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A novel reflector-filter using a SAW waveguide directional coupler.

J Tsutsumi1, T Matsuda, O Ikata

  • 1Media Dev. Lab., Fujitsu Labs. Ltd., Akashi.

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
|February 2, 2008
PubMed
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This study introduces a novel Surface Acoustic Wave (SAW) waveguide reflector-filter for compact IF filters in CDMA handsets. The new design achieves half the size of conventional filters while maintaining excellent performance.

Area of Science:

  • Electrical Engineering
  • Materials Science
  • Acoustics

Background:

  • Compact Intermediate Frequency (IF) filters are crucial for Code Division Multiple Access (CDMA) handsets.
  • Existing transversal filters are often too large for modern compact devices.

Purpose of the Study:

  • To develop a novel, compact reflector-filter using Surface Acoustic Wave (SAW) waveguide technology.
  • To achieve steep skirt characteristics in a reduced device length for IF filters.

Main Methods:

  • Utilized a SAW waveguide directional coupler for the reflector-filter structure.
  • Fabricated SAW waveguides using Aluminum (Al) gratings on quartz substrates.
  • Optimized Al grating pitch to avoid stopband interference within the filter's passband.

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Main Results:

  • Successfully fabricated PCS-CDMA IF filters using the proposed SAW waveguide reflector-filter.
  • Achieved an insertion loss of 8.5 dB and a 5 dB bandwidth of 1.45 MHz.
  • Demonstrated a rejection of over 33 dB at +/-1.25 MHz from the center frequency.
  • Reduced the package size to 4.8x9.1 mm², achieving half the size of conventional transversal filters.

Conclusions:

  • The proposed SAW waveguide reflector-filter technique enables the realization of highly compact IF filters.
  • This technology offers a viable solution for miniaturizing RF components in wireless communication devices like CDMA handsets.