Patent ID: 8124884

Claim:
A printed circuit board (PCB), comprising: a first surface; a second surface opposite to the first surface; a signal layer located between the first and second surfaces; a positive differential signal line and a negative differential signal both arranged on the signal layer, wherein the positive differential signal line comprises a first segment and a second segment, the negative differential signal line comprises a third segment and a fourth segment, the first segment and the fourth segment are located in a first straight line which has a first permittivity, the third segment and the second segment are located in a second straight line which has a second permittivity and is parallel to the first straight line, the first permittivity is different from the second permittivity; the first segment is juxtaposed in parallel with the third segment, and the second segment is juxtaposed in parallel with the fourth segment; and a first connecting element soldered on the first surface and a second connecting element soldered on the second surface; wherein an end of the first segment adjacent to the fourth segment is electrically connected to a first terminal of the first connecting element, an end of the second segment adjacent to the third segment is electrically connected to a second terminal of the first connecting element; wherein an end of the third segment adjacent to the second segment is electrically connected to a first terminal of the second connecting element, an end of the fourth segment adjacent to the first segment is electrically connected to a second terminal of the second connecting element.