WO2012084461A1 - Composant de filtrage - Google Patents

Composant de filtrage Download PDF

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Publication number
WO2012084461A1
WO2012084461A1 PCT/EP2011/071657 EP2011071657W WO2012084461A1 WO 2012084461 A1 WO2012084461 A1 WO 2012084461A1 EP 2011071657 W EP2011071657 W EP 2011071657W WO 2012084461 A1 WO2012084461 A1 WO 2012084461A1
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WO
WIPO (PCT)
Prior art keywords
filter
component according
passband
filters
input
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.)
Ceased
Application number
PCT/EP2011/071657
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German (de)
English (en)
Inventor
Andreas Detlefsen
Franz Kubat
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TDK Electronics AG
Original Assignee
Epcos AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Epcos AG filed Critical Epcos AG
Priority to CN201180061779.2A priority Critical patent/CN103262411B/zh
Publication of WO2012084461A1 publication Critical patent/WO2012084461A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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 elements; 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
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/46—Networks for connecting several sources or loads, working on different frequencies or frequency bands, to a common load or source

Definitions

  • the invention relates to a (ultra-) wideband Filterbau ⁇ element, in which a plurality of frequency filters are interconnected in a housing of the filter device.
  • Filter components in which the filter property is effected by converting an electrical signal into an acoustic wave are essentially configured as surface wave (SAW) filters or bulk wave (BAW) filters.
  • SAW surface wave
  • BAW bulk wave
  • a metallic structure to which a voltage is applied, is arranged on a carrier substrate.
  • the metallic structure acts as an input wall ⁇ ler. Due to the coupling between the carrier substrate and the metallic structure of the input transducer, when a voltage is applied to the metallic structure along the surface of the carrier substrate, an acoustic wave is generated.
  • the acoustic wave is connected to another metallic
  • acoustic wave filters which are angeord ⁇ net on the surface of the carrier substrate and acts as output transducer, converted back into an electrical signal.
  • the maximum bandwidth of acoustic wave filters is essentially determined by the coupling property of the carrier substrate. With a lithium tantalate support substrate, such as LiTaO 3, the relative bandwidth of the filter is limited to approximately 4% with respect to the center frequency of the filter. It is possible to use acoustic filters which have a substrate of lithium niobate which has a larger coupling factor than lithium tantalate realize larger bandwidths, but the edges of such filters have a lower edge steepness.
  • a filter device comprises an input terminal for applying a signal, an output terminal for outputting the signal, a first filter having an input side and an output side, and a second filter having an input side and having a first filter
  • the first and second filters are each connected between the input terminal and the output terminal.
  • the first filter in a frequency spectrum has a first passband and the second filter in the first
  • Frequency spectrum has a second passband.
  • the first and the second filter are designed such that the first passband and the second passband overlap at least in regions.
  • a first diplex network is connected between the input side of the first filter and the input side of the second filter.
  • a second diplex network is connected between the output side of the first filter and the output side of the second filter.
  • the filter component has a significantly greater bandwidth than the respective individual first and second filters.
  • Ent ⁇ speaking of the band-forming properties of the individual filters, in particular according to the bandwidth and the flank steepness of the single filter is determined by the interconnection of an (ultra) broadband and / or a particularly high-slope filter with low insertion loss, for example, an insertion loss not exceeding 3 dB, and with a continuous defined passband.
  • the filter device has, for example, fluctuations (ripples) of less than 2 dB.
  • FIG. 1 shows a disclosed embodiment of a filter device with two integ in a housing of the filter device ⁇ -configured filters
  • Figure 2 is a disclosed embodiment, a filter of the Filterbau ⁇ elements
  • FIG. 3A shows transfer functions of individual filters of the filter component
  • FIG. 3B shows a resulting transfer function of the filter component
  • FIG. 4 shows an embodiment of an internal interconnection of FIG
  • FIG. 5 shows a further embodiment of an inner interconnection of individual filters of the filter component
  • FIG. 6A shows a further embodiment of an internal interconnection of individual filters of the filter component
  • FIG. 6B shows a further embodiment of an internal connection of individual filters of the filter component
  • FIG. 7A shows a further embodiment of an internal connection of individual filters of the filter component
  • FIG. 7B shows a further embodiment of an internal connection of individual filters of the filter component
  • FIG. 8A shows an embodiment of a diplex network of the filter component
