| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a ceramic substrate with a built-in coil, with which the superposition property of the built-in coil is improved and the influence of magnetic lines generated from a conductor for the coil on a semiconductor chip, and a chip component mounted on upper and lower surfaces is significantly inhibited. <P>SOLUTION: This substrate with the built-in coil constituted by sandwiching a first ferrite layer 2 and a second ferrite layer 3, with a flat spiral coil 4 embedded between them, with a pair of insulating layers 1 is constituted by forming a third ferrite layer, whose magnetic permeability is smaller than that of the first ferrite layer 2 and the second ferrite layer 3, between coil conductors of the flat spiral coil 4. <P>COPYRIGHT: (C)2007,JPO&INPIT |
