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The paper proposes the design of a tri-mode coupled coil which enables threemodes of operation for inducing electromagnetic field, where the focaladjustment of the E field can be optimized. Methods: The setup consists of twoidentical figure-of-eight coils, namely coil 1 and coil 2, coupled to eachother by magnetic resonance coupling. Coil 1 is driven by active source, wherecoil 2 is driven by the magnetic field coupled from coil 1. The frequency ofoperation would affect the coupling between the coils and hence the currentratios induced. Results: In the first and the second modes, the currentdominates at the first coil and the second coil, respectively. In the thirdmode, both coils conduct similar amount of currents. Conclusion: The concept isproven by measuring the current ratios of the coils and the voltage induced inbiological tissues. The current ratios in the first and the second modes aremeasured as maximum 13.0 and minimal 0.258 at frequencies 487.7 kHz and 453.2kHz, respectively, while the current ratio measured in the third mode is 1.03.Significance: The tri-mode coil could potentially be applied for biologicalapplications such as pulsed electromagnetic energy treatment and thermoacousticimaging.

A Tri-Mode Coupled Coil with Tunable Focal Point Adjustment for Bio-Medical Applications