HIGH FREQUENCY SIGNAL LINE

摘要

PURPOSE:To prevent production of parasitic resonance due to a high frequency signal propagated through a signal line by reducing an interval between simulated ground walls comprising plural viae arranged to both sides of signal lines to be narrow so as to increase the parasitic resonance frequency of the signal line. CONSTITUTION:Lots of viae 500 comprizing metallized conductor poles or the like connecting ground lines 30a, 30b and a ground plane 40 are provided to insulation boards 20 just beneath the ground lines 30a, 30b while allowing the viae to approach the signal line 10 at a small pitch. The interval between simulated ground walls 502 comprising lots of the vias 500 arranged at both sides is reduced to increase the parasitic resonance frequency of the signal line 10. Furthermore the pitch of the viae 500 being components of the simulated ground walls 502 is reduced to prevent it that the high frequency signal propagated through the signal line 10 is leaked to the outside of the viae 500 being components of the simulating ground walls 502 through gaps among the viae 500.