Patent ID: 6707366
Filing Date: 2004-03-16
Classification: H01F

Abstract:
A filtering induction device, comprising:a first flat coil formed by winding a first conductive strip to form a spiral having a plurality of circles, wherein the circles each have a first radius and are arranged layer by layer, wherein the first conductive strip has a first upper surface and a first lower surface, wherein the first conductive strip is covered with an isolation material and the first flat coil is used as an inductor; a second flat coil formed by winding a second conductive strip to form a spiral having a plurality of circles, wherein the circles each have a second radius and are arranged layer by layer, wherein each of the circles of the second conductive strip is wound between the first upper surface and the first lower surface, to serve as a capacitor; and a core structure coupled to the first flat coil and the second flat coil.