Wave transmission lines and networks – Coupling networks – Electromechanical filter
Patent
1978-08-03
1981-06-30
Nussbaum, Marvin L.
Wave transmission lines and networks
Coupling networks
Electromechanical filter
333193, 333196, H03H 9145, H03H 964
Patent
active
042765242
ABSTRACT:
An acoustic surface wave device comprises transducers including interdigital electrodes formed on the surface of a piezoelectric material substrate, wherein an electrical signal is converted into an acoustic surface wave and vice versa. A pair of interdigital electrodes are provided, one constituting an input transducer and the other constituting an output transducer. One of the input and output transducers is formed as a normal type of interdigital electrode. The other interdigital electrode has been apodized by changing overlapping lengths of the adjacent electrode fingers to get a desired pass characteristic. Most fingers of the other interdigital electrode are adapted to have the width of 3/8.lambda..sub.0 and disposed with the electrode pitch of 1/2.lambda..sub.0. The electrode fingers are disposed such that two fingers of different potentials are faced at the free ends and each facing free end is adapted to have a protruding electrode portion having the width of 1/8.lambda..sub.0.
REFERENCES:
patent: 3801937 (1974-04-01), Bristol
patent: 4160219 (1979-07-01), Kuny
Mitchell et al.-"Synthesis of Acoustic-Surface-Wave Filters Using Double Electrodes" in Electronics Letters 28 Nov. 74; p. 512.
Chao et al.-"Design Considerations for Nonsymmetrical Filters", 1975 Ultrasonic Symposium Proceedings, IEEE Cat. #CHO 994-4SU; pp. 331-333.
Murata Manufacturing Co. Ltd.
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-2434541