CN103262411B - Filter component - Google Patents
Filter component Download PDFInfo
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- CN103262411B CN103262411B CN201180061779.2A CN201180061779A CN103262411B CN 103262411 B CN103262411 B CN 103262411B CN 201180061779 A CN201180061779 A CN 201180061779A CN 103262411 B CN103262411 B CN 103262411B
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- wave filter
- filtering device
- filter
- free transmission
- transmission range
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic 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
-
- 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
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- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Filters And Equalizers (AREA)
- Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)
Abstract
A filter component (100) comprises a first filter (10) and a second filter (20) which are respectively connected between an input connection (E100) and an output connection (A100) of the filter component. The first and second filters (10, 20) are designed in such a way that the pass-band (D1) of the first filter (10) and the pass-band (D2) of the second filter (20) overlap one another at least regionally. A synthetic diplex network (30, 40) is connected between the input side (E10) of the first filter and the input side (E20) of the second filter (20), and between the output side (A10) of the first filter and the output side (A20) of the second filter (20).
Description
Technical field
The present invention relates to a kind of（It is super）Wideband filtered device, plurality of frequency filter in the housing of filtering device that
This wiring.
Background technology
The filtering device that filtering characteristic is realized by converting the electrical signal to acoustical signal is basically constructed as surface wave
（SAW）Wave filter or volume ripple（BAW）Wave filter.It is disposed above in carrier substrates in the case of SAWF
The metal structure of applied voltage.The metal structure serves as input converter.Because the metal of carrier substrates and input converter is tied
Coupling between structure, the surface when applying a voltage in metal structure along carrier substrates produces sound wave.The sound wave is in cloth
Put on the surface of carrier substrates and serve as and be again converted to electric signal at another metal structure of output translator.
The maximum bandwidth of the wave filter worked with sound wave determines basically by the coupled characteristic of carrier substrates.By tantalum
Sour lithium, such as LiTaO3In the case of the carrier substrates of composition, the relative bandwidth relative to filter IF of wave filter is limited
To about 4%.It is this although larger bandwidth can be realized using the acoustic filter with the substrate being made up of lithium niobate
The edge of wave filter has less edge steepness, wherein the lithium niobate has the coupling factor bigger than lithium tantalate.
The content of the invention
Desirably a kind of filtering device is illustrated, the filtering device has big bandwidth and additionally also has high side
Along steepness.
According to an embodiment, filtering device is included for applying the input wires terminal of signal, for output signal
Output wiring terminal, with it is asymmetric input and outlet side the first wave filter and with it is asymmetric input and it is defeated
Go out the second wave filter of side.Also include housing, first wave filter and the second wave filter are disposed in identical in the housing
In carrier substrates, the first and second wave filters are connected to the signal path between input wires terminal and output wiring terminal
In, two of which signal path is connected in parallel between the input wires terminal and the output wiring terminal.First wave filter exists
There is the first free transmission range in frequency spectrum and the second wave filter has the second free transmission range in frequency spectrum, wherein the first free transmission range
Each other at least local overlaps with the second free transmission range so that the right edge of the first wave filter is with the second wave filter in following scope
Overlap：The left margin landing of the second wave filter in this range is less than 10dB, and the left margin of the second wave filter and the first filter
Ripple device is overlapped in following scope：In this range the right of the first wave filter is less than 10dB, and first filter along landing
The left margin of ripple device is steeper than its right edge, and the right of second wave filter is along steeper than its left margin.It is configured to
The first diplex network connection with circuit is between the input side of the first wave filter and the input side of the second wave filter.By structure
Make the second diplex network connection for match circuit the first wave filter outlet side and the second wave filter outlet side it
Between.
Filtering device has the bandwidth more significantly larger than corresponding the first and second single wave filters.According to single filtering
The characteristic that the band of device is provided, especially in accordance with the bandwidth and edge steepness of single filter, is defined with undershoot by wiring
Enter loss（Einfügedämpfung）, such as highest 3dB insertion loss and with continuous free transmission range（It is super）Broadband
And/or the wave filter that edge is especially steep.In free transmission range, filtering device for example has the fluctuation less than 2dB（Ripple）.
