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Optimization of a broadband VH lumped-element ferrite circulator.

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Title: Optimization of a broadband VH lumped-element ferrite circulator.
Authors: Smith, Jacob R.1 jyoung@uidaho.edu, Dong, Hang1, Young, Jeffrey L.1, Aldecoa, Brandon2
Source: Microwave & Optical Technology Letters. Jul2013, Vol. 55 Issue 7, p1476-1481. 6p.
Subjects: Broadband communication systems, Ferrite circulators, Mathematical optimization, Lumped elements, Genetic algorithms, Bandwidths, Shortwave radio
Abstract: A multistage optimization procedure is provided to maximize the operating bandwidth of a very high frequency circulator. We show through hardware validation that bandwidths on the order of 52.3-80.9 MHz are achievable using a 15 dB isolation specification. Simulation studies indicate that bandwidths on the order of 100% are possible, but such wideband performance has not been achieved in hardware to date. The optimization procedure uses both genetic algorithms and orthogonal sweep methods to find the best crossover geometry and ferrite properties, but the outcome of both methods is roughly the same. Matching networks are used to tune the response and to widen the operating frequency band. These networks are optimized using Pareto tradeoff charts in the context of power metrics like return loss, isolation, and insertion loss. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1476-1481, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27654 [ABSTRACT FROM AUTHOR]
Copyright of Microwave & Optical Technology Letters is the property of Wiley-Blackwell 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: Optimization of a broadband VH lumped-element ferrite circulator.
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  Data: <searchLink fieldCode="JN" term="%22Microwave+%26+Optical+Technology+Letters%22">Microwave & Optical Technology Letters</searchLink>. Jul2013, Vol. 55 Issue 7, p1476-1481. 6p.
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  Data: <searchLink fieldCode="DE" term="%22Broadband+communication+systems%22">Broadband communication systems</searchLink><br /><searchLink fieldCode="DE" term="%22Ferrite+circulators%22">Ferrite circulators</searchLink><br /><searchLink fieldCode="DE" term="%22Mathematical+optimization%22">Mathematical optimization</searchLink><br /><searchLink fieldCode="DE" term="%22Lumped+elements%22">Lumped elements</searchLink><br /><searchLink fieldCode="DE" term="%22Genetic+algorithms%22">Genetic algorithms</searchLink><br /><searchLink fieldCode="DE" term="%22Bandwidths%22">Bandwidths</searchLink><br /><searchLink fieldCode="DE" term="%22Shortwave+radio%22">Shortwave radio</searchLink>
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  Data: A multistage optimization procedure is provided to maximize the operating bandwidth of a very high frequency circulator. We show through hardware validation that bandwidths on the order of 52.3-80.9 MHz are achievable using a 15 dB isolation specification. Simulation studies indicate that bandwidths on the order of 100% are possible, but such wideband performance has not been achieved in hardware to date. The optimization procedure uses both genetic algorithms and orthogonal sweep methods to find the best crossover geometry and ferrite properties, but the outcome of both methods is roughly the same. Matching networks are used to tune the response and to widen the operating frequency band. These networks are optimized using Pareto tradeoff charts in the context of power metrics like return loss, isolation, and insertion loss. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1476-1481, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27654 [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Microwave & Optical Technology Letters is the property of Wiley-Blackwell 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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        Value: 10.1002/mop.27645
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      – Code: eng
        Text: English
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        PageCount: 6
        StartPage: 1476
    Subjects:
      – SubjectFull: Broadband communication systems
        Type: general
      – SubjectFull: Ferrite circulators
        Type: general
      – SubjectFull: Mathematical optimization
        Type: general
      – SubjectFull: Lumped elements
        Type: general
      – SubjectFull: Genetic algorithms
        Type: general
      – SubjectFull: Bandwidths
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      – SubjectFull: Shortwave radio
        Type: general
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      – TitleFull: Optimization of a broadband VH lumped-element ferrite circulator.
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              Text: Jul2013
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