Wave transmission lines and networks – Coupling networks – Delay lines including elastic surface wave propagation means
Patent
1980-02-01
1981-05-12
Nussbaum, Marvin L.
Wave transmission lines and networks
Coupling networks
Delay lines including elastic surface wave propagation means
310313B, 333154, 333194, H03H 942, H03H 9145, H03H 964
Patent
active
042675332
ABSTRACT:
An acoustic surface wave device including a three-phase unidirectional transducer. The transducer has three sets of interdigitated electrodes. The first and second sets of electrodes are each connected to bus bars, one on each side of the central axis of the transducer. The electrodes of the third set are connected to two bus bars one on each side of the central axis. The structure of the third set of electrodes and the bus bars connected thereto is symmetrical with respect to the central axis. The balanced structure of the transducer permits simplified impedance-matching and phase-shifting networks for enabling three-phase unidirectional operation of the transducer from a single phase electrical source.
REFERENCES:
patent: 3866154 (1975-02-01), Moore
patent: 4087714 (1978-05-01), La Rosa et al.
patent: 4200849 (1980-04-01), Malocha
Hartmann et al.-"Wideband Unidirectional Interdigital Surface Wave Transducers", IEEE Trans. Sonics and Ultrasonics, SU-9, No. 3, Jul. 1972, pp. 378-381 .
Rosenfeld et al.-"Unidirectional Acoustic Surface Wave Filters with 2 DB Insertion Loss", IEEE Ultrasonics Symposium Proceedings, Cat. No. 74 CHO 896-ISU, 1974, pp. 425-428.
Toda et al.-"Surface-Wave Devices Using Three-Phase Interdigital Transducers", Ferroelectrics, vol. 9, pp. 33-37.
Malocha-"Quadrature 3 Phase Unidirectional Transducer", IEEE Trans. Sonics and Ultrasonics, SU-26, No. 4., Jul. 1979, pp. 212-215.
Yamanouchi et al.-"Low Insertion Loss Acoustic Surface Wave Filter Using Group-Type Unidirectional Interdigital Transducer", IEEE Ultrasonics Symposium Proc., Cat No. 75 CHO 994-4SU, 1975, pp. 317-321.
Dempsey Martin E.
Lee Ching W.
GTE Laboratories Incorporated
Keay David M.
Nussbaum Marvin L.
LandOfFree
Acoustic surface wave 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 Acoustic surface wave device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Acoustic surface wave device will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2049826