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US 2025/0015776 A1Published application
Surface acoustic wave (saw) structures with transverse mode suppression
AssigneeQorvo US, Inc.
InventorsTsuyoshi Yokoyama, Tabito Tanaka, Jun Sung Chun
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Abstract
Surface acoustic wave (SAW) structures with transverse mode suppression are disclosed. In one aspect, the SAW structure provides digits or fingers with broad interior terminal end shapes. By providing such shapes, spurious modes above the resonance frequency of the SAW are suppressed, thereby providing desired out-of-band rejection that helps satisfy design criteria such as keeping a higher Q value, a higher K2 value, and a better Temperature Coefficient of Frequency (TCF).
Claims11
A method of filtering a signal with a surface acoustic wave (SAW) filter, the method comprising:
- passing a signal into a first interdigitated electrode comprising a first plurality of fingers, each finger of the first plurality comprising a substantially uniform first width along a longitudinal axis of the finger for a first length and a second width along the longitudinal axis of the finger for a second length at a terminal end portion of the finger;
- exciting a piezoelectric material with the signal only through the first plurality of fingers;
- and
- receiving a filtered signal from the piezoelectric material at all fingers of a second interdigitated electrode comprising a second plurality of second fingers, each second finger of the second plurality comprising a substantially uniform third width along a second longitudinal axis of the second finger for a third length and a fourth width along the second longitudinal axis of the second finger for a fourth length at a second terminal end of the second finger,
- wherein each of the first plurality of fingers has a respective opposite one of the second plurality of second fingers, and each pair of first finger and second finger has a gap therebetween.
2 more elements
A surface acoustic wave (SAW) filter comprising:
- a first interdigitated electrode comprising a first plurality of adjacent fingers, each adjacent finger of the first plurality comprising:
- a substantially uniform first width along a longitudinal axis of the adjacent finger for a first length and a second width along the longitudinal axis of the adjacent finger for a second length at a terminal end portion of the adjacent finger;
- and
- a second interdigitated electrode comprising a second plurality of second adjacent fingers, each second adjacent finger of the second plurality comprising:
- a substantially uniform third width along a second longitudinal axis of the second adjacent finger for a third length and a fourth width along the second longitudinal axis of the second adjacent finger for a fourth length at a second terminal end of the second adjacent finger;
- wherein each of the first plurality of adjacent fingers has a respective opposite one of the second plurality of second adjacent fingers, and each pair of first adjacent fingers and second adjacent fingers has a gap therebetween.
3 more elements
A mobile communication device comprising:
- a transmitter comprising a surface acoustic wave (SAW) filter comprising:
- a first interdigitated electrode comprising a first plurality of adjacent fingers, each adjacent finger of the first plurality comprising:
- a substantially uniform first width along a longitudinal axis of the adjacent finger for a first length and a second width along the longitudinal axis of the adjacent finger for a second length at a terminal end portion of the adjacent finger;
- and
- a second interdigitated electrode comprising a second plurality of second adjacent fingers, each second adjacent finger of the second plurality comprising:
- a substantially uniform third width along a second longitudinal axis of the second adjacent finger for a third length and a fourth width along the second longitudinal axis of the second adjacent finger for a fourth length at a second terminal end of the second adjacent finger;
- wherein each of the first plurality of adjacent fingers has a respective opposite one of the second plurality of second adjacent fingers, and each pair of first adjacent fingers and second adjacent fingers has a gap therebetween.
4 more elements
Dependencies are inferred from the claim text.