Acoustic wave element and communication apparatus
AssigneeKYOCERA Corporation
InventorsTetsuya Kishino, Tsuyoshi Nakai
Life of this patent
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Abstract
An acoustic wave element includes an IDT electrode includes pluralities of electrode fingers, and reflector electrodes on the two sides of the IDT electrode. The IDT electrode includes a major part and at least one end part which is located between the major part and one of the reflector electrodes and is arranged along a direction of propagation of an acoustic wave together with the major part. the at least one end part includes a pitch of the plurality of electrode fingers substantially the same as a pitch of the plurality of electrode fingers in the major part, is electrically connected in parallel with respect to the major part, and is divided into two or more sections which are electrically connected in series with each other.
Claims12
An acoustic wave element, comprising:
- an IDT electrode comprising a plurality of electrode fingers;
- and
- reflector electrodes on the two sides of the IDT electrode, wherein
- the IDT electrode comprises
- a major part and
- at least one end part which is located between the major part and one of the reflector electrodes and is located along a direction of propagation of an acoustic wave together with the major part,
- the at least one end part,
- comprises a pitch of the plurality of electrode fingers, the pitch being substantially the same as a pitch of the plurality of electrode fingers in the major part,
- is electrically connected in parallel with respect to the major part, and
- is divided into two or more sections along the direction of propagation of the acoustic wave, the two or more sections being electrically connected in series with each other,
- the two or more sections comprise
- a first section adjacent to the major part in the direction of propagation, and
- a second section adjacent to the first section in the direction of propagation,
- the IDT electrode comprises two bus bars which face each other in a direction crossing the direction of propagation,
- one bus bar of the two bus bars is divided in the direction of propagation at a boundary between the major part and the first section, and
- another bus bar of the two bus bars is divided in the direction of propagation at a boundary between the first section and the second section.
An acoustic wave element, comprising:
- an IDT electrode comprising pluralities of electrode fingers;
- and
- reflector electrodes on the two sides of the IDT electrode, wherein
- the IDT electrode comprises
- a major part and
- at least one end part which is located between the major part and one of the reflector electrodes and is located along a direction of propagation of an acoustic wave together with the major part,
- the at least one end part,
- comprises a pitch of the plurality of electrode fingers, the pitch being substantially the same as a pitch of the plurality of electrode fingers in the major part,
- is electrically connected in parallel with respect to the major part, and
- is divided into two or more sections in a direction different from the direction of propagation of the acoustic wave, the two or more sections being electrically connected in series with each other,
- the major part comprises
- a first bus bar and a second bus bar which face each other in a direction crossing the direction of propagation,
- a plurality of a first electrode fingers which extend from the first bus bar toward the second bus bar,
- a plurality of a second electrode fingers which extend from the second bus bar toward the first bus bar, and which mesh with the plurality of the first electrode fingers,
- when viewed in the direction of propagation, a plurality of electrode fingers of each of the two or more sections of the at least one end part overlap the plurality of first electrode fingers and the plurality of second electrode fingers of the major part.
Dependencies are inferred from the claim text.