Patent ID: 8031029

Claim:
A differential signal transmission cable, comprising: a first signal transmission line having a first permittivity value and a first length; and a second signal transmission line having a second length, wherein the second signal transmission line comprises a first portion with a second permittivity value and a second portion with a third permittivity value, wherein length percents of the first portion and the second portion are denoted as X and Y respectively, wherein the first permittivity value, the second permittivity value, the third permittivity value, the first length, and the second length are denoted as ∈1, ∈2, ∈3, S 1 , and S 2 respectively, and the relationship among the first permittivity value, the second permittivity value, the third permittivity value, the first length, and the second length is: S1√{square root over (∈1)}=S2×X√{square root over (∈2)}÷S2×Y√{square root over (∈3)}.