JP6441761B2 - 圧電薄膜共振器及びフィルタ - Google Patents
圧電薄膜共振器及びフィルタ Download PDFInfo
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Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/02—Details
- H03H9/02007—Details of bulk acoustic wave devices
- H03H9/02015—Characteristics of piezoelectric layers, e.g. cutting angles
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/02—Details
- H03H9/02007—Details of bulk acoustic wave devices
- H03H9/02086—Means for compensation or elimination of undesirable effects
- H03H9/02118—Means for compensation or elimination of undesirable effects of lateral leakage between adjacent resonators
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/02—Details
- H03H9/125—Driving means, e.g. electrodes, coils
- H03H9/13—Driving means, e.g. electrodes, coils for networks consisting of piezoelectric or electrostrictive materials
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/15—Constructional features of resonators consisting of piezoelectric or electrostrictive material
- H03H9/17—Constructional features of resonators consisting of piezoelectric or electrostrictive material having a single resonator
- H03H9/171—Constructional features of resonators consisting of piezoelectric or electrostrictive material having a single resonator implemented with thin-film techniques, i.e. of the film bulk acoustic resonator [FBAR] type
- H03H9/172—Means for mounting on a substrate, i.e. means constituting the material interface confining the waves to a volume
- H03H9/173—Air-gaps
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/15—Constructional features of resonators consisting of piezoelectric or electrostrictive material
- H03H9/17—Constructional features of resonators consisting of piezoelectric or electrostrictive material having a single resonator
- H03H9/171—Constructional features of resonators consisting of piezoelectric or electrostrictive material having a single resonator implemented with thin-film techniques, i.e. of the film bulk acoustic resonator [FBAR] type
- H03H9/172—Means for mounting on a substrate, i.e. means constituting the material interface confining the waves to a volume
- H03H9/174—Membranes
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/15—Constructional features of resonators consisting of piezoelectric or electrostrictive material
- H03H9/17—Constructional features of resonators consisting of piezoelectric or electrostrictive material having a single resonator
- H03H9/171—Constructional features of resonators consisting of piezoelectric or electrostrictive material having a single resonator implemented with thin-film techniques, i.e. of the film bulk acoustic resonator [FBAR] type
- H03H9/172—Means for mounting on a substrate, i.e. means constituting the material interface confining the waves to a volume
- H03H9/175—Acoustic mirrors
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- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
Description
12 下部電極
14 圧電膜
16 上部電極
18 挿入膜
20 共振領域
20a 中央領域
20b 外周領域
22 空隙
24 周波数調整膜
26 質量負荷膜
28 導入路
30 孔部
32 犠牲層
40 音響反射膜
42 音響インピーダンスの低い膜
44 音響インピーダンスの高い膜
50 送信フィルタ
52 受信フィルタ
