JP2013005446A - 非圧電層を備えたバルク音響共振器 - Google Patents
非圧電層を備えたバルク音響共振器 Download PDFInfo
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- 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
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/46—Filters
- H03H9/54—Filters comprising resonators of piezoelectric or electrostrictive material
- H03H9/58—Multiple crystal filters
- H03H9/582—Multiple crystal filters implemented with thin-film techniques
- H03H9/583—Multiple crystal filters implemented with thin-film techniques comprising a plurality of piezoelectric layers acoustically coupled
- H03H9/585—Stacked Crystal Filters [SCF]
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Abstract
【解決手段】第1の電極105は、基板103上及びキャビティ104上に懸架される。圧電層107は、第1の電極105上に配設され、窒化アルミニウム(AlN)又は酸化亜鉛(ZnO)等の非常にきめの細かいc軸圧電材料からなる。非圧電層108は典型的には、圧電層107と同じ物質から作成されるが、非晶質又は多結晶であり、圧電効果を殆ど呈さず又は全く呈さない。第2の電極101は、圧電層107上、及非圧電層108上に配設される。キャビティ104、第1の電極105、圧電層107、及び第2の電極101の重複は、共振器のアクティブ領域109を画定するものとなる。
【選択図】図1B
Description
・FBARからなる実施形態
図1Aは、例示的な一実施形態によるFBAR100の平面図である。該FBAR100は、上部電極101(以下では第2の電極101とも称す)を備えており、該上部電極101は、例示のため5つの側部を有しており、相互接続部102'に対する電気的接続を提供するよう構成された接続用側部102を有している。該相互接続部102'は、上部電極101へ電気信号を提供し、該FBAR100の圧電層(図1には図示せず)内で所望の音響波を励起させる。
・二重バルク音響共振器(DBAR)からなる実施形態
図2A−2Cは例示的な実施形態による二重バルク音響共振器(DBAR)の断面図である。本実施形態の多数の細部は、図1A−1Cの例示的な実施形態に関して上述したものと共通である。一般に、DBARを構成する実施形態の説明において共通の細部については繰り返し説明しないこととする。
・結合共振器フィルタ(CRF)からなる実施形態
図3A−3Cは例示的な実施形態による結合共振器フィルタ(CRF)の断面図である。本実施形態の多数の細部は、図1A−2Cの例示的な実施形態に関して上述したものと共通である。一般に、CRFを構成する実施形態の説明において共通の細部については繰り返し説明しないこととする。
Claims (19)
- バルク音響波(BAW)共振器構造であって、
基板上に配設された第1の電極と、
該第1の電極上に配設された圧電層と、
該圧電層上に配設された第2の電極であって、該圧電層の結晶のc軸配向が実質的に互いに整列している、第2の電極と、
該圧電層に隣接して前記第1の電極上に配設された非圧電層と
を備えており、
前記第2の電極との前記非圧電層の重複が、実質的に、該非圧電層における第1の伝搬固有モードの1/4波長の整数倍に等しい幅、又は該非圧電層における第1の一過性固有モードの減衰定数の逆数(1/k)以上の幅を有している、
BAW共振器構造。 - 前記非圧電層が多結晶である、請求項1に記載のBAW共振器構造。
- 前記圧電層が特定の材料からなり、前記非圧電層が非結晶形態の該材料からなる、請求項1に記載のBAW共振器構造。
- 前記材料が窒化アルミニウムである、請求項3に記載のBAW共振器構造。
- 前記第1の電極の下方に配設された音響反射器を更に含む、請求項1に記載のBAW共振器構造。
- 前記音響反射器がキャビティからなる、請求項5に記載のBAW共振器構造。
- 前記圧電層が第1の圧電結合係数(e33)を有し、前記非圧電層が該第1の圧電結合係数の80%以下の圧電結合係数を有する、請求項1に記載のBAW共振器構造。
- バルク音響波(BAW)共振器構造であって、
基板上に配設された第1の電極と、
該第1の電極上に配設された第1の圧電層と、
該第1の圧電層上に配設された第2の電極であって、該第1の圧電層の結晶のc軸配向が実質的に互いに整列している、第2の電極と、
該第2の電極上に配設された第2の圧電層と、
非圧電層と、
前記第2の圧電層上に配設された第3の電極と
を備えている、BAW共振器構造。 - 前記非圧電層が、実質的に、該非圧電層における第1の伝搬固有モードの1/4波長の整数倍に実質的に等しい幅、又は該非圧電層における第1の一過性固有モードの減衰定数の逆数(1/k)以上の幅を有している、請求項8に記載のBAW共振器構造。
- 前記非圧電層が、前記第1の圧電層に隣接して前記第1の電極上に配設されている、請求項8に記載のBAW共振器構造。
- 前記非圧電層が、前記第2の圧電層に隣接して前記第2の電極上に配設されている、請求項8に記載のBAW共振器構造。
- 前記第2の圧電層に隣接して前記第2の電極上に配設された第2の非圧電層を更に備えている、請求項10に記載のBAW共振器構造。
- 前記非圧電層が多結晶である、請求項8に記載のBAW共振器構造。
- 前記第1の圧電層が特定の材料からなり、前記非圧電層が非結晶形態の該材料からなる、請求項8に記載のBAW共振器構造。
- 前記材料が窒化アルミニウムである、請求項14に記載のBAW共振器構造。
- 前記第1の圧電層が第1の圧電結合係数(e33)を有し、前記非圧電層が該第1の圧電結合係数の80%以下の圧電結合係数を有する、請求項8に記載のBAW共振器構造。
- 前記第2の圧電層が特定の材料からなり、前記第2の非圧電層が非結晶形態の該材料からなる、請求項12に記載のBAW共振器構造。
- 前記第2の圧電層が第2の圧電結合係数(e33)を有し、前記第2の非圧電層が該第2の圧電結合係数の80%以下の圧電結合係数を有する、請求項12に記載のBAW共振器構造。
- 前記第2の電極と前記第2の圧電層との間に配設された音響結合層と、該音響結合層の上方かつ前記第2の圧電層の下方に配設された第4の電極とを更に備えている、請求項8に記載のBAW共振器構造。
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US13/161,946 | 2011-06-16 | ||
US13/161,946 US8330325B1 (en) | 2011-06-16 | 2011-06-16 | Bulk acoustic resonator comprising non-piezoelectric layer |
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US20120319530A1 (en) | 2012-12-20 |
US8330325B1 (en) | 2012-12-11 |
DE102012210160B4 (de) | 2023-12-07 |
DE102012210160A1 (de) | 2012-12-20 |
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