Acoustic surface wave device

Details Acoustic surface wave device Acoustic surface wave device

1983-09-13

1985-04-16

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Electromechanical filter

310313A, 310313C, 333151, 333154, H03H 964, H03H 9145, H03H 930

Patent

active

045118663

ABSTRACT:
An acoustic surface wave device uses an in-line arrangement of two apodized interdigital electrode arrays 2, 3 to launch and receive surface waves to overcome problems of short overlap sources and of diffraction by making the arrays approximately 3.lambda..sub.c wide between the outer boundaries of the bus bars so that the arrays can each only propagate and transduce a single acoustic surface waveguide mode which is symmetrical about the axis of the array. Because the acoustic surface wave energy is propagated in a guided mode, energy launched by pairs of electrodes with a short overlap rapidly spreads to fill the entire transducer aperture and a similar situation in reverse applies at the receiver.

REFERENCES:
patent: 4409571 (1983-10-01), Milsom et al.
de Klerk--"Ultrasonic Transducers: 3. Surface Wave Transducers", Ultrasonics, Jan. 1971; pp. 35-48.

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