JP2005137002A - 通過帯域幅の制御が可能なスタック形バルク音響共鳴器用帯域フィルタ - Google Patents
通過帯域幅の制御が可能なスタック形バルク音響共鳴器用帯域フィルタ Download PDFInfo
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- JP2005137002A JP2005137002A JP2004314021A JP2004314021A JP2005137002A JP 2005137002 A JP2005137002 A JP 2005137002A JP 2004314021 A JP2004314021 A JP 2004314021A JP 2004314021 A JP2004314021 A JP 2004314021A JP 2005137002 A JP2005137002 A JP 2005137002A
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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 elements; 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
- H03H9/587—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 elements; 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
- H03H9/132—Driving means, e.g. electrodes, coils for networks consisting of piezoelectric or electrostrictive materials characterized by a particular shape
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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 elements; 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
- H03H9/584—Coupled Resonator Filters [CFR]
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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 elements; Electromechanical resonators
- H03H9/46—Filters
- H03H9/54—Filters comprising resonators of piezoelectric or electrostrictive material
- H03H9/58—Multiple crystal filters
- H03H9/60—Electric coupling means therefor
- H03H9/605—Electric coupling means therefor consisting of a ladder configuration
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- 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
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- 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
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/49005—Acoustic transducer
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- 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
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/49117—Conductor or circuit manufacturing
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- Acoustics & Sound (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
Abstract
【解決手段】 スタック状の対をなす膜状バルク音響共鳴器(FBAR)とFBAR間の音響デカップラを備えた帯域フィルタが得られる。FBARには、それぞれ、向かい合った平面電極と、電極間の圧電材料層が含まれている。音響デカップラは、FBAR間の音響エネルギの結合を制御する。すなわち、音響デカップラによって結合されるFBAR間の音響エネルギは、典型的なSBARにおけるような、FBAR間の直接接触によって結合される音響エネルギよりも少なくなる。音響結合が低減すると、低挿入損失で、その通過帯域における周波数応答がフラットであり、通過帯域幅が、中心周波数の約3%〜約5%の範囲内にあり、帯域外除去に優れるといった望ましい特性が、帯域フィルタに与えられる。
【選択図】図5B
Description
106 圧電材料層
110 第1の膜状バルク音響共鳴器
112、114 平面電極
120 第2の膜状バルク音響共鳴器
130 音響デカップラ
131 音響デカップリング材料層
134、137 電気接続
210 梯子型フィルタ
212 追加膜状バルク音響共鳴器
Claims (14)
- 向かい合った平面電極、および該電極間の圧電材料の層を具備する、スタック状の対をなす膜状バルク音響共鳴器(FBAR)と、
前記FBAR間の音響デカップラと、
を備える、帯域フィルタ。 - 前記音響デカップラが、音響デカップリング材料の層を有する、請求項1に記載の帯域フィルタ。
- 前記圧電材料が音響インピーダンスを有することと、
前記音響デカップリング材料の音響インピーダンスが、前記圧電材料の音響インピーダンスと空気の音響インピーダンスの中間にあることを特徴とする、請求項2に記載の帯域フィルタ。 - 前記帯域フィルタが、中心周波数によって特性が決まることと、
前記音響デカップリング材料の層が、周波数が前記中心周波数等しい音波の、前記音響デカップリング材料内における波長の4分の1の奇整数倍に等しい公称厚さを有することを特徴とする、請求項2または3に記載の帯域フィルタ。 - 前記音響デカップリング材料にプラスチックが含まれる、請求項2、3、または、4に記載の帯域フィルタ。
- 前記プラスチック材料にポリイミドまたはポリ(パラキシリレン)が含まれる、請求項5に記載の帯域フィルタ。
- 前記音響デカップラが、ブラッグ構造を有する、請求項1に記載の帯域フィルタ。
- さらに、FBARの電極のうち隣接する電極間の電気的接続を具備する、請求項1から7のいずれかに記載の帯域フィルタ。
