A broadband filter for confining or attenuating electromagnetic interference noise from one or more electrical signal sources, said broadband filter comprising: a plurality of filter stages (110, 112) electrically coupled by galvanic or by electromagnetic means to the one or more electrical signal sources for confining or attenuating conducted electromagnetic interference noise wherein the plurality of filter stages further comprise one or more filter components (120, 154); one or more conductive shields electrically coupled by galvanic or by electromagnetic means to the one or more electrica signal sources wherein the one or more conductive shields encapsulate the plurality of the filter stages (110, 112) for confining or attenuating conducted and/or radiated electromagnetic interference noise; and a plurality of conductive partition layers to encapsulate the plurality of filter stages (110, 112) such that the plurality of conductive partition layers electromagnetically couple adjacent filter stages (110, 112) for a first selected frequency range of the electromagnetic interference noise; the broadband filter characterised in that it further comprises one or more additional conductive partition layers placed between and/or around the one or more filter components (120, 154) to electromagnetically couple said one or more filter components for a second selected frequency range of electromagnetic interference noise; and wherein the thickness of each of the plurality of conductive partition layers is progressively increased the further away it is from the one or more electrical signal sources, such that the conductive partition layer attenuating or reflecting electromagnetic interference noise with the highest frequency is located closest to the one or more electrical signal sources. a plurality of filter stages (110, 112) electrically coupled by galvanic or by electromagnetic means to the one or more electrical signal sources for confining or attenuating conducted electromagnetic interference noise wherein the plurality of filter stages further comprise one or more filter components (120, 154); one or more conductive shields electrically coupled by galvanic or by electromagnetic means to the one or more electrica signal sources wherein the one or more conductive shields encapsulate the plurality of the filter stages (110, 112) for confining or attenuating conducted and/or radiated electromagnetic interference noise; and a plurality of conductive partition layers to encapsulate the plurality of filter stages (110, 112) such that the plurality of conductive partition layers electromagnetically couple adjacent filter stages (110, 112) for a first selected frequency range of the electromagnetic interference noise; the broadband filter characterised in that it further comprises one or more additional conductive partition layers placed between and/or around the one or more filter components (120, 154) to electromagnetically couple said one or more filter components for a second selected frequency range of electromagnetic interference noise; and wherein the thickness of each of the plurality of conductive partition layers is progressively increased the further away it is from the one or more electrical signal sources, such that the conductive partition layer attenuating or reflecting electromagnetic interference noise with the highest frequency is located closest to the one or more electrical signal sources.