Electricity: electrical systems and devices – Housing or mounting assemblies with diverse electrical... – For electronic systems and devices
Reexamination Certificate
2005-08-30
2005-08-30
Vigushin, John B. (Department: 2841)
Electricity: electrical systems and devices
Housing or mounting assemblies with diverse electrical...
For electronic systems and devices
C361S794000, C174S255000, C174S262000
Reexamination Certificate
active
06937480
ABSTRACT:
A printed wiring board is provided which can be applied even to circuit boards operating at high speed, and which can suppress electromagnetic wave radiation, and which can suppress a deterioration in density of mounting. At the printed wiring board, a first signal wire layer, a first ground layer having a first power source wire, a second ground layer having a second power source wire, and a second signal wire layer, are laminated. The first ground layer and the second ground layer are interlayer connected by many via holes. Return current, of signal current flowing through a signal wire, flows in the first ground layer, and a path of the return current is cut midway therealong at a position of the first power source wire. However, the return current is detoured by the via hole to the second ground layer, and flows thereat.
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Brian C. Wadell, “Transmission Line Design Handbook”, Artech House, Inc., 1991, p. 79.
Iguchi Daisuke
Ikeda Kazumi
Ueno Osamu
Wakita Joji
Fuji 'Xerox Co., Ltd.
Oliff & Berridg,e PLC
Vigushin John B.
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