Wave transmission lines and networks – Coupling networks – Electromechanical filter
Patent
1980-09-18
1982-06-22
Nussbaum, Marvin L.
Wave transmission lines and networks
Coupling networks
Electromechanical filter
333153, 333196, H03H 9135, H03H 964
Patent
active
043365140
ABSTRACT:
A surface acoustic wave reflective array of the kind in which parallel rows of scatterers produce Bragg reflection of an incident wave in a wanted direction at a given frequency determined by the row spacing. The rows (4) are formed of scattering centers, eg metallized dots (11) divisible into unit structures (10) each containing a group of at least two such centers; the orientation and relative spacings (in terms of the Bragg wavelength) of the centers within each unit, relative to the direction (Z) of an incident beam, are such that the scattered waves constructively interfere in the wanted direction (X) while avoiding constructive interference in other directions. The scattering centers of each unit structure may be in the same row or in adjacent rows. The invention alleviates a disadvantage of existing reflective dot arrays, which tend additionally to produce reflections in unwanted directions.
REFERENCES:
patent: 4055820 (1977-10-01), Solie
patent: 4146852 (1979-03-01), Godfrey et al.
patent: 4155056 (1979-05-01), Cross et al.
patent: 4210883 (1980-07-01), Shah et al.
patent: 4267534 (1981-05-01), Tanski
Solie-"A Saw Filter Using a Reflective Dot Array", 1976, Ultrasonics Symposium Proceedings, Anapolis, MD, U.S.A., Sep. 29-Oct. 1, 1976, pp. 309-312.
National Research Development Corporation
Nussbaum Marvin L.
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