the three magnetic core pillar is wound by a tubular multi layer serially connected fpc 3 fig2 illustrated integrated common mode inductors and differential mode capacitors in a second embodiment of the present invention which include a closed magnetic circuit that consists of a first magnetic core 1 and a second magnetic core 2 the first magnetic core 1 and the second magnetic core 2 are both of a u201c u u201d shape in fig2 to form a closed magnetic circuit of two magnetic core pillars in an alternate embodiment one of the magnetic cores can be of a u201c u u201d shape while the other is of an u201c i u201d shape so as to form another closed magnetic circuit of two magnetic core pillars each magnetic core pillar is wound with a respective tubular multi layer serially connected fpc 3 referring to fig3 the integrated structure of inductors and capacitors in the emi filter realized by a flexible circuit board according to a third embodiment of the present invention comprises a closed magnetic circuit of a tri pillar magnetic core formed by a first magnetic core 1 and a second magnetic core 2 in the example shown the first magnetic core 1 and the second magnetic core 2 are both in e shape but it is also possible that one of them is in e shape and the other.