Intel Corporation
Pseudo-stripline using double solder-resist structure

Abstract:

An integrated-circuit package substrate includes a pseudo-stripline that is shielded below a lower solder-resist layer and an upper solder-resist layer, where an upper shielding plane is sandwiched between the lower and upper solder-resist layers. The lower solder-resist layer can at least partially overlap a landing-pad region of a landing-pad via that penetrates a top build-up layer which is contacted by the lower solder-resist layer.