Abstract: A microwave magnetron-type device comprises an anode assembly or block in the form of a multistage two-dimensional periodic retarding system, including cavities with vanes, each having a lumped inductance portion defined by the vane sidewalls near the vane bases, and straps. The straps are arranged on each stage of the retarding system and pass through windows made in the vanes. Provided in the inductive portion of the cavities of the retarding system is at least one duct with the following ratios:d.sub.1 >d.sub.2 >d.sub.3,d.sub.3 >d.sub.4 >d.sub.5,h.sub.1 .ltoreq.h.sub.2,where d.sub.1 is the distance between the vane ends and the outer surface of the anode assembly, d.sub.2 is the distance between the vane ends and the duct wall adjacent to the outer surface of the anode assembly, d.sub.3 is the distance between the vane ends and the wall of the inductive portion of the cavities, remotest from the vane ends, d.sub.4 is the distance between the vane ends and the opposite duct wall, d.sub.

Abstract: A microwave magnetron-type device comprises at least one anode block with annular metal straps electrically associated with respective vanes of the anode block cavities, having the same polarity at -mode. The straps of different polarities, electrically associating respective vanes of the same polarity, are paired, each pair being arranged with respect to one another along the anode block axis to form a single multistage retardation system. The device also comprises a means for creating a magnetic field directed along the anode block axis enveloping said anode block, and a means for increasing the magnetic field density in direct proximity to the anode block end faces, forming a gap with the end faces of the anode block. At least some of said straps are made at least partically of a magnetic material, and the mass of this material is so distributed along the anode block axis that the magnetic field density varies along the anode block axis as follows: ##EQU1## where B.sub.

Abstract: A microwave device of the magnetron type comprises an anode block with straps which are located with respect to one another along the axis of the block and are electrically connected to respective vanes of resonators of the block, these vanes having like polarity at the .pi.-mode of oscillations. The anode block is provided with cooling channels adapted to cool the vanes of the resonators and straps, said channels communicating with at least one chamber designed to distribute a liquid coolant and with at least one chamber designed to collect the liquid coolant, said chambers being rigidly connected with the anode block and provided with a hydraulic coupling between them. The straps of the anode block are implemented in the form of ring-like tubes.