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New low-loss broadband SAW filter using unidirectional IDTs with U-shaped MSCs

New low-loss broadband SAW filter using unidirectional IDTs with U-shaped MSCs

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© The Institution of Electrical Engineers
Published

A new low-loss broadband SAW filter is presented. A new configuration using one pair of electrically connected IDTs with an optimum number of fingers, as well as unidirectional IDTs with U-shaped MSCs, is described. Experimental results with bandwidth as wide as 10% and loss as low as 3 dB are achieved. Very accurate computer-aided design of a low-loss filter with MSCs is obtained.

Inspec keywords: band-pass filters; surface acoustic wave devices; crystal filters

Other keywords: optimum number of fingers; multistrip couplers; bandwidth 10%; configuration; unidirectional IDTs; computer-aided design; VHF; U-shaped MSCs; low-loss broadband SAW filter; loss 3 dB

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

References

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      • H. Kojima , Y. Kinoshita , M. Hikita , T. Tabuchi . Velocity, electromechanical coupling factor and acoustic loss of surface shear waves propagating along X-axis on rotated Y-cut plates of LiNbO3. Electron. Lett. , 445 - 446
    2. 2)
      • Hikita, M., Kinoshita, Y., Kojima, H., Tabuchi, T.: `Phase weighting for low loss SAW filters', 1980 Ultrasonics Symp. Proc., IEEE, p. 308–312.
    3. 3)
      • F.G. Marshall , C.O. Newton , G.S. Paige . Theory and design of surface acoustic wave multistrip coupler. IEEE Trans. , 206 - 225
    4. 4)
      • K. Yamanouchi , K. Shibayama . Propagation and amplification of Rayleigh waves and piezoelectric leaky waves in LiNbO3. J. Appl. Phys. , 856 - 862
    5. 5)
      • Hikita, M., Kinoshita, Y., Kojima, H., Tabuchi, T.: `800 MHz low loss SAW filters using new phase weighting', IEEE MTT-S International Microwave Symp. Digest, 1982, p. 46–48.
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