The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 28, 2019
Filed:
May. 22, 2018
Fujitsu Limited, Kawasaki-shi, Kanagawa, JP;
Taiga Fukumori, Isehara, JP;
FUJITSU LIMITED, Kawasaki, JP;
Abstract
A circuit board includes an insulation layer, a signal line formed over the insulation layer and extending in a direction X, and a conductor layer formed under the insulation layer. The insulation layer has periodic dielectric-constant distribution in a direction Y orthogonal to the direction X. The conductor layer includes a slit at a position corresponding to the signal line. The slit expands an electric field produced between the signal line and the conductor layer; causes less difference in dielectric constants of the insulation layer in the vicinity of the signal line (the difference is caused by the positional relationship between the signal line and the dielectric-constant distribution of the insulation layer); and reduces difference in signal transmission speeds caused by the positional relationship.