Wave transmission lines and networks – Plural channel systems
Reexamination Certificate
2007-09-05
2010-02-09
Lee, Benny (Department: 2817)
Wave transmission lines and networks
Plural channel systems
C333S246000
Reexamination Certificate
active
07659791
ABSTRACT:
Provided is a guard trace pattern reducing far-end crosstalk and a printed circuit board having the guard trace pattern. The guard trace pattern includes a first guard trace pattern parallel with two signal lines and a plurality of second guard trace patterns perpendicular to the first guard trace pattern to increase mutual capacitance between the two signal lines and the guard trace pattern and increase mutual capacitance between the two signal lines. The printed circuit board includes the aforementioned guard trace pattern disposed between micro strip transmission lines. A characteristic impedance of the guard trace pattern is different from a characteristic impedance of the micro strip transmission lines, and resistances having the same value as a resistance component value of the characteristic impedance of the guard trace pattern are provided to both ends of the guard trace pattern.
REFERENCES:
patent: 5675298 (1997-10-01), Bhagwan et al.
patent: 6380818 (2002-04-01), Lee
patent: 6433648 (2002-08-01), Lee
patent: 6914502 (2005-07-01), Otsuka et al.
patent: 2007/0236303 (2007-10-01), Lee et al.
Jung Hae Kang
Lee Kyoung Ho
Park Hong June
Kile Goekjian Reed & McManus
Lee Benny
Park Jae Y.
Postech Foundation & Postech Academy Industry Foundation
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