Design and simulation of film transformer on flexible polyamide film in very high frequency range

Abstract

Meander planar thin-film transformers were fabricated using a microlithography on a flexible polyamide film surface. The transformer had coils which were placed on either side of the polyamide surface and this type is called a double sided transformer. The output characteristics of the double sided transformer were measured from 0.01 GHz to 2.6 GHz and compared to the output characteristics obtained by simulating the transformer based on a distributed parameter circuit theory. The simulated results for the double sided transformer agreed well with the measured results. A frequency characteristic of the miniature transformer with a simple structure was simulated. These simulation results showed that this type of the miniature thin-film transformer will be able to operate in higher frequency under the condition of the optimal size of thin-film transformer and the magnetic properties of magnetic film.