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    Theory and Design of Tunable Full-Mode and Half-Mode Ferrite Waveguide Isolators

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    Theory and Design of Tunable Full-Mode and Half-Mode Ferrite Waveguide Isolators.pdf
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    Type
    Article
    Authors
    Ghaffar, Farhan A. cc
    Bray, Joey R.
    Vaseem, Mohammed
    Roy, Langis
    Shamim, Atif cc
    KAUST Department
    Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division
    Electrical Engineering Program
    Date
    2019-04-25
    Online Publication Date
    2019-04-25
    Print Publication Date
    2019
    Permanent link to this record
    http://hdl.handle.net/10754/652871
    
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    Abstract
    Ferrite isolators are attractive due to their excellent isolation, low loss, good linearity, and high-power performance. However, these devices usually operate over a single-frequency band. Multiband applications are possible if the isolation bandwidth of an isolator can be tuned. This paper presents a tunable waveguide-based full-mode ferrite isolator as well as a more compact half-mode tunable isolator, both fabricated on yttrium-iron-garnet substrates. For the first time, theory and design guidelines for the center frequency, bandwidth, and tuning of the ferrite isolators' unidirectional magnetostatic surface wave (MSW) mode are presented. The proposed theoretical model reveals that the isolation bandwidth can exceed 100% if the magnetization-to-bias field ratio is higher than 8. Although the full-mode design is fabricated using a conventional subtractive technique, the half-mode design is implemented using inkjet printing technology. The full-mode isolator provides a maximum bandwidth of 45% and a peak isolator figure of merit (IFM) of over 65 dB at 7 GHz, whereas the half-mode design has a maximum bandwidth of 59% and a peak IFM of 76.7 dB at 7.5 GHz. The tuning of the center frequency is from 7 to 10.7 GHz for the full-mode and from 4.4 to 9.9 GHz for the half-mode design using magnetic field strengths up to 2500 and 2400 Oe, respectively. This paper demonstrates the versatility of ferrite isolators as tunable microwave devices for reconfigurable RF applications.
    Citation
    Ghaffar FA, Bray JR, Vaseem M, Roy L, Shamim A (2019) Theory and Design of Tunable Full-Mode and Half-Mode Ferrite Waveguide Isolators. IEEE Transactions on Magnetics: 1–8. Available: http://dx.doi.org/10.1109/tmag.2019.2910028.
    Sponsors
    This work was supported by the King Abdullah University of Science and Technology, Royal Military College (RMC) of Canada and OntarioTech University (UOIT).
    Publisher
    Institute of Electrical and Electronics Engineers (IEEE)
    Journal
    IEEE Transactions on Magnetics
    DOI
    10.1109/tmag.2019.2910028
    Additional Links
    https://ieeexplore.ieee.org/document/8699110
    ae974a485f413a2113503eed53cd6c53
    10.1109/tmag.2019.2910028
    Scopus Count
    Collections
    Articles; Electrical and Computer Engineering Program; Computer, Electrical and Mathematical Science and Engineering (CEMSE) Division

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