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Acoustic Wave Filter Technology-A Review.

Clemens C W Ruppel

    IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
    |April 10, 2017
    PubMed
    Summary
    This summary is machine-generated.

    Acoustic filters, including surface acoustic wave (SAW) and bulk acoustic wave (BAW) types, are essential for modern smartphones. Innovations are driving high-volume applications for intermediate frequency (IF) and radio frequency (RF) filters.

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    Area of Science:

    • Electrical Engineering
    • Materials Science
    • Telecommunications

    Background:

    • Acoustic filters are critical for meeting performance and form factor requirements in cellular phone standards.
    • Smartphones, representing a significant portion of the two billion mobile phones sold annually, demand a rapidly increasing number of filter functions.
    • Surface Acoustic Wave (SAW) filters dominate below 1 GHz, while Bulk Acoustic Wave (BAW) and SAW filters compete at higher frequencies.

    Purpose of the Study:

    • To highlight innovations enabling high-volume applications of intermediate frequency (IF) and radio frequency (RF) acoustic filters.
    • To discuss the role of acoustic filters in the evolving landscape of cellular phone technology.
    • To examine the specific applications of TV IF filters, cellular phone IF filters, and SAW/BAW RF filters.

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    Main Methods:

    • Review of existing literature and industry trends in acoustic filter technology.
    • Analysis of the factors contributing to the success of acoustic filters, including substrate quality and fabrication techniques.
    • Focus on innovations driving the adoption of IF and RF acoustic filters in high-volume markets.

    Main Results:

    • Acoustic filters are indispensable for current and future smartphone technology.
    • The development of high-quality substrates, advanced fabrication, precise simulation, and design tools are key enablers.
    • Innovations are paving the way for widespread use of IF and RF acoustic filters.

    Conclusions:

    • Acoustic filters, particularly SAW and BAW, are vital components in the RF front-end of cellular phones.
    • Continued innovation in materials, fabrication, and design is crucial for meeting the increasing demands of mobile communication standards.
    • The paper emphasizes the importance of these filters for high-volume applications in consumer electronics.