JP3987036B2 - フィルタ装置およびその製造方法 - Google Patents
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- JP3987036B2 JP3987036B2 JP2003543190A JP2003543190A JP3987036B2 JP 3987036 B2 JP3987036 B2 JP 3987036B2 JP 2003543190 A JP2003543190 A JP 2003543190A JP 2003543190 A JP2003543190 A JP 2003543190A JP 3987036 B2 JP3987036 B2 JP 3987036B2
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Images
Classifications
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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
- H03H9/175—Acoustic mirrors
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H3/00—Apparatus or processes specially adapted for the manufacture of impedance networks, resonating circuits, resonators
- H03H3/007—Apparatus or processes specially adapted for the manufacture of impedance networks, resonating circuits, resonators for the manufacture of electromechanical resonators or networks
- 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
-
- 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
- H03H9/02047—Treatment of substrates
- H03H9/02055—Treatment of substrates of the surface including the back surface
-
- 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
- H03H9/0211—Means for compensation or elimination of undesirable effects of reflections
-
- 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 piezo-electric 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]
-
- 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 piezo-electric or electrostrictive material
- H03H9/58—Multiple crystal filters
- H03H9/582—Multiple crystal filters implemented with thin-film techniques
- H03H9/586—Means for mounting to a substrate, i.e. means constituting the material interface confining the waves to a volume
- H03H9/589—Acoustic mirrors
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/42—Piezoelectric device making
Description
(a)上面および下面を有する基板
(b)基板の上面に接触する少なくとも1つの弾性波フィルタ
このとき、基板の下面は、弾性波の弾性波フィルタへの反射を低減させるために、粗くなっている。
Claims (16)
- (a)上面(12)および下面(14)を有する基板(10)と、
(b)共振周波数が0.5〜5GHzである少なくとも1つの弾性バルク波共振器を含んだ、少なくとも1つの弾性バルク波(BAW)フィルタ(20)とを含み、
上記弾性バルク波(BAW)フィルタ(20)は、基板(10)の上面(12)に接触しており、
上記基板(10)の下面(14)が、弾性波の弾性波フィルタ(20)への反射を低減させるためにでこぼこになっている、フィルタ装置。 - でこぼこにした基板の下面における突出部と窪みとの平均高度差が、0.2λよりも大きく、好ましくは0.5λよりも大きい、請求項1に記載のフィルタ装置。
- 上記でこぼこにした基板の下面における突出部と窪みとの平均横方向距離が、3λよりも小さく、好ましくは2λよりも小さい、請求項1または2に記載のフィルタ装置。
- 上記弾性波フィルタが、少なくとも1つの積層型結晶フィルタ(SCF)を含んだ弾性バルク波(BAW)フィルタである、請求項1〜3のいずれか1項に記載のフィルタ装置。
- 上記弾性波フィルタは、少なくとも1つの音響ミラーをさらに含んでいる、請求項1〜4のいずれか1項に記載のフィルタ装置。
- 上記音響ミラーは、弾性バルク波共振器または積層型結晶フィルタと、基板の上面(12)との間に配置されている、請求項5に記載のフィルタ装置。
- 上記音響ミラーは、ミラー層を2組のみ含んでおり、この各組のミラー層が、高い音響インピーダンスを有する材料からなる層と、低い音響インピーダンスを有する材料からなる層とを含んでおり、双方の組のミラー層は、高い音響インピーダンスを有する材料からなる2つの層が、低い音響インピーダンスを有する材料からなる1つの層によって隔てられて配置されている、請求項5または6に記載のフィルタ装置。
- 上記基板がシリコン基板である、請求項1〜7のいずれか1項に記載のフィルタ装置。
- フィルタ装置の製造方法であって、
(a)上記上面(12)および下面(14)を有する基板(10)を準備するステップと、
(b)上記基板(10)の上面(12)に、共振周波数が0.5〜5GHzの弾性バルク波共振器を少なくとも1つ含む弾性バルク波フィルタ(20)を少なくとも1つ形成するステップと、
(c)上記弾性バルク波フィルタ(20)への弾性波の反射が低減するように、基板(10)の下面(14)をでこぼこにするステップとを含んだ、製造方法。 - 上記した基板(10)の下面(14)をでこぼこにするステップ(c)を、基板を薄くすると同時に実施する、請求項9に記載の方法。
- 上記の下面(14)をでこぼこにするステップは、機械を用いて実施される、請求項9または10に記載の方法。
- 上記の下面をでこぼこにするステップは、研磨によって実施される、請求項9〜11のいずれか1項に記載の方法。
- 上記の下面(14)をでこぼこにするステップは、エッチング、好ましくはウェットエッチングによって実施される、請求項9または10に記載の方法。
- 上記弾性波フィルタは、少なくとも1つの積層型結晶フィルタ(SCF)を含んだ弾性バルク波(BAW)フィルタである、請求項9〜13のいずれか1項に記載の方法。
- 上記ステップ(b)では、基板(10)の上面(12)と、弾性波フィルタにおける弾性バルク波共振器または積層型結晶フィルタ(SCF)との間に配置される音響ミラーを形成する、請求項9〜14のいずれか1項に記載の方法。
- 上記基板(10)がシリコン基板である、請求項9〜15のいずれか1項に記載の方法。
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/EP2001/012826 WO2003041273A1 (en) | 2001-11-06 | 2001-11-06 | Filter device and method of fabricating a filter device |
Publications (3)
Publication Number | Publication Date |
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JP2005509348A JP2005509348A (ja) | 2005-04-07 |
JP2005509348A5 JP2005509348A5 (ja) | 2007-04-05 |
JP3987036B2 true JP3987036B2 (ja) | 2007-10-03 |
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JP2003543190A Expired - Fee Related JP3987036B2 (ja) | 2001-11-06 | 2001-11-06 | フィルタ装置およびその製造方法 |
Country Status (5)
Country | Link |
---|---|
US (1) | US6943647B2 (ja) |
EP (1) | EP1454412B1 (ja) |
JP (1) | JP3987036B2 (ja) |
DE (1) | DE60140319D1 (ja) |
WO (1) | WO2003041273A1 (ja) |
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2001
- 2001-11-06 JP JP2003543190A patent/JP3987036B2/ja not_active Expired - Fee Related
- 2001-11-06 DE DE60140319T patent/DE60140319D1/de not_active Expired - Lifetime
- 2001-11-06 EP EP01274644A patent/EP1454412B1/en not_active Expired - Lifetime
- 2001-11-06 WO PCT/EP2001/012826 patent/WO2003041273A1/en active Application Filing
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11146237B2 (en) | 2019-01-16 | 2021-10-12 | Murata Manufacturing Co., Ltd. | Acoustic wave device |
Also Published As
Publication number | Publication date |
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JP2005509348A (ja) | 2005-04-07 |
DE60140319D1 (de) | 2009-12-10 |
EP1454412B1 (en) | 2009-10-28 |
WO2003041273A1 (en) | 2003-05-15 |
US6943647B2 (en) | 2005-09-13 |
US20040227591A1 (en) | 2004-11-18 |
EP1454412A1 (en) | 2004-09-08 |
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