Have at least one in addition according at least one of the improvement of filtering device of the present invention, first and second wave filters
Outlet side, it is another in the other outlet side and wave filter of in the wave filter of the 3rd diplex network connection
Between the outlet side of.At least one of first and second wave filters are with least one other input side, and the 4th is same
Between another input side in the other input side and wave filter of be connected in from wave filter to duplex network.The
One and second wave filter outlet side be configured to it is symmetrical and respectively have other outlet side, the 3rd diplex network connect
It is connected between the other outlet side of the first wave filter and the other outlet side of the second wave filter.First and second wave filters exist
Input side is configured to symmetrical and has other input side respectively, and the 4th diplex network connection is in the first wave filter
Between other input side and the other input side of the second wave filter.Diplex net structure is so that the first wave filter
It is configured to more increase ohm at frequency of the ratio in the stopband range of the second wave filter at the frequency in the second free transmission range, and
And second wave filter be configured at the frequency in the first free transmission range at frequency of the ratio in the stopband range of the second wave filter
More increase ohm.Diplex net structure is so that at the frequency in the first free transmission range, with the second wave filter and
The signal path of the corresponding diplex network at the input side and outlet side of two wave filters has an impedance of high ohm, and
It is corresponding at the input side and outlet side of the first wave filter in the same direction with the first wave filter at frequency in second free transmission range
The signal path of duplex network has the impedance of high ohm.At least one of diplex network is configured to cause wave filter
The phase change of the signal between the input wires terminal of part and the input side of the first wave filter.In diplex network at least
The phase place of the signal between one output wiring terminal for being configured to cause filtering device and the outlet side of the second wave filter changes
Become.Diplex network includes respectively passive element.The passive element be the π shapes wiring of coil, capacitor and/or circuit or
T-shaped wiring.The element of diplex network is at least partly integrated in the first wave filter and/or the second wave filter.First He
Second wave filter has respectively metal structure, and the metal structure is arranged on substrate, the element at least portion of diplex network
Divide it is integrated in the substrate.The element of diplex network is at least partially integrated in the housing of filtering device.The housing
It is low temperature calcination housing.First and second wave filters are configured to so that the first free transmission range is in lower than the second free transmission range
In frequency range.First wave filter is constructed so that the first free transmission range has the steeper left side in the right edge than the first free transmission range
Edge, the second wave filter is constructed so that the second free transmission range has the right edge steeper than the left margin of the second free transmission range.
First wave filter and the second wave filter are respectively configured to acoustic filter.The acoustic filter is SAWF, critical
Wave filter or volume wave filter.The filtering device has the 3rd free transmission range, and the 3rd free transmission range is extended through
First free transmission range and the second free transmission range, wherein insertion loss of the filtering device in the 3rd free transmission range are with less than 5dB ripples
It is dynamic.3rd free transmission range has the relative bandwidth more than 4%.Filtering device in the 3rd free transmission range in input wires terminal or
There is the little change in terms of the absolute value of nominal impedance at output wiring terminal.First and second wave filters have respectively band resistance
Frequency characteristic.First wave filter can be tunable optic filter.
Description of the drawings
The present invention is expanded on further below according to the accompanying drawing for illustrating the embodiment of the present invention.Wherein：
Fig. 1 illustrates the embodiment of the filtering device of the wave filter being integrated in two in the housing of filtering device,
Fig. 2 illustrates the embodiment of the wave filter of filtering device,
Fig. 3 A illustrate the transfer function of the single filter of filtering device,
Fig. 3 B illustrate the transfer function that the result of ripple rate device is obtained,
Fig. 4 illustrates the embodiment of the back panel wiring of the single filter of filtering device,
Fig. 5 illustrates another embodiment of the back panel wiring of the single filter of filtering device,
Fig. 6 A illustrate another embodiment of the back panel wiring of the single filter of filtering device,
Fig. 6 B illustrate another embodiment of the back panel wiring of the single filter of filtering device,
Fig. 7 A illustrate another embodiment of the back panel wiring of the single filter of filtering device,
Fig. 7 B illustrate another embodiment of the back panel wiring of the single filter of filtering device,
Fig. 8 A illustrate the embodiment of the diplex network of filtering device,
Fig. 8 B illustrate another embodiment of the diplex network of filtering device,
Fig. 8 C illustrate another embodiment of the diplex network of filtering device,
Fig. 8 D illustrate another embodiment of the diplex network of filtering device,
Fig. 8 E illustrate another embodiment of the diplex network of filtering device,
Fig. 9 A illustrate the diplex network of filtering device and the embodiment of wave filter,
Fig. 9 B illustrate the diplex network of filtering device and another embodiment of wave filter,
Figure 10 illustrates the diplex network of filtering device and another embodiment of wave filter.
Specific embodiment
Fig. 1 illustrates the input wires terminal E100 and the output wiring terminal for output signal having for applying signal
The embodiment of the filtering device 100 of A100.The filtering device has housing 70, and two single filters are arranged in the housing
10 and 20.The single filter is respectively configured to so that they have filter function as transfer function.Filter function
For example can correspond to the transfer function of the bandpass filter with stopband range and free transmission range.Compared with stopband range,
Bandpass range median filter has significantly lower insertion loss.In transition range between free transmission range and stopband range,
Wave filter has respectively left margin and the right edge.
Fig. 2 illustrates the possible embodiment of single filter 10 and 20.In the embodiment of fig. 2, wave filter for example can be with
It is embodied as DMS（Dual-Mode-Surface Acoustic Wave, dual mode surface acoustic wave）SAWF.Institute in fig. 2
In the case of showing the example of embodiment, wave filter 10 has the input wires terminal E10 for applying signal.DMS tracks
（DMS-Spur）With converter structure 1,2 and 3.Input wires terminal E10 is connected with converter structure 1 and converter structure 3.
Converter 1 and 3 is configured to the input converter of DMS tracks and the binding post for being moreover connected to for applying reference potential M
Place.
