Seamless-type flexible waveguide for traveling-wave tube

The utility model discloses a seamless-type flexible waveguide for a traveling-wave tube, and the waveguide is characterized in that the waveguide comprises a circular flexible waveguide pipe (1), a positive flange (2), and a negative flange (3); two ends of the circular flexible waveguide pipe (1) are respectively provided with the positive flange (2) and the negative flange (3) through welding; the circular flexible waveguide pipe (1) is a thin-wall corrugated brass tube, wherein the characteristics of the internal surface of the circular flexible waveguide pipe (1) and the pitch diameter of the circular flexible waveguide pipe (1) respectively meet specific function relations. The waveguide is simple in structure, is low in machining cost, employs a seamless smooth-wall tube to make a corrugated pipe, and solves a problem that the surface resistance of the corrugated pipe is small, the problem of high thermal loss of high-power transmission, and a problem of mutual unification of electric parameters with mechanical parameters.