Filter combining surface acoustic wave resonators

Details Filter combining surface acoustic wave resonators Filter combining surface acoustic wave resonators

1987-11-18

1989-02-07

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Electromechanical filter

310313R, 333196, H03H 964, H03H 925

Patent

active

048034495

ABSTRACT:
This invention relates to the structure of a band-pass or band-rejection filters by combining a plurality of one-port surface acoustic wave resonators whose interdigital electrode fingers are disposed on a piezoelectric substrate. The filter combining surface acoustic wave resonators of the present invention consists of a series circuit of the one-port surface acoustic wave resonators disposed on a piezoelectric substrate for transmitting elastic surface wave and a plurality of circuit elements containing capacitance elements, and one-port surface acoustic wave resonators disposed between the electrodes of the plurality of circuit elements and the common ground. This structure can accomplish a filter having a low loss, high power handling capability and high design freedom of rejection- and passing-band.

REFERENCES:
patent: 3716809 (1973-02-01), Reeder
patent: 4166258 (1979-08-01), Tseng
patent: 4577168 (1986-03-01), Hartmann
Ishihara et al.--"Narrow Band Filters Using Surface Acoustic Wave Resonators", IEEE Ultrasonics Symposium Proceedings, IEEE Cat. #75 CHO 994-4Su, 1975; pp. 381-384.
Koyamada et al.--"Elastic Surface Wave Band Elimination Filters", Spring Meeting of Acoustical Society of Japan, 1974; pp. 531-532.
Ash--"Surface Wave Gratings Reflectors and Resonators", IEEE Microwave Symposium Proceedings, 1970; pp. 385-386.
Slobodnic, Jr. et al.--"Miniature Surface-Acoustic Wave Filters", Proceedings of the IEEE, vol. 67, No. 1, Jan. 1979; p. 129.

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