WO2004070947A1 - Mit akustischen oberflächenwellen arbeitendes elektronisches bauelement - Google Patents
Mit akustischen oberflächenwellen arbeitendes elektronisches bauelement Download PDFInfo
- Publication number
- WO2004070947A1 WO2004070947A1 PCT/EP2003/014351 EP0314351W WO2004070947A1 WO 2004070947 A1 WO2004070947 A1 WO 2004070947A1 EP 0314351 W EP0314351 W EP 0314351W WO 2004070947 A1 WO2004070947 A1 WO 2004070947A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- series
- converter
- track
- gate
- component according
- Prior art date
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
- H03H9/0023—Balance-unbalance or balance-balance networks
- H03H9/0028—Balance-unbalance or balance-balance networks using surface acoustic wave devices
- H03H9/0047—Balance-unbalance or balance-balance networks using surface acoustic wave devices having two acoustic tracks
- H03H9/0052—Balance-unbalance or balance-balance networks using surface acoustic wave devices having two acoustic tracks being electrically cascaded
- H03H9/0057—Balance-unbalance or balance-balance networks using surface acoustic wave devices having two acoustic tracks being electrically cascaded the balanced terminals being on the same side of the tracks
-
- 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
- H03H9/64—Filters using surface acoustic waves
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/0023—Balance-unbalance or balance-balance networks
- H03H9/0028—Balance-unbalance or balance-balance networks using surface acoustic wave devices
- H03H9/0047—Balance-unbalance or balance-balance networks using surface acoustic wave devices having two acoustic tracks
- H03H9/0052—Balance-unbalance or balance-balance networks using surface acoustic wave devices having two acoustic tracks being electrically cascaded
- H03H9/0061—Balance-unbalance or balance-balance networks using surface acoustic wave devices having two acoustic tracks being electrically cascaded the balanced terminals being on opposite sides of the tracks
-
- 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
-
- 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
- H03H9/14588—Horizontally-split transducers
-
- 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
- H03H9/64—Filters using surface acoustic waves
- H03H9/6423—Means for obtaining a particular transfer characteristic
- H03H9/6433—Coupled resonator filters
- H03H9/644—Coupled resonator filters having two acoustic tracks
- H03H9/6456—Coupled resonator filters having two acoustic tracks being electrically coupled
- H03H9/6469—Coupled resonator filters having two acoustic tracks being electrically coupled via two connecting electrodes
-
- 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
- H03H9/64—Filters using surface acoustic waves
- H03H9/6423—Means for obtaining a particular transfer characteristic
- H03H9/6433—Coupled resonator filters
- H03H9/6483—Ladder SAW filters
Definitions
- The. invention relates to a component working with near-surface acoustic waves, in particular a filter with a network structure, in which resonators are embedded.
- SAW Surface Acoustic Wave
- DMS Double Mode SAW
- the filters to be used in mobile communication end devices should have the lowest possible insertion loss of the useful signal.
- the use of modern modulation methods requires that filters used in the transmission or reception path have an increased selection or counterband suppression compared to conventional SAW filters.
- strain gauge filters are known for.
- B Interconnection of strain gauge filters with reactance elements, in particular with single-port resonators designed in SAW technology, which are characterized by a low insertion loss.
- a strain gauge filter is known from DE 198 18 038 A, in which two DMS filters connected in series or in parallel are connected in series with reactance elements on the input or output side.
- a DMS filter which is connected to a two-port resonator with two acoustically coupled series transducers, the series transducers being connected in series with one of the transducers of the DMS filter.
- the series branches are the Circuit connected between a symmetrically designed input and a symmetrically designed output.
- the object of this invention is to provide a component working with surface acoustic waves with a symmetrical and an asymmetrical gate and with a low insertion loss.
- the invention specifies a component which works with surface acoustic waves and which has a piezoelectric substrate and component structures arranged thereon.
- the component has a signal line with an asymmetrical first electrical gate (preferably an input gate) and a second electrical gate (preferably an output gate).
- the component according to the invention comprises a first and a second partial filter, which are connected in series between the first and the second electrical gate.
- the second gate is preferably symmetrical (balanced), i. H. trained with two signal-carrying connections. It is also possible for the second electrical gate to be asymmetrical (unbalanced, single-ended).
- the first sub-filter contains a first and a second series converter, which are arranged in an acoustic track and one behind the other or parallel to one another within the signal line, ie. H. are connected in series in the signal line, the first and the second series converter being acoustically coupled to one another.
