Patent ID: 7999633
Filing Date: 2011-08-16
Classification: H03H

Abstract:
1. An EMI (electromagnetic interference) filter with integrated inductors and capacitors realized using at least one flexible printed circuit (FPC), comprising: a closed magnetic circuit, formed by a first magnetic core and a second magnetic core, comprising a plurality of magnetic core pillars; at least one of the plurality of magnetic core pillars being wound with the at least one FPC, being a multi-layer serially connected FPC, wherein the at least one FPC is formed by laminating a top insulating layer, 2N copper-foil layers, 2N−1 insulating medium layers, and a bottom insulating layer, wherein N is a positive integer, one of the insulating medium layers is placed between every two neighboring copper-foil layers of the 2N copper-foil layers, and odd-numbered copper-foil layers of the 2N copper-foil layers are connected to each other on their head and tails ends, respectively, while even-numbered copper-foil layers of the 2N copper-foil layers are connected to each other on their head and tails ends, respectively.