Time domain analysis of noises generated from microwave oven magnetron

Mitani, Tomohiko; Shinohara, Naoki; Matsumoto, Hiroshi; Aiga, M.; Kuwahara, N.; Handa, Takanori

doi:10.1002/ecjb.20169

Cited by 4 publications

(1 citation statement)

References 6 publications

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“…From the time-domain measurements of the magnetron noise in the fundamental frequency bands [17], the sideband noises below 2.45 GHz are generated at the startup and in a low anode-current region, when the electron spokes are about to be formed and synchronized with the RF field. Hence, the circulating frequency of the electrons in the interaction space at these stages is also expressed by (3).…”

Section: A Sideband Noise In the Fundamental Bandsmentioning

confidence: 99%

Noise-Reduction Effects of Oven Magnetron With Cathode Shield on High-Voltage Input Side

Mitani

Shinohara

Matsumoto

et al. 2006

IEEE Trans. Electron Devices

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A magnetron with a metallic cathode shield on the high-voltage (HV) input side is newly designed for the purpose of reducing the spurious noise generated from an oven magnetron. In this paper, it was experimentally found that the newly designed magnetron suppressed the sideband noise around the carrier frequency up to 10 dB, compared to the conventional magnetron. Moreover, both the spurious noise in the high frequency bands (4-14 GHz) and the line noise in the low frequency bands (∼ 1 GHz) from the newly designed magnetron were reduced up to 30 dB, compared to the conventional one. It was also found that a cathode shield attached to only the HV input side was more effective than the cathode shields attached to both the HV input side and the RF output side, with respect to the noise reduction. The thermionic emission from the cathode filament and the motions of the electrons in a magnetron are discussed in investigating the noise-reduction mechanisms.

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Section: A Sideband Noise In the Fundamental Bandsmentioning

confidence: 99%