  • FIG. 8B shows a further embodiment of a diplex network of the filter component
  • FIG. 8C shows a further embodiment of a diplex network of the filter component
  • FIG. 8D shows a further embodiment of the diplex network of the filter component
  • Figure 8E is a further disclosed embodiment of the Diplexnetzwerks of the filter device
  • Figure 9A is a disclosed embodiment of a Diplexnetzwerks and ei ⁇ nes filter of the filter device
  • FIG. 9B shows a further embodiment of the diplex network and the filter of a filter component
  • FIG. 10 shows a further embodiment of a diplex network and a filter of the filter component.
  • 1 shows a disclosed embodiment of a filter device 100 having an input terminal for applying an E100 Sig ⁇ Nals and an output terminal for outputting the A100 Sig ⁇ Nals.
  • the filter component has a housing 70, in which two individual filters 10 and 20 are arranged.
  • the individual filters are each designed such that they have a filter function as a transfer function.
  • the filter function can correspond to, for example, a transfer function of Bandpassfil ⁇ ters with a stop band and a passband. In the passband, the filter has a much lower insertion loss than the stopband. In the transition region between passband and stopband, the filter has a left and a right side flank.
  • FIG. 2 shows a possible disclosed embodiment for the single filter ⁇ 10 and 20.
  • the filter can be configured for example as a DMS (dual-mode surface acoustic wave) -Oberfestwellenfilter.
  • the filter 10 has an input terminal E10 for applying a signal.
  • the DMS track has transducer structures 1, 2 and 3.
  • the input terminal E10 is connected to the transducer structure 1 and the transducer structure 3.
  • the transducers 1 and 3 are formed as input transducers of the strain gauge track are further connected to a terminal for applying a reference potential M ⁇ connected.
  • An output transducer 2 is connected between the two input transducers 1 and 3.
  • the output transducer has an output terminal A10 for outputting a signal.
  • Another terminal of the output transducer is connected to a terminal for applying a reference potential.
  • the reference potential may be, for example, a ground potential.
  • the transducer structures 1, 2 and 3 are arranged between reflectors 4 and 5.
  • the transducers may have a comb-like metallic structure which is arranged on a carrier substrate 6.
  • the carrier substrate may, for example, contain a material of lithium niobate, lithium tantalate or quartz.
  • the individual filters 10 and 20 shown in Figure 1 can each have the ge in Figure 2 ⁇ showed structure in egg nem simple embodiment.
  • the single filters can also contain much more complex filter structures.
  • the individual filters 10 and 20 each have a characteristic filter About ⁇ tragungsfunktion.
  • Figure 3A shows respective transfer functions of the filters 10 and 20, wherein an insertion loss IL is plotted against a frequency F.
  • the filter 10 for example, has a center frequency of approximately ⁇ With 1960 MHz.
  • the filter 20 is disposed above the filter 10 and has a center frequency of about 2040 MHz.
  • filter 10 may have the characteristics of a steep right edge transmit filter
  • filter 20 may have the characteristics of, for example, a steep left edge receive filter.
  • the individual filters 10 and 20 of the filter component 100 are designed such that the respective passage region of the filter overlaps.
  • the right flank of the filter 10 overlaps the left flank of the filter 20.
  • the two filter plots are shifted relative to each other such that the right flank of the filter 10 overlaps the left flank of the filter 20 when the insertion loss of the filter 10 overlaps Filters 20 to less than 10 dB. has fallen.
  • the left flank of the Fil ⁇ ters 20 overlaps the filter 10 in an area that is in the de-energized the right flank of the filter 10 to less than 10 dB relative to the passband of the filter 10, in particular to the minimum insertion loss in the passband of the filter 10, ,
  • the filter 10 has a left flank that is steeper than the right flank of the filter.
  • the filter 20 preferably has a right flank which is steeper than its left flank.
  • FIG. 3B shows the resulting filter transfer function of the filter device 100 between the input terminal E100 and the output terminal A100. Shown is the filter ⁇ transfer function in the form of the scattering parameter S21, which is measurable between the input terminal E100 and the output terminal A100, for example by means of a network analyzer.
  • the resulting filter transfer function has a relative bandwidth of approximately 8% with respect to the center frequency of now about 2000 MHz.
  • the filter element can be optimized with regard to the impedance at the input and output as well as with respect to the phase position of both filters 10 and 20 at the inputs and outputs.
  • FIG. 3B clearly shows that, in comparison to a single filter on the same carrier substrate, a filter component can be realized by interconnecting two individual filters with a significantly greater bandwidth than the two individual filters .
  • essential filter properties such as edge steepness and specific temperature behavior remain unchanged.
  • the greatest bandwidth is achieved if the filter structures of the individual filters 10 and 20 a carrier substrate with high coupling, for example, a carrier substrate of lithium niobate, are applied.
