Saw structure having serially coupled transducers with overlappi

Details Saw structure having serially coupled transducers with overlappi Saw structure having serially coupled transducers with overlappi

1992-10-19

1994-11-08

Lee, Benny

Wave transmission lines and networks

Coupling networks

Electromechanical filter

310313B, 310313D, H03H 964

Patent

active

053630742

ABSTRACT:
A SAW resonator/filter structure (300) includes a transducer portion. The transducer portion includes a plurality of acoustically coupled sub-transducer portions (310 and 312) comprising conductive patterns having interdigitated open-ended fingers. The sub-transducer portions (310 and 312) are electrically coupled to each other in series in order to increase the port impedance of the SAW filter structure (300) while providing the widest bandwidth.

REFERENCES:
patent: 3675054 (1972-07-01), Jones et al.
patent: 3801935 (1974-04-01), Mitchell
patent: 4223284 (1980-09-01), Inoue et al.
patent: 4321567 (1982-03-01), Sandy
patent: 4384264 (1983-05-01), Kadota
patent: 4494031 (1985-01-01), Barnes et al.
patent: 4635008 (1987-01-01), Solie
Lakin, Kenneth, et al.; "A New Interdigital Electrode Transducer Geometry" IEEE Trans on Microwave Theory & Techniques; vol. MTT 22; No. 8; Aug. 1974; pp. 763-768.

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