EP1368894A1 - Mit akustischen wellen arbeitende wandlerstruktur - Google Patents
Mit akustischen wellen arbeitende wandlerstrukturInfo
- Publication number
- EP1368894A1 EP1368894A1 EP02721986A EP02721986A EP1368894A1 EP 1368894 A1 EP1368894 A1 EP 1368894A1 EP 02721986 A EP02721986 A EP 02721986A EP 02721986 A EP02721986 A EP 02721986A EP 1368894 A1 EP1368894 A1 EP 1368894A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- transducer
- structure according
- finger
- idt
- interdigital
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- 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
- H03H9/125—Driving means, e.g. electrodes, coils
- H03H9/145—Driving means, e.g. electrodes, coils for networks using surface acoustic waves
- H03H9/14544—Transducers of particular shape or position
- H03H9/14555—Chirped transducers
Definitions
- the invention relates to a transducer structure working with acoustic waves, in particular for a surface wave filter (SAW or SAW filter) or an S-BAR filter (bulk acoustic wave resonator).
- a surface wave filter SAW or SAW filter
- S-BAR filter bulk acoustic wave resonator
- transducer structures for example SAW resonators
- SAW resonators are used as impedance elements with acoustic waves.
- Such a resonator is constructed from metallic electrode structures on the surface of a piezoelectric substrate and has an interdigital transducer with at least two connections, which is generally arranged between two reflectors.
- Known resonators have interdigital transducers which are characterized by a finger period and finger width which are homogeneous over the entire transducer. Each resonator has a so-called resonance and an anti-resonance frequency. The frequency position and the intensity of resonance and anti-resonance can be influenced by varying the apertures, the number of fingers and the finger period. The frequency spacing between the resonance and anti-resonance frequencies and their shape is retained.
- the resonators are used as impedance elements and connected to form a ladder-like arrangement.
- resonators are arranged in a serial and at least one, but preferably a plurality of parallel branches.
- the resonance frequency of a resonator in the serial branch is set so that it approximately corresponds to the anti-resonance frequency of a resonator in the parallel branch.
- More complex filters with a plurality of parallel branches and serial resonators arranged in between can be constructed from a plurality of basic elements, each comprising a parallel and a serial resonator.
- the interaction of the resonances of the individual resonators produces a desired band-pass retention of the filter.
- the resonance frequencies of the individual resonators and the intensity of the resonances are suitably set.
- finger periods, number of fingers and apertures of the individual resonators are the known degrees of freedom.
- An ideal filter has good electrical adaptation, good damping behavior in the stop band and the lowest possible insertion loss in the pass band. It is disadvantageous, however, that the properties mentioned cannot usually be optimized at the same time, so that only a suitable combination of properties can always be obtained, but not an optimal filter in all properties.
- broadband filters that have a relative bandwidth of more than 2% or with filters that are built on substrates with low electro-acoustic coupling, for example on LiTaC> 3 in conjunction with a small layer thickness or on quartz, optimization only at a non-optimal level Filters with unsatisfactory properties.
- the object of the present invention is to provide a transducer structure which operates with acoustic waves and which has at least one further degree of freedom in the
- a transducer structure has one or more between
- Interdigital transducers arranged on reflectors. These in turn include electrode fingers connected to bus bars, that mesh like a comb.
- the filter can be a DMS, a TCF or a reactance filter.
- the reflection at the input or output of the filter can be minimized with a transducer structure with a varying finger period.
- the standing wave ratio can be reduced in the case of a reactance filter used in the high frequency range.
- the resonators according to the invention can be used to construct reactance filters which have an improved passband and in particular an improved insertion loss.
- the finger spacing can be varied in such a way that the concrete values for the finger spacing (finger periods) plotted over the length of the interdigital transducer come to lie on a curve corresponding to a continuous function.
- the concrete values for the finger spacing at a point x thus correspond to those scanned at point x
- a quasi-continuous function is preferably selected. Such a function shows no jumps.
- a further advantageous variation of the finger spacing is obtained if the said distribution of the finger spacing over the length of the transducer follows a function which is symmetrical about an axis perpendicular to the direction of wave propagation, the axis preferably being in the vicinity of the center of the transducer.
- a function is preferably selected which has a maximum at the mirror axis.
- a simple variation of the finger spacing over the length of the interdigital transducer follows a linear function in which the finger spacing increases or decreases linearly in one direction.