Output translator 2 is connected between two input converters 1 and 3.The output translator has is used for output signal
Output wiring terminal A10.Another binding post of output translator is connected with the binding post for being used to apply reference potential.Should
Reference potential for example can be earth potential.
Converter structure 1,2 and 3 is arranged between reflector 4 and 5.Converter can in the case of SAWF example
Such as there is the metal structure of pectination, the structure is arranged in carrier substrates 6.The carrier substrates for example can include by lithium niobate,
The material that lithium tantalate or quartz are constituted.
Single filter 10 and 20 shown in Fig. 1 can have respectively in a simple embodiment shown in Fig. 2
Structure.Single filter can also include substantially more complicated filter construction.Single filter 10 and 20 has respectively spy
The filter transfer function of levying property.
Fig. 3 A illustrate the respective transfer function of wave filter 10 and 20, and wherein insertion loss IL is drawn with regard to frequency F.Filter
Ripple device 10 for example has the substantially intermediate frequency of 1960MHz.Wave filter 20 is arranged on wave filter 10 and with about 2040MHz
Intermediate frequency.Wave filter 10 can for example have the characteristic of the transmitting filter with precipitous the right edge, and wave filter 20 is for example
There can be the characteristic of the receiving filter with precipitous left margin.
The single filter 10 and 20 of filtering device 100 is configured to so that the respective free transmission range of wave filter is each other
Overlap.In figure 3 a in the case of shown embodiment, the right edge of wave filter 10 overlaps each other with the left margin of wave filter 20.
Two filter curve is mutually moved to so that the wave filter 10 when the insertion loss of wave filter 20 is dropped to less than 10dB
The right is along Chong Die with the left margin of wave filter 20.On the contrary, the left margin of wave filter 20 is heavy in following scope with wave filter 10
It is folded, on the right of the scope median filter 10 along relative to the free transmission range of wave filter 10, especially relative to wave filter 10
Free transmission range in minimum insertion loss landing be less than 10dB.Wave filter 10 preferably has steeper than the right edge of the wave filter
Left margin.Wave filter 20 preferably has the right edge steeper than its left margin.
Fig. 3 B illustrate that result of the filtering device 100 between input wires terminal E100 and output wiring terminal A100 is obtained
Filter transfer function.The filter transfer function of control parameter S21 form is shown, the control parameter can be in input wires
Measure for example by means of network analyser between terminal E100 and output wiring terminal A100.As a result the filter transfer for obtaining
Function is relative to now substantially the intermediate frequency of 2000MHz has about 8% relative bandwidth.Filtering device can with regard to input and
The impedance of output and optimised in input and output with regard to the phase place of two wave filters 10 and 20.
By taking Fig. 3 B as an example it is evident that compared with the single filter on same vehicle substrate, by by two single filters
The wiring of ripple device can realize the filtering device with bandwidth more significantly larger than the bandwidth that two single filters have respectively.Together
When, such as the important filtering characteristic of edge steepness and specified temp characteristic keeps constant.Under this wave filter design conditions, work as list
The load that the filter construction of individual wave filter 10 and 20 is applied in the carrier substrates with high coupling, is for example made up of lithium niobate
When on body substrate, maximum bandwidth is realized.
Fig. 4 illustrates the embodiment of the back panel wiring of filtering device.The filtering device has wave filter 10 and wave filter 20.
Wave filter 10 and 20 is configured to so that their transfer function shows respectively the characteristic change curve of bandpass filter.Filter
The function of the transfer function of ripple device, especially control parameter S21 has free transmission range and stopband range, wherein in free transmission range
Insertion loss is less than the insertion loss in stopband range.In transition range between free transmission range and stopband range, two filters
Ripple device has respectively edge.The transfer function of wave filter 10 and the transfer function of wave filter 20 for example can correspond to institute in Fig. 3 A
The filter transfer function shown.
Wave filter 10 is connected to the signal between the input wires terminal E100 of filtering device and output wiring terminal A100
In the SP1 of path.Wave filter 20 is connected to the letter between the input wires terminal E100 of filtering device and output wiring terminal A100
In number path SP2.Two signal path SP1 and SP2 therefore filtering device input wires terminal and output wiring terminal it
Between it is in parallel.
Wave filter 10 has the input side E10 and the outlet side A10 for output signal for applying signal.Similarly,
Wave filter 20 has the input side E20 and the outlet side A20 for output signal for applying signal.For applying the defeated of signal
Enter side E10 to be connected with the input wires terminal E100 of filtering device via match circuit 30.For from the output signal of wave filter 10
Outlet side A10 be connected with the output wiring terminal A100 of filtering device via another match circuit 40.For signal to be applied
Input side E20 to wave filter 20 is directly connected with the input wires terminal E100 of filtering device.Wave filter 20 for exporting
The outlet side A20 of signal is directly connected with the output wiring terminal A100 of filtering device.
