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Spherical Bragg reflector resonators.

Michael E Tobar1, Jean-Michel Le Floch, Dominique Cros

  • 1School of Physics, The University of Western Australia, Crawley, WA, 6009, Australia. mike@physics.uwa.edu.au

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
|October 14, 2004
PubMed
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Researchers developed a novel spherical Bragg reflector (SBR) resonator. This new design significantly enhances resonator performance by concentrating energy, achieving a Q-factor of 22,000 with Teflon.

Area of Science:

  • Electromagnetics
  • Materials Science
  • Resonator Technology

Background:

  • Traditional resonators often suffer from conductor losses, limiting their performance.
  • Dielectric resonators offer an alternative but can be constrained by material properties.
  • Minimizing energy interaction with cavity walls is crucial for high-Q resonators.

Purpose of the Study:

  • To introduce and validate the spherical Bragg reflector (SBR) resonator concept.
  • To design a resonator that concentrates energy in its central region, minimizing losses.
  • To achieve significantly enhanced Q-factors compared to conventional designs.

Main Methods:

  • Development of a multi-layered spherical dielectric resonator within a spherical cavity.
  • Derivation of simultaneous equations for precise layer dimension and frequency calculation.

Related Experiment Videos

  • Validation of design calculations using finite-element analysis.
  • Construction and testing of a Teflon SBR resonator prototype.

    • Main Results:

    • A Teflon SBR resonator designed at 13.86 GHz achieved a Q-factor of 22,000.
    • Experimental results closely matched theoretical design values.
    • Demonstrated a 3.5x performance enhancement over Teflon-limited resonators.

    Conclusions:

    • The spherical Bragg reflector (SBR) resonator effectively concentrates energy, minimizing conductor losses.
    • The SBR design offers a pathway to significantly higher Q-factors, potentially reaching 300,000 with low-loss materials.
    • This technology holds promise for advanced applications requiring high-performance resonators.