- the distribution of the finger distances can be such that the increase takes place from one end to the other end of the interdigital transducer, or that the increase or decrease takes place up to the mirror axis in order to then decrease or increase again.
- the finger distances are varied by a mean value up to a maximum of +/- 2.5%, so that there is a maximum difference of 5% between two finger distances.
- interdigital converters according to the invention have maximum differences of 2 to 3%, for example of 3%.
- Advantageous improvements in reactance filters are already achieved with fewer differences than, for example, strain gauge filters. The latter can take full advantage of the specified range of variation and have a difference of up to 5%.
- a resonator according to the invention results from an additional variation in the finger widths of the electrode fingers over the length of the interdigital transducer.
- This variation also preferably follows a continuous function.
- the finger widths can be varied so that the metallization ratio remains constant over the length of the transducer.
- the metallization ratio increases or decreases continuously over the length of the transducer or in which the metallization ratio of the corresponding distribution
- ⁇ ⁇ ⁇ H- 3 0 ⁇ P- ⁇ P- p. s: Di Di P- SD rr ⁇ p- 3 rr Q tr H- LQ 3 LQ ⁇ ⁇ tn 0
- resonators according to the invention or filters made from them are constructed in the case of poor electro-acoustic coupling, for example on lithium tantalate with a small layer thickness. Under such conditions, better electrical adaptation is achieved through improved electroacoustic behavior.
- Figure 1 shows a known resonator.
- Figure 2 shows a known structure for a reactance filter.
- Figure 3 shows a resonator according to the invention.
- FIGS. 4 to 6 show functions according to the invention for distributing the finger widths over the length of the transducer.
- FIG. 7 compares the standing wave ratio of known reactance filters according to the invention.
- FIG. 8 compares the transmission behavior of a reactance filter according to the invention with that of a known reactance filter.
- FIG. 1 A resonator operating with acoustic waves is shown in FIG. 1.
- the metallic electrode structures which consist for example of aluminum, an aluminum alloy or a multilayer structure comprising aluminum layers, are applied to a piezoelectric substrate.
- the resonator consists of one
- Interdigital transducer IDT which is arranged between two reflectors Ref. Each interdigital converter IDT consists of )> tt P 1 H in o in o in o in
- the finger distances P are plotted over the number of fingers n on a preferably continuous function, in FIG. on a straight line.
- the finger distance P falls from a maximum finger distance Pmax to a minimum finger distance Pmin over the length of the transducer.
- distributions of the finger spacings are also possible, as are shown, for example, in FIGS. 5 and 6.
- a linear distribution over the length of the transducer is also shown in FIG. 5, the overall distribution function being composed of two linear subfunctions which a mirror axis lying in the area of a central electrode finger Nm and vertically to the wave propagation direction X are arranged symmetrically to one another.
- FIG. 6 shows a distribution of the finger distances P, which corresponds to a parabolic function, the maximum of which is located in the region of the center of the converter.
- Resonator which has an interdigital transducer IDT V shown in Figure 3 with linearly varying finger spacing, used to produce a reactance filter.
- resonators are interconnected to form a reactance filter as shown in FIG.