Match circuit 30 and 40 can for example be respectively configured to diplex network.Diplex network 30 and 40 distinguishes structure
Make for so that wave filter 10 is in the free transmission range of wave filter 20, at the frequency in the free transmission range D2 shown in such as Fig. 3 A
Characteristic with high ohm.Wave filter 10 for example can be in ratio at the frequency in the free transmission range D2 of wave filter 20 in wave filter 20
Stopband range S2 in frequency at more increase ohm.
Additionally, diplex network 30 and 40 is so structured that so that free transmission range D1 of the wave filter 20 in wave filter 10
In, there is at the frequency in for example shown in figure 3 a free transmission range D1 the characteristic of high ohm.Wave filter 20 for example can be right
Frequency in the free transmission range 1 of wave filter 10 is compared to the resistance in stopband range S1 of wave filter 10, shown in such as Fig. 3 A
It is configured to more increase ohm with the frequency in scope S1.
Diplex network 30 and 40 is so structured that so that the phase place of wave filter 10 and 20 matches each other to cause filtering
Device 10 has the characteristic and wave filter 20 of high ohm in wave filter 10 in the frequency range of the free transmission range of wave filter 20
Characteristic with high ohm in the frequency range of free transmission range.
Diplex network 30 is configured to cause the input of filtering device to connect in the case of illustrated embodiment in the diagram
The phase change of the signal between line terminals E100 and the input side E10 of wave filter 10.Diplex network 40 is configured to draw
Play the phase change of the signal between the outlet side A10 and the output wiring terminal A100 of filtering device of wave filter 10.
Using the filtering device being made up of single filter structure 10 and 20 and match circuit 30 and 40 shown in Fig. 4
Back panel wiring, can realize having between the input wires terminal E100 of filtering device and output wiring terminal A100 relative
In the filter transfer function of the significantly larger bandwidth of filter transfer function of single filter 10 and 20.Here, single filtering
The important filtering characteristic of device structure 10 and 20, such as edge steepness and specified temp characteristic keep constant.When wave filter 10 has
During free transmission range at the more low frequency of the free transmission range than wave filter 20, the left margin of wave filter 10 and the right side of wave filter 20
Edge is almost unchanged when two single filters link together according to the embodiment arranged in Fig. 4.
Fig. 5,6A, 6B, 7A and 7B illustrate the other possibility of the back panel wiring of the wave filter 10 and 20 of filtering device 100,
The bandwidth that can realize substantially being mentioned relative to single filter using these possibilities, wherein single filter 10,20 is another
Outer distinctive filter characteristic, such as edge steepness and specified temp characteristic keeps constant.
Fig. 5 illustrates another embodiment of the back panel wiring of filtering device 100.Single filter 10 is connected to filtering device
Input wires terminal E100 and output wiring terminal A100 between signal path SP1 in.Wave filter 20 is connected to wave filter
In signal path SP2 between the input wires terminal E100 and output wiring terminal A100 of part.Two Hes of single filter 10
20 is therefore in parallel between the input wires terminal and output wiring terminal of filtering device.The input side E10 of wave filter 10 via
Match circuit 30, such as diplex network are connected with the input wires terminal E100 of filtering device.The outlet side of wave filter 10
A10 is directly connected with the output wiring terminal A100 of filtering device.The input side E20 of wave filter 20 is directly defeated with filtering device
Enter binding post E100 connections.The outlet side A20 of wave filter 20 is via match circuit 40, such as diplex network and wave filter
The output wiring terminal A100 connections of part.
Diplex network 30 is configured to so that frequency of the impedance in the SP1 of path in the free transmission range of wave filter 20
It is high ohm at rate.For example, the impedance of signal path SP1 can be compared to for the frequency in the free transmission range of wave filter 20
Frequency in the stopband range of wave filter 20 more increases ohm.Accordingly, diplex network 40 is configured to so that signal road
Impedance in the SP2 of footpath becomes high ohm at the signal frequency in the free transmission range of wave filter 10.For example, in signal path SP2
The impedance signal that can be compared to for the signal frequency in the free transmission range of wave filter 10 in the stopband range of wave filter 10
Frequency more increases ohm.
Diplex network 30 is for example so structured that so that at the frequency in the free transmission range of wave filter 20
Signal path SP1 or wave filter 10 play idle running effect for signal.Accordingly, diplex network 40 is so structured that so that
Signal path SP2 or wave filter 20 play idle running effect for the signal frequency in the free transmission range of wave filter 10.
In the fig. 4 embodiment, diplex network 30 be configured to cause filtering device input wires terminal E100 and
The phase change of the signal between the input side E10 of wave filter 10.Diplex network 40 is configured to cause the defeated of wave filter 20
The phase change of the signal gone out between side A20 and the output wiring terminal A100 of filtering device.
In figures 4 and 5 in the embodiment of shown filtering device, single filter 10 and 20 has respectively asymmetric
Input side and outlet side（It is unbalanced/unbalanced；Single-ended/single-ended）.In fig. 6 in shown embodiment, filtering
Device 10 has asymmetric input side（It is unbalanced；Single-ended）With symmetrical outlet side（Balance）.Single filter structure
The 10 and 20 input wires terminal E100 and output wiring terminal A100 that filtering device is connected in parallel in signal path SP1 and SP2
Between.
