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High-Q Tuneable 10-GHz Bragg Resonator for Oscillator Applications

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Publication details

JournalIEEE Transaction of Ultrasonics Ferroelectrics and Frequency Control
DateAccepted/In press - 4 Dec 2017
DateE-pub ahead of print - 11 Dec 2017
DatePublished (current) - 1 Feb 2018
Issue number2
Number of pages11
Pages (from-to)281-291
Early online date11/12/17
Original languageEnglish


This paper describes the design, simulation, and measurement of a tuneable 9.365-GHz aperiodic Bragg resonator. The resonator utilizes an aperiodic arrangement of non (λ/4) low-loss alumina plates (εr = 9.75, loss tangent of 1×10−5 to 2 × 10−5) mounted in a cylindrical metal waveguide. Tuning is achieved by varying the length of the center section of the cavity. A multi-element bellows/probe assembly is presented. A tuning range of 130 MHz (1.39%) is demonstrated. The insertion loss S21 varies from −2.84 to −12.03 dB while the unloaded Q varies from 43 788 to 122 550 over this tuning range. At 10 of the 13 measurement points, the unloaded Q exceeds 100 000, and the insertion loss is above −7 dB. Two modeling techniques are discussed; these include a simple ABCD circuit model for rapid simulation and optimization and a 2.5-D field solver, which is used to plot the field distribution inside the cavity.

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    Research areas

  • Bragg Resonators, Dielectric Resonators (DRs), Low-Noise Oscillators, Tuneable Resonators, tuneable resonators, dielectric resonators (DRs), low-noise oscillators, Bragg resonators


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