Patent ID: 7479862

Claim:
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 Fe 2 O 3 , 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 Fe 2 O 3 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.