Patent ID: 6600404
Filing Date: 2003-07-29
Classification: H01F,H05K

Abstract:
A planar coil comprising:an insulating substrate; and a coil conductive filament having a thickness of 20 to 400-&mgr;m and formed on at least one surface of said insulating substrate, said coil conductive filament having a gap whose aspect ratio (H/G) is at least 1; wherein said coil conductive filament has a cross-section in a substantially mushroom shape having a neck and a substantially quadrilateral head formed on said neck, said substantially quadrilateral head has a width (L) which is at least twice as large as a width (l) of said neck thereof, at most 1.5 times as large as a height of said substantially quadrilateral head, and at least twice as large as a minimum spacing (G) between adjacent coil conductive filaments.