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2026-05-07
Study on the Transmission Characteristics of a WPT System with Double Semicircular Coplanar Coils
By
Progress In Electromagnetics Research B, Vol. 117, 109-122, 2026
Abstract
For small, low-power wireless power transfer (WPT) devices, maintaining constant output power and high transmission efficiency over a wide range of coupling variations remains a significant challenge. The double semicircular coplanar (DSC) coils, featuring unique magnetic field distribution, provide a potential solution for enhancing misalignment tolerance. This paper analyzes the transmission characteristics of a WPT system employing DSC coils. A circuit model for the WPT system with DSC coils is first developed, and its fundamental transmission characteristics are studied. The tolerance of output power and transmission efficiency to positional offsets (X, Y, Z) over various frequency bands is then evaluated. Finally, an experimental DSC coil system that features a stable frequency bandwidth and is largely insensitive to frequency shifts is built. Its misalignment tolerance forms a cuboid spatial zone. Within this zone, namely when the offset of the receiver in X and Y is under half its diameter, the output power and transmission efficiency remain constant, supported by a uniform magnetic field. When the receiver offset is greater than half its diameter, the magnetic field uniformity and mutual inductance change abruptly, leading to a sudden variation in output power and transmission efficiency.
Citation
Suqi Liu, Changxin Guo, Xinying Zhou, Gang Wang, and Yuping Liu, "Study on the Transmission Characteristics of a WPT System with Double Semicircular Coplanar Coils," Progress In Electromagnetics Research B, Vol. 117, 109-122, 2026.
doi:10.2528/PIERB26020904
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