US Patent No. 10,117,326

COMMUNICATION DEVICE


Patent No. 10,117,326
Issue Date October 30, 2018
Title Communication Device
Inventorship Yohei Shirakawa, Hitachi (JP)
Koki Hirano, Hitachinaka (JP)
Yoshitake Ageishi, Hitachi (JP)
Yuki Haga, Takahagi (JP)
Assignee HITACHI METALS, LTD., Tokyo (JP)

Claim of US Patent No. 10,117,326

1. A communication device, comprising:a connector connected to a communication cable including multiple pairs of signal lines for transmitting a differential signal; and
a plurality of pairs of transmission lines for transmitting the differential signal inputted/outputted through the connector,
wherein a number of the pairs of the transmission lines is an even number N that is greater than 2, each pair of the transmission lines comprises N?1 stages of sub-transmission lines generating a same amount of crosstalk as an amount of crosstalk caused at the connector, and N?1 stages of connecting portions comprising a first stage connecting portion to connect a transmission path of the connector and a first stage of the N?1 stages of sub-transmission lines by a corresponding straight or cross type connection, and second to N?1 th stage connecting portions to connect an i th stage of the N?1 stages of sub-transmission lines and an i+1 th stage of the N?1 stages of sub-transmission lines by a corresponding straight or cross type connection, where i=an integer from 1 to N?2, and
wherein each pair of transmission lines has a different number of the connecting portions having the cross connection, and as a j th stage of the N?1 connecting portions in any one pair of the plurality of the pairs of transmission lines has a cross connection, a j th stage of the N?1 connecting portions in any other pair of the transmission lines also has a cross connection, where j=an integer from 1 to N/2.