The input wires terminal E10 of wave filter 10 is via match circuit 30, such as diplex wave filter and filtering device
Input wires terminal E100 connection.The outlet side A10 of wave filter 10 is via match circuit 40, such as diplex network and filter
The output wiring terminal A100 connections of wave device.Because symmetrical output end, wave filter 10 have another outlet side A10 ', this is another
One outlet side is connected via match circuit 50 with the output wiring terminal A100 of filtering device.The input side E20 of wave filter 20 is straight
Connect and be connected with the input wires terminal E100 of filtering device.The outlet side A20 of wave filter 20 is equally directly defeated with filtering device
Go out binding post A100 connections.
Fig. 6 B illustrate another embodiment of filtering device, wherein with embodiment different output port structure shown in Fig. 6 A
Make as symmetrical.Therefore filtering device has output wiring terminal A100 and output wiring terminal A100 '.Wave filter 20 and Fig. 6 A
In the embodiment that illustrates to be configured differently be asymmetric and symmetrical in outlet side in input side.Therefore wave filter 20 has defeated
Go out side A20 and another outlet side A20 '.The outlet side A10 of wave filter 10 and the outlet side A20 of wave filter 20 and outlet terminal
Sub- A100 connections.Other outlet side A10 ', the A20 ' of wave filter 10,20 is connected with other output wiring terminal A100 '.Together
It is connected between the outlet side A10 of wave filter 10 and the outlet side A20 of wave filter 20 to duplex network 40.Diplex network 50
It is connected between the other outlet side A10 ' of wave filter 10 and the other outlet side A20 ' of wave filter 20.
Embodiment shown in diplex network 30,40 and 50 and Fig. 1 be configured similarly to single filter 10 and
20 phase place matches each other so that the spy with high ohm in the frequency range of the free transmission range of wave filter 10 of wave filter 20
Property.Additionally, diplex network 30,40 and 50 is configured to so that frequency of the wave filter 10 in the free transmission range of wave filter 20
Characteristic of the place with high ohm.Especially, match circuit 30,40 and 50 is so structured that so that wave filter 20 is for wave filter
Work higher ohm of frequency that frequency in 10 free transmission range is compared in the stopband range of wave filter 10, and filter
Device 10 more increases ohm for the frequency that the frequency in the free transmission range of wave filter 20 is compared in the stopband range of wave filter 20.
Fig. 7 A illustrate another embodiment of the back panel wiring of the wave filter 10 and 20 of filtering device 100.With institute in Fig. 6 A
Show that embodiment is different, wave filter 10 is configured with symmetrical input side（Balance/balance）With symmetrical outlet side（Balance
/ balance）Single filter.Different from Fig. 6 A, therefore wave filter 10 has another input side E10 ', another input side
It is connected with the input wires terminal E100 of filtering device via match circuit 60, such as diplex network.
Fig. 7 B illustrate another embodiment of filtering device, wherein filtering device different from the embodiment shown in Fig. 7 A
It is configured to using input wires terminal E100 and another input wires terminal E100 ' in input side symmetrical and sharp in outlet side
It is configured to output wiring terminal A100 and another output wiring terminal A100 ' symmetrical.Wave filter 10 have input side E10 and
Another input side E10 ' and outlet side A10 and another outlet side A10 '.Similarly, wave filter 20 has input side E20 and another
One input side E20 ' and outlet side A20 and another outlet side A20 '.
Diplex network 30 is connected to the input side E10 of wave filter 10 and the input side E20 of wave filter 20 or wave filter
Between the input wires terminal E100 of part.Diplex network 40 is connected to the outlet side A10 of wave filter 10 and wave filter 20
Between outlet side A20 or the output wiring terminal A100 of filtering device.Diplex network 50 is connected to wave filter 10 in addition
Outlet side A10 ' and wave filter 20 other outlet side A20 ' or filtering device other output wiring terminal A100 ' it
Between.Diplex network 60 is connected to the other input side E10 ' of the wave filter 10 and other input side E20 ' of wave filter 20
Or between the other input wires terminal E100 ' of filtering device.
In the case of embodiment shown in Fig. 7 A, 7B, diplex network 30,40,50 and 60 be also substantially configured to by
The phase place of wave filter match each other for so that wave filter 20 has Gao Ou at the signal frequency in the free transmission range of wave filter 10
The characteristic of nurse, and be on the contrary high ohm at signal frequency of the wave filter 10 in free transmission range of its side in wave filter 20
's.Wave filter 10 for example can be for the signal fusing of the frequency in the free transmission range with wave filter 20 be in the resistance of wave filter 20
More increase ohm with the signal in scope.Wave filter 20 can be for the signal of the frequency in the free transmission range with wave filter 10
The signal being compared in the stopband range of wave filter 10 has the characteristic for more increasing ohm.Diplex network for example can also be
This is configured to so that signal path SP1 is almost unloaded and signal for the signal in the free transmission range of wave filter 20
Path SP2 almost plays unloaded effect for the range of signal in the free transmission range of wave filter 10.
