WO2003012987A1 - Wandler für oberflächenwellen mit verbesserter unterdrückung störender anregung - Google Patents
Wandler für oberflächenwellen mit verbesserter unterdrückung störender anregung Download PDFInfo
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- WO2003012987A1 WO2003012987A1 PCT/DE2002/001835 DE0201835W WO03012987A1 WO 2003012987 A1 WO2003012987 A1 WO 2003012987A1 DE 0201835 W DE0201835 W DE 0201835W WO 03012987 A1 WO03012987 A1 WO 03012987A1
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- gaps
- transducer
- finger
- converter
- variation
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- 230000005284 excitation Effects 0.000 title claims abstract description 42
- 230000002452 interceptive effect Effects 0.000 title abstract description 7
- 230000001629 suppression Effects 0.000 title description 3
- 230000000737 periodic effect Effects 0.000 claims description 22
- 239000000758 substrate Substances 0.000 claims description 7
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- 230000001788 irregular Effects 0.000 claims description 4
- 230000009977 dual effect Effects 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- WSMQKESQZFQMFW-UHFFFAOYSA-N 5-methyl-pyrazole-3-carboxylic acid Chemical compound CC1=CC(C(O)=O)=NN1 WSMQKESQZFQMFW-UHFFFAOYSA-N 0.000 claims description 2
- 238000006073 displacement reaction Methods 0.000 claims description 2
- GQYHUHYESMUTHG-UHFFFAOYSA-N lithium niobate Chemical compound [Li+].[O-][Nb](=O)=O GQYHUHYESMUTHG-UHFFFAOYSA-N 0.000 claims description 2
- 239000010453 quartz Substances 0.000 claims description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 2
- 239000002356 single layer Substances 0.000 claims 1
- 230000008859 change Effects 0.000 abstract description 8
- 238000003780 insertion Methods 0.000 description 10
- 230000037431 insertion Effects 0.000 description 10
- 230000005540 biological transmission Effects 0.000 description 6
- 238000013461 design Methods 0.000 description 6
- 230000003247 decreasing effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000010408 film Substances 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000010897 surface acoustic wave method Methods 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
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- 230000003993 interaction Effects 0.000 description 1
- 238000012886 linear function Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
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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
- H03H9/02535—Details of surface acoustic wave devices
- H03H9/02992—Details of bus bars, contact pads or other electrical connections for finger 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
- H03H9/02—Details
- H03H9/125—Driving means, e.g. electrodes, coils
- H03H9/145—Driving means, e.g. electrodes, coils for networks using surface acoustic waves
- H03H9/14517—Means for weighting
- H03H9/1452—Means for weighting by finger overlap length, apodisation
-
- 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
-
- 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
- H03H9/14547—Fan shaped; Tilted; Shifted; Slanted; Tapered; Arched; Stepped finger transducers
Definitions
- a surface acoustic wave component comprises at least one electroacoustic transducer, which is arranged on a crystalline or ceramic piezoelectric substrate or on a piezoelectric thin film.
- the electroacoustic transducer has a periodic finger structure, the fingers usually being alternately connected to two different collecting electrodes (bus bars). The period of the finger structure determines the resonance frequency of the transducer, which corresponds to the frequency at which the electroacoustic conversion takes place with the greatest efficiency.
- the impedance of the resonator is almost zero at the resonance frequency.
- the important properties of the transducer are essentially determined by the number, width, distance and connection sequence of the electrode fingers as well as by the aperture of the transducer. As a rule, these are selected such that, as far as possible, only an acoustic oscillation mode is excited, to which the design is optimized with respect to the aforementioned variable parameters.
- reactance filters from surface wave single gate resonators.
- An important parameter of these reactance filters is the insertion loss, which corresponds to the maximum attenuation of a signal passing through the filter in the pass band. Anything that increases the insertion loss deteriorates the performance of the overall system, so that even the slightest losses can be avoided.
- Resonators used in the parallel branch of reactance filters should have one above their resonance frequency have as small as possible a real part of the input admittance.
- a real part of the input admittance of the parallel resonator which is different from Mull there, leads to an undesired conductivity in the passband of the reactance filter and thus to an outflow of signal energy and thus to an increased insertion loss.