  • FIG. 4 shows an embodiment of an inner interconnection of the filter component.
  • the filter device has a filter 10 and a filter 20.
  • the filters 10 and 20 are formed such that their transfer function in each case shows the cha ⁇ acteristic response of a band pass filter.
  • the transmission function in particular the function of the scattering parameter S21, the filter has a passband and a stopband, wherein the insertion loss in the passband is lower than in the stopband. In the transition region between the passband and the stopband, the two filters each have flanks.
  • the transfer function of the filter 10 and the transfer function of the filter 20 may correspond, for example, to the filter transfer functions shown in FIG. 3A.
  • the filter 10 is connected in a signal path SP1 between the input input terminal and the output terminal E100 A100 Fil ⁇ terbauelements.
  • the filter 20 is connected in a signal ⁇ path SP2 between the input terminal E100 and the output ⁇ outlet A100 of the filter device.
  • the two signal paths SP1 and SP2 are thus connected in parallel between the input and output terminals of the filter component .
  • the filter 10 has an input side E10 for applying a signal and an output side A10 for outputting a signal.
  • the filter 20 has an input side E20
  • the input side E10 for applying a signal is connected via an adaptation circuit 30 to the input End E100 of the filter device connected.
  • the output ⁇ page A10 for outputting a signal from the filter 10 is connected via a further matching circuit 40 to the output terminals of the circuit A100 filter device.
  • the input side E20 for applying a signal to the filter 20 is connected directly to the input terminal E100 of the Filterbauele ⁇ ment.
  • the output side A20 of the filter 20 for outputting a signal is directly connected to the output terminal A100 of the filter device.
  • the matching circuits 30 and 40 may be formed, for example, each as a diplex network.
  • the diplex networks 30 and 40 are each designed such that the filter 10 has high-impedance properties at a frequency in the passband of the filter 20, for example in the passband D2 shown in FIG. 3A.
  • the filter 10 may be at higher impedance than at a frequency in the blocking region S2 of the filter 20 at ⁇ example, at a frequency in the passband D2 of the filter 20.
  • the Diplexnetzwerke can be 30 and 40 so formed from ⁇ that the filter 20 has, at a frequency in the passband of the filter 10 Dl, for example, in the example shown in Figure 3A passband Dl, high-impedance properties.
  • the filter 20 may, for example, for frequencies in the passband 1 of the filter 10 higher impedance than for frequencies in the stopband Sl of the filter 10, for example, in the blocking region Sl shown in Figure 3A, be formed.
  • the diplex networks 30 and 40 can be designed to adapt the phase of the filters 10 and 20 in such a way that the filter 10 in the frequency range of the passband of the filter 20 has high-impedance properties and the filter ter 20 in the frequency range of the passband of the filter 10 also has high impedance properties.
  • the Diplexnetzwerk 30 is guide in the form shown in Figure 4 to off configured to cause a phase change of the Sig ⁇ Nals between the input terminal of E100 Filterbauele ⁇ ment and the input side of the filter E10 10th
  • the Diplexnetztechnik 40 is adapted to cause a Phasenände ⁇ tion of the signal between the output side A10 of the filter 10 and the output terminal of the filter device A100.
  • a filter transfer function with a filter transfer function substantially greater than that of the filter transfer functions of the individual filters 10 and 20 can be established between the input terminal E100 and the output terminal A100 of the filter component Realize bandwidth. While remaining WE sentliche filter characteristics of the individual filter structures 10 and 20, for example, the slope and the specifi ⁇ specific temperature behavior unchanged. If the filter 10 has a passband that is at a lower frequency than the passband of the filter 20, the left flank of the filter 10 and the right flank of the filter 10 remain
  • FIGS. 5, 6A, 6B, 7A and 7B show further possibilities for the internal connection of the filters 10 and 20 of the filter component 100, with which a bandwidth which is significantly increased in comparison to the individual filters can be achieved, whereby further ones are achieved Characteristic filter properties, such as the edge part ⁇ unit and the specific temperature behavior, the Einzelfil ⁇ ter 10 and 20 remain virtually unchanged.
  • Figure 5 shows a further disclosed embodiment, the inner inter- connection of the filter device 100.
  • the single filter 10 is in a signal path SP1 between the input terminal and the output terminal E100 A100 of filter device maral ⁇ tet.
  • the filter 20 is in the signal path SP2 between the input terminal E100 and the output terminal A100 of FIG
  • the two individual filters 10 and 20 are thus connected in parallel between the input and réellean ⁇ circuit of the filter component.
  • the input side E10 of the filter 10 is connected via the matching circuit 30, for example a diplex network, to the input terminal
  • the output side A10 of the filter 10 is directly connected to the output terminal A100 of the filter device.
  • the input side E20 of the filter 20 is directly connected to the input terminal E100 of the filter device.
