Method and apparatus for surface acoustic wave reflector grating
AssigneeMotorola, Inc.
InventorsThomas S. Hickernell, David Penunuri, Frederick Y. Cho
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Abstract
An acoustic wave device comprises an acoustic wave transducer coupled to an acoustic wave propagating substrate. The acoustic wave transducer converts signal energy between electrical and acoustical forms. Acoustic reflectors are placed one on either side of the acoustic wave transducer. The acoustic reflectors are composed of acoustic reflection elements spaced approximately one wavelength apart, and provide enhanced acoustic acoustic reflections together with relaxed fabrication constraints.
Claims22
An acoustic wave device comprising:
- an acoustic wave propagating substrate;
- a first acoustic wave transducer coupled to said acoustic wave propagating substrate, said first acoustic wave transducer for converting energy between electrical and acoustical form;
- and
- a first and a second acoustic reflector coupled to said acoustic wave propagating substrate, said first acoustic reflector disposed on one side of said first acoustic wave transducer, said second acoustic reflector disposed on another side of said first acoustic wave transducer, said first and second acoustic reflectors for reflecting acoustical energy, each of said first and second acoustic reflectors including a plurality of acoustic reflection elements wherein there is a single acoustic reflection element per acoustic wavelength.
A method for making an electro-acoustic device comprising the steps of:
- providing an acoustic wave propagating substrate;
- and
- disposing a first acoustic wave transducer and a first and a second acoustic reflector on the acoustic wave propagating substrate, wherein each of said first and second acoustic reflectors comprises a plurality of reflection elements located on the acoustic wave propagating substrate, the first acoustic reflector being positioned to one side of the first acoustic wave transducer, the second acoustic reflector being positioned to another side of the first acoustic wave transducer, wherein the plurality of reflection elements have a periodicity of one reflection element per an acoustic wavelength.
An acoustic wave device comprising:
- an acoustic wave propagating substrate of 128.degree. Y-rotated, X-propagating lithium niobate;
- a first acoustic wave transducer coupled to said acoustic wave propagating substrate, said first acoustic wave transducer for converting energy between electrical and acoustical form;
- and
- a first and a second acoustic reflector coupled to said acoustic wave propagating substrate, said first acoustic reflector disposed to one side of said first acoustic wave transducer, said second acoustic reflector disposed to another side of said first acoustic wave transducer, said first and second acoustic reflectors wherein there is a single acoustic reflection element per acoustic wavelength.
Dependencies are inferred from the claim text.