)
magnetic coupled resistance
wireless power transfer (WPT)
Journal
I
IF:
4.9
Papers:
249
Citations:
0
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Cited Papers