Wave transmission lines and networks – Long lines – Strip type
Reexamination Certificate
1998-12-15
2001-07-31
Pascal, Robert (Department: 2817)
Wave transmission lines and networks
Long lines
Strip type
C333S246000
Reexamination Certificate
active
06268783
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a printed circuit board suitably used for transmitting high frequency signals therethrough.
2. Description of the Related Art
In a prior art printed circuit board, in order to suppress the generation of noise in signal transmission lines, one or more terminating resistors are connected to each of the signal transmission lines (see JP-A-6-35582).
In the above-mentioned prior art printed circuit board, particularly, for high frequency signals, however, since the number of terminating resistors is increased and the area of the printed circuit board is limited, such terminating resistors cannot completely be provided in the printed circuit board, so that they are insufficient to suppress the generation of noise.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a printed circuit board capable of suppressing the generation of noise without terminating resistors.
According to the present invention, in a printed circuit board including a signal transmission line, the signal transmission line is formed by first, second and third connection patterns connected in series, and the width of the second connection pattern is smaller than that of the first and third connection patterns.
Also, in a printed circuit board including a signal transmission line, the signal transmission line is formed by first, second and third connection patterns connected in series, and the thickness of the second connection pattern is smaller than that of the first and third connection patterns.
Thus, the second connection pattern serves as a terminating resistor of the prior art printed circuit board.
Further, in a printed circuit board including a signal transmission line having a stub section, the width of the stub section is smaller than that of the transmission line other than the stub section.
Additionally, in a printed circuit board including a signal transmission line having a stub section, the thickness of the stub section is smaller than that of the transmission line other than the stub section.
Thus, the stub section serves as a terminating resistor of the prior art printed circuit board.
REFERENCES:
patent: 4090155 (1978-05-01), Tateno et al.
patent: 5473281 (1995-12-01), Honjo
patent: 3-253923 (1991-11-01), None
patent: 404288702 A (1992-10-01), None
patent: 6-35582 (1994-02-01), None
Glenn Kimberly E
NEC Corporation
Pascal Robert
Sughrue Mion Zinn Macpeak & Seas, PLLC
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