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New SPUDT cell structures.

Guenter Martin1, Hagen Schmidt, Bert Wall

  • 1Leibniz Institute for Solid State and Materials Research Dresden, D-01171 Dresden, Germany. g.martin@ifwdresden.dc

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
|August 11, 2004
PubMed
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This study introduces novel single-phase unidirectional transducers (SPUDT) designs. New double-track and uniform width electrode SPUDT cells achieve unidirectional effects with wider fingers, enhancing transducer performance.

Area of Science:

  • Electrical Engineering
  • Materials Science
  • Acoustic Devices

Background:

  • Single-phase unidirectional transducers (SPUDT) are crucial for advanced electronic devices.
  • Existing SPUDT designs often require specific finger width ratios (e.g., lambda/8) to maintain unidirectionality.
  • There is a need for SPUDT cells that maintain unidirectional effects with broader electrode geometries.

Purpose of the Study:

  • To describe novel SPUDT cell designs that operate effectively with all fingers wider than lambda/8.
  • To investigate two new SPUDT configurations: double-track (DT) SPUDT and uniform width electrode (UWE) SPUDT.
  • To experimentally validate the unidirectional characteristics and performance of these new SPUDT designs.

Main Methods:

  • Development of a double-track (DT) SPUDT configuration utilizing lambda/4 and lambda/2 wide fingers in coupled waveguide tracks.

Related Experiment Videos

  • Design and analysis of uniform width electrode (UWE) SPUDT cells with finger widths of lambda/6, lambda/5, and lambda/3.
  • Experimental investigation of a lambda/5 UWE SPUDT cell and its application in a filter for reflection reduction.

    • Main Results:

    • The DT SPUDT demonstrated a verifiable unidirectional effect through waveguide coupling between two tracks.
    • The lambda/5 UWE SPUDT cell exhibited a clear unidirectional effect without requiring waveguide coupling.
    • Experimental results confirmed significant echo suppression in a filter designed with the lambda/5 UWE SPUDT.

    Conclusions:

    • Novel SPUDT designs, DT and UWE, successfully achieve unidirectionality with electrode fingers wider than lambda/8.
    • The UWE SPUDT, particularly the lambda/5 variant, offers a promising alternative for reduced reflections and simplified design.
    • These advancements contribute to improved performance and design flexibility in acoustic transducer technology.