JP6784331B2 - 弾性波装置、高周波フロントエンド回路および通信装置 - Google Patents
弾性波装置、高周波フロントエンド回路および通信装置 Download PDFInfo
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- 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
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- H03H3/02—Apparatus or processes specially adapted for the manufacture of impedance networks, resonating circuits, resonators for the manufacture of electromechanical resonators or networks for the manufacture of piezoelectric or electrostrictive resonators or networks
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Description
[1−1.弾性波装置の構成]
図1Aは、実施の形態1に係る弾性波装置1の平面図である。また、図1Bは、実施の形態1に係る弾性波装置1の回路構成の一例である。また、図2は、実施の形態1に係る弾性波装置1の断面図である。より具体的には、図2は、図1Aの弾性波装置1をII−II線で切断した場合の切断面である。
次に、本実施の形態に係る弾性波装置1の製造方法について説明する。
図4は、実施の形態1の変形例1に係る弾性波装置1Aの断面図である。本変形例に係る弾性波装置1Aは、実施の形態1に係る弾性波装置1と比較して、音響反射層57の積層構造が異なる。なお、弾性波装置1Aの平面図および回路構成については、図1Aに記載された平面図および図1Bに記載された回路構成と同様である。以下、本変形例に係る弾性波装置1Aについて、実施の形態1に係る弾性波装置1と同じ点については説明を省略し、異なる点を中心に説明する。
図6は、実施の形態2に係る高周波フロントエンド回路3および通信装置6を示す回路構成図である。本実施の形態に係る高周波フロントエンド回路3および通信装置6では、第1フィルタ1Cおよび第2フィルタ1Dに、実施の形態1に係る弾性波装置1、1Aおよび1Bのいずれかが適用される。
以上、実施の形態1に係る弾性波装置1、1Aおよび1B、ならびに、実施の形態2に係る高周波フロントエンド回路3および通信装置6について、実施の形態および変形例に基づいて説明したが、本発明は、上記実施の形態および変形例に限定されるものではない。上記実施の形態および変形例における任意の構成要素を組み合わせて実現される別の実施の形態や、上記実施の形態に対して本発明の主旨を逸脱しない範囲で当業者が思いつく各種変形を施して得られる変形例や、本発明に係る弾性波装置、高周波フロントエンド回路および通信装置を内蔵した各種機器も本発明に含まれる。
1C 第1フィルタ
1D 第2フィルタ
2 アンテナ素子
3 高周波フロントエンド回路
4 RFIC
5 BBIC
6 通信装置
11、12 直列腕共振子
21、22 並列腕共振子
31、32 入出力端子
32C 第1端子
32D 第2端子
33、34 グランド端子
35 アンテナ共通端子
41、41a、41b、42、42a、42b、42c、43、44、45、46、47 配線電極
50、50A、50B 基板
51 支持基板
52 圧電層
52p 圧電基板
53A、53B、53C、53D、53E 低Z誘電体層
53p 低Z誘電体膜
54、54A、54B 金属層
55、55A、55B 高Z誘電体層
56、57、58 音響反射層
60C、60D LNA
105 マルチポートスイッチ
110、120、210、220 IDT電極
Claims (11)
- 支持基板と、
前記支持基板上に直接または間接的に積層された音響反射層と、
前記音響反射層上に直接または間接的に積層された圧電層と、
前記圧電層上に直接または間接的に形成された、1以上のIDT電極と、
前記圧電層上に直接または間接的に形成され、前記1以上のIDT電極と電気的に接続された配線電極と、を備え、
前記音響反射層は、
第1誘電体層と、
前記第1誘電体層よりも前記支持基板側に配置され、前記第1誘電体層よりも音響インピーダンスが高い第2誘電体層と、
前記第1誘電体層よりも前記圧電層側に配置され、前記第1誘電体層よりも音響インピーダンスが高い金属層と、を有し、
前記金属層は、前記音響反射層を平面視した場合に、前記1以上のIDT電極のうちの一のIDT電極と当該一のIDT電極に接続された配線電極とを含み、かつ、当該一のIDT電極以外のIDT電極を含まない領域において、前記金属層の形成面積は前記第2誘電体層の形成面積よりも小さい、
弾性波装置。 - 前記1以上のIDT電極のそれぞれは、一対の櫛歯状電極からなり、
前記圧電層の膜厚は、前記一対の櫛歯状電極のうちの一方の櫛歯状電極を構成する複数の電極指の繰り返しピッチであるIDT波長以下である、
請求項1に記載の弾性波装置。 - 前記音響反射層は、さらに、
前記金属層と前記圧電層との間に配置され、前記金属層よりも音響インピーダンスが低い第3誘電体層を有する、
請求項1または2に記載の弾性波装置。 - 前記第3誘電体層の膜厚と前記第1誘電体層の膜厚とは異なる、
請求項3に記載の弾性波装置。 - 前記音響反射層は、
前記圧電層の垂線方向に積層された複数の前記金属層、および、前記垂線方向に積層された複数の前記第2誘電体層の少なくとも一方を有し、
前記複数の金属層の間には、それぞれ、前記金属層よりも音響インピーダンスが低い第4誘電体層が配置され、
前記複数の第2誘電体層の間には、それぞれ、前記第2誘電体層よりも音響インピーダンスが低い第5誘電体層が配置されている、
請求項1〜4のいずれか1項に記載の弾性波装置。 - 前記第4誘電体層の膜厚と前記第5誘電体層の膜厚とは異なる、
請求項5に記載の弾性波装置。 - 前記金属層は、PtまたはWからなる、
請求項1〜6のいずれか1項に記載の弾性波装置。 - 前記第1誘電体層は、シリコン酸化物からなる、
請求項1〜7のいずれか1項に記載の弾性波装置。 - 前記第2誘電体層は、Ta2O5からなる、
請求項1〜8のいずれか1項に記載の弾性波装置。 - 請求項1〜9のいずれか1項に記載の弾性波装置と、
前記弾性波装置に接続された増幅回路と、を備える、
高周波フロントエンド回路。 - 請求項10に記載の高周波フロントエンド回路と、
高周波信号を処理する信号処理回路と、を備える、
通信装置。
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Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
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JP2017123608 | 2017-06-23 | ||
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