Claims (14)
- 基板と、
前記基板上に設けられ、ポアソン比が0.33以下の圧電膜と、
前記圧電膜を挟んで対向した下部電極及び上部電極と、
前記圧電膜を挟み前記下部電極と前記上部電極とが対向する共振領域内の外周領域の前記圧電膜内若しくは前記圧電膜の下面又は上面に設けられ、前記共振領域の中央領域には設けられていない挿入膜と、を備え、
前記共振領域内の外周領域の前記下部電極、前記圧電膜、及び前記上部電極の少なくとも1つは、対応する前記共振領域の中央領域の前記下部電極、前記圧電膜、及び前記上部電極の前記少なくとも1つに比べて薄く、
前記共振領域内の外周領域の遮断周波数と前記共振領域の中央領域の遮断周波数とは、ほぼ同じであることを特徴とする圧電薄膜共振器。 - 基板と、
前記基板上に設けられ、ポアソン比が0.33以下の圧電膜と、
前記圧電膜を挟んで対向した下部電極及び上部電極と、
前記圧電膜を挟み前記下部電極と前記上部電極とが対向する共振領域内の外周領域の前記圧電膜内若しくは前記圧電膜の下面又は上面に設けられ、前記共振領域の中央領域には設けられていない挿入膜と、を備え、
前記共振領域内の外周領域の前記下部電極、前記圧電膜、及び前記上部電極の少なくとも1つは、対応する前記共振領域の中央領域の前記下部電極、前記圧電膜、及び前記上部電極の前記少なくとも1つに比べて薄く、
前記共振領域内の外周領域における遮断周波数と厚み縦振動モードの分散曲線の極小周波数との差は、前記共振領域の中央領域における遮断周波数と厚み縦振動モードの分散曲線の極小周波数との差よりも小さいことを特徴とする圧電薄膜共振器。 - 前記共振領域内の外周領域における前記下部電極、前記圧電膜、及び前記上部電極を含む積層膜は、前記共振領域の中央領域における前記下部電極、前記圧電膜、及び前記上部電極を含む積層膜に比べて薄いことを特徴とする請求項1または2記載の圧電薄膜共振器。
- 前記共振領域内の外周領域の前記下部電極及び前記上部電極の少なくとも一方は、前記共振領域の中央領域の前記下部電極及び前記上部電極の前記少なくとも一方に比べて、金属層の層数が少ないことを特徴とする請求項1から3のいずれか一項記載の圧電薄膜共振器。
- 基板と、
前記基板上に設けられ、ポアソン比が0.33以下の圧電膜と、
前記圧電膜を挟んで対向した下部電極及び上部電極と、
前記圧電膜を挟み前記下部電極と前記上部電極とが対向する共振領域内の外周領域の前記圧電膜内若しくは前記圧電膜の下面又は上面に設けられ、前記共振領域の中央領域には設けられていない挿入膜と、を備え、
前記共振領域内の外周領域の遮断周波数と前記共振領域の中央領域の遮断周波数とは、ほぼ同じであり、
前記共振領域内の外周領域における遮断周波数と厚み縦振動モードの分散曲線の極小周波数との差は、前記共振領域の中央領域における遮断周波数と厚み縦振動モードの分散曲線の極小周波数との差よりも小さいことを特徴とする圧電薄膜共振器。 - 基板と、
前記基板上に設けられ、窒化アルミニウム膜又は他の元素を含む窒化アルミニウム膜である圧電膜と、
前記圧電膜を挟んで対向した下部電極及び上部電極と、
前記圧電膜を挟み前記下部電極と前記上部電極とが対向する共振領域内に位置し前記共振領域の外周を含み、前記外周に沿った領域である外周領域の前記圧電膜内若しくは前記圧電膜の下面又は上面に設けられ、前記共振領域内の領域であって、前記外周領域よりも内側部分であり、前記共振領域の中央を含む領域である中央領域には設けられてなく、前記圧電膜よりも音響インピーダンス及びポアソン比が小さい挿入膜と、を備え、
前記共振領域内の外周領域の前記下部電極、前記圧電膜、及び前記上部電極の少なくとも1つは、対応する前記共振領域の中央領域の前記下部電極、前記圧電膜、及び前記上部電極の前記少なくとも1つに比べて薄く、
前記共振領域内の外周領域の前記下部電極、前記圧電膜、前記挿入膜、及び前記上部電極を含む積層膜の厚さは、前記中央領域における前記下部電極、前記圧電膜、及び前記上部電極を含む積層膜の厚さよりも薄いことを特徴とする圧電薄膜共振器。 - 前記共振領域内に前記挿入膜が設けられる領域において、前記共振領域内の外周領域の前記下部電極、前記圧電膜、及び前記上部電極の少なくとも1つは、対応する前記共振領域の中央領域の前記下部電極、前記圧電膜、及び前記上部電極の前記少なくとも1つに比べて薄いことを特徴とする請求項6記載の圧電薄膜共振器。
- 前記挿入膜は、前記圧電膜よりも音響インピーダンスが小さいことを特徴とする請求項1から5のいずれか一項記載の圧電薄膜共振器。
- 前記挿入膜は、前記圧電膜よりもポアソン比が小さいことを特徴とする請求項8記載の圧電薄膜共振器。
- 前記挿入膜は、酸化シリコン膜又は他の元素を含む酸化シリコン膜であることを特徴とする請求項1から9のいずれか一項記載の圧電薄膜共振器。
- 前記圧電膜は、窒化アルミニウム膜又は他の元素を含む窒化アルミニウム膜であることを特徴とする請求項1から5のいずれか一項記載の圧電薄膜共振器。
- 前記共振領域において、前記基板と前記下部電極との間に空隙が形成されていることを特徴とする請求項1から11のいずれか一項記載の圧電薄膜共振器。
- 前記共振領域において、前記下部電極下に前記圧電膜を伝搬する弾性波を反射する音響反射膜を備えることを特徴とする請求項1から11のいずれか一項記載の圧電薄膜共振器。
- 請求項1から13のいずれか一項記載の圧電薄膜共振器を含むことを特徴とするフィルタ。
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US15/214,786 US10177732B2 (en) | 2015-07-29 | 2016-07-20 | Piezoelectric thin film resonator, filter, and duplexer |
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JP6441761B2 (ja) | 2015-07-29 | 2018-12-19 | 太陽誘電株式会社 | 圧電薄膜共振器及びフィルタ |
JP6469601B2 (ja) * | 2016-02-05 | 2019-02-13 | 太陽誘電株式会社 | 圧電薄膜共振器、フィルタおよびデュプレクサ |
US11228299B2 (en) * | 2017-02-02 | 2022-01-18 | Taiyo Yuden Co., Ltd. | Piezoelectric thin film resonator with insertion film, filter, and multiplexer |
JP7017364B2 (ja) | 2017-10-18 | 2022-02-08 | 太陽誘電株式会社 | ラダー型フィルタ、圧電薄膜共振器およびその製造方法 |
JP7447372B2 (ja) * | 2018-05-17 | 2024-03-12 | サムソン エレクトロ-メカニックス カンパニーリミテッド. | バルク音響共振器及びその製造方法 |
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