GB617937A - Improvements in or relating to electron discharge devices for use on ultra high frequencies - Google Patents

Abstract

617,937. Magnetrons. MARCONI'S WIRELESS TELEGRAPH CO., Ltd. Aug. 21, 1946, No. 24972. Convention date, Aug. 22, 1945. [Class 39 (i)] In a magnetron having an anode defining a plurality of cavity resonators, adjacent resonators are coupled together by lengths 28 of coaxial line, Fig. 2, or by lengths 28<1> of hollow wave-guide, Fig. 4. The anode block is made. in two parts, each having registering grooves which form the outer walls of the coaxial line or the walls of the wave-guide. The inner conductor of the coaxial line is supported by insulating beads from the outer walls, Fig. 1 (not shown). The coaxial line sections are each (n+¢)# in length and the wave-guide sections n#g in length, where n is any whole number and The cavity resonators may be formed by slots in the anode block, as shown. The ends of the anode block are recessed and covers 22, 23, Fig. 1, or 32, 33, Fig. 4, are silver-brazed to step portions such as 20, 21, Fig. 1. The cathode 10 is indirectly heated and is supported from the anode by insulating discs 16, 17, Fig. 2 ; 43, 44, Fig. 4. Dimensions of the resonators are given in terms of the operating wavelength. In modified constructions, Figs. 5, 6 (not shown), the anode is formed by a sheet metal structure. The invention may also be applied to forms in which the cavity resonators are tubular and communicate with the cathode chamber by slots, or in which radial vanes are mounted within a drum-shaped enclosure. In all forms, the output is taken off by a coupling loop extending - into a coaxial line or through a window into a waveguide. The Specification as open to inspection under Sect. 91 refers to a form in which electrons are directed axially into the central anode chamber from outside. This subject-matter does not appear in the Specification as accepted.