- the second sub-filter comprises a strain gauge track which has a first coupling converter and a converter which is terminal in the signal line.
- the DMS track also has a second coupling converter.
- each track is delimited on both sides by reflectors.
- the first and / or the second coupling converter of the strain gauge track is (in each case) connected in series with at least one of the series converters.
- the second electrical gate is preferably connected to the terminal converter of the strain gauge track.
- a first, a second and a third acoustic track are provided.
- the first acoustic track contains at least one transducer (parallel transducer) or a plurality of parallel transducers which are acoustically coupled to one another.
- the second acoustic track has a first and a second series converter, which are acoustically coupled to one another.
- the third acoustic track is designed as a strain gauge track and in particular has at least two coupling transducers and at least one terminal transducer, which is preferably arranged between the coupling transducers.
- the series converter or the parallel converter (s) are connected in a ladder type arrangement in which the series converter (each)
- Series resonators of the ladder-type arrangement, and the parallel converter or converters in each case form a parallel resonator of the ladder-type arrangement ie are connected in parallel to the signal line against a reference potential (preferably ground).
- At least one of the series converters is electrically connected to one or more coupling converters of the strain gauge track, that is, for example, connected in series against a reference potential (ground).
- the signal-carrying connection of the first electrical gate (entrance gate) is connected to the second acoustic track.
- the second electrical gate (output gate) is connected to the terminal converter of the strain gauge track. It is always the same in all embodiments of the invention possible to interchange the respective assignment of the two electrical gates to input and output.
- the terminal transducer of the strain gauge track has at least two electrically connected partial transducers which are connected in series between the connections of the second electrical gate.
- the strain gauge track can have further coupling and / or terminal transducers, the coupling transducers and the terminal transducers being acoustically coupled to one another and at least partially arranged alternately.
- the component according to the invention is characterized by a low insertion loss compared to conventional strain gauge filters with two strain gauge tracks.
- the invention specifies a particularly space-saving ladder-type structure which is connected to a strain gauge track, particularly steep flanks of the transfer function and therefore has a high selection.
- it is possible to achieve a higher or sufficient image frequency suppression than with known electroacoustic components with comparable dimensions of the transducers.
- FIG. 1 shows a component according to the invention in a schematic representation (FIG. 1 a) and as a corresponding equivalent circuit diagram (FIG. 1 b)
- Figures lc to 7 show advantageous embodiments of a component according to the invention with a strain gauge track arranged on the output side
- FIGS. 8 to 11 show advantageous embodiments of a component according to the invention with a strain gauge track arranged on the input side
- FIG. 1 shows the basic structure of a component according to the invention.
- the component has a first acoustic track S1, a second acoustic track S2 and a strain gauge track S3, which are electrically connected to one another.
- the first and the second acoustic tracks form a first sub-filter
- the third acoustic track forms a second sub-filter.
- the first track S1 has a parallel converter W1, which is arranged between reflectors R11 and R12.
- the second acoustic track S2 contains a first series transducer W21 and a second series transducer acoustically coupled to it.
- the first series converter W21 is connected to the signal-carrying connection P1 of an input gate.
- the series converters W21 and W22 are each arranged in a series branch of the first and second base members of a ladder-type arrangement, and the parallel converter W1 is arranged in the parallel branch of the ladder-type arrangement.
- the converters W21, W22 and Wl form a T-member of a ladder-type arrangement known per se.
- the ladder-type structure thus formed is also electrically connected to coupling converters AW31, AW32 of the DMS track S3.
- the coupling transducers AW31, AW32 of the DMS track are acoustically coupled to the terminal transducer MW3.
- the terminal converter MW3 is connected to the connections P21, P22 of an output gate.
- the exit gate is designed here as a symmetrical electrical gate.
- the strain gauge track is delimited on both sides by reflectors R31, R32. It is possible that further, preferably acoustically coupled, parallel transducers W1 are provided in the first acoustic track S1, which are arranged (in each case) in parallel branches of the ladder-type arrangement.
- the second acoustic track S2 can have more than just two series converters, which are preferably acoustically coupled to one another and (in each case) arranged in series branches of the signal line, for example in each case in a series branch of different basic elements of the ladder-type arrangement. It is possible that the series converters mentioned (in each case) are electrically connected in series with the coupling converters AW31, AW32 of the strain gauge track.