- the input admittance of a single-gate resonator commonly used today now shows a shoulder in precisely this area, which therefore leads to increased insertion loss in a reactance filter. So far, no measures are known for this shoulder, which has already been recognized by others, in order to effectively suppress it.
- the invention is based not least on the fact that the loss mechanism mentioned could be assigned by the inventors.
- This residual conductivity could be assigned to a disturbing excitation in the area of the transverse gaps, which leads to an additional conductance that lies between the resonance and the center of the stop band.
- This direct excitation only partially takes part in the reflection process, since with a normal finger transducer there is a gap on every second finger in the gap area and therefore every second finger as a reflection point fails. Nevertheless, the excitation takes place via stray fields, which leads to an excitation in the gap area with an approximate (sin x) / x behavior.
- This excitation which manifests itself as a parallel conductance, must be taken into account in the admittance of the main excitation.
- the invention now specifies a transducer in which this disturbing excitation in the gap area is modified in such a way that it is either suppressed or shifted to a frequency position at which it does not interfere, e.g. sufficiently removed from the passband, or if there is already sufficient attenuation.
- a transducer according to the invention is constructed in a conventional manner with regard to the number, width, longitudinal position and connection sequence of the fingers and with regard to its aperture, whereby the essential properties of the transducer, which determine its main vibration mode, are defined.
- the gaps are subjected to a variation with respect to at least one feature which is selected from the transverse arrangement, size and shape of the gaps. The change in dimension of the gaps or the amount of displacement of the gaps caused by the variation is kept small in comparison to the finger length.
- a preferred method for suppressing the disturbing excitation is obtained when the gaps are not varied statistically, but periodically or quasi-periodically. This is already achieved when one of the gap features to be varied can be expressed as a one-dimensional quantity, which then varies from gap to gap in such a way that the individual Gap features follow a periodic envelope over the length of the transducer.
- each group can include the same or a different number of gaps.
- Each group can have a pattern formed by the total number of gaps belonging to the group, which pattern is defined by the relative transverse arrangement, the size and / or the shape of the gaps within the group.
- the periodic variation can now take place by changing at least one parameter from group to group.
- the invention it is possible to suppress the undesirable excitation or to shift it so far that it no longer occurs in a disruptive manner.
- the main mode which determines the essential properties and in particular the passband of the filter, remains practically unchanged.
- the invention can therefore be used regardless of a given transducer design in all types of transducers which have a plurality of interdigitated electrode fingers.
- the invention makes use of the fact that the disturbing excitation in the gap area has a (sin x) / x behavior which, like normal excitation, can also be changed and influenced accordingly.
- the assignment of at least two gaps to a group and their periodic change across all groups means that the excitation function (in this case, the disturbing excitation in the gap area) is multiplied in the time domain by a function whose period corresponds to the length of a group , For example, If groups are formed into two gaps each and these groups are transversely and alternately offset from one another, the disturbing excitation results in a convolution in the frequency domain, which leads to a splitting of the excitation.
- the original admittance that is disruptive in the stop band thus becomes two new admittances that are considerably reduced in strength compared to the originally disruptive and are far from the stop band and therefore no longer interfere.
- gaps or gap groups in the transducer according to the invention lead to a more complex splitting of the original disturbing excitation in the gap area. Regardless of the type of modification, this leads both to a shift and to a reduction in the disturbing excitation or the disturbing conductance of the transducer.
- Variables are gap spacing, transverse position and shape of the gap. The variation can affect one, several or all of these features. During transverse position and
- Gap distance size of the gap or transversal distance of the finger ends
- the shape of the gaps represents only a zero dimension sional size at which the variation is undirected or cannot follow a variation function.
- Variations on the gap shape alone are preferably carried out so that groups of gaps each having the same shape of the gaps or a pattern of different gap shapes are formed, and that the gap shape or the pattern of the gap shapes varies from group to group.
- the shape of the gaps is determined by the two-dimensional design of the finger ends, which is rectangular in conventional transducer fingers.
- Transducers according to the invention can have finger ends of any shape, for example rounded or beveled, or have another shape.
- the invention also includes a variation in the gap spacing, it is preferably designed with a minimal size, since in this way the disruptive excitation that arises only through the gaps can be further suppressed.
- finger sections that are not galvanically connected to the other electrode fingers or to the busbars are provided in the gap area.
