Tuned unidirectional surface wave transducer

Details Tuned unidirectional surface wave transducer Tuned unidirectional surface wave transducer

1978-06-30

1980-04-29

Smith, Alfred E.

Wave transmission lines and networks

Coupling networks

Electromechanical filter

310313, 333151, 333196, H03H 904, H03H 920, H03H 926, H01L 4110

Patent

active

042008492

ABSTRACT:
A surface acoustic wave device having a unidirectional input transducer is provided with an input tuning circuit which eliminates the reactive portions of the device's input impedance. The input transducer has a pair of input ports, each of which exhibits an impedance A.angle..phi.. A series tuning circuit including reactances having a magnitude of A(sin.phi.+cos.phi.) and A(sin.phi.-cos.phi.) respectively, is connected to the input ports. An alternative parallel reactive tuning circuit is disclosed whose reactances are A/(sin.phi.+cos.phi.) and A/(sin.phi.-cos.phi.) respectively.

REFERENCES:
patent: 3866154 (1975-02-01), Moore
Kimbark-"Electrical Transmission of Power and Signals," John Wiley & Sons, New York, 1958, pp. 220-223.

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