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Switchable and Tunable BAW Duplexer Based on Ferroelectric Material.

Almonir Abdulgader Mansour, Thottam S Kalkur

    IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
    |December 4, 2016
    PubMed
    Summary

    This study presents a switchable bulk acoustic wave (BAW) duplexer using barium strontium titanate (BST) thin film. Applying DC bias tunes the RF filter

    Area of Science:

    • Electrical Engineering
    • Materials Science
    • Physics

    Background:

    • Radio Frequency (RF) applications require efficient duplexers for signal filtering.
    • Traditional duplexers face limitations in tunability and switchability.
    • Bulk Acoustic Wave (BAW) devices offer potential for high-performance RF filtering.

    Purpose of the Study:

    • To develop a switchable and tunable BAW duplexer for RF applications.
    • To investigate the electrostrictive properties of barium strontium titanate (BST) thin films for tunable filtering.
    • To validate the performance of the fabricated BAW duplexer through simulation and measurement.

    Main Methods:

    • Fabrication of a BAW duplexer on a sapphire substrate using solidly mounted resonators.
    • Utilizing metal-organic solution deposition for BST thin film formation.

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  • Employing six layers of silicon dioxide and tantalum oxide as Bragg reflectors.
  • Applying DC bias to induce electrostriction in the BST thin film for tuning filter response.

    • Main Results:

    • The BAW duplexer demonstrated switchable bandpass responses for transmitting (Tx) and receiving (Rx) filters.
    • Center frequencies were observed at 4.635 GHz (Tx) and 4.878 GHz (Rx) with bandwidths of 119 MHz and 154 MHz, respectively.
    • Simulated results using circuit, Butterworth-van-Dyke, and electromagnetic models closely matched experimental measurements.

    Conclusions:

    • A switchable and tunable BAW duplexer utilizing BST thin film electrostriction was successfully fabricated and demonstrated.
    • The device shows promise for advanced RF applications requiring adaptable filtering.
    • The electrostrictive effect in BST provides an effective mechanism for tuning BAW duplexer performance.