Sealing structures for the output portions of magnetrons

In the sealing structure for the output portion of a magnetron of the type wherein the output portion is sealed to a support for the magnetron, said output portion including an antenna for supplying microwave energy to a load and an insulator for insulating said antenna from a base portion for said antenna constituting a part of the magnetron, the improvement wherein said support for the magnetron comprises a plate member with a annular bent portion formed about an opening at the central area of said plate member, said bent portion being provided with a plurality of axial slits, said base portion for said antenna comprising a pedestal which includes a cylindrical portion of a larger diameter than said insulator and a second plate member having an opening of a diameter approximately equal to the inner diameter of said insulator, the upper end of said cylindrical portion being integrally fixed to said second plate member, the lower end of said cylindrical portion being fixed to an element adjacent to the output portion of the magnetron, said base portion for said antenna being in electrical and mechanical contact with said annular bent portion.