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    This study presents a tuneable 9.365-GHz aperiodic Bragg resonator for microwave applications. It achieves a 130 MHz tuning range with high unloaded Q values exceeding 100,000.

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    Area of Science:

    • Microwave Engineering
    • Resonator Design
    • Electromagnetics

    Background:

    • Aperiodic Bragg resonators offer unique electromagnetic properties.
    • Tuneable microwave resonators are crucial for various applications, including frequency-agile systems.

    Purpose of the Study:

    • To design, simulate, and measure a tuneable 9.365-GHz aperiodic Bragg resonator.
    • To demonstrate a wide tuning range and high-quality factor (Q) for the resonator.
    • To investigate effective modeling techniques for resonator optimization.

    Main Methods:

    • Utilized an aperiodic arrangement of low-loss alumina plates in a cylindrical metal waveguide.
    • Implemented a multi-element bellows/probe assembly for cavity length variation to achieve tuning.
    • Employed ABCD circuit models for rapid simulation and a 2.5-D field solver for detailed analysis.

    Main Results:

    • Achieved a demonstrated tuning range of 130 MHz (1.39%).
    • Observed insertion loss varying from -2.84 to -12.03 dB.
    • Measured unloaded Q values ranging from 43,788 to 122,550, with 10 out of 13 points exceeding 100,000.

    Conclusions:

    • The designed aperiodic Bragg resonator successfully demonstrates wide tunability and high Q.
    • The proposed design and modeling techniques are effective for developing advanced microwave components.
    • This resonator is suitable for applications requiring precise and agile frequency control.