Patent ID: 7924135

Claim:
A transformer, for being configured in a wiring substrate, comprising: a first plane coil, comprising a plurality of first loops, wherein the plurality of the first loops comprises a first inner loop and at least two first outer loops; and a second plane coil, comprising a plurality of second loops, wherein the plurality of the second loops comprises a second inner loop and at least two second outer loops, wherein a first bundle constituted by the first inner loop and the at least two adjacent first outer loops and a second bundle constituted by the second inner loop and the at least two adjacent second outer loops are stridden one over another, the first inner loop has a first segment and a second segment physically separate from the first segment, the second inner loop has a third segment and a fourth segment physically separate from the third segment, and the first segment, the second segment, the third segment and the fourth segment are on the same plane, wherein the first segment of the first inner loop is positioned between the fourth segment of the second inner loop and one of the second outer loops and the third segment of the second inner loop is positioned between the second segment of the first inner loop and one of the first outer loops.