An impedance control unit, comprising: a pair of re-entrant type coupled lines comprising: a dielectric substrate comprising a first dielectric layer and a second dielectric layer, the first and second dielectric layers each having a first and second side, wherein the second side of the first dielectric layer is facing the first side of the second dielectric layer; a first conductive strip and a second conductive strip spaced apart from the first conductive strip, wherein the first and second conductive strips are electromagnetically coupled; a conductive intermediate plane; and a conductive ground plane; an electrical connection between the conductive intermediate plane and the conductive ground plane, the electrical connection comprising a conductive via at a position of a virtual ground for odd mode signal propagation; wherein the conductive ground plane is arranged on the second side of the second dielectric layer, and wherein the first and second conductive strips are arranged on the first or second side of the first dielectric layer and wherein the intermediate conductive plane is arranged on the second or first side of the first dielectric layer, respectively; and wherein the conductive intermediate plane laterally extends beyond the first and second conductive strips; characterized in that a dielectric constant of the first dielectric layer is substantially greater than a dielectric constant of the second dielectric layer and/or that a thickness of the first dielectric layer is substantially less than a thickness of the second dielectric layer, wherein the electrical connection is configured to provide a local disturbance for the propagation of even mode signals that resembles a capacitor between the strips and the grounded intermediate layer acting as an RF short at RF frequencies. a pair of re-entrant type coupled lines comprising: a dielectric substrate comprising a first dielectric layer and a second dielectric layer, the first and second dielectric layers each having a first and second side, wherein the second side of the first dielectric layer is facing the first side of the second dielectric layer; a first conductive strip and a second conductive strip spaced apart from the first conductive strip, wherein the first and second conductive strips are electromagnetically coupled; a conductive intermediate plane; and a conductive ground plane; a dielectric substrate comprising a first dielectric layer and a second dielectric layer, the first and second dielectric layers each having a first and second side, wherein the second side of the first dielectric layer is facing the first side of the second dielectric layer; a first conductive strip and a second conductive strip spaced apart from the first conductive strip, wherein the first and second conductive strips are electromagnetically coupled; a conductive intermediate plane; and a conductive ground plane; an electrical connection between the conductive intermediate plane and the conductive ground plane, the electrical connection comprising a conductive via at a position of a virtual ground for odd mode signal propagation; wherein the conductive ground plane is arranged on the second side of the second dielectric layer, and wherein the first and second conductive strips are arranged on the first or second side of the first dielectric layer and wherein the intermediate conductive plane is arranged on the second or first side of the first dielectric layer, respectively; and wherein the conductive intermediate plane laterally extends beyond the first and second conductive strips; characterized in that a dielectric constant of the first dielectric layer is substantially greater than a dielectric constant of the second dielectric layer and/or that a thickness of the first dielectric layer is substantially less than a thickness of the second dielectric layer, wherein the electrical connection is configured to provide a local disturbance for the propagation of even mode signals that resembles a capacitor between the strips and the grounded intermediate layer acting as an RF short at RF frequencies.