Patent ID: 9560741
Date: 2017-01-31
CPC Classifications: H05K

Claim:
1. A circuit board, comprising: a plurality of layers; first and second reference conductive vias extending in a vertical direction through at least a portion of the plurality of layers; first and second signal conductive vias extending in the vertical direction between and spaced apart in a horizontal direction from the first and second reference conductive vias through at least a portion of the plurality of layers, a topmost layer being padless about at least one of the first and second signal conductive vias, an intermediate layer between the topmost layer and a bottommost layer of the plurality of layers including a pad about the at least one of the first and second signal conductive vias; a dielectric region extending in the vertical direction between the first and second signal conductive vias; an air via extending in the vertical direction through the dielectric region between the first and second signal conductive vias; and an anti-pad extending in the horizontal direction between the first and second reference conductive vias and surrounding in the horizontal direction the padless topmost layer of the first and second signal conductive vias, the air via, and the dielectric region.