Patent ID: 6097154
Filing Date: 2000-08-01
Classification: H01J

Abstract:
A magnetron for use in a microwave oven, the magnetron comprising:a generally central cathode structure;an anode structure provided around said cathode structure for providing a mutual operation space;a cavity resonator providing a plurality of cavities radially directed toward the cathode;an antenna feeder having an outer diameter .o slashed..sub.1, for transmitting energy in one of said cavities;a body providing a magnetic closed-circuit for applying magnetism into the operational space;a support section having an open portion with an inner diameter .o slashed..sub.4 ; andat least one choke on an inside of said support section to suppress a fifth higher harmonic, the choke surrounding the antenna feeder and having an inner diameter .o slashed..sub.2, an outer diameter .o slashed..sub.3 and a length L.alpha.;wherein the relationship of .o slashed..sub.2 and .o slashed..sub.3 and .o slashed..sub.1 and .o slashed..sub.4, is given by the equation: ##EQU7## wherein a wavelength of harmonic to be suppressed is .lambda.; and wherein a series resonant circuit is provided, the synthetic impedance of which is substantially zero.