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1.03 GHz operation of a low-loss SAW filter using 3-phase unidirectional transducers with thin dielectric layered feed electrodes

1.03 GHz operation of a low-loss SAW filter using 3-phase unidirectional transducers with thin dielectric layered feed electrodes

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Successful working of a 3-phase unidirectional transducer (TPUDT) SAW filter at 1.03 GHz, without using any airgap crossovers, is reported in the letter. A thin-film capacitance existing between the feed electrodes of the transducers is used to advantage, as an essential element of the required phaseshifting network. The minimum insertion loss is found to be 2.0 dB. The filter is believed to have wide applications in the present and future communication systems requiring low-loss bandpass filtering.

References

    1. 1)
      • Yamanouchi, K., Meguro, T., Gautam, J.K.: `Low-loss GHz range SAW filters using group-type unidirectional transducers—new GUDT and new phase shifter', IEEE Ultrasonics Symposium Proc., 1982, p. 212–217.
    2. 2)
      • K. Yamanouchi , J.K. Gautam , T. Meguro . New phase-shifting technique for group-type unidirectional transducers used in surface-acoustic-wave filters. Electron. Lett. , 168 - 169
    3. 3)
      • D.L. Ash . An improved high performance TV receiver. Proc. IEEE , 1345 - 1357
    4. 4)
      • Brown, R.B.: `Electrical matching of unidirectional surface wave devices', Proc. 1975 IEEE-MTT-S Int. Microwave Symp., p. 359–361.
    5. 5)
      • J.K. Gautam , T. Meguro , K. Yamanouchi . Low-loss unidirectional SAW filters using microinductors. Electron. Lett. , 858 - 860
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