| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a glass ceramic substrate comprising a built-in coil which can obtain a higher superimposing characteristic by reducing leakage magnetic flux generated on each coil conductor. <P>SOLUTION: In an insulated base material 1 formed by laminating a plurality of sheets of glass ceramic insulating layer, a plurality of layers of coil conductors 3 are baked and formed simultaneously with the glass ceramic insulating layer and also embedded therein. Moreover, a ferrite layer 2 in the same size as the glass ceramic insulating layer and grounded conductor layers 4 which are formed opposing the coil conductors 3 at the upper and lower surfaces of the ferrite layer 2 are also formed. The coil conductors 3 are covered with low permeability layers 7 having the permeability lower than that of the ferrite layer 2. <P>COPYRIGHT: (C)2005,JPO&NCIPI</p> |
