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Double-resonance SAW filters.

Johanna Meltaus1, Seong Su Hong, Olli Holmgren

  • 1Helsinki University of Technology, Espoo, Finland. Johanna.Meltaus@tkk.fi

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
|March 23, 2007
PubMed
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This study introduces a novel surface acoustic wave filter using a leaky-wave substrate. The double-resonance filter achieves a narrow passband with low insertion loss and high suppression, outperforming classical filters.

Area of Science:

  • * Electrical Engineering
  • * Materials Science
  • * Physics

Background:

  • * Traditional coupled resonator filters face limitations in achieving narrow passbands with low insertion loss and high suppression.
  • * Leaky-wave substrates offer unique acoustic wave propagation characteristics.
  • * Developing advanced Surface Acoustic Wave (SAW) filters is crucial for modern wireless communication systems.

Purpose of the Study:

  • * To investigate a novel Surface Acoustic Wave (SAW) filter design utilizing a leaky-wave substrate and a distributed gap.
  • * To characterize the performance of this double-resonance filter, focusing on passband width, insertion loss, skirt steepness, and suppression levels.
  • * To compare the performance of the novel filter with classical coupled resonator filters.

Main Methods:

Related Experiment Videos

  • * Fabrication and experimental testing of a SAW filter on a 42 degrees-rotated lithium tantalite leaky-wave substrate.
  • * Utilizing long interdigital transducers with specific finger counts relative to coupling coefficient (K2) and reflectivity (kappa).
  • * Acoustical power distribution measurement via scanning laser interferometry and comparison with coupling-of-modes (COM) simulations.

Main Results:

  • * The novel double-resonance filter demonstrated a narrow passband (1.9% of center frequency) with a minimum insertion loss of 1.07 dB and 30 dB suppression at 1.6 GHz.
  • * Experimental results showed low amplitude and phase imbalances for the balanced filter configurations.
  • * Measured acoustical power distributions correlated well with COM simulation results.

Conclusions:

  • * The proposed hiccup-type resonance in a distributed gap on a leaky-wave substrate enables a high-performance SAW filter.
  • * This double-resonance filter design offers superior performance metrics compared to conventional coupled resonator filters.
  • * The findings validate the effectiveness of the novel structure and the accuracy of the COM modeling approach for SAW device analysis.