Electricity: conductors and insulators – Conduits – cables or conductors – Preformed panel circuit arrangement
Reexamination Certificate
2007-11-26
2011-11-01
Norris, Jeremy (Department: 2835)
Electricity: conductors and insulators
Conduits, cables or conductors
Preformed panel circuit arrangement
Reexamination Certificate
active
08049118
ABSTRACT:
Printed circuit board in which deterioration of signal transmission characteristics otherwise caused by a stub parasitically formed in a through-hole is suppressed to provide optimum high-speed signal transmission characteristics. A printed circuit board10includes a power supply/ground layer11and a signal line12bin a dielectric layer13, and a through-hole12connected to the signal line12b. A clearance14which becomes an anti-pad is provided in an area between the through-hole12and the power supply/ground layer11. The signal line12bis extended from the through-hole12through the clearance14to an area below the power supply/ground layer11. The portion of the signal line12barranged in the vicinity of the power supply/ground layer11in the clearance14has an area of impedance gradient17whose characteristic impedance becomes progressively lower in a direction away from the through-hole12.
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Japanese Office Action for JP2006-317214 issued Jul. 26, 2011.
NEC Corporation
Norris Jeremy
Willis Tremesha S
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