- Another easy way to vary is to simultaneously vary the transverse gap position and gap distance. Such a variation is obtained if the finger ends of the transducer fingers and the associated stub fingers of the opposite busbar are viewed independently of one another and, viewed over the length of the transducer, are varied independently according to a function in the transverse arrangement.
- the variation of the transverse position of the electrode finger ends and stub finger ends can take place independently, but preferably with the same period.
- Butt finger end and the corresponding electrode finger end are formed, but between the electrode finger end and the corresponding adjacent bus bar.
- the position of the electrode finger ends can be varied via the transducer to vary the gap size.
- the variation of the transverse gap position in transducers according to the invention without a stub finger is also achieved by varying the width of the busbar. The edge of the busbar pointing towards the end of the finger can follow the position of the end of the finger, so that the area of a short electrode finger of the busbar is of the same degree wider and there is a constant gap distance. Different gap distances are also ne variation of the gap shape possible with such transducers without stub fingers.
- Transducers according to the invention can have a variation in the gap area on only one side of the converter, that is to say in the area of only one busbar, but preferably on both sides.
- the variation is preferably carried out in the same way on both sides. In the case of strongly different transducer environments on different sides, however, it can also be advantageous to design the variation of the gaps on both sides accordingly differently.
- the gaps are combined into groups, each of which in turn comprise at least two subgroups.
- Each subgroup has a subgroup pattern formed from the size and / or shape of the gaps and / or from the relative transverse position of the gaps within the subgroup.
- At least two different subgroup patterns are provided in each group, which occur alternately at least once per group.
- each subgroup pattern can also have a periodic variation with respect to at least one feature. In this way, it is possible to modulate the excitation in the gap area with at least two different functions that have different periods. This leads to a multiple splitting of the interfering admittance and thus to a further improved suppression of the interfering signal in the excitation behavior of the converter according to the invention.
- Periodic variations within a subgroup or within a group with regard to the transverse arrangement and / or size of the gaps can be carried out sinusoidally, triangularly, sawtoothedly, semicircularly or following other periodic functions.
- the variation can also be linear or comprise a combination of several linear variations.
- the variation in the absolute transverse position of the gaps in the Transducer or be linear with respect to the relative transverse position of the gaps within a group or subgroup.
- a periodic variation can also include, for example, a combination of linearly increasing and linearly decreasing gap positions. In the same way, such a variation can of course also affect the gap size, ie the distance from the electrode finger ends to the stub finger ends.
- linear variations or combinations of linear variations of at least one feature of the gaps can also be combined with other variations, for example the sinusoidal or semicircular variations.
- the shape of the finger ends and thus also the shape of the gaps can follow the envelope curve for the gap distances plotted along the transducer length.
- the properties of the converter remain essentially unchanged due to the variations in the gap area. This is achieved by keeping all dimensional changes in the variation of the gaps relatively small compared to the transducer finger length. A completely sufficient effect is achieved if the dimensional change in the variation of the gaps is twice the finger width of a transducer finger. This means that the variation is far below the variations used to weight the converter and thus to shape the transfer function of the converter. On the contrary, with the invention, the admittance of the transducer should remain unchanged and only be reduced by the disturbing excitation, which has nothing to do with the desired excitation. Completely without interaction with the
- the excitation function remains a variation of the gaps, which is only obtained by varying the stub fingers.
- the overlap length of the transducer fingers can be kept unchanged and in particular constant over the transducer length.
- the variation according to the invention in the gap area is not limited to normal finger transducers. It is also possible to vary reflection-free split finger transducers according to the invention. Periodic variations have a period of four gaps because of the doubling of the number of fingers compared to a normal finger converter. A minimum period of two wavelengths for periodic variations is thus achieved, which then leads to a folding of the disruptive excitation function in the gap area, as already explained above.
- transducers according to the invention can be designed as recursive transducers whose reflectivity is set such that the transducer has a preferred direction of wave propagation.
- transducers which preferably allow wave propagation in only one direction one speaks of SPUDT transducers which are also designed according to the invention in such a way that they have a variation in the gap area. Since recursive transducers are characterized by different widths of the electrode fingers and / or spacings of the electrode fingers, uniform variations of the gaps with respect to at least one gap feature are not possible with directional transducers.
