Development of a novel printed circuit board technology for inductive device applications

摘要

THis paper describes the fabrication and characterisation of 2-dimensional transformers integrated inside printed circuit boards. The transformers basically are composed of three layers of which the outer layers bear the printed coil patterns and the inner layer is a high permeability ferromagnetic sheet core. Both magnetid metal and copper layers are patterned using s tandard lithographic techniques. Electorplated interconnects between the outer layers complete the windings. These transformers are about 600 #mu# m thick, with l ateral dimensions of approximately 1 cm, and exhibit typically inductances of 1-10 #mu# H at a frequency of 1 kHz.