  • the output side of the A20 Fil ⁇ ters 20 is connected via the matching circuit 40, for example a Diplexnetzwerk, connected to the output terminal of the A100 Filterbau ⁇ elements.
  • the diplex network 30 is designed such that the impedance in the path SP1 is high-impedance at frequencies in the passband of the filter 20. For example, the impedance of Sig ⁇ nalpfades SP1 for frequencies in the passband of the filter 20 are higher impedance than for frequencies in the stopband of the filter 20.
  • the diplex network 40 is designed to ⁇ that the impedance in the signal path SP2 at Signalfre ⁇ frequencies in the passband of the filter 10 is high impedance.
  • the impedance in the signal path SP2 for Sig- nalfrequenzen be in the passband of the filter 10 higher impedance than for signal frequencies in the stopband of the filter 10.
  • the diplex network 30 may be designed, for example, such that for signals at frequencies in the passband of the filter 20, the signal path SP1 or the filter 10 acts as idle. Accordingly, the diplex network 40 may be designed so that, for signal frequencies in the passband of the filter 10, the signal path SP2 or the filter 20 acts as an idling.
  • the diplex network 30 is designed to effect a phase change of the signal between the input terminal E100 of the filter component and the input side E10 of the filter 10.
  • the Diplexnetzwerk 40 is adapted to cause a phase change of the signal Zvi ⁇ rule A20 of the output side of the filter 20 and the output terminal of the filter device A100.
  • the individual filters 10 and 20 each have an unbalanced input and output side (unbalanced / unbalanced, single ended / single ended).
  • the filter 10 has an unbalanced input side (unbalanced) and a balanced output side (balanced).
  • the individual filter structures 10 and 20 are connected in parallel in the signal paths SP1 and SP2 between the input terminal E100 and the output terminal A100 of the filter component.
  • the input terminal E10 of the filter 10 is connected via the matching ⁇ circuit 30, for example, a diplex network, with the input terminal E100 of the filter device. From- The input side A10 of the filter 10 is connected via the matching circuit 40, for example a diplex network, to the output terminal AlOO of the filter component. Due to the symmetrical outputs, the filter 10 has a further output side A10 ', which is connected via an adaptation circuit 50 to the output terminal AlOO of the filter component.
  • the input side E20 of the filter 20 is directly connected to the input terminal E100 of the filter device.
  • the output side A20 of the filter 20 is also directly connected to the output terminal AlOO of the filter device.
  • Figure 6B shows a further disclosed embodiment of the Filterbau ⁇ elements
  • the output port is in contrast to that shown in Figure 6A disclosed embodiment, symmetrically formed in the.
  • the filter device therefore has an output terminal A100 and an output terminal A100 '.
  • the filter 20 is designed to be asymmetrical on the input side and symmetrically on the output side.
  • the filter 20 therefore has an output side A20 and a further output side A20 '.
  • the output side A10 of the filter 10 and the output side A20 of the filter 20 are connected to the output terminal A100.
  • the further from ⁇ aisle A10 ', A20' of the filters 10, 20 are connected to the
  • the diplex network 40 is connected between the output side A10 of the filter 10 and the output side A20 of the filter 20.
  • the diplex network 50 is connected between the further output side A10 'of the filter 10 and the further output side A20' of the filter 20.
  • the Diplexnetzwerke 30, 40 and 50 are formed similar to that shown in Fi gur 1 ⁇ disclosed embodiment, to 10 and 20 to adjust the phase of the individual filters to one another, so that the Filter 20 in the frequency range of the passband of the filter 10 has high impedance properties. Furthermore, the diplex networks 30, 40 and 50 are designed such that the filter 10 has high-impedance properties at frequencies in the passband of the filter 20. In particular, the matching circuits 30, 40 and 50 can be designed such that the filter 20 has a higher impedance for frequencies in the passband of the filter 10 than for frequencies in the stopband of the filter 10 and that the filter 10 for frequencies in the passband of the filter 20 higher impedance than for frequencies in the stopband of the filter 20.
  • FIG. 7A shows a further embodiment for the internal connection of the filters 10 and 20 of the filter component 100.
  • the filter 10 is designed as a single filter with a symmetrical input side (balanced / balanced) and one SYMMETRI ⁇ rule output side (balanced / balanced) formed.
  • the filter 10 therefore has a further input side to E10 'which is connected through a matching circuit 60, for example a Diplexnetzwerk E100 to the input terminal of the filter device.
  • Figure 7B shows another disclosed embodiment of the Filerbauele- ment, in which, in contrast to that shown in Figure 7A disclosed embodiment, the filter device on the input side symmet ⁇ driven with an input terminal of E100 and another input terminal E100 'as the output side, symmetrically to an output terminal A100 and a further output terminal A100 'is formed.
  • the filter 10 has a ⁇ A input side and another input side E10 E10 'and an output side of A10 and A10, another output side' on.
  • the filter 20 has an input side E20 and a another input side E20 'and an output side A20 and another output side A20' on.
