Patent ID: 7397320

Claim:
A non-uniform differential transmission line pair to reduce cross talk from an aggressor transmission line, the non-uniform differential transmission line pair comprising: a first transmission line on a first layer and a second transmission line on a second layer, each of the first transmission line and the second transmission line having a corresponding first transmission line section, a second transmission line section, and a third transmission line section, wherein the first transmission line section of each of the first transmission line and the second transmission line having a first end and a second end, having a first length L 1 , a first width W 1 and a first line thickness h 1 , and containing an electrically conducting material, the second transmission line section of each of the first transmission line and the second transmission line having a first end and a second end, having a second length L 2 , a second width W 2 and a second line thickness h 2 , and containing the electrically conducting material, the third transmission line section of each of the first transmission line and the second transmission line having a first end and a second end, having a third length L 3 , a third width W 3 and a third line thickness h 3 , and containing the electrically conducting material, where the first end of each second section is joined to the corresponding second end of each first section and the first end of each third section is joined to the corresponding second end of each second section, where at least two of the following conditions are satisfied: the first length L 1 is not equal to the second length L 2 , the first width W 1 is not equal to the second width W 2 , and the first line thickness h 1 is not equal to the second line thickness h 2 ; a dielectric layer disposed between the first transmission line and the second transmission line, wherein the first transmission line and the second transmission line are positioned such that a quasi-twisted pair of transmission lines is effected with the first transmission line sections of the first and second transmission lines being in parallel and spaced apart by a selected transverse separation distance, the second transmission line sections of the first and second transmission lines being in parallel and overlapping each other, and the third transmission line sections of the first and second transmission lines being in parallel and spaced apart by the selected transverse separation distance; and a first ground plane over or under the first transmission line and the second transmission line.