Abstract: This invention relates to a magnetron for generating a microwave, in which an upper end shield and a lower end shield for supporting respectively top end and bottom end of a filament, which is a cathode portion, are included, the upper end shield being made in a flange shape having a flat portion of a diameter bigger than an outer diameter of the filament, and a getter for absorbing a generating gas within a vacuum bulb body is mounted on top surface of the upper end shield, and the getter includes a flat portion mounted to the flat portion of the upper end shield and an inclined portion extended downwardly from the end edge of the flat portion so that the electrons generated from the cathode collides and is absorbed.

Abstract: A condenser unit for magnetron comprising a condenser and a mounting plate. The mounting plate is adapted to fixedly mount the condenser to the upper filter box and provided with an elastic periphery member formed as outwardly extending from the periphery of the mounting plate in order to be inclined upwardly at an angle on the basis of plane of the mounting plate. The elastic periphery member comprises a plurality of slender pieces and slits in order to completely elastically cover a gap which is formed between the mounting plate of the condenser unit and the upper filter box. The elastic periphery member and each slit are formed as having a predetermined height and a predetermined width which are fixed as being relatively smaller than or the same with one fourth of crest value and one fourth of wave length of the fifth higher harmonic, respectively. The inclined angle of the periphery member is ranged from about 30.degree.-about 70.degree..