18703347. DIELECTRIC SHEET, SUBSTRATE FOR HIGH FREQUENCY PRINTED WIRING BOARD, AND HIGH FREQUENCY PRINTED WIRING BOARD (SUMITOMO ELECTRIC INDUSTRIES, LTD.)
Contents
DIELECTRIC SHEET, SUBSTRATE FOR HIGH FREQUENCY PRINTED WIRING BOARD, AND HIGH FREQUENCY PRINTED WIRING BOARD
Organization Name
SUMITOMO ELECTRIC INDUSTRIES, LTD.
Inventor(s)
Takashi Ninomiya of Osaka (JP)
Motohiko Sugiura of Osaka (JP)
DIELECTRIC SHEET, SUBSTRATE FOR HIGH FREQUENCY PRINTED WIRING BOARD, AND HIGH FREQUENCY PRINTED WIRING BOARD
This abstract first appeared for US patent application 18703347 titled 'DIELECTRIC SHEET, SUBSTRATE FOR HIGH FREQUENCY PRINTED WIRING BOARD, AND HIGH FREQUENCY PRINTED WIRING BOARD
Original Abstract Submitted
A dielectric sheet includes a polytetrafluoroethylene and spherical inorganic fillers, wherein a mass ratio of the inorganic fillers to the polytetrafluoroethylene is 1.3 or more, the inorganic fillers have an average particle diameter of 0.3 μm to 4.0 μm, and the inorganic fillers include a silica filler. Part of the polytetrafluoroethylene is present in the form of a plurality of fibrous bodies, and in a SEM image of a surface of the dielectric sheet after a 180-degree peel test, at least part of fibrous bodies among the plurality of fibrous bodies has areas with a thickness of 0.1 μm to 3.0 μm and a length of 50 μm to 5000 μm, and an average space between the areas of the at least part of fibrous bodies is 10 μm or less.
