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Low-loss SAW IF filters with new unidirectional IDTs used in digital mobile radios

Low-loss SAW IF filters with new unidirectional IDTs used in digital mobile radios

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© The Institution of Electrical Engineers
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A new type of unidirectional IDT having both excitation and reflection electrodes within each section of one wavelength (λo) was developed. High-performance SAW IF filters used in digital mobile radios with low insertion losses of 3.6 dB at 70 MHz and 3.8 dB at 250 MHz centre frequencies were realised using ST-cut quartz substrates.

Inspec keywords: digital radio systems; mobile radio systems; ultrasonic transducers; surface acoustic wave filters

Other keywords: reflection electrodes; 250 MHz; centre frequencies; 3.8 dB; SAW IF filters; insertion losses; unidirectional IDT; ST-cut quartz substrates; 70 MHz; excitation electrodes; 3.6 dB; digital mobile radios

Subjects: Passive filters and other passive networks; Mobile radio systems; Acoustic wave devices

References

    1. 1)
      • M. Hikita , T. Tabuchi , Y. Ishida , K. Kurosawa , K. Hamada . SAW integrated modules for 800-MHz cellular radio portable telephones with new frequency allocations. IEEE Trans.
    2. 2)
      • Kodama, T., Kawabata, H., Yasuhara, Y., Sato, H.I.: `Design of low-loss SAW filters employing distributed acoustic reflection transducers', IEEE Ultrason. Symp. Proc., 1986, p. 59.
    3. 3)
      • W.R. Smith , H.M. Gerard , W.R. Jones . Analysis and design of dispersive interdigital surface-wave transducers. IEEE Trans.
    4. 4)
      • M.F. Lewis . Group-type unidirectional SAW devices employing intra-transducer reflector banks. Electron. Lett.
    5. 5)
      • Hartman, C.S., Abbott, B.P.: `Experimentally determining the transduction magnitude and phase and the reflection magnitude and phase of SAW SPUDT structures', IEEE Ultrason. Symp. Proc., 1990, p. 37.
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