Patent ID: 6750732
Filing Date: 2004-06-15
Classification: G02F,H05K

Abstract:
A circuit board comprising:a ground layer and at least one circuit layer, at least one insulation layer between said ground layer and said at least one circuit layer, said at least one circuit layer having at least one signal bus extending as a substantially straight line in a longitudinal direction of said circuit board and adapted for being supplied with a high-frequency signal, said ground layer having openings therein; and said at least one signal bus having a signal input point adapted to receive said high-frequency signal having a frequency higher than a particular value and a plurality of signal output points adapted to transmit said high-frequency signal, said plurality of signal output points disposed substantially symmetrically with respect to said signal input point in said at least one signal bus, said openings within said ground layer being disposed substantially symmetrically with respect to said signal input point to provide EMI suppression for said circuit board.