JP2005512442A - 反射性の改善された音響鏡 - Google Patents
反射性の改善された音響鏡 Download PDFInfo
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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
- 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
- H03H9/02149—Means for compensation or elimination of undesirable effects of ageing changes of characteristics, e.g. electro-acousto-migration
-
- 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]
-
- 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
- H03H9/586—Means for mounting to a substrate, i.e. means constituting the material interface confining the waves to a volume
- H03H9/589—Acoustic mirrors
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- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
Abstract
Description
fr=v/2L0
にしたがって得られる。ここでvは圧電性のベースボディの縦波の速度である。この種の共振器は例えばHFフィルタの製造に用いられる。このために多数の共振器がフィルタ回路網、いわゆるリアクタンスフィルタの分岐回路として接続される。
R=|(Z1−Z2)/(Z1+Z2)|2
にしたがって求められる。ここでZ1はAuの音響インピーダンス(ZAu=63*106kg/sm2)に相応し、Z2はlow−k誘電体(実験ではSiLK(R)およびBCB)の音響インピーダンス(Zlow−k=<2*106kg/sm2)またはSiO2の音響インピーダンス(ZSiO2=14*106kg/sm2)に相応する。
密度 2.2g/cm3 <2.0g/cm3
弾性定数 7.8×1010Pa <0.27×1010pa
相対誘電定数 4 2.65
音響インピーダンス 13×106kg/sm2 <2.3×106kg/sm2
図4には複数のBAW共振器から成るリアクタンスフィルタの3つの例が示されている。図4のA,Bのラダータイプ構造のものでは少なくとも1つの共振器Rsがフィルタ入力側とフィルタ出力側とのあいだに直列に接続されており、これに並列に少なくとも1つの別の共振器Rpがアースへ接続されている。直列分岐に配置された共振器Rsの共振周波数はここではフィルタの並列分岐の共振器Rpの反共振周波数にほぼ相応するように選定されており、つまりfap=frsとなっている。
Claims (18)
- λ/4層または3λ/4層から成る少なくとも1つの層対を有しており、各層対の第1の層(LK)は低い音響インピーダンスを有する材料から成り、第2の層(HZ)は第1の層よりも高い音響インピーダンスを有する材料から成る、
BAW共振器用またはスタックドクリスタルフィルタ用の音響鏡において、
低い音響インピーダンスを有する第1の層(LK)の材料としてlow−k誘電体が選択される
ことを特徴とする音響鏡。 - BAW共振器またはスタックドクリスタルフィルタの最上層に配置されており、低い音響インピーダンスを有する第1の層(LK)と、第1の層よりも高い音響インピーダンスを有しかつ第1の層の上方に堆積された第2の層(HZ)とから成る、請求項1記載の音響鏡。
- 相対的に高い音響インピーダンスを有する第2の層(HZ)の材料はタングステンW、モリブデンMoまたはアルミニウム窒化物から選択される、請求項1記載の音響鏡。
- low−k誘電体(LK)の密度は2.4g/cm3よりも小さく、弾性定数の値は10GPaより小さく、相対誘電定数は3より小さい、請求項1から3までのいずれか1項記載の音響鏡。
- low−k誘電体(LK)として、エーロゲル、多孔性のシリケート、有機シリケート、縮合したシルセスキオキサンから誘導されたシロキサン、ポリ芳香族化合物、架橋したポリフェニレンまたは重合したベンゾシクロブテンから選択される、請求項1から4までのいずれか1項記載の音響鏡。
- low−k誘電体(LK)としてポリ芳香族化合物が選択され、該ポリ芳香族化合物は置換されていないかまたは極性の無い基を有しておりかつ芳香族化されたポリアリーレンから誘導される、請求項5記載の音響鏡。
- low−k誘電体(LK)として、ベンゾシクロブテンから誘導された音響インピーダンスの低い誘電体が使用される、請求項1から4までのいずれか1項記載の音響鏡。
- low−k誘電体(LK)として、置換されたポリフェニレンから誘導された音響インピーダンスの低い誘電体が使用される、請求項1から4までのいずれか1項記載の音響鏡。
- low−k誘電体(LK)にナノホールが設けられている、請求項1から8までのいずれか1項記載の音響鏡。
- λ/4層の唯一の層対から形成され、low−k誘電体は芳香族化されたポリフェニレンから誘導されたポリ芳香族化合物であるかまたは重合したベンゾシクロブテンであり、高い音響インピーダンスを有する第2の層の材料はタングステン、モリブデンまたはアルミニウム窒化物、ガリウム窒化物または亜鉛酸化物から選択される、請求項1から9までのいずれか1項記載の音響鏡。
- 支持体として機能する基板(S)の上方に相対的に高い音響インピーダンスを有する層(HZ)が配置され、その上方に低い音響インピーダンスを有する層(LK)が配置されてこれらの層が音響鏡(A)を成し、
該音響鏡の上方に第1の電極(E1)、圧電層(P)および第2の電極(E2)が配置され、
ここで電極材料はAl、W、Mo、CuまたはAuから選択され、圧電材料は亜鉛酸化物、アルミニウム窒化物、ガリウム窒化物またはその他の圧電材料に適した化合物から選択される
ことを特徴とするBAW共振器。 - 支持体として機能する基板(S)の上方に相対的に高い音響インピーダンスを有する層(HZ)が配置され、その上方に低い音響インピーダンスを有する層(LK)が配置されてこれらの層が音響鏡(A)を成し、
該音響鏡の上方に第1の電極(E1)、第1の圧電層(P1)、第2の電極(E2)、、第2の圧電層(P2)および第3の電極(E3)が配置され、
ここで第1の電極および第2の電極用の電極材料はAl、W、CuまたはAuから選択され、圧電材料は亜鉛酸化物、アルミニウム窒化物、ガリウム窒化物またはその他の圧電材料に適した化合物から選択される
ことを特徴とするスタックドクリスタルフィルタ。 - 第2の電極(E2)は2つの部分電極に分割されており、各部分電極のあいだにlow−k誘電体から成る少なくとも1つのλ/4層の音響鏡が配置される、請求項12記載のスタックドクリスタルフィルタ。
