Wave transmission lines and networks – Coupling networks – Electromechanical filter
Patent
1996-08-27
1998-10-06
Pascal, Robert J.
Wave transmission lines and networks
Coupling networks
Electromechanical filter
310313C, 310313B, H03H 964, H03H 9145
Patent
active
058183108
ABSTRACT:
Surface acoustic wave (SAW) filter performance is enhanced using series-block weighting and line-width weighting combined for providing a transducer having a finely adjusted uniform weighting across the beam profile. Such a transducer permits practical transducer pairing within a surface acoustic wave filter, as well as use with transducers requiring uniform weighting, such as transducers employing apodized weighting. A three electrode per wavelength transducer electrode finger geometry includes line-width weighting for providing a fine weighting control to complement the inherently coarse weighting control of the series-block weighted transducer. Selected transducer geometries including three electrode per wavelength structures are employed for use in wide band tapered electrode finger SAW devices.
REFERENCES:
patent: 3675054 (1972-07-01), Jones et al.
patent: 3870975 (1975-03-01), Vasile
patent: 4114116 (1978-09-01), Reeder
patent: 4162465 (1979-07-01), Hunsinger et al.
patent: 4203082 (1980-05-01), Tsukamoto et al.
patent: 4316161 (1982-02-01), Moore et al.
patent: 4321567 (1982-03-01), Sandy
patent: 4321696 (1982-03-01), Kanda
patent: 4331840 (1982-05-01), Murphy et al.
patent: 4348904 (1982-09-01), Bautista, Jr.
patent: 4384264 (1983-05-01), Kadota
patent: 4449107 (1984-05-01), Asai et al.
patent: 4480209 (1984-10-01), Okamoto et al.
patent: 4486724 (1984-12-01), Schofield
patent: 4516049 (1985-05-01), Mikoshiba et al.
patent: 4600905 (1986-07-01), Fredricksen
patent: 4602228 (1986-07-01), Yamada
patent: 4625184 (1986-11-01), Niitsuma et al.
patent: 4635008 (1987-01-01), Solie
patent: 4672592 (1987-06-01), Skinner
patent: 4746882 (1988-05-01), Solie
patent: 4767198 (1988-08-01), Solie et al.
patent: 4908542 (1990-03-01), Solie
patent: 4973875 (1990-11-01), Yatsuda
patent: 5075652 (1991-12-01), Sugai
patent: 5289073 (1994-02-01), Mariani
"Weighting Interdigital Surface Wave Transducers by Selective Withdrawal of Electrodes," C.S. Hartmann, Texas Instruments Incorporated, 1973 Ultrasonics Symposium Proceedings, pp. 423-426.
"Capacitive Tap Weighted SAW Transducers," D.C. Malocha and Bill J. Hunsinger, IIEE Transactions on Sonics and Ultrasonics, vol. SU-24, No. 5, Sep. 1977, pp. 293-301.
"Matching of Single-Phase Unidirectional SAW Transducers and a Demonstration Using a Low-Loss EWC/SPUDT Filter," B.P. Abbott, C.S. Hartmann, and D.C. Malocha, University of Central Florida, 1990 Ultrasonics Symposium Proceedings, pp. 49-54.
"Wide Band Linear Phase SAW Filters Using Apodized Slanted Finger Transducers," P.M. Naraine and C.K. Campbell, Ontario, Canada, 1983 Ultrasonics Symposium Proceedings, pp. 113-116.
"Improved Design of Single-Phase Unidirectional Transducers for Low-Loss Saw Filters," C.B. Saw and C.K. Campbell, Microwave Acoustics Laboratory, Dept. of Electrical and Computer Eng., McMaster Univ., Hamilton, Ont., Canada L8S 4L7 1987 Ultrasonics Symposium Proceedings, Oct. 14-16, 1987, pp. 169-172.
Pascal Robert J.
Sawtek Inc.
Summons Barbara
LandOfFree
Series-block and line-width weighted saw filter device does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Series-block and line-width weighted saw filter device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Series-block and line-width weighted saw filter device will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-82687