Surface acoustic wave filter

Details Surface acoustic wave filter Surface acoustic wave filter

1984-11-16

1986-07-22

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Electromechanical filter

310313D, 333154, 333196, H03H 964

Patent

active

046022287

ABSTRACT:
A surface acoustic wave filter comprising unidirectional interdigital input and output transducers at least one of which has imperfect unidirectivity and includes two interdigital electrodes arranged to provide a geometrical phase difference .phi..sub.M therebetween and interconnected through a phase shifter which provides an electrical phase difference .phi..sub.E therebetween, the sum of the phase differences .phi..sub.M and .phi..sub.E being unequal to .pi. radians to provide the imperfectness of unidirectivity. The selection range of conductance of an external load or radiation conductance of the unidirectional transducer necessary for suppressing the undesired triple transit echo level can thus be extended while keeping the insertion loss relatively low.

REFERENCES:
patent: 3686518 (1972-08-01), Hartmann et al.
patent: 3723919 (1973-03-01), Adler
patent: 3866154 (1975-02-01), Moore
patent: 4422000 (1983-12-01), Yamada et al.
Yamada et al--"Relation of the Insertion Loss and Triple Transit Echo in Saw Unidirectional Transducers", Proc. of 3rd Symposium of Ultrasonic Electronics, Tokyo, 1982, JJAP, vol. 22 (1983) Supplement 22-3; pp. 163-164.
Yamanouchi et al--"Low Insertion Loss Acoustic Surface Wave Filter Using Group-Type Unidirectional Interdigital Transducer", 1975 Ultrasonics Symposium Proceedings; pp. 317-321.

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