The calculation of mutual inductance of coaxial coils by using the calculating functions

The idea of the calculation of coils mutual inductance is based by using the calculating functions. These are normalised functions and depend of normalised variables, In this paper we are restricted in the case of coaxial coils with uniform current distribution, The calculating functions of coaxial coils depend of two variables, so the graphic representation is possible. We have generated some of the calculating functions with their approximate expressions. Also the expressions for the calculation of coaxial coils mutual inductance by respective calculating functions are given. The calculating functions can be used for calculation of the self-inductance of the different type coils as well.