- さらに、前記スタック対をなすFBARに電気的に直列に接続された梯子型フィルタを備える、請求項1から8いずれかに記載の帯域フィルタ。
- 前記梯子型フィルタが追加FBARを具備する、請求項9に記載の帯域フィルタ。
- 電気的濾波方法であって、
先行請求項の任意の1つによる帯域フィルタを設けるステップと、
FBARの一方に入力電気信号を加えるステップと、
他方のFBARから濾波出力電気信号を取り出すステップとを有する、
方法。 - 音響結合素子を製作する方法であって、
第1の膜状バルク音響共鳴器(FBAR)を製作するステップと、
前記第1のFBAR上に音響デカップラを製作するステップと、
前記音響デカップラを最高温度にさらすことを含めて、前記音響デカップラ上に第2のFBARを製作するステップと、
前記第2のFBARの製作前に、前記第1のFBAR及び前記音響デカップラに前記最高温度以上の温度でベーキングを施すステップを有する、方法。 - 前記音響デカップラがポリイミドの層を有する、請求項12に記載の方法。
- 前記音響デカップラの製作ステップに、スピン・コーティングによるポリイミド層の付着が含まれる、請求項13に記載の方法。
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US10/699,289 US7019605B2 (en) | 2003-10-30 | 2003-10-30 | Stacked bulk acoustic resonator band-pass filter with controllable pass bandwidth |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2005137002A true JP2005137002A (ja) | 2005-05-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2004314021A Pending JP2005137002A (ja) | 2003-10-30 | 2004-10-28 | 通過帯域幅の制御が可能なスタック形バルク音響共鳴器用帯域フィルタ |
Country Status (5)
| Country | Link |
|---|---|
| US (2) | US7019605B2 (ja) |
| EP (1) | EP1528674B1 (ja) |
| JP (1) | JP2005137002A (ja) |
| CN (3) | CN100505535C (ja) |
| DE (1) | DE602004012511T2 (ja) |
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| JPWO2007052370A1 (ja) * | 2005-11-04 | 2009-04-30 | 株式会社村田製作所 | 圧電薄膜共振子 |
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| WO2010079614A1 (ja) | 2009-01-09 | 2010-07-15 | 太陽誘電株式会社 | フィルタ素子、分波器および電子装置 |
| JP2011176744A (ja) * | 2010-02-25 | 2011-09-08 | Taiyo Yuden Co Ltd | フィルタ、デュープレクサ、通信モジュール、通信装置 |
| JP2012100029A (ja) * | 2010-11-01 | 2012-05-24 | Taiyo Yuden Co Ltd | 弾性波デバイス |
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| JPWO2007052370A1 (ja) * | 2005-11-04 | 2009-04-30 | 株式会社村田製作所 | 圧電薄膜共振子 |
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| US7554427B2 (en) | 2007-01-15 | 2009-06-30 | Hitachi Media Electronics Co., Ltd. | Thin film bulk acoustic wave resonator and filter, and radio frequency module using them |
| WO2010079614A1 (ja) | 2009-01-09 | 2010-07-15 | 太陽誘電株式会社 | フィルタ素子、分波器および電子装置 |
| US8228138B2 (en) | 2009-01-09 | 2012-07-24 | Taiyo Yuden Co., Ltd. | Filter element, duplexer and electronic device having piezoelectric thin-film resonators stacked vertically |
| JP2011176744A (ja) * | 2010-02-25 | 2011-09-08 | Taiyo Yuden Co Ltd | フィルタ、デュープレクサ、通信モジュール、通信装置 |
| US9236848B2 (en) | 2010-02-25 | 2016-01-12 | Taiyo Yuden Co., Ltd. | Filter, duplexer, communication module and communication device |
| JP2012100029A (ja) * | 2010-11-01 | 2012-05-24 | Taiyo Yuden Co Ltd | 弾性波デバイス |
| US8841819B2 (en) | 2010-11-01 | 2014-09-23 | Taiyo Yuden Co., Ltd. | Acoustic wave device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1879300A (zh) | 2006-12-13 |
| US7019605B2 (en) | 2006-03-28 |
| CN1879300B (zh) | 2011-12-21 |
| US20060114080A1 (en) | 2006-06-01 |
| US7424772B2 (en) | 2008-09-16 |
| DE602004012511D1 (de) | 2008-04-30 |
| CN1902819A (zh) | 2007-01-24 |
| US20050093653A1 (en) | 2005-05-05 |
| CN1868121A (zh) | 2006-11-22 |
| DE602004012511T2 (de) | 2009-04-30 |
| CN1868121B (zh) | 2012-01-11 |
| EP1528674B1 (en) | 2008-03-19 |
| EP1528674A1 (en) | 2005-05-04 |
| CN100505535C (zh) | 2009-06-24 |
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