In the case of embodiment shown in Fig. 4,5,6A, 6B, 7A and 7B, there is at least one matching network or same respectively
Input side E10, E10 of wave filter 10 are connected to duplex network ' and the input side E20 of wave filter 20 between.At least one is another
Outer match circuit or other diplex network connection are in outlet side A10, A10 ' and wave filter 20 outlet side A20 it
Between.
In the embodiment of Fig. 6 A and 7A, wave filter 10 is only configured to asymmetric/symmetrical side（Unbalanced/
Balance）Wave filter or be configured to be in input side and outlet side symmetry status（Balance/balance）.Similarly,
Wave filter 20 can also be embodied as in side to be asymmetric and is symmetrical in opposite side（Unbalanced/balance）Or
Input side is symmetrical and is symmetrical in outlet side（Balance/balance）.In the case of this embodiment, in Fig. 6 A
Be connected in 7A diplex network before and after wave filter 10 can also it is correspondingly connected to before wave filter 20 and
Afterwards.
Fig. 8 A, 8B, 8C, 8D and 8E illustrate the possible embodiment of diplex network 30,40,50 and 60.It is described in the same direction
Duplex network is substantially configured to cause the phase place of signal between its input and its output end.It is shown in fig. 8 a
Embodiment in the case of, diplex network is realized by conductor line P.Fig. 8 B and 8C are shown respectively coil L and electric capacity
The T-shaped wiring of device C.In the fig. 8b in the case of shown embodiment, two capacitor C diplex network input and
Connect between output end and coil L is connected to reference voltage terminal.In the case of embodiment shown in Fig. 8 C, two
Individual coil L connects between the input and output end of diplex network, wherein being connected between the coils with ginseng
Examine the capacitor C of voltage wiring terminal.Fig. 8 D and 8E illustrate the π shape wiring of coil L and capacitor C.The reality illustrated in Fig. 8 D
In the case of applying mode, capacitor C is connected between the input wires terminal of diplex network and output wiring terminal.Coil L
It is connected between input wires terminal and reference voltage terminal or output wiring terminal and reference voltage terminal
Between.In the case of embodiment shown in Fig. 8 E, coil L is connected to the input wires terminal of diplex network and output
Between binding post.Capacitor C is connected between input wires terminal and reference voltage terminal and another capacitor C connects
It is connected between output wiring terminal and reference voltage terminal.Reference voltage for example can be earth potential.
Fig. 9 A illustrate an embodiment, wherein the match circuit for being configured to diplex network be configured to capacitor C and
The T-shaped wiring of coil L.Diplex network for example may be coupled to the output wiring terminal E10 of wave filter 10.Matching network can
To be simplified, its mode is to arrange the element more less than three discrete components for illustrating in figure 9 a.Shown reality in figures 9 b and 9
In applying mode, matching network 30 for example only has an a capacitor C and coil L.In another embodiment, described point
Vertical element can be partially integrated into and be connected in the chip of wave filter below.Passive discrete component can also be integrated into filter
In the housing of wave device, such as low temperature calcination housing（LTCC housings）In.
Figure 10 illustrates another embodiment, and wherein matching network has discrete element, such as coil L, and it connects respectively
To filtering device before and after.In addition matching network can also have capacitor, and the capacitor for example can be with integrated
On the acoustics chip of filtering device.
By by two single filters be constructed so that filter transfer function overlap each other in free transmission range and
Match circuit, especially diplex network are connected between two wave filters in input side or in outlet side, it is possible to achieve
Filtering device with following total transfer function, total transfer function has significantly larger than the bandwidth of respective single filter
Bandwidth.Significantly greater than 4% relative bandwidth can be for example realized in the carrier substrates being made up of lithium tantalate.Filtering device can
To be constructed so that total transfer function has especially steep left margin or especially steep the right edge.Can also realize having
The transfer function at two especially steep edges.
Reference numerals list
10 wave filters
20 wave filters
30 match circuits（Diplex network）
40 match circuits（Diplex network）
50 match circuits（Diplex network）
60 match circuits（Diplex network）
70 housings
100 filtering devices
E input wires terminals
A output wiring terminals
L coils
C capacitors.
Claims (24)
1. filtering device, including：
- be used to apply the input wires terminal of signal（E100）,
- for the output wiring terminal of output signal（A100）,
Characterized in that, the filtering device also includes：
- there is asymmetric input and outlet side（E10, A10）The first wave filter（10）,
- there is asymmetric input and outlet side（E20, A20）The second wave filter（20）,
- housing（70）, first wave filter（10）With the second wave filter（20）Same vehicle lining is disposed in the housing
On bottom,
- wherein the first and second wave filters（10、20）It is connected to input wires terminal（E100）And output wiring terminal
（A100）Between signal path (SP1, SP2) in, two of which signal path（SP1, SP2）It is connected in parallel on the input terminal
Son（E100）With the output wiring terminal（A100）Between,
- wherein the first wave filter（10）There is the first free transmission range in frequency spectrum（D1）And the second wave filter（20）In frequency spectrum
In have the second free transmission range（D2）,
- wherein the first free transmission range（D1）With the second free transmission range（D2）Each other at least local overlaps so that the first wave filter
（10）The right along and the second wave filter（20）Overlap in following scope：Second wave filter in this range（20）Left margin
Landing is less than 10dB, and the second wave filter（20）Left margin and the first wave filter（10）Overlap in following scope：At this
First wave filter in scope（10）The right be less than 10dB, and first wave filter along landing（10）Left margin it is righter than it
Edge is steeper, and second wave filter（20）The right along steeper than its left margin,
- wherein it is configured to the first diplex network of match circuit（30）It is connected to the input side of the first wave filter（E10）
With the second wave filter（20）Input side（E20）Between,
- wherein it is configured to the second diplex network of match circuit（40）It is connected to the outlet side of the first wave filter（A10）
With the second wave filter（20）Outlet side（A20）Between.
