Small ripple surface acoustic wave filter with low insertion los

Details Small ripple surface acoustic wave filter with low insertion los Small ripple surface acoustic wave filter with low insertion los

1984-08-01

1986-03-18

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Electromechanical filter

333193, 333196, H03H 964, H03H 9145

Patent

active

045771693

ABSTRACT:
A surface acoustic wave (SAW) filter is disclosed which exhibits both low insertion loss and small ripple in the passband, requirements which were considered mutually exclusive in the prior art. In accordance with the present invention, apodized group-type recessed electrodes are utilized to form the transducers. The grouping of the electrodes functions to reduce reflection between electrodes and apodization of the electrodes functions to increase the sideband rejection. However, merely combining these techniques is inadequate since the apodization process produces additional ripple between adjacent electrodes, thus increasing the passband ripple. By recessing the apodized groups of electrodes, this reflection is minimized and a SAW filter formed in accordance with the present invention is thus capable of providing both low insertion loss and small ripple with high sideband rejection.

REFERENCES:
patent: 4006438 (1977-02-01), Bennett
patent: 4013983 (1977-03-01), Hartemann
patent: 4128819 (1978-12-01), Shiokawa et al.
patent: 4130813 (1978-12-01), Sandy et al.
patent: 4237433 (1980-12-01), Tanski
patent: 4276524 (1981-06-01), Kadota
patent: 4308510 (1981-12-01), Yamada et al.
patent: 4353046 (1982-10-01), Hartmann
patent: 4429246 (1984-01-01), Miyajima
patent: 4499440 (1985-02-01), Grudkowski
"Interdigital Electrode Configurations . . . ", Reports of 1975 Spring Meeting Acoustical Society of Japan, May 1975, H. Sato et al., pp. 305-306.
"Low Sidelobe SAW Filters . . . ", 1977 Ultrasonic Symposium Proceedings, Oct. 1977, A. J. Slobodnik et al., pp. 757-762.
"A Low Loss Medium Bandwidth . . . ", 1978 Ultranics Symposium Proceedings, Sep. 1978, R. C. Peach et al., pp. 509-512.
"Surface Acoustic Wave . . . ", IEEE Trans. on Sonics and Ultrasonics, vol. SU-26, No. 2, Mar. 1979, W. Tanski, pp. 93-104.
"Use of Apodized Metal Gratings . . . ", 1980 Ultrasonics Symposium Proceedings, Nov. 1980, G. W. Judd et al., pp. 343-347.
"Frequency Sidelobes Generated by . . . ", 1982 Ultrasonics Symposium Proceedings, Oct. 1982, W. A. Porter et al., pp. 35-39.
"SAW Filters Using Group-Type . . . ", ibid, R. C. Bray et al., pp. 227-232.

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