Circuit properties of coils

Measurements conducted on cylindrical single-layer coils reveal some of their high-frequency properties. A set of measured resonance and antiresonance frequencies is used to determine a series of partial inductances and partial capacitances of a coil, based on Foster´s first form of two-terminal LC networks. Although the procedure departs from most general properties of LC coils, the system of partial capacitances and inductances at low frequencies reduces to coil inductance and self-capacitance. In cases when a coil is operated with one end free, the standard procedure of self-capacitance determination has to be modified accordingly, to take into account the top capacitance of the coil.