CN203504508U - Surface Acoustic Wave Filters for Mobile Phones - Google Patents
Surface Acoustic Wave Filters for Mobile Phones Download PDFInfo
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- CN203504508U CN203504508U CN201320421204.3U CN201320421204U CN203504508U CN 203504508 U CN203504508 U CN 203504508U CN 201320421204 U CN201320421204 U CN 201320421204U CN 203504508 U CN203504508 U CN 203504508U
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- acoustic wave
- surface acoustic
- wave filter
- microns
- mobile phone
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- 238000010897 surface acoustic wave method Methods 0.000 title claims abstract description 53
- 239000000758 substrate Substances 0.000 claims description 16
- 241000216843 Ursus arctos horribilis Species 0.000 claims description 8
- 230000005611 electricity Effects 0.000 claims description 6
- 238000009434 installation Methods 0.000 claims description 5
- 229910052751 metal Inorganic materials 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 5
- 238000004806 packaging method and process Methods 0.000 claims description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 4
- 229910052802 copper Inorganic materials 0.000 claims description 4
- 239000010949 copper Substances 0.000 claims description 4
- 239000013078 crystal Substances 0.000 claims description 4
- GQYHUHYESMUTHG-UHFFFAOYSA-N lithium niobate Chemical compound [Li+].[O-][Nb](=O)=O GQYHUHYESMUTHG-UHFFFAOYSA-N 0.000 claims description 4
- 238000003780 insertion Methods 0.000 abstract description 8
- 230000037431 insertion Effects 0.000 abstract description 8
- 238000001914 filtration Methods 0.000 abstract description 4
- 230000008878 coupling Effects 0.000 description 6
- 238000010168 coupling process Methods 0.000 description 6
- 238000005859 coupling reaction Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 229910013641 LiNbO 3 Inorganic materials 0.000 description 1
- JRPBQTZRNDNNOP-UHFFFAOYSA-N barium titanate Chemical compound [Ba+2].[Ba+2].[O-][Ti]([O-])([O-])[O-] JRPBQTZRNDNNOP-UHFFFAOYSA-N 0.000 description 1
- 229910002113 barium titanate Inorganic materials 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
- 238000001259 photo etching Methods 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
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- Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)
Abstract
The utility model relates to the surface acoustic wave filter technical field, concretely to a surface acoustic wave filter used for a mobile phone. The surface acoustic wave filter comprises two reflecting gratings and a plurality of parallelly arranged interdigital energy transducers; the interdigital energy transducers are electrically in parallel connection and acoustically in series connection and are arranged between the reflecting gratings; the interdigital energy transducers are respectively divided into a plurality of electrode zones, wherein the electrode period of the electrode finger of each electrode zone is 2.8-4.8 micrometers. The surface acoustic wave filter used for a mobile phone has a wide bandpass width and small insertion loss and can meet radio frequency filtering requirement of a mobile phone.
Description
Technical field
The utility model relates to Surface Acoustic Wave Filter technical field, in particular to a kind of Surface Acoustic Wave Filter for mobile phone.
Background technology
Surface Acoustic Wave Filter is to utilize the piezoelectric effect character of the crystal such as quartz, lithium niobate, barium titanate to make.In the last few years, Surface Acoustic Wave Filter was widely used as the transceiving filter of device for mobile communication and antenna branching filter etc.
In correlation technique, for the Surface Acoustic Wave Filter of mobile phone, generally include a plurality of interdigital transducers, each interdigital transducer is used for exciting surface acoustic wave, and the plurality of interdigital transducer is formed on the piezoelectric substrate with piezoelectric effect.Particularly, on the burnishing surface of piezoelectric substrate, be manufactured with certain thickness metal film, on this metal film, by photoetching technique, form above-mentioned a plurality of interdigital transducer.A plurality of described interdigital transducers are arranged in the propagation path of acoustic surface wave propagation, and the acoustics connection each other of the plurality of interdigital transducer, and/or electricity connects.
