A developmental voltage–tunable microwave magnetron

The paper concerns the results of design and performance of a low power coaxially interdigital magnetron with external coupled cavity. Special attention is given to the problem of wide-range tunability, in the microwave frequency spectrum, using either mechanical or voltage-tuning methods. The basic structure of the magnetron consists of a short, hermetically-sealed section of coaxial transmission line which contains six equally spaced radial vanes extending from the inner wall of the outer coaxial cylinder into six longitudinal slots in the inner coaxial cylinder. The cathode is symmetrically located within the inner coaxial cylinder at the position of the multianode structure. This sealed off multi-anode system is used to excite a TEM mode in an external coaxial circuit. Experimental results on electronically and mechanically tunable operation are reported, with particular emphasis on voltage tuning.