Abstract: Apparatus for reducing a common mode (CM) electromagnetic interference (EMI) in a balanced transmission line which carries a differential signal occupying a specified frequency band is described. The apparatus includes a first Single Ended Filter (SEF) operatively associated with a first path of the balanced transmission line, and a second SEF operatively associated with a second path of the balanced transmission line, wherein a ground terminal of the first SEF and a ground terminal of the second SEF are electrically connected to a local ground. Related apparatus and methods are also described.

Abstract: An electromagnetic interference filter, including a core, having: at least one electrically conductive signal or power-insulated lead, at least one first layer surrounding the lead, made of glass-coated microwire, serving as a magnetic absorbent material, a tubular conductive material surrounding the first layer, and a substrate on which the core is mounted, the substrate is configured as a planar body having a top, a bottom and side surfaces, portions of the top and bottom surfaces are covered with electrically conductive material serving as signal and ground terminals and making electrical contact with the tubular conductive material of the core.

Abstract: An electromagnetic interference filter, including a core, having: at least one electrically conductive signal or power-insulated lead, at least one first layer surrounding the lead, made of glass-coated microwire, serving as a magnetic absorbent material, a tubular conductive material surrounding the first layer, and a substrate on which the core is mounted, the substrate is configured as a planar body having a top, a bottom and side surfaces, portions of the top and bottom surfaces are covered with electrically conductive material serving as signal and ground terminals and making electrical contact with the tubular conductive material of the core.

Abstract: An electro-magnetic interference (EMI) filter assembly comprising of an absorbing layer filled with magnetic material in a form of microwires, metallic ribbons or powder, the magnetic material-filled layer in close proximity to an electrical conductor carrying a common mode noise current superimposed on a functional differential-mode current. The absorbing layer performs the EMI filtering by means of reflection and absorption of high frequency energy of the common mode current due to the high magnetic permeability of the layer's magnetic substance. An appropriate filler compound reinforces the magnetic substance in the magnetic material-filled layer. A circuit laminate which is adjacent to the magnetic material-filled layer supports the electrical conductor(s), to give a basic structure of a PCB filter in which the magnetic material is embedded. Various configurations of the basic filter assembly are described, such as multi-layer filters and optimized transmission lines.