- ⁇ P SU tr ⁇ P LQ rr LQ M ⁇ P 3 0 ⁇ • d ⁇ P- N ⁇ ⁇ P P- d
- SD CD ra ⁇ P- P- rr ra 2 ⁇ d " ⁇ ⁇ 3 ⁇ ⁇ tr ⁇ ⁇ ⁇ 3 ⁇ P P-
- CD CD SD P- tr P- P- CO 3 ⁇ ⁇ - 3 ⁇ Di P "ra rr ⁇ P 1 SD P P- N rr er 3 LQ su ra 3 ⁇ P- rr SU P ⁇ CD SD ⁇ ö ⁇ rr er CD Mi t rr
Landscapes
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10111959.3A DE10111959B4 (de) | 2001-03-13 | 2001-03-13 | Mit akustischen Wellen arbeitende Wandlerstruktur |
DE10111959 | 2001-03-13 | ||
PCT/DE2002/000755 WO2002073800A1 (de) | 2001-03-13 | 2002-03-01 | Mit akustischen wellen arbeitende wandlerstruktur |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1368894A1 true EP1368894A1 (de) | 2003-12-10 |
Family
ID=7677235
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02721986A Withdrawn EP1368894A1 (de) | 2001-03-13 | 2002-03-01 | Mit akustischen wellen arbeitende wandlerstruktur |
Country Status (5)
Country | Link |
---|---|
US (1) | US7042132B2 (ja) |
EP (1) | EP1368894A1 (ja) |
JP (1) | JP4017984B2 (ja) |
DE (1) | DE10111959B4 (ja) |
WO (1) | WO2002073800A1 (ja) |
Families Citing this family (56)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN100566151C (zh) * | 2004-01-09 | 2009-12-02 | 松下电器产业株式会社 | 声表面波谐振器与采用该声表面波谐振器的声表面波滤波器 |
DE102004020183B4 (de) | 2004-04-22 | 2015-12-03 | Epcos Ag | Oberflächenwellen-Resonatorfilter mit longitudinal gekoppelten Wandlern |
KR20120038552A (ko) * | 2004-04-28 | 2012-04-23 | 파나소닉 주식회사 | 탄성 표면파 공진자 |
DE102004048715B4 (de) * | 2004-10-06 | 2014-05-22 | Epcos Ag | SAW-Filter mit Impedanz-Transformation |
DE102005051852B4 (de) | 2005-10-28 | 2021-05-20 | Snaptrack, Inc. | SAW Filter mit breitbandiger Bandsperre |
DE102008037091A1 (de) * | 2008-08-08 | 2010-02-11 | Epcos Ag | SAW-Bauelement |
US8299680B2 (en) * | 2008-10-24 | 2012-10-30 | Seiko Epson Corporation | Surface acoustic wave resonator, surface acoustic wave oscillator, and surface acoustic wave module unit |
KR20110081865A (ko) * | 2008-10-24 | 2011-07-14 | 엡슨 토요콤 가부시키 가이샤 | 탄성 표면파 공진자, 탄성 표면파 발진기 및 탄성 표면파 모듈 장치 |
JP5239741B2 (ja) | 2008-10-24 | 2013-07-17 | セイコーエプソン株式会社 | 弾性表面波共振子、弾性表面波発振器および弾性表面波モジュール装置 |
WO2010047112A1 (ja) | 2008-10-24 | 2010-04-29 | エプソントヨコム株式会社 | 弾性表面波共振子、弾性表面波発振器および弾性表面波モジュール装置 |
CN102244188A (zh) * | 2010-05-13 | 2011-11-16 | 展晶科技(深圳)有限公司 | 发光二极管芯片的电极结构 |
DE102010048965B4 (de) * | 2010-10-20 | 2015-01-22 | Epcos Ag | Bandsperrfilter mit einer Serienverschaltung von zumindest zwei pi-Gliedern |
DE102014111828A1 (de) * | 2014-08-19 | 2016-02-25 | Epcos Ag | Mit akustischen Oberflächenwellen arbeitender Eintorresonator |
US9853624B2 (en) | 2015-06-26 | 2017-12-26 | Qorvo Us, Inc. | SAW resonator with resonant cavities |
DE102017121221A1 (de) * | 2017-09-13 | 2019-03-14 | RF360 Europe GmbH | SAW-Resonator und diesen umfassendes Filter |
US10461720B2 (en) | 2017-09-21 | 2019-10-29 | Snaptrack, Inc. | Acoustic filter |
US11323090B2 (en) | 2018-06-15 | 2022-05-03 | Resonant Inc. | Transversely-excited film bulk acoustic resonator using Y-X-cut lithium niobate for high power applications |
US10637438B2 (en) | 2018-06-15 | 2020-04-28 | Resonant Inc. | Transversely-excited film bulk acoustic resonators for high power applications |
US20220247384A1 (en) * | 2021-02-03 | 2022-08-04 | Resonant Inc. | Transversely-excited film bulk acoustic resonator with multi-mark interdigital transducer |
US11206009B2 (en) | 2019-08-28 | 2021-12-21 | Resonant Inc. | Transversely-excited film bulk acoustic resonator with interdigital transducer with varied mark and pitch |
US11936358B2 (en) | 2020-11-11 | 2024-03-19 | Murata Manufacturing Co., Ltd. | Transversely-excited film bulk acoustic resonator with low thermal impedance |
