Wave transmission lines and networks – Coupling networks – Delay lines including elastic bulk wave propagation means
Patent
1992-10-23
1996-09-24
Pascal, Robert J.
Wave transmission lines and networks
Coupling networks
Delay lines including elastic bulk wave propagation means
333194, 310313R, H03H 964
Patent
active
055594816
ABSTRACT:
A SAW filter includes a first SAW resonator having a pair of terminals and a predetermined resonance frequency (f.sub.rp), the first SAW resonator being provided in a parallel arm of the SAW filter. A second SAW resonator has a pair of terminals and a predetermined resonance frequency (f.sub.rs) approximately equal to a predetermined antiresonance frequency of the first SAW resonator (f.sub.ap). The second SAW resonator is provided in a series arm of the SAW filter. An inductance element is connected in series to the first SAW resonator.
REFERENCES:
patent: Re32859 (1989-02-01), Marshall et al.
patent: 3582540 (1971-06-01), Adler et al.
patent: 4166258 (1979-08-01), Tseng
patent: 4295108 (1981-10-01), Ieki
patent: 4495431 (1985-01-01), Grudkowski
patent: 4625184 (1986-11-01), Niitsuma et al.
patent: 4684841 (1987-08-01), Este et al.
patent: 4694266 (1987-09-01), Wright
patent: 4734664 (1988-03-01), Hikita et al.
patent: 4978879 (1990-12-01), Satoh et al.
patent: 5039957 (1991-08-01), Greer et al.
patent: 5115216 (1992-05-01), Hikita et al.
"Active Development of SAW Resonator," Nikkei Electronics, Nov. 29, 1976, pp. 76 and 80.
"Theory and Design of Filters," Sangyo-Shuppan, pp. 192-203.
Y. Ebata et al., "SAW Resonator on LitaO.sub.3 Substrate and Application Thereof to Oscillator for VTR," Journal of the Institute of Electronics and Communication Engineers, vol. J66-C, No. 1, Jan. 1983, pp. 23-30.
G. Kuraishi, "Microwave Circuits," Tokyo Denki Daigaku Shuppan-Kyoku, p. 199.
O. Ikata et al., "Development of 800 MHz Band SAW Filters Using Weighting for the Number of Finger Pairs," 1990 Ultrasonics Symposium, pp. 83-86.
K. Yamanouchi et al., "Applications for Piezoelectric Leaky Surface Waves," 1990 Ultrasonics Symposium, pp. 11-13.
Patent Abstracts of Japan, vol. 15, No. 506 (E-1148) 20 Dec. 1991 & JP-A-3 220911 (Fujitsu) 30 Sep. 1991.
Ikata Osamu
Matsuda Takashi
Miyashita Tsutomu
Satoh Yoshio
Takamatsu Mitsuo
Fujitsu Limited
Gambino Darius
Pascal Robert J.
LandOfFree
Surface acoustic wave filter does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Surface acoustic wave filter, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Surface acoustic wave filter will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1931730