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. 2021 Apr 16;21(8):2822. doi: 10.3390/s21082822

Figure 3.

Figure 3

The mutual inductance between coil Tx and coil Rx can be (a) calculated from Equation (1) and numerically approximated by evaluation of the magnetic field generated by Tx across the area of Rx or (b) analytically calculated from Equation (2) as the sum of the partial mutual inductances between the straight filaments of the two coils.