Weighting transducer for surface acoustic wave filter

Details Weighting transducer for surface acoustic wave filter Weighting transducer for surface acoustic wave filter

1992-06-23

1994-07-05

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

H01L 4108

Patent

active

053270398

ABSTRACT:
According to this invention, a weighting transducer for a surface acoustic wave filter includes first, second, third bus electrodes, odd-numbered transducer fingers, and even-numbered transducer fingers. The first, second, third bus electrodes are formed on a piezoelectric substrate. The odd-numbered transducer fingers are formed on the piezoelectric substrate and consist of first transducer fingers connected to the first bus electrode and second transducer fingers connected to the second bus electrode and spaced apart from the first transducer fingers by a predetermined interval in the longitudinal direction. The even-numbered transducer fingers are formed on the piezoelectric substrate, connected to the third bus electrode, and consist of third transducer fingers overlapping the first and second transducer fingers.

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M. Hikita et al., "Phase Weighting for Low Loss Saw Filters", 0090-5607/80/0000-0308 $0075 c 1980 IEEE, 1980 Ultrasonics Symposium, pp. 308-312.
J. Desbois, "Low Loss Saw Bandpass Filters", 0090-5607/81/0000-0017 $00.75 c 1981 IEEE, 1981 Ultrasonics Symposium, p. 17.
H. Matthews, "Surface Wave Filters", John Wiley & Sons, pp. 120-126.
M. Feldmann et al., "Surface Acoustic Waves for Signal Processing", Artech House, pp. 175-177.

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