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    A new hetero acoustic layer (HAL) structure using LiNbO3 (LN) and ABC-G glass significantly improves surface acoustic wave (SAW) resonators. This breakthrough achieves both wide bandwidth (BW) and low temperature coefficient of frequency (TCF) for advanced electronic devices.

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    Area of Science:

    • Materials Science
    • Acoustic Devices
    • Physics

    Background:

    • Wideband surface acoustic wave (SAW) devices are crucial for modern electronics.
    • Existing SAW resonators with high coupling factors suffer from poor temperature stability (large negative TCF).
    • There is a need for SAW devices that offer both wide bandwidth and stable performance across temperatures.

    Purpose of the Study:

    • To develop a novel hetero acoustic layer (HAL) structure for SAW resonators.
    • To combine Lithium Niobate (LiNbO3, LN) with a low coefficient of thermal expansion (CTE) glass (ABC-G glass).
    • To achieve SAW resonators with simultaneously large bandwidth (BW) and a low temperature coefficient of frequency (TCF).

    Main Methods:

    • Characterization of bulk and leaky SAW (LSAW) velocities and their temperature coefficients (TCV) of ABC-G glass using ultrasonic microspectroscopy (UMS).
    • Experimental fabrication and testing of LN/ABC-G structures using specific LN crystal orientations ((0°, 101°, 0°) and (0°, 120°, 0°)).
    • Prototyping of ladder filters using LN/ABC-G resonators in a T-type configuration.

    Main Results:

    • The ABC-G glass exhibited a positive temperature coefficient of velocity (TCV).
    • The LN/ABC-G resonators demonstrated high impedance ratios (Z-ratio) up to 82 dB and bandwidths (BW) of 12%.
    • Measured TCFs were as low as -27 ppm/°C and -24 ppm/°C, a significant improvement over LN/Quartz (Qz).
    • Fabricated ladder filters achieved insertion loss below 1 dB with a fractional bandwidth (FBW) of 15.0% and no spurious response up to 10 GHz.

    Conclusions:

    • The developed LN/ABC-G hetero acoustic layer (HAL) structure effectively addresses the trade-off between bandwidth and temperature stability in SAW devices.
    • This new structure offers a promising solution for applications demanding high performance, including wide bandwidth, excellent temperature stability, and spurious-free operation.
    • The LN/ABC-G material combination represents a significant advancement in SAW resonator technology.