Table 2 Coupling coefficients between solenoids at different distances.

From: Research on extremely low frequency electromagnetic wave model and simulation in wellbore communication

Distance (m)

Self coupling coefficient

Mutual coupling coefficient

2

1

7.1269 × e−12

5

1

−7.2899 × e−19

7

1

−1.1466 × e−17

10

1

−1.6472 × e−18

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