US11323089B2 (en) | 2018-06-15 | 2022-05-03 | Resonant Inc. | Filter using piezoelectric film bonded to high resistivity silicon substrate with trap-rich layer |
US11996827B2 (en) | 2018-06-15 | 2024-05-28 | Murata Manufacturing Co., Ltd. | Transversely-excited film bulk acoustic resonator with periodic etched holes |
US11146232B2 (en) | 2018-06-15 | 2021-10-12 | Resonant Inc. | Transversely-excited film bulk acoustic resonator with reduced spurious modes |
US20220116015A1 (en) | 2018-06-15 | 2022-04-14 | Resonant Inc. | Transversely-excited film bulk acoustic resonator with optimized electrode thickness, mark, and pitch |
US10911023B2 (en) | 2018-06-15 | 2021-02-02 | Resonant Inc. | Transversely-excited film bulk acoustic resonator with etch-stop layer |
US11323096B2 (en) | 2018-06-15 | 2022-05-03 | Resonant Inc. | Transversely-excited film bulk acoustic resonator with periodic etched holes |
US12040781B2 (en) | 2018-06-15 | 2024-07-16 | Murata Manufacturing Co., Ltd. | Transversely-excited film bulk acoustic resonator package |
US11996822B2 (en) | 2018-06-15 | 2024-05-28 | Murata Manufacturing Co., Ltd. | Wide bandwidth time division duplex transceiver |
US10985728B2 (en) | 2018-06-15 | 2021-04-20 | Resonant Inc. | Transversely-excited film bulk acoustic resonator and filter with a uniform-thickness dielectric overlayer |
US12009798B2 (en) | 2018-06-15 | 2024-06-11 | Murata Manufacturing Co., Ltd. | Transversely-excited film bulk acoustic resonators with electrodes having irregular hexagon cross-sectional shapes |
US10826462B2 (en) | 2018-06-15 | 2020-11-03 | Resonant Inc. | Transversely-excited film bulk acoustic resonators with molybdenum conductors |
US11916539B2 (en) | 2020-02-28 | 2024-02-27 | Murata Manufacturing Co., Ltd. | Split-ladder band N77 filter using transversely-excited film bulk acoustic resonators |
US11876498B2 (en) | 2018-06-15 | 2024-01-16 | Murata Manufacturing Co., Ltd. | Transversely-excited film bulk acoustic resonator with multiple diaphragm thicknesses and fabrication method |
US11901878B2 (en) | 2018-06-15 | 2024-02-13 | Murata Manufacturing Co., Ltd. | Transversely-excited film bulk acoustic resonators with two-layer electrodes with a wider top layer |
US10917072B2 (en) | 2019-06-24 | 2021-02-09 | Resonant Inc. | Split ladder acoustic wave filters |
US11888463B2 (en) | 2018-06-15 | 2024-01-30 | Murata Manufacturing Co., Ltd. | Multi-port filter using transversely-excited film bulk acoustic resonators |
US11264966B2 (en) | 2018-06-15 | 2022-03-01 | Resonant Inc. | Solidly-mounted transversely-excited film bulk acoustic resonator with diamond layers in Bragg reflector stack |
US12021496B2 (en) | 2020-08-31 | 2024-06-25 | Murata Manufacturing Co., Ltd. | Resonators with different membrane thicknesses on the same die |
US10998882B2 (en) | 2018-06-15 | 2021-05-04 | Resonant Inc. | XBAR resonators with non-rectangular diaphragms |
US11374549B2 (en) | 2018-06-15 | 2022-06-28 | Resonant Inc. | Filter using transversely-excited film bulk acoustic resonators with divided frequency-setting dielectric layers |
US11146238B2 (en) | 2018-06-15 | 2021-10-12 | Resonant Inc. | Film bulk acoustic resonator fabrication method |
US11323091B2 (en) | 2018-06-15 | 2022-05-03 | Resonant Inc. | Transversely-excited film bulk acoustic resonator with diaphragm support pedestals |
US11909381B2 (en) | 2018-06-15 | 2024-02-20 | Murata Manufacturing Co., Ltd. | Transversely-excited film bulk acoustic resonators with two-layer electrodes having a narrower top layer |
US11967945B2 (en) | 2018-06-15 | 2024-04-23 | Murata Manufacturing Co., Ltd. | Transversly-excited film bulk acoustic resonators and filters |
US11949402B2 (en) | 2020-08-31 | 2024-04-02 | Murata Manufacturing Co., Ltd. | Resonators with different membrane thicknesses on the same die |
