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Planar Coil Inductor with Closed Magnetic Circuit

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5 Author(s)

A break in the electrical or the magnetic path in a conductor or magnetic core is a serious problem for the fabrication of inductors. A planar-coil inductor with a closed magnetic circuit is proposed, and its characteristics are described. The conductor of the planar-coil inductor is patterned on a plane, in order to prevent the occurrence of disconnections in the conductor. To decrease the magnetic resistance, the cross-sections of core junctions, at which there is the risk of disconnection, are regulated. A trial-fabricated inductor consisted of one hundred magnetic cores, each of size 180 ¿m × 180 ¿m. The inductor dimensions were 2.3×2.3 mm2. The inductance of the device was 50 nH, and the resonance frequency was about 400 MHz.

Published in:

Magnetics in Japan, IEEE Translation Journal on  (Volume:7 ,  Issue: 6 )

Date of Publication:

June 1992

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