Abstract: In a magnetron apparatus and a manufacturing method of the present invention, the magnetron apparatus comprises an anode cylinder, and a plurality of plate-form anode segments radially arranged around a central axis of the anode cylinder inside the anode cylinder. The anode segments are pressed against an inner surface of the anode cylinder by a pin press-fit into the central portion of the anode cylinder, and a far-end-side end surface each of the anode segments is secured to the inner surface. A concave is provided in the central portion of an inner end surface where the anode segments come into contact with the pin.

Abstract: A high voltage noise filter for use in magnetron devices comprises a coil of a conductive wire coated with an insulating layer and another coil of the conductive wire with a conductive layer formed on the insulating layer, the two coils connected to each other in series A joint portion of the two coils has a triple-layered structure wherein a high withstand voltage layer either of a semiconductive or insulative member is formed in the vicinity of an end portion of the conductive layer, as interposed between the outer peripheral surface of the insulating layer and the conductive layer.