Surface-wave distributed acoustic reflection transducer and filt

Details Surface-wave distributed acoustic reflection transducer and filt Surface-wave distributed acoustic reflection transducer and filt

1996-10-15

1997-12-30

Dougherty, Thomas M.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

333154, 333195, H03H 9145

Patent

active

057034273

ABSTRACT:
The distributed acoustic reflection transducer has a reflection function which includes at least one reversal of sign, that is to say it possesses at least one reflector and, in general, a combination of reflectors, the center of which is at a distance of k.lambda./2+.lambda./4 from the center of the other reflectors, .lambda. being the wavelength corresponding to the central operating frequency of the transducer.
The applications will be for the production of surface-wave filters in radio communication systems.

REFERENCES:
patent: 4281301 (1981-07-01), Stevens et al.
patent: 4910839 (1990-03-01), Wright
patent: 5051644 (1991-09-01), Wright
patent: 5061871 (1991-10-01), Wright
patent: 5162689 (1992-11-01), Fliegel et al.
patent: 5212420 (1993-05-01), Hickernell et al.
patent: 5264751 (1993-11-01), Dufilie et al.
patent: 5270606 (1993-12-01), Cho et al.
patent: 5274345 (1993-12-01), Gau
patent: 5438306 (1995-08-01), Yamanouchi et al.
patent: 5550793 (1996-08-01), Dufilie
"900MHz Range Wideband Double Mode SAW Filters" by T. Morita et al., May 28, 1992.
"New Types of SAW Reflectors and Resonators Consisting of Reflecting Elements with Positive and Negative Reflection".
"Coefficients" by M. Takeuchi et al., IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, Jul. 4, 1986.

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