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A multi-IDT input tunable surface acoustic wave filter.

J Zhu1, N W Emanetoglu, Y Lu

  • 1Motorola Inc, Piscataway, NJ 08854, USA.

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
|September 26, 2001
PubMed
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This study presents a tunable surface acoustic wave (SAW) filter (TSF) prototype with multiple interdigital transducers (IDTs). The novel multi-IDT design allows for adjustable center frequencies and bandwidths, enhancing wireless communication performance.

Area of Science:

  • Electrical Engineering
  • Materials Science

Background:

  • Surface Acoustic Wave (SAW) filters are crucial components in modern wireless telecommunication systems.
  • Existing SAW filter designs often lack tunability, limiting their adaptability to diverse frequency requirements.

Purpose of the Study:

  • To develop a prototype of a tunable surface acoustic wave (SAW) filter (TSF) with a multi-interdigital transducer (IDT) input.
  • To demonstrate the tunability of center frequency and 3 dB bandwidth by configuring multiple IDTs.
  • To improve filter performance by reducing passband ripple using impedance weighting techniques.

Main Methods:

  • A multi-IDT input TSF prototype was designed and fabricated.
  • Different filter configurations were achieved by selecting and combining various IDTs.

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  • Impedance weighting, specifically resistance weighting, was applied to optimize filter characteristics.

    • Main Results:

    • The TSF exhibited tunable center frequencies ranging from 126.8 to 199.1 MHz.
    • Tunable 3 dB bandwidths were achieved, varying from 15.2 to 58.9 MHz.
    • Resistance weighting significantly reduced the passband ripple from 6.44 dB to 1.37 dB.

    Conclusions:

    • The developed multi-IDT TSF prototype successfully demonstrates tunable frequency and bandwidth.
    • Impedance weighting is an effective method for enhancing SAW filter performance, particularly in reducing passband ripple.
    • This tunable TSF technology holds promise for advanced wireless communication applications.