Filter arrangement and antenna feeding network for a multi radiator antenna having such a filter arrangement

An antenna feeding network for a multi-radiator antenna, the antenna feeding network comprising at least two elongated outer conductors forming elongated compartments, said at least two elongated outer conductors being formed integrally and in parallel, wherein at least one of the outer conductors is provided with a central inner conductor arranged therein to form at least one substantially air-filled coaxial line, wherein the antenna feeding network comprises a filter arrangement comprising:

• an inner electric conductor comprising at least one inner conductor segment;
• an outer electric conductor at least partly surrounding the inner electric conductor;
• —at least one dielectric element arranged sandwiched between at least one inner conductor segment and the outer conductor to form a capacitance between the outer conductor and the at least one inner conductor segment;
• —at least one coil spring arranged inside said outer conductor to force the at least one inner conductor segment and the at least one dielectric element against the outer conductor, wherein said at least one coil spring is made from an electrically conducting material to form an inductance, and wherein said at least one coil spring is electrically connected with said at least one inner conductor segment,
• wherein the outer electric conductor of the filter arrangement is formed by one of the elongated outer conductors of the antenna feeding network.

A multi-radiator antenna comprising an antenna feeding network and radiating elements being connected to the antenna feeding network, said antenna feeding network comprising at least two elongated outer conductors forming elongated compartments, said at least two elongated outer conductors being formed integrally and in parallel, wherein at least one of the outer conductors is provided with a central inner conductor arranged therein to form at least one substantially air-filled coaxial line, wherein the antenna feeding network comprises a filter arrangement comprising:

• an inner electric conductor comprising at least one inner conductor segment;
• an outer electric conductor at least partly surrounding the inner electric conductor;
• —at least one dielectric element arranged sandwiched between at least one inner conductor segment and the outer conductor to form a capacitance between the outer conductor and the at least one inner conductor segment;
• —at least one coil spring arranged inside said outer conductor to force the at least one inner conductor segment and the at least one dielectric element against the outer conductor, wherein said at least one coil spring is made from an electrically conducting material to form an inductance, and wherein said at least one coil spring is electrically connected with said at least one inner conductor segment,
• wherein the outer electric conductor of the filter arrangement is formed by one of the elongated outer conductors of the antenna feeding network.