Suitable for the flexible connection of waveguide feeders, the soft waveguide products are divided into three categories: rectangular interlocking, rectangular seamless and elliptical. The frequency range covers 1.72-40ghz. The rectangular interlocking soft waveguide has the function of bending and torsion of E plane and H plane. The rectangular seamless soft waveguide has the characteristics of low loss and good air tightness. Plane E and plane H can be bent but not torsion. Elliptical soft waveguide has the characteristics of low attenuation, small standing wave and low cost. Maximum average power at 40GHz is 150W.