US Patent No. 10,462,894

CIRCUIT BOARD


Patent No. 10,462,894
Issue Date October 29, 2019
Title Circuit Board
Inventorship Joel R. Goergen, Maple Grove, MN (US)
Yi Zheng, Cold Spring, MN (US)
Assignee Force10 Networks, Inc., San Jose, CA (US)

Claim of US Patent No. 10,462,894

1. A circuit board, comprising:a first board dielectric layer;
a second board dielectric layer that is located adjacent the first board dielectric layer;
a first local dielectric region that is located within the first board dielectric layer and adjacent the second board dielectric layer;
a second local dielectric region that is located within the second board dielectric layer and adjacent at least the first local dielectric region within the first board dielectric layer; and
a pair of differential conductors that are each located within at least one of the first board dielectric layer and the second board dielectric layer, within at least one of the first local dielectric region and the second local dielectric region, such that the pair of differential conductors are positioned immediately adjacent both the first local dielectric region and the second local dielectric region,
wherein the first local dielectric region and the second local dielectric region are configured with dielectric constants that are different than dielectric constants of the first board dielectric layer and the second board dielectric layer such that crosstalk between the pair of differential conductors and a third conductor located within at least one of the first board dielectric layer and the second board dielectric layer is reduced.