- 直列部と並列部とからなる分岐回路として接続されてリアクタンスフィルタを成す、請求項11から13までのいずれか1項記載のBAW共振器またはスタックドクリスタルフィルタ。
- ラティス構造で接続されてリアクタンスフィルタを成す、請求項14記載のBAW共振器またはスタックドクリスタルフィルタ。
- 請求項11記載のBAW共振器として構成された第1のリアクタンスフィルタおよび第2のリアクタンスフィルタを有することを特徴とするデュプレクサ。
- 2つのリアクタンスフィルタの全てのBAW共振器が共通の音響鏡(A)の上方に配置されている、請求項16記載のデュプレクサ。
- 共通の音響鏡(A)はBAW共振器の下方の基板(S)上の全面にわたってパターニングなしで配置されている、請求項17記載のデュプレクサ。
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10160617A DE10160617A1 (de) | 2001-12-11 | 2001-12-11 | Akustischer Spiegel mit verbesserter Reflexion |
PCT/DE2002/004498 WO2003050950A1 (de) | 2001-12-11 | 2002-12-06 | Akustischer spiegel mit verbesserter reflexion |
Publications (2)
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JP2005512442A true JP2005512442A (ja) | 2005-04-28 |
JP2005512442A5 JP2005512442A5 (ja) | 2005-12-22 |
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JP2003551898A Pending JP2005512442A (ja) | 2001-12-11 | 2002-12-06 | 反射性の改善された音響鏡 |
Country Status (5)
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US (1) | US7230509B2 (ja) |
JP (1) | JP2005512442A (ja) |
CN (1) | CN100517965C (ja) |
DE (1) | DE10160617A1 (ja) |
WO (1) | WO2003050950A1 (ja) |
Cited By (6)
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JP2005136991A (ja) * | 2003-10-30 | 2005-05-26 | Agilent Technol Inc | 逆方向のc軸圧電材料を備えた音響結合変成器 |
JP2007510383A (ja) * | 2003-10-30 | 2007-04-19 | アバゴ・テクノロジーズ・ジェネラル・アイピー(シンガポール)プライベート・リミテッド | 制御可能な通過帯域幅を有する減結合スタック型バルク音響共振器の帯域フィルタ |
JP2007510382A (ja) * | 2003-10-30 | 2007-04-19 | アバゴ・テクノロジーズ・ジェネラル・アイピー(シンガポール)プライベート・リミテッド | パッケージを単純化した圧電薄膜共振器(fbar)デバイス |
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- 2002-12-06 WO PCT/DE2002/004498 patent/WO2003050950A1/de active Application Filing
- 2002-12-06 CN CNB02824737XA patent/CN100517965C/zh not_active Expired - Fee Related
- 2002-12-06 JP JP2003551898A patent/JP2005512442A/ja active Pending
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JP2005136991A (ja) * | 2003-10-30 | 2005-05-26 | Agilent Technol Inc | 逆方向のc軸圧電材料を備えた音響結合変成器 |
JP2007510383A (ja) * | 2003-10-30 | 2007-04-19 | アバゴ・テクノロジーズ・ジェネラル・アイピー(シンガポール)プライベート・リミテッド | 制御可能な通過帯域幅を有する減結合スタック型バルク音響共振器の帯域フィルタ |
JP2007510382A (ja) * | 2003-10-30 | 2007-04-19 | アバゴ・テクノロジーズ・ジェネラル・アイピー(シンガポール)プライベート・リミテッド | パッケージを単純化した圧電薄膜共振器(fbar)デバイス |
JP2007511134A (ja) * | 2003-10-30 | 2007-04-26 | アバゴ・テクノロジーズ・ジェネラル・アイピー(シンガポール)プライベート・リミテッド | 減結合スタック型バルク音響共振器デバイスにおける通過帯域幅の制御 |
JP4782016B2 (ja) * | 2003-10-30 | 2011-09-28 | アバゴ・テクノロジーズ・ジェネラル・アイピー(シンガポール)プライベート・リミテッド | 減結合スタック型バルク音響共振器デバイスにおける通過帯域幅の制御 |
JP2008172711A (ja) * | 2007-01-15 | 2008-07-24 | Hitachi Media Electoronics Co Ltd | 薄膜バルク弾性波共振器およびフィルタおよびそれを用いた高周波モジュール |
JP2011142613A (ja) * | 2009-12-08 | 2011-07-21 | Murata Mfg Co Ltd | 積層型圧電薄膜フィルタの製造方法 |
JP2017509246A (ja) * | 2014-03-11 | 2017-03-30 | エプコス アクチエンゲゼルシャフトEpcos Ag | 温度補償部を備えたbaw共振器 |
Also Published As
Publication number | Publication date |
---|---|
WO2003050950A1 (de) | 2003-06-19 |
US20050068124A1 (en) | 2005-03-31 |
US7230509B2 (en) | 2007-06-12 |
CN100517965C (zh) | 2009-07-22 |
CN1602586A (zh) | 2005-03-30 |
DE10160617A1 (de) | 2003-06-12 |
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