Patent ID: 8314664

Claim:
An asymmetrical single-section coupler with microstrip lines comprising a dielectric substrate, a main line and a secondary line comprising a coupling section, the lines being deposited on the substrate, wherein the main line is substantially rectilinear and uniform over its entire length, wherein the coupling section comprises a coupling protuberance at each of its ends, the protuberances being interlinked by a portion of conductive line of which the section, the shape and the disposition are adapted to minimize the coupling between said portion and the main line relative to the coupling made between the protuberances and the main line, and wherein at least one first resistive balancing element is connected to the first protuberance and at least one second resistive element is connected to the second protuberance, the first and second resistive elements having different impedance values in order to optimize the directivity of the single-section coupler.