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US 2003/0117240 A1Published application
Surface acoustic wave resonator and surface acoustic wave filter
AssigneeFujitsu Media Devices Limited
InventorsShogo Inoue, Jun Tsutsumi, Takashi Matsuda, Osamu Ikata
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Abstract
A surface acoustic wave resonator includes a piezoelectric substrate, and a SAW resonator having an interdigital transducer. The interdigital transducer satisfies 0.15L≦W≦0.45L where W is the total of widths of all electrode fingers that form the interdigital transducer, and L is a length of the said interdigital transducer in a direction of SAW propagation.
Claims17
A surface acoustic wave resonator comprising:
- a piezoelectric substrate;
- and
- an acoustic wave (SAW) resonator having at least one interdigital transducer,
- wherein said at least one interdigital transducer satisfies:
- 0.15L≦W≦0.45L
- where W is the total of widths of all electrode fingers that form said at least one interdigital transducer, and L is a length of said at least one interdigital transducer in a direction of SAW propagation.
3 more elements
A surface acoustic wave filter comprising:
- a piezoelectric substrate;
- and
- surface acoustic wave (SAW) resonators that are formed on the piezoelectric substrate and are electrically connected in series,
- each of the SAW resonators having at least one interdigital transducer that satisfies:
- 0.15L≦W≦0.45L
- where W is the total of widths of all electrode fingers that form the interdigital transducer, and L is a length of said at least one interdigital transducer in a direction of SAW propagation.
3 more elements
A surface acoustic wave filter comprising:
- a piezoelectric substrate;
- and
- surface acoustic wave (SAW) resonators that are formed on the piezoelectric substrate and are electrically connected in series,
- the SAW resonators including a SAW resonator having at least one interdigital transducer that satisfies:
- 0.15L≦W≦0.45L
- where W is the total of widths of all electrode fingers that form said at least one interdigital transducer, and L is a length of said at least one interdigital transducer in a direction of SAW propagation.
3 more elements
A surface acoustic wave filter comprising:
- a double mode type surface acoustic wave (SAW) filter and a SAW resonator electrically connected thereto, said SAW resonator comprising a piezoelectric substrate, and an acoustic wave (SAW) resonator having at least one interdigital transducer,
- wherein said at least one interdigital transducer satisfies:
- 0.15L≦W≦0.45L
- where W is the total of widths of all electrode fingers that form said at least one interdigital transducer, and L is a length of said at least one interdigital transducer in a direction of SAW propagation.
1 more element
Dependencies are inferred from the claim text.