- a further strain gauge track is cascaded with strain gauge track S3. It is also possible for a further acoustic track connected in series in the signal line with acoustically coupled series converters delimited on both sides by reflectors to be arranged on the input side.
- FIG. 1b shows the equivalent circuit diagram corresponding to the component according to FIG. i
- the series converters W21 and W22 form a series connection between the entrance gate and the coupling converters AW31, AW32 of the strain gauge track.
- the first series converter W21 is connected to the entrance gate.
- the second series resonator which is acoustically coupled to the first series converter W21, is connected on the one hand to the first series converter W21 and on the other hand to the coupling converters AW31, AW32 of the strain gauge track.
- Figure 2 shows a further advantageous embodiment of the invention.
- the entrance gate is connected to the parallel converter Wl.
- the second acoustic track has a first, a second and a third (W21, W22 or W23) series converter.
- the first series converter W21 of the second acoustic track is electrically connected to the first coupling converter AW31 of the strain gauge track.
- the third series converter W23 of the second acoustic track is electrically connected to the coupling converter AW32 of the strain gauge track.
- the signal-carrying connection P1 of the entrance gate is connected to the second series converter W22 of the second acoustic track.
- the first and third series converters W21, W23 are connected in series with the second series converter W22, the latter two being connected in parallel with one another.
- FIG. 4 shows a variant of the component according to the invention with the output gate, which is designed as an asymmetrical electrical gate with a signal-carrying connection P2.
- the signal-carrying connection P1 of the entrance gate can be connected to a reflector R23 arranged between the series transducers W21 and W23 of the second acoustic track.
- This reflector allows in particular the setting of the acoustic coupling between the series transducers surrounding it.
- partial converters MW31 or MW32 are used instead of the terminal converter MW3.
- the partial transducers MW31 and MW32 are connected in series between the connections P21 and P22 of the output gate in such a way that the signals at the connections P21 and P22 are electrically out of phase.
- the series connection of the partial converters MW31 and MW32 corresponds to a split Transducers, whereby in this variant, compared to the non-split transducer, it is possible to achieve a transducer impedance that is about a factor of 4 higher with the same number of electrode fingers.
- a reflector is arranged between transducers of the first (or the second) acoustic track lying next to one another. With the reflector arranged between the acoustically coupled transducers, it is possible, for example, to change the acoustic coupling.
- FIG. 7 shows a reflector R24 between the series converters W21 and W22 and a reflector R25 between the series converters W22 and W23 in the second acoustic track.
- the reflectors can each have interconnected metal strips. It is also possible that the
- Metal strips of the respective reflector are not connected to each other.
- the second sub-filter (the strain gauge track) is arranged on the side of the first gate (entrance gate).
- the terminal converter MW3 of the strain gauge track is connected in series with the signal line and acoustically coupled with the coupling converters AW31, AW32.
- the terminal converter MW3 of the DMS track and a series resonator, which comprises a converter W1 and reflectors R11, R12, are connected in series between the signal-carrying connection P1 of the first gate and a reference potential (ground).
- the first AW31 and the second AW32 coupling converter are connected in series with the first W21 and the second W22 series converter between the first P21 and the second P22 signal-carrying connection of the second electrical gate (output gates) and reference potential (ground) ,
- the first port P21 of the second port is connected to the first series converter W21 and the second port P22 of the second port is connected to the second series converter W22.
- a reflector R23 for controlling the acoustic coupling between the two transducers is arranged between the first W21 and the second W22 series transducer.
- the strain gauge track has two terminal transducers MW31 and MW32 arranged on the input side.
- the terminal converters MW31 and MW32 are arranged in a series branch of the signal line and connected in parallel to one another.
- the coupling converters AW31 and AW32 are arranged here side by side between the terminal converters MW31, MW32.
- the coupling converter AW31, AW32 can e.g. B. be designed as a partial converter of a converter, which are interconnected so that they deliver electrically out-of-phase signals.
- the converters W21, AW31, AW32 and W22 are connected in series between the first P21 and the second P22 connection of the second port, the first series converter W21 being connected to the first connection P21 and the second series converter W22 being connected to the second connection P22 of the second gate connected.
- FIG. 11 shows a further advantageous embodiment of the invention.
- the signal-carrying connection P1 of the first electrical gate is connected to the terminal converter MW31, MW32.
- the terminal converters MW31, MW32 are connected to a reference potential.
