S.A.W. bandpass filter with −50 dB sidelobes using unweighted i.d.t.s

S.A.W. bandpass filter with −50 dB sidelobes using unweighted i.d.t.s

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The use of a resonantly loaded i.d.t. (r.l.i.d.t.) as an s.a.w. track changer in bandpass filter design is described. A filter with 3dB fractional bandwidth (f.b.w.) of 11.5% and −50 dB sidelobes is realised using unweighted input/output i.d.t.s of 5½ finger pairs each and a 7½ finger pair r.l.i.d.t. as the s.a.w. track changer. The scheme is expected to be useful in realising low-shape-factor low-sidelobe bandpass filters using relatively short i.d.t.s.


    1. 1)
      • C.S. Hartmann , D.T. Bell , R.C. Rosenfeld . Impulse model design of acoustic surface wave filters. IEEE Trans. , 162 - 175
    2. 2)
      • K.M. Lakin , D.W.T. Mih , R.M. Torr . A new interdigital electrode transducer geometry. IEEE Trans. , 763 - 768
    3. 3)
      • Hartmann, C.S.: `Weighting interdigital surface wave transducers by selective withdrawal of electrodes', Proceedings of the IEEE ultrasonics symposium, 1973, p. 423–426.
    4. 4)
      • D.C. Malocha , B.J. Hunsinger . Capacitive tap weighted s.a.w. transducers. IEEE Trans. , 293 - 300
    5. 5)
      • F.G. Marshall , C.O. Hewion , E.G.S. Paige . Surface acoustic wave multistrip components and their applications. IEEE Trans. , 216 - 225
    6. 6)
      • S.G. Joshi , P. Sudhakar . Scattering parameters of inter-digital surface acoustic wave transducers. IEEE Trans. , 201 - 205
    7. 7)
      • W.R. Smith , H.M. Gerard , J.H. Collins , T.M. Reeder , H.J. Shaw . Design of surface wave delay lines with inter-digital transducers. IEEE Trans. , 865 - 873
    8. 8)
      • Skeie, H., Rønnkleiv, A.: `Electrostatic in weighted surface wave transducers', Proceedings of the IEEE ultrasonics symposium, 1976, p. 540–542.
    9. 9)
      • Miller, R.L., de vries, A.J.: `Commercial application of a surface wave television IF filter', IEEE microwave symposium, 1976, p. 318–320.

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