High Frequency Characteristics of a Planar Inductor and a Magnetic Coupling Control Device

This paper reports on inductance calculations for a planar inductor and the characteristics of a magnetic coupling control device. First, the high frequency characteristics of a planar inductor, consisting of a meander coil and two magnetic films, was calculated using Neumann´s formula and the reluctance method. The calculated value, taking the skin effect, proximity effect, eddy currents and stray capacitance into account, was in good agreement with the measured value. Second, a magnetic coupling control device was proposed as an application of a planar inductor. It consists of two meander coils and a magnetic film, which is inserted between the two coils. Experimental results show that the magnetic coupling between the two coils is changed by the magnetic film, and that it can be controlled by an external magnetic field.