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A network model for arbitrarily oriented IDT structures.

M P da Cunha1, E L Adler

  • 1Dept. of Electr. Eng., McGill Univ., Montreal, Que.

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
|January 1, 1993
PubMed
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This study presents a network model for analyzing arbitrarily oriented surface acoustic wave (SAW) grating structures with interdigital transducers (IDTs). The model provides physical insight and simplifies finding optimal orientations for high directivity.

Area of Science:

  • Electrical Engineering
  • Materials Science
  • Acoustics

Background:

  • Surface Acoustic Wave (SAW) devices are crucial for signal processing.
  • Analyzing arbitrarily oriented SAW grating structures with interdigital transducers (IDTs) presents challenges.
  • Existing models may not fully capture the complexities of non-standard orientations.

Purpose of the Study:

  • To extend a network model for analyzing arbitrarily oriented short-circuited SAW grating structures.
  • To incorporate arbitrarily oriented interdigital transducers (IDTs) into the existing network model.
  • To provide a method for gaining physical insight and identifying high directivity orientations.

Main Methods:

  • The interdigital transducer (IDT) structure is discretized into cells.

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  • Each cell is modeled as a sequence of mismatched transmission lines representing metallized and unmetallized regions.
  • The model incorporates impedance differences, reflection coefficients (using Datta-Hunsinger perturbation formula), velocity differences (via SAW propagation software), and energy storage susceptance at discontinuities.

    • Main Results:

    • The developed network model effectively analyzes arbitrarily oriented SAW grating structures with IDTs.
    • The model provides detailed physical insight into the device characteristics.
    • It facilitates straightforward identification of orientations yielding high directivity.

    Conclusions:

    • The extended network model offers a robust approach for analyzing complex SAW grating structures.
    • This model enhances understanding of device behavior and aids in optimizing performance.
    • It simplifies the process of selecting optimal orientations for improved directivity in SAW devices.