2. filtering device according to claim 1, it is characterised in that
At least one of-the first and second wave filters are with least one other outlet side（A10’）,
- the three diplex network（50）The other outlet side of be connected in the wave filter（A10’）And filtering
Another outlet side in device（A20）Between.
3. filtering device according to claim 2, it is characterised in that
At least one of-the first and second wave filters are with least one other input side（E10’）,
- the four diplex network（60）The other input side of be connected in wave filter（E10’）In wave filter
Another input side（E20）Between.
4. filtering device according to claim 1, it is characterised in that
- the first and second wave filters（10、20）Outlet side be configured to it is symmetrical and respectively have other outlet side
（A10’、A20’）,
- the three diplex network（50）It is connected to the first wave filter（10）Other outlet side（A10’）With the second filtering
Device（20）Other outlet side（A20’）Between.
5. filtering device according to claim 4, it is characterised in that
- the first and second wave filters（10、20）Input side be configured to it is symmetrical and respectively have other input side
（E10、E10’）,
- the four diplex network（60）It is connected to the first wave filter（10）Other input side（A10’）With the second filtering
Device（20）Other input side（A20’）Between.
6. according to the filtering device of one of claim 1 to 5, it is characterised in that
Diplex network（30、40、50、60）It is configured to so that the first wave filter（10）It is configured in the second passband model
Enclose（D2）In frequency at more increase ohm, and the second wave filter at frequency of the ratio in the stopband range of the second wave filter
（20）It is configured in the first free transmission range（D1）In frequency at frequency of the ratio in the stopband range of the second wave filter more
Increase ohm.
7. according to the filtering device of one of claim 1 to 5, it is characterised in that
Diplex network（30、40、50、60）It is configured to so that in the first free transmission range（D1）In frequency at, with
Two wave filters（20）There is height to the signal path of the corresponding diplex network at the input side and outlet side of the second wave filter
The impedance of ohm, and in the second free transmission range（D2）In frequency at, with the first wave filter（10）With the first wave filter
The signal path of the corresponding diplex network at input side and outlet side has the impedance of high ohm.
8. according to the filtering device of one of claim 1 to 5, it is characterised in that
At least one of diplex network is configured to cause the input wires terminal of filtering device（E100）With the first filter
Ripple device（10）Input side（E10）Between signal phase change.
9. according to the filtering device of one of claim 1 to 5, it is characterised in that
At least one of diplex network is configured to cause the output wiring terminal of filtering device（A100）With the second filter
Ripple device（20）Outlet side（A20）Between signal phase change.
10. filtering device according to claim 1, it is characterised in that
Diplex network（30、40、50、60）Include passive element respectively（P、L、C）.
11. filtering devices according to claim 10, it is characterised in that
The passive element（P、L、C）It is coil（L）, capacitor（C）And/or circuit（P）The wiring of π shapes or T-shaped wiring.
12. filtering devices according to claim 10, it is characterised in that
Diplex network（30、40、50、60）Element（P、L、C）It is at least partly integrated in the first wave filter（10）And/or
Second wave filter（20）In.
13. according to the filtering device of one of claim 10 to 12, it is characterised in that
- the first and second wave filters（10、20）There is respectively metal structure（1、2、3、4、5）, the metal structure is arranged in lining
Bottom（6）On,
- diplex network（30、40、50、60）Element（P、L、C）In being at least partly integrated in substrate.
14. according to the filtering device of one of claim 10 to 12, it is characterised in that
Diplex network（30、40、50、60）Element（P、L、C）It is at least partially integrated into the housing of filtering device（70）
In.
15. filtering devices according to claim 14, it is characterised in that
The housing（70）It is low temperature calcination housing.
16. according to claim 1 to 5, one of 10 to 12 filtering device, it is characterised in that
First and second wave filters（10、20）It is configured to so that the first free transmission range（D1）In than the second free transmission range
（D2）In low frequency range.
17. according to claim 1 to 5, one of 10 to 12 filtering device, it is characterised in that
- the first wave filter（10）It is configured such that the first free transmission range（D1）With the right than the first free transmission range along more
Steep left margin,
- the second wave filter（20）It is configured such that the second free transmission range（D2）With the left margin than the second free transmission range more
Steep the right edge.
