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2.4-GHz-Band High-Power and High-Efficiency Solid-State Injection-Locked Oscillator.

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Title: 2.4-GHz-Band High-Power and High-Efficiency Solid-State Injection-Locked Oscillator.
Authors: Ikeda, Hikaru, Itoh, Yasushi
Source: IEEE Transactions on Microwave Theory & Techniques. Jul2018, Vol. 66 Issue 7, p3315-3322. 8p.
Subjects: Injection locked oscillators, Electronic amplifiers, Microwave generation, Phase-locked loops, Microwave ovens, Metal oxide semiconductors, Gallium nitride
Abstract: There is increasing research interest in the development of solid-state devices to provide intelligent uniform heating, spot heating, and so on. However, the use of the solid-state devices to realize the same 1-kW output power as a conventional microwave oven requires configuration complexity that, for the moment, prevents its wider adoption. Although there is a demand for microwave generators with average output power of several tens to several hundreds of watts, existing solid-state solutions cannot produce this level of power. These problems prompted us to investigate, both by analysis and prototyping, small injection-locked oscillators that use high-efficiency microwave generators to provide several hundred watts of output power. Using an imbalanced coupling resonator in the feedback circuit, we were able to achieve an output power of 210 W and an efficiency of 51% at 2.45 GHz, when injecting a reference signal at a level of less than 1/10 000 of the output power. The high-power and high-efficiency solid-state injection-locked oscillators described in this paper have the advantages of long life, tunable frequency and phase, and low-voltage operation. These characteristics are potentially useful for realizing precise temperature control in chemical reactions, as well as spot and uniform heating by microwave ovens. [ABSTRACT FROM AUTHOR]
Copyright of IEEE Transactions on Microwave Theory & Techniques is the property of IEEE and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: 2.4-GHz-Band High-Power and High-Efficiency Solid-State Injection-Locked Oscillator.
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  Data: <searchLink fieldCode="AR" term="%22Ikeda%2C+Hikaru%22">Ikeda, Hikaru</searchLink><br /><searchLink fieldCode="AR" term="%22Itoh%2C+Yasushi%22">Itoh, Yasushi</searchLink>
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  Data: <searchLink fieldCode="DE" term="%22Injection+locked+oscillators%22">Injection locked oscillators</searchLink><br /><searchLink fieldCode="DE" term="%22Electronic+amplifiers%22">Electronic amplifiers</searchLink><br /><searchLink fieldCode="DE" term="%22Microwave+generation%22">Microwave generation</searchLink><br /><searchLink fieldCode="DE" term="%22Phase-locked+loops%22">Phase-locked loops</searchLink><br /><searchLink fieldCode="DE" term="%22Microwave+ovens%22">Microwave ovens</searchLink><br /><searchLink fieldCode="DE" term="%22Metal+oxide+semiconductors%22">Metal oxide semiconductors</searchLink><br /><searchLink fieldCode="DE" term="%22Gallium+nitride%22">Gallium nitride</searchLink>
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  Label: Abstract
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  Data: There is increasing research interest in the development of solid-state devices to provide intelligent uniform heating, spot heating, and so on. However, the use of the solid-state devices to realize the same 1-kW output power as a conventional microwave oven requires configuration complexity that, for the moment, prevents its wider adoption. Although there is a demand for microwave generators with average output power of several tens to several hundreds of watts, existing solid-state solutions cannot produce this level of power. These problems prompted us to investigate, both by analysis and prototyping, small injection-locked oscillators that use high-efficiency microwave generators to provide several hundred watts of output power. Using an imbalanced coupling resonator in the feedback circuit, we were able to achieve an output power of 210 W and an efficiency of 51% at 2.45 GHz, when injecting a reference signal at a level of less than 1/10 000 of the output power. The high-power and high-efficiency solid-state injection-locked oscillators described in this paper have the advantages of long life, tunable frequency and phase, and low-voltage operation. These characteristics are potentially useful for realizing precise temperature control in chemical reactions, as well as spot and uniform heating by microwave ovens. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of IEEE Transactions on Microwave Theory & Techniques is the property of IEEE and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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      – Type: doi
        Value: 10.1109/TMTT.2018.2836393
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      – Code: eng
        Text: English
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        PageCount: 8
        StartPage: 3315
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      – SubjectFull: Injection locked oscillators
        Type: general
      – SubjectFull: Electronic amplifiers
        Type: general
      – SubjectFull: Microwave generation
        Type: general
      – SubjectFull: Phase-locked loops
        Type: general
      – SubjectFull: Microwave ovens
        Type: general
      – SubjectFull: Metal oxide semiconductors
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      – SubjectFull: Gallium nitride
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      – TitleFull: 2.4-GHz-Band High-Power and High-Efficiency Solid-State Injection-Locked Oscillator.
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              M: 07
              Text: Jul2018
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