- the invention is applicable, since a variation of the gaps is also possible here.
- a transducer according to the invention finds a preferred application in a surface acoustic wave filter, for example is designed as a resonator filter.
- the invention can be used in longitudinal dual mode resonator filters, so-called DMS filters.
- DMS filters so-called DMS filters.
- One-port resonators with transducers according to the invention are preferably used in the serial branch of reactance filters, since the additional conductance of known filters, which is switched off with the invention, has a particularly disruptive effect there.
- a transducer according to the invention can be formed on a piezoelectric film, which in turn is applied to a substrate. Such a film can be produced in thin film processes.
- a converter according to the invention is preferably formed on single-crystalline substrates, for example on the known materials quartz, lithium niobate, lithium tantalate or langasite.
- the invention can, however, also be used on all other piezoelectric substrates in which surface areas can be produced and spread.
- a transducer according to the invention can have a metallization made of a uniform material, in particular aluminum and its alloys. However, it is also possible to construct the converter from several layers, at least some of the individual layers being aluminum, at least
- Main component has.
- the remaining layers can be made of Cu, Mg, Ti, Zr, Sc or other metals.
- the converter becomes more stable if an electrical signal with high power is coupled in and converted into a surface wave.
- a broadband converter can also be obtained and modified according to the invention if it has finger widths and / or finger spacing that change in the transverse direction.
- Such types of converters are also referred to as FAN converters.
- the variation of finger widths and / or finger distances can be linear or hyperbolic, for example.
- transducers can have varying finger widths and / or finger spacings when viewed in the transverse direction, this change being irregular.
- Another transducer according to the invention is constructed as an irregular or non-periodic transducer and is composed, for example, of different cells, each of which differ in terms of finger widths and / or finger spacing.
- Such an irregular transducer is obtained if the excitation function of the transducer is modulated and all degrees of freedom, including finger distances and finger widths, are used for the modulation.
- Figure 1 shows a section of an inventive
- FIG. 2 shows a transducer according to the invention with a further rectangular variation of the transverse gap position
- FIG. 3 shows a transducer with a sinusoidal variation in the transverse gap position
- FIG. 4 shows a converter with a sawtooth-like variation of the transverse gap position
- FIG. 5 shows differently shaped electrode finger ends
- FIG. 6 shows a converter with a combined linear variation of gap position and gap size.
- FIG. 7 specifies several functions for varying one-dimensional gap parameters.
- FIG. 8 compares the input admittance of single-gate resonators with transducers according to the invention with the admittance of single-gate resonators with known transducers.
- FIG. 9 shows the insertion loss of a filter using single-gate resonators with transducers according to the invention.
- Figure 1 shows a simple embodiment of the invention.
- a section of a normal finger converter 1 is shown in the area of a busbar 3.
- This converter has two electrode fingers 2 per wavelength.
- the transducer is varied with respect to the transverse gap position.
- the absolute amount ⁇ D by which the gaps 4 are shifted to a maximum is less than two electrode finger widths, that is, in the case of a normal finger converter, less than a distance which corresponds to half a wavelength at the center frequency.
- FIG. 2 likewise shows a rectangular variation of the transverse gap position in a converter which is shown in sections.
- the gaps are grouped into groups G1, G2, G3, .... to form four gaps, each offset transversely by a small amplitude.
- G1, G2, G3, .... to form four gaps, each offset transversely by a small amplitude.
- there is a convolution of the original excitation in the frequency range which in turn leads to a splitting, with the result that the admittance of the interfering excitation disappears from the stop band range.
- FIG. 3 shows a further embodiment of the invention, in which the transverse position of the gaps 4 is also varied.
- the transverse position of the gaps 4 follows a sine function as the transverse coordinate over the length of the transducer. This variation is also periodic and has a period length of around 12 gaps, for example.
- FIG. 4 shows a further embodiment of the invention with variation of the transverse gap position. Seen over the length of the transducer, the gaps 4 are combined in groups G1, G2, G3, ..., each group Gn having a uniform pattern.
- the pattern here consists of the combination of the gap positions of the gaps 4 belonging to the group in the region of the busbar 3 shown.
- Each group here comprises four gaps corresponding to a period of four wavelengths.
