| US 7,479,862 B2 | ||
| Ferrite material and ceramic substrate | ||
| Tsutomu Mikura, Kirishima (Japan); Kota Ikeda, Kirishima (Japan); and Koichi Nakahara, Kirishima (Japan) | ||
| Assigned to Kyocera Corporation, Kyoto (Japan) | ||
| Filed on Mar. 29, 2006, as Appl. No. 11/394,359. | ||
| Claims priority of application No. P2005-96112 (JP), filed on Mar. 29, 2005; and application No. P2006-045021 (JP), filed on Feb. 22, 2006. | ||
| Prior Publication US 2007/0085121 A1, Apr. 19, 2007 | ||
| Int. Cl. H01F 5/00 (2006.01) | ||
| U.S. Cl. 336—200 | 14 Claims |
| 1. A ceramic substrate comprising:
a plurality of ceramic layers formed of a non-magnetic material;
a ferrite layer formed of ferrite material formed of ferrite containing Fe2O3, CuO, NiO, and ZnO,
wherein the following formulae are satisfied:
63≤a≤73,
5≤b≤10,
5≤c≤12,
10≤d≤23, and
a+b+c+d≤100,
where a content of Fe2O3 is a % by mass, a content of CuO is b % by mass, a content of NiO is c % by mass, a content of ZnO is d % by mass,
wherein said ferrite layer is interposed in the plural ceramic layer; and
a coil-shaped conductor layer embedded in the ferrite layer.
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