Unidirectional surface acoustic wave device

Details Unidirectional surface acoustic wave device Unidirectional surface acoustic wave device

1987-09-16

1988-10-04

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Electromechanical filter

333151, 333154, 333195, 333196, 310313B, H03H 9145, H03H 964, H03H 968

Patent

active

047758465

ABSTRACT:
In order to present an asymmetric frequency characteristic in an unidirectional acoustic surface wave device with a simple external phase shifter, a transducer formed on a substrate have three interaction areas (acoustic sources) defined by different three electrodes, first electrode being common, second electrode being connected to one end of the phase shifter, third electrode being connected to another end of the phase shifter, and distances between interaction areas being unequal to 2n (n:integer).

REFERENCES:
patent: 4254388 (1981-03-01), Mikoshiba et al.
patent: 4422000 (1983-12-01), Yamada et al.
Yamada et al--"Relation of the Insertion Loss and Triple Tansit Echo in Saw Unidirectional Transducers", Proc. of 3rd Symposium on Ultrasonic Electronics, Tokyo 1982, Japanese Journal of Applied Physics, vol. 22, supplement 22-23, 1983; pp. 163-164.
Meguro et al-"A Flat-Amplitude Surface Acoustic Wave Filter Incorporating a Group Based Unidirectional Transducer" Lectures 1-5-14 Japan Acoustic Academy, Dec. 1976; pp. 153-154.

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