In the paper titled “Analysis of the Coupling Coefficient in Inductive Energy Transfer Systems” [1], Equation is the voltage drop across the secondary coil and is written as

However, the correct expression is

In addition, the mutual inductance in Equation should be squared, resulting in

As a result, the mutual inductance in Equation (19) must also be corrected, yielding

Finally, the mutual inductance measured when the secondary coil is shorted, shown in Equation , should be written as

Now, the substitution of Equation in Equation of [1] results in the expression given by Equation .