- Each pattern is identical here and has a linear variation in the transverse gap position in the group. Seen across all groups Gn, this results in a sawtooth-shaped variation in the gap position.
- all group patterns are identical and with respect to the transverse arrangement at the same height.
- the electrode finger ends which determine the shape of the gaps, are shown as rectangular, so that a rectangular gap shape also results with the same finger ends.
- FIG. 5 shows an example of five possible shapes of finger ends, the known rectangular shape being shown in FIG. 5a.
- FIGS. 5b and 5c show two forms of finger ends in which the finger ends are cut off at an angle.
- FIG. 5d shows a rounded finger end, while the finger end according to FIG. 5e follows a concave function.
- the finger ends can have any shape.
- FIG. 6 shows a transducer according to the invention, in which the gaps, viewed over the length of the transducer, vary with respect to the gap position, the gap size and the gap shape or the shape of the electrode finger ends.
- the fingers 2a stub fingers
- the fingers 2a connected to the lower busbar 3 have a position of their finger ends which, viewed over the length of the transducer, follows a combined linear function.
- the length of the stub fingers 2a decreases linearly in the direction x. This naturally shifts the position of the finger ends.
- section b the length of the stub fingers 2a increases again linear.
- the position of the ends of the fingers 2b, which are connected to the opposite busbar 5 changes.
- the change in the finger end position is also linear here, so that there is a gap distance increasing linearly in the direction X in section a.
- a linearly decreasing gap distance is realized in section b.
- the shape of the finger ends can be varied so that the contour of the finger ends follows the contour of the envelope for all gaps. However, it is also possible to use finger ends of the same or different shapes for these or other embodiments.
- FIG. 7 shows a number of exemplary functions, for which gap features such as gap position and gap size which can be expressed as one-dimensional variables can be varied.
- the rectangular function according to FIG. 7a corresponds to a variation as has already been shown for the variations of the gap position with the aid of FIGS. 1 and 2. However, such a variation can also be applied to the size of the gaps.
- the functions of FIGS. 7b and 7c correspond to possible variations, as has already been implemented in FIGS. 3 and 4 for the variation of the gap position. Further exemplary functions are shown in FIGS. 7d, 7e and 7f.
- a transducer according to the invention can vary simultaneously with respect to two features according to a periodic function, the selected function being able to be different for each of the gap features.
- the two gap features can also be varied simultaneously with any other combination of functions.
- the same period is preferably used for the simultaneous variation of different features.
- a converter according to the invention preferably also has the same or a similar variation in the area of the second busbar. If the variation of the gaps in the area of the other conductor rail is carried out with the same function, but with a different period or a different phase or with a completely different function, the disturbing conductance of the upper and lower gaps is carried out differently and thus shifted differently.
- the invention can also be used in cascaded one-gate resonators. These include a converter that is divided into sub-converters connected in series. Such a partial transducer comprises at least one electrode finger, but preferably groups of electrode fingers, which are connected to a common, correspondingly long, connecting bus bar that is located transversely in the middle of the transducer.
- the variation according to the invention can also include the gap size and / or the gap position and / or the shape of the finger ends. Particularly when the gap position varies, the connecting busbar can follow the gap position.
- the middle busbar arranged between two connected partial transformers can then be designed with different widths or with steps.
- a converter according to the invention can be used, for example, in single-gate resonators.
- FIG. 8 shows the input admittance of a one-gate resonator with an example according to
- FIG. 1 trained transducer according to the invention.
- the admittance of the resonator with the transducer according to the invention is shown by curve A, while a transducer which is identical in its other dimensions but not provided with the gap variation according to the invention has an input admittance according to curve B.
- the entrance admittance of the known resonator shows an interfering conductance at position S, which acts as a hump in the curve.
- Single-gate resonators with transducers according to the invention show a steeply falling course in this area, which corresponds to an ideal excitation with the desired main mode.
- FIG. 9 shows the transmission behavior of such a reactance filter on the basis of the function S 2 ⁇ - plotted over the wavelength (center frequency).
- curve B corresponds to the transmission behavior of a reactance filter with known single-port resonators
- curve A shows the transmission behavior of a filter that both has a single-gate resonator with a transducer according to the invention in the longitudinal branch and also in the transverse branch.
