Tunable surface wave device resonator
AssigneeTexas Instruments Incorporated
InventorsClinton S. Hartmann, Robert E. Stigall
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Abstract
A tunable surface wave resonator is disclosed comprising a substrate of piezoelectric material having acoustic surface wave absorbing extremities, a pair of spaced acoustic surface wave gradient reflectors positioned adjacent to the absorbing extremities of the substrate, a pair of spaced multiphase surface wave tuning transducers selectively positioned between the pair of gradient reflectors over antinode positions of desired resonant frequency standing wave, and an acoustic surface wave transducer selectively placed for optimum coupling of energy into the acoustic resonant cavity formed by the pair of gradient reflectors.
Claims18
A tunable surface wave resonator comprising:
- a piezoelectric substrate;
- a pair of reflector arrays on said substrate, said reflector arrays being aligned in spaced parellel relation to each other and respectively disposed at the opposite outer extremities of said substrate so as to provide a multiresonant cavity therebetween;
- each of said reflector arrays comprising a plurality of spaced parallel discontinuities formed on said substrate,
- tuning means formed on the substrate in the miltiresonant cavity, said tuning means being independent of said reflector arrays and selectively positioned as to the reflector arrays to provide selective uniform tuning for all modes of the multiresonant cavity;
- and
- surface acoustic wave transducer means formed on said substrate and disposed between said tuning means and operably associated therewith to generate standing waves at a desired resonant frequency.
A tunable surface wave resonator comprising:
- a piezoelectric substrate;
- surface wave reflector means formed on said substrate, said reflector means forming with the substrate a multiresonant cavity;
- tuning means formed on the substrate in the multiresonant cavity;
- said tuning means selectively positioned as to the reflector means to provide selective uniform tuning for all modes of the multiresonant cavity and comprising a pair of spaced multiphase surface wave tuning transducers having three or more phases;
- and
- surface acoustic wave transducer means formed on said substrate between said pair of spaced multiphase surface wave tuning transducers and operable to generate standing waves at a desired resonant frequency.
Dependencies are inferred from the claim text.