Planar Coil Inductor with Closed Magnetic Circuit

H. Matsuki, N. Fujii, K. Shirakawa, J. Toriu, K. Murakami

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


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 μm x 180 μm. The inductor dimensions were 2.3x2.3 mm2. The inductance of the device was 50 nH, and the resonance frequency was about 400 MHz.

Original languageEnglish
Pages (from-to)474-478
Number of pages5
JournalIEEE Translation Journal on Magnetics in Japan
Issue number6
Publication statusPublished - 1992 Jun


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