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Related Experiment Videos

Low-loss, multimode 5-IDT SAW filter.

Johanna Meltaus1, Victor P Plessky, Sanna Härmä

  • 1Materials Physics Laboratory, Helsinki University of Technology, FIN-02015 HUT, Finland. Johanna.Meltaus@hut.fi

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
|August 27, 2005
PubMed
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Researchers reduced insertion loss in longitudinally coupled resonator filters by replacing gaps with short transducer sections. This innovation improves performance for wide bandwidth, low loss, and high suppression applications.

Area of Science:

  • Electrical Engineering
  • Materials Science

Background:

  • Longitudinally coupled resonator filters offer unbalanced-balanced operation but face challenges with insertion loss at high frequencies.
  • Resistive losses and scattering in filter gaps degrade performance, particularly in the 1.8-2.2 GHz range.

Purpose of the Study:

  • To reduce insertion loss in longitudinally coupled resonator filters.
  • To enhance filter performance by modifying transducer design.

Main Methods:

  • Replacing filter gaps with short transducer sections featuring a different pitch.
  • Analyzing the impact of contact pad layout and connections on device performance.

Main Results:

  • Achieved balun operation at 1842 MHz with 4.5% bandwidth and -40 dB suppression.

Related Experiment Videos

  • Demonstrated minimum insertion loss below 1 dB and a flat passband with <1 dB ripple.
  • Minimized insertion loss by modifying transducer design, reducing scattering and resistive losses.

    • Conclusions:

    • The proposed modification effectively reduces insertion loss in longitudinally coupled resonator filters.
    • The new design enhances filter performance, offering wide bandwidth, low loss, and high suppression.
    • Contact pad layout significantly influences device performance and balance characteristics.