Acoustic surface wave device

Details Acoustic surface wave device Acoustic surface wave device

1977-06-23

1979-03-27

Smith, Alfred E.

Wave transmission lines and networks

Coupling networks

Electromechanical filter

333195, 333153, H03H 926, H03H 932, H03H 930, H01L 4110

Patent

active

041468511

ABSTRACT:
A sidestepping acoustic surface wave filter device employing a 3 dB multistrip coupler between the input transducer and the offset output transducer. A reflector is located across the track associated with the input transducer in the region adjacent to the output transducer. The 3 dB coupler causes the output transducer and the reflector to receive equal acoustic surface wave energy. The reflector is designed so that the energy reflected by it is equal to the energy returned by the output transducer. Phase shifts produced in the returning acoustic surface waves by the coupler cause the returning acoustic surface waves to be suppressed in the track associated with the input transducer. Thus, triple transit signals are avoided.

REFERENCES:
patent: 3662293 (1972-05-01), De Vries
patent: 3727155 (1973-04-01), De Vries
patent: 4038614 (1977-07-01), Chapman et al.
patent: 4048594 (1977-09-01), Weglein

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