Patent ID: 8165283

Claim:
A telecommunication filter arrangement comprising: at least a first filter cell and a second filter cell coupled in cascade between a first filter arrangement port and a second filter arrangement port, each filter cell comprising a transformer of which each winding is coupled in parallel with a resistor, the transformer of each of said first and second filter cell comprises a first winding coupled in parallel with a first resistor and a second winding coupled in parallel with a second resistor, said first filter arrangement port includes a first filter arrangement terminal and a second filter arrangement terminal, said second filter arrangement port includes a third filter arrangement terminal and a fourth filter arrangement terminal, said first filter arrangement terminal is coupled to said third filter arrangement terminal via the series coupling of the first windings of the transformers of said first and second filter cells, and said second filter arrangement terminal is coupled to said fourth filter arrangement terminal via the series coupling of the second windings of the transformers of said first and second filter cells, and wherein said telecommunication filter arrangement further includes a third filter cell coupled between said first and said second filter cell, said third filter cell is coupled between the first windings of the transformers of said first and second filter cells, and the second windings of the transformers of said first and second filter cells, and said third filter cell includes a cell capacitor series coupled with the parallel connection of a cell winding and a cell resistor.