The reflex magnetron, a UHF oscillator having voltage-controlled frequency and pushing characteristics

This paper describes a new type of magnetron in which reflex action of portions of the space-charge spokes controls the operating frequency as a function of the magnetron current. In this reflex magnetron, the resonant structure and the cathode are concentrically positioned and have different potentials. A magnet field is provided parallel to the axes of the cathode to produce magnetron action. An electrode positioned in the space outside the vane tips of the magnetron causes portions of the space-charge spokes to pass into this outer space and then return, or be reflexed, to the vane tips where they are collected. The electrons which enter the outer space change angular velocity with respect to the angular velocity of the electrons in the spokes. Consequently, when these electrons return to the vane tips, they change or control the frequency of the oscillations.