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US 4,237,433 AGranted
Surface acoustic wave resonators with integrated internal coupler reflectors
AssigneeSperry Corporation
InventorWilliam J. Tanski
Life of this patent
Estimating the term…
Abstract
A multiple track acoustic surface wave filter processes input signals successively flowing in coupled resonant acoustic tracks, each track being realized between pairs of surface wave reflectors in the surface of a planar piezoelectric substrate. The acoustic surface wave reflection and coupling devices are at least partially integrated so as to reduce the length of the structure.
Claims7
Signal processing apparatus comprising:
- substrate means for propagating acoustic waves at a surface thereof,
- first transducer means for launching an acoustic wave along a first propagation track at said surface,
- second transducer means for receiving an acoustic wave propagating along a second propagating track at said surface and spaced from said first propagation track, and
- first and second reflector-coupler means on opposite sides of said first and second transducers means at least in part extending across said first and second propagation tracks for forming coupled first and second respective resonator means,
- said reflector-coupler means including a regular array of parallel grooves in said surface disposed at right angles to said first and second propagation tracks, each said parallel groove including a thin metal layer disposed at the bottom thereof, said parallel grooves being of equal length,
- said lengths of said thin metal layers varying from a maximum adjacent said first and second transducer means to a minimum at the opposed end of said reflector-coupler means.
3 more elements
Signal processing apparatus comprising:
- substrate means for propagating acoustic waves at a surface thereof,
- first transducer means for launching an acoustic wave along a first propagation track at said surface,
- second transducer means for receiving an acoustic wave propagating along a second propagating track at said surface and spaced from said first propagation track, and
- first and second reflector-coupler means on opposite sides of said first and second transducer means at least in part extending across said first and second propagation tracks for forming coupled first and second respective resonator means,
- said reflector-coupler means including a regular array of parallel grooves in said surface disposed at right angles to said first and second propagation tracks,
- said first and second reflector-coupler means comprising:
- coupler means comprising a first regular array of parallel grooves in said surface disposed at right angles to said first and second propagation tracks,
- first and second separate reflector means spaced from said coupler means opposite said first and second transducer means and comprising second and third regular arrays of parallel grooves in said surface disposed at right angles to said first and second propagation tracks.
5 more elements
Dependencies are inferred from the claim text.