Some Aspects of Split-Anode Magnetron Operation

Tests of split-anode magnetrons used with butterfly resonators have shown that resonators and tubes at present available are not suitable for use In wide-band butterfly magnetron oscillators, but that such oscillators might have desirable characteristics in some applications if the tubes and resonators were designed for the purpose. Oscillographic studies appear to indicate that negative slope of portions of the anode current-voltage characteristics can be explained on the basis of back-heating and that negative slope is absent when the current is varied rapidly. A comparison of various methods of anode-current stabilization showed that smoothest operation is obtained if the magnetic field is produced by an electromagnet excited by the direct anode current.