A study of magnetron noise

Yamamoto, Kosuke; Kuronuma, H.; Koinuma, T.; Tashiro, N.

doi:10.1109/t-ed.1987.23071

Cited by 18 publications

(12 citation statements)

References 3 publications

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“…2 , 3 Since these communication systems occupy the same region of the microwave spectrum utilized by microwave ovens, there exists an increasing concern about interference from noisy magnetrons [1], [2]. Also, Manuscript the noise radiated by an oven magnetron may interfere with television broadcasts in the VHF and UHF bands [3]. Understanding the noise generation mechanisms and developing noise suppression techniques for microwave oven magnetrons could potentially be extended to improvement of the performance of military radars, as the excess noise in crossedfield amplifiers ([4]- [8]) may severely limit the signal-to-noise ratio.…”

Section: Introductionmentioning

confidence: 99%

“…Modified designs for cathode geometry were suggested to reduce the noise produced by the microwave oven magnetrons, e.g., the so-called Kumpfer magnetron design [9], involves the fact that the end caps on the cathode are magnetic pole pieces. Other researchers considered magnetron noise reduction by using an ion drain electrode to prevent ion trapping, as they concluded that the noise was mainly due to ions trapped in the vicinity of the cathode [3].…”

Section: Introductionmentioning

confidence: 99%

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Low-Noise Microwave Oven Magnetrons With Fast Start-Oscillation by Azimuthally Varying Axial Magnetic Fields

Neculaes

Gilgenbach

Lau

et al. 2004

IEEE Trans. Plasma Sci.

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A technique has been proven to significantly reduce the noise and to hasten the startup in microwave signals from dc operating oven magnetrons. The technique is based on imposition of an azimuthally varying axial magnetic field in magnetrons. For an -cavity magnetron operating in pi-mode, the optimal number of periods of azimuthal variations in the axial magnetic field is 2. This technique demonstrates the fastest startup and lowest start-oscillation current by prebunching the electrons. Measurements show dramatic reduction in noise of 600-800 W oven magnetrons operating dc near 2.45 GHz. The sidebands are eliminated ( 30 dB) and the noise within 50 MHz from the carrier is reduced by 30 dB. Noise reduction is observed at low (up to 60 mA), medium (60-200 mA) and high currents (200-300 mA), for both aged and fresh oven magnetrons. The reduction in power and in electronic efficiency is of order of 10%, in this low-noise, fast startup operation.Index Terms-High power microwaves, magnetron, microwave noise.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Low-Noise Microwave Oven Magnetrons With Fast Start-Oscillation by Azimuthally Varying Axial Magnetic Fields

Neculaes

Gilgenbach

Lau

et al. 2004

IEEE Trans. Plasma Sci.

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“…1.3. These vortices are also regions of potential minima, providing opportunities for ion trapping and the associated noise mechanisms (Yamamoto, et al, 1987).…”

Section: Discovery Of Vortex Structures In Magnetronsmentioning

confidence: 99%

Coherent Structures and Chaos Control in High-Power Microwave Devices

Nachman¹,

Chen²

2006

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The public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing the burden, Chen, 2003). In particular, we conducted vigorous theoretical and computational investigations of coherent structures and chaos in a wide range of intense electron beam plasmas relevant to the development of high-power microwave sources for directed energy applications. The following is a brief summary of our research accomplishments in selected areas, while detailed findings are described in the preprints cited in this report. SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES) 10. SPONSOR/MONITOR'S ACRONYM(S)Air SUBJECT TERMS

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“…Defining the phase error at the comparison frequency on the phase frequency detector of the ADF4113 as then (2) where is the angular frequency of the 10 MHz reference, is the division ratio for the reference, is the phase of the signal from the magnetron and is the division ratio for the magnetron signal.…”

Section: Model For Pll Performancementioning

confidence: 99%

Noise Performance of Frequency- and Phase-Locked CW Magnetrons Operated as Current-Controlled Oscillators

Tahir

Dexter

Carter

2005

IEEE Trans. Electron Devices

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Abstract-Low-power continuous wave "cooker" magnetrons driven from industrial-quality switch-mode power supplies have been frequency locked by driving them as current-controlled oscillators in a phase-lock loop (PLL). The noise performance of these frequency-locked oscillators is reported as a function of heater power.The injection of 30-to 40-dB signals derived from the reference oscillator of the PLL into the magnetron's output waveguide while the anode current is controlled by the PLL is shown to phase lock the magnetron's output. Results for locking performance are presented.

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A study of magnetron noise

Cited by 18 publications

References 3 publications

Low-Noise Microwave Oven Magnetrons With Fast Start-Oscillation by Azimuthally Varying Axial Magnetic Fields

Low-Noise Microwave Oven Magnetrons With Fast Start-Oscillation by Azimuthally Varying Axial Magnetic Fields

Coherent Structures and Chaos Control in High-Power Microwave Devices

Noise Performance of Frequency- and Phase-Locked CW Magnetrons Operated as Current-Controlled Oscillators

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