- the connection of the coupling transducers AW31, AW32 with the series transducers W21, W22 corresponds to the description in FIG. 10.
- the second electrical gate is connected to a further acoustic track with a first W41 and a second W42 transducer, which are delimited on both sides by reflectors R41, R42. connected.
- the first connection P21 of the second gate is connected to the first converter W41 and the second connection P22 of the second gate is connected to the second converter W42.
- the first W41 and the second W42 transducers are acoustically coupled and connected in series.
- the component according to the invention which has an asymmetrical electrical gate on one side (preferably at the input) and a symmetrical electrical gate on an opposite side (preferably at the output), has the advantage that it fulfills the function of a balun in addition to the function of a filter.
- This solution is particularly advantageous in the case of mobile radio devices, since the component according to the invention succeeds in eliminating space at the level of the terminal device by omitting a balun (usually designed as a discrete component) or by integrating the balun function in a front-end filter to save and minimize losses.
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/544,136 US7969259B2 (en) | 2003-02-04 | 2003-12-16 | Electronic component operated with surface acoustic waves |
JP2004567759A JP4393387B2 (ja) | 2003-02-04 | 2003-12-16 | 音響表面波でもって動作する電子的なモジュール |
KR1020057014271A KR101119619B1 (ko) | 2003-02-04 | 2003-12-16 | 표면탄성파로 작동하는 전자소자 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10304470A DE10304470B4 (de) | 2003-02-04 | 2003-02-04 | Mit akustischen Oberflächenwellen arbeitendes elektronisches Bauelement |
DE10304470.1 | 2003-02-04 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2004070947A1 true WO2004070947A1 (de) | 2004-08-19 |
Family
ID=32667992
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2003/014351 WO2004070947A1 (de) | 2003-02-04 | 2003-12-16 | Mit akustischen oberflächenwellen arbeitendes elektronisches bauelement |
Country Status (5)
Country | Link |
---|---|
US (1) | US7969259B2 (de) |
JP (1) | JP4393387B2 (de) |
KR (1) | KR101119619B1 (de) |
DE (1) | DE10304470B4 (de) |
WO (1) | WO2004070947A1 (de) |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102004048715B4 (de) * | 2004-10-06 | 2014-05-22 | Epcos Ag | SAW-Filter mit Impedanz-Transformation |
DE102005010658A1 (de) * | 2005-03-08 | 2006-09-14 | Epcos Ag | Duplexer mit verbesserter Leistungsverträglichkeit |
DE102006042546A1 (de) * | 2006-09-11 | 2008-03-27 | Epcos Ag | Mit Oberflächenwellen arbeitendes elektrisches Bauelement |
DE102006057340B4 (de) * | 2006-12-05 | 2014-05-22 | Epcos Ag | DMS-Filter mit verbesserter Anpassung |
DE102007008110A1 (de) * | 2007-02-19 | 2008-08-21 | Epcos Ag | Mit akustischen Wellen arbeitendes Filter |
DE112008002521B4 (de) * | 2007-10-01 | 2015-03-26 | Murata Manufacturing Co., Ltd. | Oberflächenschallwellenfiltervorrichtung |
DE102009032840B4 (de) * | 2009-07-13 | 2015-02-05 | Epcos Ag | SAW-Filterschaltung mit verbesserter ESD-Festigkeit |
DE102010021164B4 (de) * | 2010-05-21 | 2019-02-21 | Snaptrack, Inc. | Balanced/Unbalanced arbeitendes SAW Filter |
DE102010050581A1 (de) * | 2010-11-05 | 2012-05-10 | Epcos Ag | Chip mit vier mit akustischen Oberflächenwellen arbeitenden Filtern |
WO2014199682A1 (ja) * | 2013-06-13 | 2014-12-18 | 株式会社村田製作所 | 弾性表面波フィルタ装置およびデュプレクサ |
