Patent ID: 7688594

Claim:
A flexible printed circuit board for connecting an exterior connector electrically, said flexible printed circuit board comprising: an insulation layer; a first signal wiring layer provided on one side of the insulation layer, said first signal wiring layer including a microstrip line; and a second signal wiring layer provided on the other side of the insulation layer, said second signal wiring layer including a signal connection terminal for allowing the microstrip line to connect the exterior connector electrically, and a ground conductive section having a ground connection terminal for connecting the exterior connector, said ground connection terminal being arranged away from the signal connection terminal at a predetermined position connection, wherein the microstrip line and the signal connection terminal are connected to each other by a wiring via hole, said wiring via hole passing through the insulation layer, the first signal wiring layer, and the second signal wiring layer; wherein the microstrip line has a taper section which gradually enlarges a width of the microstrip line toward the wiring via hole in the vicinity of the wiring via hole; and wherein the ground conductive section that corresponds to the microstrip line has a taper section with a shape matching the taper section of the microstrip line.