Magnetic coupling in Tesla transformers

Although many publications dealing with Tesla transformers have appeared, most are confined to detailed investigations of the transformer performance based on a lumped equivalent circuit. The present paper differs widely from these in being concerned with the very practical and important issue of the degree of magnetic coupling between the two transformer windings and considers in detail the importance of the coupling factor for a range of applications of these transformers. The constructional features that may be adopted in various practical implementations are explained.