DE102014118000A1 (de) | 2014-12-05 | 2016-06-09 | Epcos Ag | Anordnung mit einem DMS Filter und steiler rechter Flanke |
CN112994643B (zh) * | 2021-05-18 | 2022-04-19 | 成都频岢微电子有限公司 | 一种高隔离度及防进胶saw双工器 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19818038A1 (de) * | 1998-04-22 | 1999-11-04 | Siemens Matsushita Components | Dualmode-Oberflächenwellenfilter |
DE19818826A1 (de) * | 1998-04-27 | 1999-11-04 | Siemens Matsushita Components | Oberflächenwellenfilter mit erhöhter Bandbreite |
DE10007178A1 (de) * | 2000-02-17 | 2001-08-23 | Epcos Ag | Oberflächenwellenfilter mit Reaktanzelementen |
Family Cites Families (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3886504A (en) * | 1974-05-20 | 1975-05-27 | Texas Instruments Inc | Acoustic surface wave resonator devices |
EP0600705B1 (de) | 1992-12-01 | 1999-01-20 | Japan Radio Co., Ltd | Akustischer Oberflächenwellenfilter und mobiles Kommunikationssystem mit solchem Filter |
JP3424971B2 (ja) * | 1994-01-20 | 2003-07-07 | 松下電器産業株式会社 | 弾性表面波フィルタ |
US5486800A (en) * | 1994-09-29 | 1996-01-23 | Motorola, Inc. | Surface acoustic wave device |
JPH08265087A (ja) | 1995-03-22 | 1996-10-11 | Mitsubishi Electric Corp | 弾性表面波フィルタ |
EP0757438B1 (de) | 1995-07-25 | 2001-08-16 | Murata Manufacturing Co., Ltd. | Akustische Oberflächenwellenanordnung |
DE19638370C2 (de) * | 1996-09-19 | 2001-06-13 | Epcos Ag | Oberflächenwellenfilter für unsymmetrische/symmetrische und symmetrische/symmetrische Betriebsweise |
JPH10284988A (ja) | 1997-04-09 | 1998-10-23 | Toyo Commun Equip Co Ltd | 弾性表面波フィルタ |
JP2000349591A (ja) * | 1999-06-08 | 2000-12-15 | Oki Electric Ind Co Ltd | 弾性表面波フィルタを用いた分波器 |
JP2001024475A (ja) * | 1999-07-09 | 2001-01-26 | Oki Electric Ind Co Ltd | 弾性表面波フィルタ |
JP4415360B2 (ja) * | 2000-01-28 | 2010-02-17 | エプソントヨコム株式会社 | 縦結合弾性表面波フィルタ |
JP2001267885A (ja) | 2000-03-17 | 2001-09-28 | Fujitsu Media Device Kk | 弾性表面波装置 |
DE10013861A1 (de) * | 2000-03-21 | 2001-09-27 | Epcos Ag | Dualmode-Oberflächenwellenfilter mit verbesserter Symmetrie und erhöhter Sperrdämpfung |
JP2001292050A (ja) * | 2000-04-10 | 2001-10-19 | Matsushita Electric Ind Co Ltd | 弾性表面波フィルタ |
DE10213277A1 (de) * | 2002-03-25 | 2003-10-16 | Epcos Ag | Multiport-Resonatorfilter |
KR101044971B1 (ko) * | 2003-07-30 | 2011-06-29 | 파나소닉 주식회사 | 탄성 표면파 필터 |
-
2003
- 2003-02-04 DE DE10304470A patent/DE10304470B4/de not_active Expired - Fee Related
- 2003-12-16 JP JP2004567759A patent/JP4393387B2/ja not_active Expired - Fee Related
- 2003-12-16 WO PCT/EP2003/014351 patent/WO2004070947A1/de active Application Filing
- 2003-12-16 US US10/544,136 patent/US7969259B2/en active Active
- 2003-12-16 KR KR1020057014271A patent/KR101119619B1/ko active IP Right Grant
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19818038A1 (de) * | 1998-04-22 | 1999-11-04 | Siemens Matsushita Components | Dualmode-Oberflächenwellenfilter |
DE19818826A1 (de) * | 1998-04-27 | 1999-11-04 | Siemens Matsushita Components | Oberflächenwellenfilter mit erhöhter Bandbreite |
DE10007178A1 (de) * | 2000-02-17 | 2001-08-23 | Epcos Ag | Oberflächenwellenfilter mit Reaktanzelementen |
Also Published As
Publication number | Publication date |
---|---|
US7969259B2 (en) | 2011-06-28 |
DE10304470A1 (de) | 2004-08-05 |
US20060097824A1 (en) | 2006-05-11 |
DE10304470B4 (de) | 2013-09-05 |
JP2006514460A (ja) | 2006-04-27 |
KR20050095644A (ko) | 2005-09-29 |
JP4393387B2 (ja) | 2010-01-06 |
KR101119619B1 (ko) | 2012-03-13 |
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