Patent ID: 6184477
Filing Date: 2001-02-06
Classification: H01L,H01R,H05K

Abstract:
A multi-layer circuit substrate comprising:first to fifth insulating layers laminated sequentially,the first insulating layer having an upper face on which a first ground wiring conductor is installed in the shape of a grid;the second insulating layer having an upper face on which a first signal wiring conductor is installed so as to overlie a wiring conductor in one of grid line directions of the first ground wiring conductor;the third insulating layer having an upper face on which a second ground wiring conductor is installed so as to overlie the first ground wiring conductor, the second ground wiring conductor having almost the same grid shape as that of the first ground wiring conductor;the fourth insulating layer having an upper face on which a second signal wiring conductor is installed so as to overlie a wiring conductor in the other grid line direction of the first ground wiring conductor;the fifth insulating layer having an upper face on which a third ground wiring conductor is installed so as to overlie the first ground wiring conductor, the third ground wiring conductor having almost the same grid shape as that of the first ground wiring conductor,wherein a line width of the first signal wiring conductor is equal to or narrower than line widths of the first and second ground wiring conductors, and a line width of the second signal wiring conductor is equal to or narrower than line widths of the second and third ground wiring conductors, andwherein the first signal wiring conductor and the second signal wiring conductor are connected to each other via a through conductor which passes through the third and fourth insulating layers and the second ground wiring conductor so as to be insulated from the second ground wiring conductor.