- the left flank is designed to be significantly steeper, while the bandwidth of the filter is only insignificantly reduced according to curve A.
- the lower insertion loss above the center frequency see arrow on the right
- the transmission curve A is also flatter and shows a lower one
- transducers according to the invention in transversal modes coupled resonator filters (TMR filter).
- TMR filter transversal modes coupled resonator filters
- Such filters have such a high aperture that the acoustic wave can propagate in the form of several transverse modes. Even in such cases, disturbing suggestions occur in the area of the gaps, which can be avoided with the invention.
- the invention is also used for identification marks in surface wave technology. These include a converter according to the invention and at least one reflector. An electrical signal applied to the converter is converted into a surface wave, reflected on the reflector and converted back into an electrical signal in the same converter. The signal, which is generally unchanged after the double conversion, is less affected by disturbing excitations with a converter according to the invention or with a delay line with a converter according to the invention.
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- Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)
Abstract
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Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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JP2003518041A JP4284175B2 (ja) | 2001-07-24 | 2002-05-21 | 障害励振の抑圧を改善した表面波トランスデューサ |
EP02729899A EP1410502A1 (de) | 2001-07-24 | 2002-05-21 | Wandler für oberflächenwellen mit verbesserter unterdrückung störender anregung |
US10/484,708 US7170372B2 (en) | 2001-07-24 | 2002-05-21 | Converter for surface waves with improved suppression of interfering excitation |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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DE10135871A DE10135871B4 (de) | 2001-07-24 | 2001-07-24 | Wandler für Oberflächenwellen mit verbesserter Unterdrückung störender Anregung |
DE10135871.7 | 2001-07-24 |
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WO2003012987A1 true WO2003012987A1 (de) | 2003-02-13 |
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PCT/DE2002/001835 WO2003012987A1 (de) | 2001-07-24 | 2002-05-21 | Wandler für oberflächenwellen mit verbesserter unterdrückung störender anregung |
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US (1) | US7170372B2 (de) |
EP (1) | EP1410502A1 (de) |
JP (1) | JP4284175B2 (de) |
DE (1) | DE10135871B4 (de) |
WO (1) | WO2003012987A1 (de) |
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WO2004079903A1 (de) * | 2003-03-03 | 2004-09-16 | Epcos Ag | Elektroakustischer wandler für mit oberflächenwellen arbeitendes bauelement |
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DE102004020183B4 (de) | 2004-04-22 | 2015-12-03 | Epcos Ag | Oberflächenwellen-Resonatorfilter mit longitudinal gekoppelten Wandlern |
US8106726B2 (en) * | 2005-01-21 | 2012-01-31 | National University Corporation Chiba University | Elastic surface wave device comprising dummy electrodes |
CN101116244B (zh) * | 2005-04-08 | 2010-08-25 | 株式会社村田制作所 | 弹性波元件 |
DE102005029249A1 (de) * | 2005-06-23 | 2006-12-28 | Epcos Ag | SAW-Struktur mit Stummelfingern |
JP4727322B2 (ja) * | 2005-07-06 | 2011-07-20 | 太陽誘電株式会社 | 弾性表面波装置 |
JP2007060108A (ja) * | 2005-08-23 | 2007-03-08 | Fujitsu Media Device Kk | 弾性表面波装置 |
DE102005051852B4 (de) * | 2005-10-28 | 2021-05-20 | Snaptrack, Inc. | SAW Filter mit breitbandiger Bandsperre |
JPWO2007108269A1 (ja) * | 2006-03-17 | 2009-08-06 | 株式会社村田製作所 | 弾性波共振子 |
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- 2002-05-21 WO PCT/DE2002/001835 patent/WO2003012987A1/de active Application Filing
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US7449812B2 (en) | 2003-03-03 | 2008-11-11 | Epcos Ag | Electroacoustic transducer for a surface wave operating component |
Also Published As
Publication number | Publication date |
---|---|
US20040247153A1 (en) | 2004-12-09 |
US7170372B2 (en) | 2007-01-30 |
JP2004537235A (ja) | 2004-12-09 |
JP4284175B2 (ja) | 2009-06-24 |
DE10135871A1 (de) | 2003-02-06 |
EP1410502A1 (de) | 2004-04-21 |
DE10135871B4 (de) | 2012-10-25 |
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