ELECTROMAGNETIC-FIELD ANALYSIS OF FILM TRANSFORMER

In this paper, we investigate a thin film transformer for small electr onic devices. This transformer is composed of the lamination of thin f ilm conductors. Both the primary and secondary coils of the film trans former are arranged coaxially on one layer and multiply laminated. The operation principle of the transformer is based on the skin effect an d the mutual effect between the coils at high frequency. Using the int egral equation method, we evaluate the electromagnetic field and calcu late the lumped circuit parameters, (e.g. inductance and resistance, e tc.). A fairly good agreement is obtained comparing with experimental values. Thus, the applied method is quite useful for design and invest igation of the thin film transformer.