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US 8,049,583 B2Granted
Acoustic wave filter comprising a reflector having an oblique slit
AssigneeTaiyo Yuden Co., Ltd.
InventorsKouta Ohkubo, Yasufumi Kaneda
Life of this patent
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Abstract
An acoustic wave filter includes a piezoelectric substrate, an IDT (interdigital transducer) formed on the piezoelectric substrate, and reflectors located at both sides of the IDT and composed of electrode fingers, at least one of the electrode fingers of at least one of the reflectors including at least one gap within a propagation path of an acoustic wave.
Claims16
An acoustic wave filter comprising:
- a piezoelectric substrate;
- an IDT (interdigital transducer) formed on the piezoelectric substrate;
- and
- reflectors located at both sides of the IDT and composed of electrode fingers,
- at least one of the electrode fingers of at least one of the reflectors including at least one gap within a propagation path of an acoustic wave,
- wherein the electrode fingers of the at least one of the reflectors have gaps so that the gaps of neighboring electrode fingers form an oblique slit with respect to a direction of propagation of the acoustic wave and the oblique slit is in at least a part of one of the reflectors.
3 more elements
An acoustic wave filter, comprising:
- a piezoelectric substrate;
- an IDT (interdigital transducer) formed on the piezoelectric substrate;
- and
- reflectors located at both sides of the IDT and composed of electrode fingers,
- at least one of the electrode fingers of at least one of the reflectors including at least one gap within a propagation path of an acoustic wave,
- wherein the electrode fingers of the reflectors have gaps so as to form an oblique slit in each of the reflectors with respect to a direction of propagation of the acoustic wave, and
- wherein the oblique slits in the reflectors are not mirror symmetrical with each other in a direction perpendicular to the direction of propagation of the acoustic wave.
4 more elements
An acoustic wave filter, comprising:
- a piezoelectric substrate;
- an IDT (interdigital transducer) formed on the piezoelectric substrate;
- and
- reflectors located at both sides of the IDT and composed of electrode fingers,
- at least one of the electrode fingers of at least one of the reflectors including at least one gap within a propagation path of an acoustic wave,
- wherein the electrode fingers of the reflectors have gaps so as to form oblique slits in each of the reflectors with respect to a direction of propagation of the acoustic wave, and
- wherein the oblique slits in the reflectors are not mirror symmetrical with each other in a direction perpendicular to the direction of propagation of the acoustic wave.
4 more elements
Dependencies are inferred from the claim text.