  • a Diplexnetztechnik 30 is connected to the input terminal of the filter device E100 Bezie ⁇ hung, between the input side of the filter 10 E10 and E20, the input side of the filter 20th
  • a Diplexnetztechnik 40 is connected between the output side A10 of the filter 10 and the output side of the A20 Fil ⁇ ters 20 and the output terminal of the A100 FIL terbauelements.
  • a Diplexnetztechnik 50 is connected between the further output page A10 'of the filter 10 and the further output side A20' of the filter 20 or the wide ⁇ ren output terminal A100 'of the filter device.
  • a diplex network 60 is connected between the further input side E10 'of the filter 10 and the further input side E20' of the filter 20 or the further input connection E100 'of the filter component.
  • the diplex networks 30, 40, 50 and 60 are designed to adapt the phase of the filters to one another such that the filter 20 has high-impedance properties at signal frequencies in the passband of the filter 10 and vice versa the filter 10 at signal frequencies in the passband of the filter 20 in turn has a high impedance.
  • the filter 20 has high-impedance properties at signal frequencies in the passband of the filter 10 and vice versa the filter 10 at signal frequencies in the passband of the filter 20 in turn has a high impedance.
  • the filter 20 can have higher-impedance intrinsic properties than for signals in the stopband of the filter 10.
  • the diplex networks for example, can also be configured here in such a way that the signal path SP1 for signals in the passband of the filter 20 is almost an open circuit. and the signal path SP2 for signal frequencies in the passband of the filter 10 almost acts as idle.
  • At least one matching network or diplex network is connected between the input side E10, E10 'of the filter 10 and the input side E20 of the filter 20.
  • At least one additional matching rela ⁇ hung as another Diplexnetztechnik is connected between the output side of A10, A10 'A20 and the output side of the filter 20th
  • the filter 10 is designed as a filter with unbalanced / balanced sides (unbalanced / balanced) or in the input side and output side in a symmetrical state (balanced / balanced).
  • the filter 20 can also be designed asymmetrically on one side and symmetrically (unbalanced / balanced) on the other side or symmetrically on the input side and balanced on the output side (balanced / balanced).
  • the diplex networks connected in front of and behind the filter 10 in FIGS. 6A and 7A can also be connected in front of and behind the filter 20.
  • Figures 8A, 8B, 8C, 8D and 8E show possible embodiments of the diplex networks 30, 40, 50 and 60.
  • Diplexnetzwerke are essentially adapted to cause Zvi ⁇ rule its input and output a phase rotation signal egg nes.
  • Figure 8A In the illustrated in Figure 8A
  • FIGS. 8B and 8C show T-connections of coils L and capacitors C, respectively 8B, two capacitors C are connected in series between an input and output of the diplex network, and a coil L is connected to a reference voltage terminal.
  • two coils L are connected in series between the input and output of the diplex network, a capacitor C being connected to a reference voltage connection between the coils.
  • Figures 8D and 8E show n interconnections of coils L and capacitors C. In the embodiment shown in Figure 8D, a capacitor C is connected between an input terminal and an output terminal of the diplex network.
  • Coils L are each Zvi ⁇ rule the input terminal and a reference voltage terminal respectively connected between the output terminal and a reference voltage terminal.
  • a capacitor C is connected between the input terminal and a reference voltage terminal and a further capacitor C is connected between the output terminal and a reference voltage ⁇ connection.
  • the reference voltage may be, for example, a ground potential.
  • FIG. 9A shows an embodiment in which the matching circuit formed as a diplex network is shown as a T
  • the diplex network can be connected, for example, to the input terminal E10 of the filter 10.
  • the on ⁇ matching network can be simplified by using less than three discrete elements shown in Figure 9A may be provided.
  • the matching network 30 has, for example, only one capacitor C and one coil L.
  • the discrete elements can be partially integrated into the chip of the downstream filter.
  • the passive individual ⁇ elements can also in a housing of the filter device, for example, in a low-temperature Einbrandgephase
  • FIG. 10 shows a further embodiment in which the matching network has a discrete element, for example a coil L, which is connected in each case in front of and behind the filter component.
  • the matching network can also have capacitors, which can be integrated, for example, on the acoustic chip of the filter component.
  • a matching network in particular ⁇ sondere a Diplexnetzwerk, can be a filter device having an overall transfer function realized Sieren that a has significantly greater bandwidth than the band ⁇ wide of the respective individual filter.
  • On a carrier substrate made of lithium is ei ⁇ ne relative bandwidth can be achieved, for example, which is significantly higher than 4%.
  • the filter component may be designed such that the overall transfer function has a particularly steep left or a particularly steep right flank. It is also possible to realize transfer functions with two particularly steep edges.

