Patent ID: 7709745
Filing Date: 2010-05-04
Classification: H05K

Abstract:
1. A circuit board, comprising: a dielectric layer having at least one opening; at least one pad disposed on the dielectric layer; a transmitting trace disposed on the dielectric layer, one end of the transmitting trace is connected to the pad; and a plating bar disposed on the dielectric layer, only one end of the plating bar is connected to the transmitting trace while another end of the plating bar is located at an edge of the circuit board without any connection, such that the plating bar is an open stub of a signal transmitting structure, wherein the opening is a hollow portion, and the opening is adjacent to at least one side of the open stub of the signal transmitting structure and influences the open stub effect generated from the plating bar and the case that an impedance of a signal transmitting path is to be not matched.