Wave transmission lines and networks – Coupling networks – Delay lines including elastic surface wave propagation means
Patent
1972-08-02
1986-03-11
Nussbaum, Marvin L.
Wave transmission lines and networks
Coupling networks
Delay lines including elastic surface wave propagation means
310313B, 333196, H03H 9145, H03H 925
Patent
active
045756961
ABSTRACT:
Disclosed is a unidirectional interdigitated surface wave transducer having at least three discrete arrays of conductive elements, each array comprising, in a comb-like structure, a plurality of electrodes electrically interconnected in parallel and having a periodicity corresponding to one acoustic wavelength of the resonance frequency of the transducer. The discrete arrays of electrodes are deposited upon a piezoelectric substrate in an interleaved pattern to define an interdigitated transducer. Respective electrodes of a given array are substantially equidistantly spaced apart from electrodes of the other arrays and are electrically insulated therefrom. The arrays of electrodes are positioned upon the substrate such that there are at least three electrodes per acoustic wavelength at the resonance frequency. A voltage of different phase is simultaneously applied to each array of electrodes by means of novel broadband phase shifting circuits to generate an acoustic wave that propagates in only one direction along the substrate.
REFERENCES:
patent: 1917291 (1933-07-01), Beverage et al.
patent: 3041547 (1962-06-01), Lehmann et al.
patent: 3686518 (1972-08-01), Hartmann et al.
Hartmann Clinton S.
Jones William S.
Comfort James T.
Hiller William E.
Nussbaum Marvin L.
Sharp Melvin
Texas Instruments Incorporated
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