Power circuit (10, 100) suitable for combining or splitting broadband signals, the circuit (10, 100) comprising: a stepped impedance section, a core section and a first, second and third port (11, 12, 13), said stepped impedance section and said core section being interconnected at an interconnection, and where said stepped impedance section comprises the first port and a first transmission line running from said first port to said interconnection, and where said core section comprises the second port and the third port, and a second transmission line running from said interconnection to the second port and a third transmission line running from said interconnection to the third port, and where the second and third transmission lines (31, 32) each have at least a first and a second core subsection (311, 312, 313, 31N, 321, 322, 323, 32N), where the number of core subsections (311, 312, 313, 31N) of the second transmission line and the number of core subsections (321, 322, 323, 32N) of the third transmission line is equal, each core subsection (311, 312, 313, 31N, 321, 322, 323, 32N) having a line impedance, said core subsections (311, 312, 313, 31N, 321, 322, 323, 32N) forming at least two pairs (361, 362, 363, 36N) of core subsections where the first pair of core subsections (311, 312, 313, 31N, 321, 322, 323, 32N) comprises the first core subsection of the second transmission line and the first core subsection of the third transmission line and the second pair of core subsections comprises the second core subsection of the second transmission line and the second core subsection of the third transmission line, and each pair (361, 362, 363, 36N) of core subsections (311, 312, 313, 31N, 321, 322, 323, 32N) comprises resistance means (371, 372, 373, 37N) connecting the core subsections, characterised in that the first transmission line comprises at least two stepped impedance subsections (251, 252, 253, 25N), each stepped impedance subsection (251, 252, 253, 25N) having a line impedance, and where the line impedances of the at least two stepped impedance subsections (251, 252, 253, 25N) differs, and in that, the line impedances of each core subsection (311, 312, 313, 31N, 321, 322, 323, 32N) of said second and third transmission lines (31, 32) are equal, and the resistance of each of the resistance means (371, 372, 373, 37N) connecting said second and third transmission lines (31, 32) in each pair (361, 362, 363, 36N) of core subsections (311, 312, 313, 31N, 321, 322, 323, 32N) differs, and in that the number of stepped impedance subsections (251, 252, 253, 25N) of the stepped impedance section is equal to the number of pairs (361, 362, 363, 36N) of core subsections (311, 312, 313, 31N, 321, 322, 323, 32N) of the core section, and in that the resistances of the resistance means (371, 372, 373, 37N) of the core section decreases from the second and third ports (12, 13) towards the interconnection.. the first transmission line comprises at least two stepped impedance subsections (251, 252, 253, 25N), each stepped impedance subsection (251, 252, 253, 25N) having a line impedance, and where the line impedances of the at least two stepped impedance subsections (251, 252, 253, 25N) differs, and in that, the line impedances of each core subsection (311, 312, 313, 31N, 321, 322, 323, 32N) of said second and third transmission lines (31, 32) are equal, and the resistance of each of the resistance means (371, 372, 373, 37N) connecting said second and third transmission lines (31, 32) in each pair (361, 362, 363, 36N) of core subsections (311, 312, 313, 31N, 321, 322, 323, 32N) differs, and in that the number of stepped impedance subsections (251, 252, 253, 25N) of the stepped impedance section is equal to the number of pairs (361, 362, 363, 36N) of core subsections (311, 312, 313, 31N, 321, 322, 323, 32N) of the core section, and in that the resistances of the resistance means (371, 372, 373, 37N) of the core section decreases from the second and third ports (12, 13) towards the interconnection..