The invention discloses a phase-measuring device and identification method to entrance Tokamak low clutter antenna phase. That is to connect a dual directional coupler respectively at the root of every klystron output waveguide transmission line and near the antenna. Each dual directional coupler microwave signal is separated into two parts through filter and two straight power splitters respectively access Module A, B input. Phase two modules used to work, A module will phase output phase voltage curves of the same phase of the two phase corresponding phase combined output phase voltage module B identify a phase value. The invention measures and phases out amount of regulation quickly and accurately when Tokamak system sends the 2.45 GHz microwave signal to antenna phase entrance, provides accurate feedback phase of the phase control, provide a reliable technical support for studying microwave plasma coupling efficiency. |