Inductances of coaxial helical conductors

Twisting of conductors is commonly used in various fields of electrical instruments and measurement systems in order to reduce the electromagnetic interference (EMI). Knowledge of inductances for helical conductors is needed for fundamental electromagnetic calculations, e.g. in electromagnetic compatibility studies. In the paper, a calculation method based on the Neumann’s formula is applied for the inductance calculation of coaxial helical conductors of finite length. The exemplary calculations are also presented.