Wave transmission lines and networks – Coupling networks – With impedance matching
Reexamination Certificate
2006-08-08
2006-08-08
Jones, Stephen E. (Department: 2817)
Wave transmission lines and networks
Coupling networks
With impedance matching
C333S004000, C333S012000
Reexamination Certificate
active
07088200
ABSTRACT:
A method and structure are provided to control common mode impedance in fan-out regions for printed circuit board applications. A differential pair transmission line includes a narrow signal trace portion in the fan-out region and a wider signal trace portion outside of the fan-out region. A dielectric material separates the differential pair transmission line from a reference power plane. A thickness of the narrow signal trace is increased and a thickness of the dielectric material is correspondingly decreased in the fan-out region.
REFERENCES:
patent: 6677831 (2004-01-01), Cheng et al.
Bartley Gerald Keith
Becker Darryl John
Dahlen Paul Eric
Germann Philip Raymond
Maki Andrew B.
International Business Machines - Corporation
Jones Stephen E.
Pennington Joan
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