PURPOSE: A magnetron is provided to enable an oscillation frequency to generate several noise frequencies including a fundamental frequency distributed around the fundamental frequency at the same time through the action a through-hole and a recessed part to form noise waves. CONSTITUTION: A number of anode vanes(2) are arranged radially around a cathode filament(1). The anode vanes form a resonant cavity. The anode vane is attached to an anode cylinder(3) or is formed in a body with the anode cylinder. A pair of anode vanes comprises 'V'-shaped recessed parts(2v, 2'v) to form a noise wave. The pair of anode vanes comprises a through-hole to form the noise wave.