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  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Filters And Equalizers (AREA)
  • Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)

Abstract

Le composant de filtrage (100) selon l'invention comprend un premier filtre (10) et un second filtre (20) qui sont chacun connectés entre une borne d'entrée (E100) et une borne de sortie (A100) du composant de filtrage. Le premier et le deuxième filtre (10, 20) sont conçus de telle sorte que la bande passante (D1) du premier filtre (10) et la bande passante (D2) du second filtre (20) se chevauchent au moins par endroits. Un réseau diplex (30, 40) est connecté respectivement entre le côté d'entrée (E10) du premier filtre et le côté d'entrée (E20) du second filtre (20) et entre le côté de sortie (A10) du premier filtre et le côté de sortie (A20) du second filtre (20).
PCT/EP2011/071657 2010-12-22 2011-12-02 Composant de filtrage Ceased WO2012084461A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201180061779.2A CN103262411B (zh) 2010-12-22 2011-12-02 滤波器件

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010055648.3A DE102010055648B4 (de) 2010-12-22 2010-12-22 Filterbauelement
DE102010055648.3 2010-12-22

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WO2012084461A1 true WO2012084461A1 (fr) 2012-06-28

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CN107248852A (zh) * 2015-06-03 2017-10-13 威盛日本株式会社 声波装置
WO2020114849A1 (fr) * 2018-12-05 2020-06-11 RF360 Europe GmbH Filtre micro-acoustique en demi-treillis du type à découpage de bande utilisant un déphaseur et comportant une large bande passante

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CN105680821A (zh) * 2015-12-25 2016-06-15 北京长峰微电科技有限公司 一种高频高功率窄带低损耗滤波器
DE102016106185A1 (de) * 2016-04-05 2017-10-05 Snaptrack, Inc. Breitbandiges SAW-Filter

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