CN109781087B (zh) * | 2018-12-05 | 2022-09-16 | 中北大学 | 一种基于驻波模式的saw陀螺仪 |
DE102019103490A1 (de) * | 2018-12-07 | 2020-06-10 | RF360 Europe GmbH | Mikroakustischer Kondensator |
JP7484045B2 (ja) * | 2019-01-30 | 2024-05-16 | 太陽誘電株式会社 | フィルタおよびマルチプレクサ |
WO2020186261A1 (en) | 2019-03-14 | 2020-09-17 | Resonant Inc. | Transversely-excited film bulk acoustic resonator with half-lambda dielectric layer |
DE102019108843A1 (de) | 2019-04-04 | 2020-10-08 | RF360 Europe GmbH | Modifizierter SAW-Wandler, SAW-Resonator und SAW-Filter, das diese umfasst |
US20210273629A1 (en) * | 2020-02-28 | 2021-09-02 | Resonant Inc. | Transversely-excited film bulk acoustic resonator with multi-pitch interdigital transducer |
US11811391B2 (en) | 2020-05-04 | 2023-11-07 | Murata Manufacturing Co., Ltd. | Transversely-excited film bulk acoustic resonator with etched conductor patterns |
US11742828B2 (en) | 2020-06-30 | 2023-08-29 | Murata Manufacturing Co., Ltd. | Transversely-excited film bulk acoustic resonator with symmetric diaphragm |
US11405017B2 (en) | 2020-10-05 | 2022-08-02 | Resonant Inc. | Acoustic matrix filters and radios using acoustic matrix filters |
WO2023200670A1 (en) * | 2022-04-12 | 2023-10-19 | Murata Manufacturing Co., Ltd. | Ladder filter with transversely-excited film bulk acoustic resonators having different pitches |
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FR2036374A5 (ja) * | 1969-03-12 | 1970-12-24 | Thomson Csf | |
US4162465A (en) * | 1977-09-14 | 1979-07-24 | University Of Illinois Foundation | Surface acoustic wave device with reflection suppression |
US4473888A (en) * | 1981-10-28 | 1984-09-25 | The United States Of America As Represented By The Secretary Of The Army | Saw monolithic convolver using dispersive transducers |
EP0104314A3 (de) * | 1982-09-07 | 1985-09-11 | Siemens-Albis Aktiengesellschaft | SAW-Filter |
GB8327551D0 (en) * | 1983-10-14 | 1983-11-16 | Secr Defence | Acoustic transducer |
FR2638047B1 (ja) * | 1988-10-14 | 1990-11-23 | Thomson Csf | |
DE4010310A1 (de) * | 1990-03-30 | 1991-10-02 | Siemens Ag | Oberflaechenwellenwandler, insbesondere in splitfinger-ausfuehrung, mit unterdrueckung von reflexionen endstaendiger wandlerfinger |
JP2847438B2 (ja) * | 1991-03-29 | 1999-01-20 | 三井金属鉱業株式会社 | 弾性表面波素子 |
US5568001A (en) * | 1994-11-25 | 1996-10-22 | Motorola, Inc. | Saw device having acoustic elements with diverse mass loading and method for forming same |
DE19730710C2 (de) * | 1997-07-17 | 2002-12-05 | Epcos Ag | Oberflächenwellenakustikfilter mit verbesserter Flankensteilheit |
JP3687566B2 (ja) * | 2000-07-25 | 2005-08-24 | 株式会社村田製作所 | 縦結合共振子型弾性表面波フィルタ |
-
2001
- 2001-03-13 DE DE10111959.3A patent/DE10111959B4/de not_active Expired - Lifetime
-
2002
- 2002-03-01 WO PCT/DE2002/000755 patent/WO2002073800A1/de active Application Filing
- 2002-03-01 US US10/471,987 patent/US7042132B2/en not_active Expired - Lifetime
- 2002-03-01 JP JP2002572725A patent/JP4017984B2/ja not_active Expired - Fee Related
- 2002-03-01 EP EP02721986A patent/EP1368894A1/de not_active Withdrawn
Non-Patent Citations (1)
Title |
---|
See references of WO02073800A1 * |
Also Published As
Publication number | Publication date |
---|---|
US20040090145A1 (en) | 2004-05-13 |
DE10111959B4 (de) | 2014-11-20 |
US7042132B2 (en) | 2006-05-09 |
JP2004523179A (ja) | 2004-07-29 |
JP4017984B2 (ja) | 2007-12-05 |
DE10111959A1 (de) | 2002-09-19 |
WO2002073800A1 (de) | 2002-09-19 |
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Inventor name: RITTER, DIETMAR Inventor name: DETLEFSEN, ANDREAS Inventor name: BUENNER, MARTIN Inventor name: BAUER, THOMAS |
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