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    • 13. 发明公开
    • BULK ACOUSTIC RESONATOR AND METHOD FOR DESIGNING SAME, FILTER AND ELECTRONIC DEVICE
    • EP4142153A1
    • 2023-03-01
    • EP21792954.6
    • 2021-04-20
    • ROFS MICROSYSTEM (TIANJIN) CO., LTD.
    • ZHANG, QuandePANG, Wei
    • H03H9/58H03H9/17
    • A bulk acoustic resonator, an effective region of which has an effective area. In the effective region, a second end point (32') of an input side (31), a first end point (34') of an output side (34), a second end point (35') of the output side (34) and a first end point (31') of the input side (31) are successively connected to each other to define a basic quadrilateral, and the area of the quadrilateral is not greater than the effective area; in a convex polygon, the length of the input side (31) and the length of the output side (34) are within a range from more than 1.5 times the equivalent side length to less than 2.5 times the equivalent side length, and the equivalent side length is the length of sides of a regular pentagon of which the area is equivalent to the effective area; an interior angle (b21) where the second end point (32') of the input side (31) of the convex polygon is located is within a range of greater than 90°C and not greater than 150°C, and the other interior angles (b22, b23, b24, b25, b26) of the convex polygon are within a range of not less than 60° and not greater than 150°C, and an obtuse angle (a3) formed by a basic input side and a basic output side is within a range of not less than 110° and not greater than 170°. The present disclosure also relates to a method for designing the resonator, a filter and an electronic device.
    • 19. 发明公开
    • BULK ACOUSTIC RESONATOR WITH ELECTRODE HAVING VOID LAYER, AND FILTER AND ELECTRONIC DEVICE
    • EP4068628A1
    • 2022-10-05
    • EP20879253.1
    • 2020-05-06
    • Rofs Microsystem (Tianjin) Co., Ltd
    • PANG, WeiZHANG, MenglunXU, YangYANG, Qingrui
    • H03H9/02
    • The present disclosure relates to a bulk acoustic wave resonator. The resonator includes: a base, an acoustic lens, a bottom electrode, a top electrode, and a piezoelectric layer provided between the bottom electrode and the top electrode, wherein one of the bottom electrode and the top electrode is a first gap electrode; the first gap electrode is provided with a first electrode and a second electrode; the first electrode is in surface contact with the piezoelectric layer, the second electrode is away from the piezoelectric layer, and a gap layer is located between the first electrode and the second electrode in the thickness direction of the resonator; and the first electrode and the second electrode are electrically connected at an electrical connection portion, and the electrical connection portion defines at least part of a boundary of the gap layer. The resonator further includes an electrical isolation portion, wherein the projection of the electrical connection portion in the thickness direction of the resonator falls within the electrical isolation portion, and the inner side of the electrical isolation portion is used for defining a boundary of an active region of the resonator in the transverse direction of the resonator. The present disclosure further relates to a filter having the resonator and an electronic device having the filter or the resonator.