Wave transmission lines and networks – Automatically controlled systems – With control of equalizer and/or delay network
Patent
1976-09-13
1978-03-28
Smith, Alfred E.
Wave transmission lines and networks
Automatically controlled systems
With control of equalizer and/or delay network
310313, 333 30R, H03H 904, H03H 926, H03H 932, H01L 4110
Patent
active
040817695
ABSTRACT:
Acoustic surface wave resonator device having two sets of reflector arrays on a piezoelectric substrate with structurally modified coupling transducers interposed therebetween, wherein the transducers are coupled to the standing wave resonance in the resonance cavity but are respectively decoupled from the surface wave launched by the other transducer, thereby suppressing direct coupled response without materially affecting the resonance response. In a typical embodiment, a pair of interdigital transducers are disposed between two sets of reflector arrays on a piezoelectric substrate, with the fingers of the respective transducers including intermediate off-set portions thereof. Specifically, the intermediate off-set portion in each interdigital finger extends over a distance .lambda./4, with the space between successive fingers in a transducer being .lambda./2. The reflector arrays are spaced to set up a standing wave at resonance, and the transducers are so located to dispose the center line of each finger on the peak of the standing wave. The off-set portions in the fingers of the respective transducers extend in opposite directions so as to cause the wavefront of a wave launched by one transducer to have a 180.degree. phase shift along the length of the finger of the other transducer. The net change in the finger due to this wave is zero such that no signal is generated, thus suppressing the transducer response.
REFERENCES:
patent: 3886504 (1974-05-01), Hartmann et al.
patent: 3931597 (1976-01-01), Cho et al.
patent: 3955159 (1976-05-01), Mitchell et al.
patent: 3961293 (1976-06-01), Hartmann et al.
Comfort James T.
Elacqua James J.
Grossman Rene E.
Nussbaum Marvin
Smith Alfred E.
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