18. according to claim 1 to 5, one of 10 to 12 filtering device, it is characterised in that
First wave filter（10）With the second wave filter（20）It is respectively configured to acoustic filter.
19. filtering devices according to claim 18, it is characterised in that
The acoustic filter is SAWF, critical wave filter or volume wave filter.
20. according to claim 1 to 5, one of 10 to 12 filtering device, it is characterised in that
The filtering device has the 3rd free transmission range（D3）, the 3rd free transmission range extends through the first free transmission range（D1）With
Second free transmission range（D2）, wherein insertion loss of the filtering device in the 3rd free transmission range less than 5dB fluctuating.
21. filtering devices according to claim 20, it is characterised in that
3rd free transmission range（D3）With the relative bandwidth more than 4%.
22. filtering devices according to claim 20, it is characterised in that
Filtering device is in the 3rd free transmission range（D3）In in input wires terminal or output wiring terminal（E100、A100）Place has
Little change in terms of the absolute value of nominal impedance.
23. according to claim 1 to 5, one of 10 to 12 filtering device, it is characterised in that
First and second wave filters（10、20）There is respectively the frequency characteristic with resistance.
24. according to claim 1 to 5, one of 10 to 12 filtering device, it is characterised in that
First wave filter（10）It is tunable optic filter.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102010055648.3A DE102010055648B4 (en) | 2010-12-22 | 2010-12-22 | filter device |
| DE102010055648.3 | 2010-12-22 | ||
| PCT/EP2011/071657 WO2012084461A1 (en) | 2010-12-22 | 2011-12-02 | Filter component |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103262411A CN103262411A (en) | 2013-08-21 |
| CN103262411B true CN103262411B (en) | 2017-05-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201180061779.2A Active CN103262411B (en) | 2010-12-22 | 2011-12-02 | Filter component |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN103262411B (en) |
| DE (1) | DE102010055648B4 (en) |
| WO (1) | WO2012084461A1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102576845B1 (en) * | 2015-06-03 | 2023-09-11 | 가부시키가이샤 와이솔재팬 | Acoustic wave device |
| CN105680821A (en) * | 2015-12-25 | 2016-06-15 | 北京长峰微电科技有限公司 | High-frequency, high-power, narrow-band and low-loss filter |
| DE102016106185A1 (en) * | 2016-04-05 | 2017-10-05 | Snaptrack, Inc. | Broadband SAW filter |
| DE102018131054B4 (en) * | 2018-12-05 | 2020-10-08 | RF360 Europe GmbH | Micro-acoustic RF filter |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0744831A2 (en) * | 1995-05-16 | 1996-11-27 | Matsushita Electric Industrial Co., Ltd. | Wireless unit for a time division multiple access system |
| EP1150425A1 (en) * | 1999-10-04 | 2001-10-31 | Kabushiki Kaisha Toshiba | Saw device |
| CN1708899A (en) * | 2002-10-25 | 2005-12-14 | 日立金属株式会社 | Balanced-unblanced type multi-band filer module |
| EP2175567A1 (en) * | 2007-08-03 | 2010-04-14 | Sharp Kabushiki Kaisha | Communication device |
| CN101841074A (en) * | 2009-03-19 | 2010-09-22 | 富士通株式会社 | Filter, filtering method and communication equipment |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2069369C (en) | 1992-05-25 | 1995-12-05 | Robert C. Peach | Filterbank using surface acoustic wave technology |
| JP3001350B2 (en) | 1993-05-19 | 2000-01-24 | 日本電気株式会社 | Surface acoustic wave filter |
| JP3480445B2 (en) * | 2001-01-10 | 2003-12-22 | 株式会社村田製作所 | Surface acoustic wave device |
| JP5016467B2 (en) * | 2007-12-14 | 2012-09-05 | 太陽誘電株式会社 | Elastic wave filter |
-
2010
- 2010-12-22 DE DE102010055648.3A patent/DE102010055648B4/en active Active
-
2011
- 2011-12-02 WO PCT/EP2011/071657 patent/WO2012084461A1/en active Application Filing
- 2011-12-02 CN CN201180061779.2A patent/CN103262411B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0744831A2 (en) * | 1995-05-16 | 1996-11-27 | Matsushita Electric Industrial Co., Ltd. | Wireless unit for a time division multiple access system |
| EP1150425A1 (en) * | 1999-10-04 | 2001-10-31 | Kabushiki Kaisha Toshiba | Saw device |
| CN1708899A (en) * | 2002-10-25 | 2005-12-14 | 日立金属株式会社 | Balanced-unblanced type multi-band filer module |
| EP2175567A1 (en) * | 2007-08-03 | 2010-04-14 | Sharp Kabushiki Kaisha | Communication device |
| CN101841074A (en) * | 2009-03-19 | 2010-09-22 | 富士通株式会社 | Filter, filtering method and communication equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103262411A (en) | 2013-08-21 |
| WO2012084461A1 (en) | 2012-06-28 |
| DE102010055648B4 (en) | 2018-03-22 |
| DE102010055648A1 (en) | 2012-06-28 |
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