Patent ID: 9635761
Date: 2017-04-25
CPC Classifications: H05K,Y10T

Claim:
1. A printed circuit board, comprising: a plurality of layers, stacked on top of one another, comprising two outer layers and at least one interior ground layer disposed between said outer layers; and a via passing through at least two of said layers, wherein said via comprises: an annular metal sleeve disposed around an inner circumference of said via; a conductive path disposed in said via connecting a first signal trace on a first layer of said plurality of layers to a second signal trace disposed on a second layer of said plurality of layers; and an insulating material disposed in said via between said annular metal sleeve and said conductive path, wherein said annular metal sleeve extends from said first layer to said second layer, is in physical contact with and is electrically connected to said at least one interior ground layer, and comprises a first notch, disposed near said first layer, to allow said first signal trace to connect to said conductive path and a second notch, disposed near said second layer, to allow said second signal trace to connect to said conductive path, and wherein a ratio of a diameter of the annular metal sleeve to a diameter of the conductive path and a dielectric constant of the insulating material define an impedance of the via and are dimensioned such that the impedance of the via matches an impedance of the first and second signal traces.