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. 2023 Sep 6;134(9):094103. doi: 10.1063/5.0156015

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© 2023 Author(s).

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FIG. 5. — Magnetic flux density concentration effect and optimal aspect ratio for wireless power delivery within footprint constraint. (a) and (b) COMSOL simulation reveals magnetic flux density concentration at various aspect ratios (L/W) of the Metglas laminate. Theoretical data points (black dots) span aspect ratios from 1/10 to 10/1, with a fitted curve (red dashed line) illustrating the trend. (c) Analysis highlights the maximum output power at an optimal aspect ratio of around 3. This trend is primarily attributed to the (d) voltage increase resulting from magnetic flux concentration and (e) rising resistive component of the equivalent ME impedance. Aspect ratios between 2.5 and 3 are between 97% and 99% of the maximum output power. Note that simulated values in panels (b)–(e) are normalized to the value of aspect ratio of 1.