In correlation technique, narrower for the Surface Acoustic Wave Filter bandpass width of mobile phone, insertion loss is larger, does not meet the requirement of mobile phone rf filtering.
Utility model content
The purpose of this utility model is to be provided for the Surface Acoustic Wave Filter of mobile phone, to solve the above problems.
Surface Acoustic Wave Filter for mobile phone is provided in embodiment of the present utility model, has comprised: two reflecting gratings and a plurality of interdigital transducer;
A plurality of described interdigital transducers are arranged side by side, and on acoustics in parallel, connect in a plurality of described interdigital transducer electricity, and a plurality of described interdigital transducers are between two described reflecting gratings;
All described interdigital transducers are divided into respectively a plurality of electrode districts, and the finger spacing that wherein electrode of each electrode district refers to is 2.8～4.8 microns.
The Surface Acoustic Wave Filter for mobile phone of the utility model above-described embodiment, comprise a plurality of interdigital transducers and two reflecting gratings, a plurality of interdigital transducers are by connecting on parallel connection in electricity and acoustics, and a plurality of interdigital transducers are between two reflecting gratings, the Surface Acoustic Wave Filter that formation is so set is longitudinal coupling multimode formula Surface Acoustic Wave Filter, longitudinal coupling multimode formula Surface Acoustic Wave Filter bandpass width is large, there is good attenuation characteristic, and the Surface Acoustic Wave Filter of the type not only easily excites non-equilibrium signal, and easily excite balanced signal.
Further, all interdigital transducers of the Surface Acoustic Wave Filter for mobile phone of the utility model embodiment are divided into respectively a plurality of electrode districts, the electrode cycle referring to by the electrode of setting in each electrode district, can reduce the bulk wave radiation of Surface Acoustic Wave Filter, the bandpass width that increases filter reduces insertion loss simultaneously.
Therefore the Surface Acoustic Wave Filter bandpass width for mobile phone of the utility model embodiment is wide, and insertion loss is little, more can meet the requirement of mobile phone rf filtering.
Accompanying drawing explanation
Fig. 1 shows the utility model embodiment for the Surface Acoustic Wave Filter interdigital transducer of mobile phone and the structural representation of reflecting grating;
Fig. 2 shows the utility model embodiment for the structural representation of the Surface Acoustic Wave Filter of mobile phone;
Fig. 3 shows the utility model embodiment for the amplitude-frequency response figure of the Surface Acoustic Wave Filter of mobile phone.
Accompanying drawing explanation: 1-reflecting grating, 2-interdigital transducer, 11-piezoelectric substrate, 12-surface installation portion, 13-pin, 14-packaging part.
Embodiment
Below by specific embodiment, also by reference to the accompanying drawings the utility model is described in further detail.
The utility model embodiment provides a kind of Surface Acoustic Wave Filter for mobile phone, as shown in Figure 1, comprising: two reflecting gratings 1 and a plurality of interdigital transducer 2;
In Fig. 1, a plurality of interdigital transducers 2 are arranged side by side, and on acoustics in parallel, connect in a plurality of interdigital transducer 2 electricity, and a plurality of interdigital transducers 2 are between two reflecting gratings 1;
All interdigital transducers 2 are divided into respectively a plurality of electrode districts, and the electrode cycle that wherein electrode of each electrode district refers to is 2.8～4.8 microns.
The Surface Acoustic Wave Filter for mobile phone of the utility model embodiment, comprise a plurality of interdigital transducers 2 and two reflecting gratings 1, a plurality of interdigital transducers 2 are by connecting on parallel connection in electricity and acoustics, and a plurality of interdigital transducers 2 are between two reflecting gratings 1, the Surface Acoustic Wave Filter that formation is so set is longitudinal coupling multimode formula Surface Acoustic Wave Filter, longitudinal coupling multimode formula Surface Acoustic Wave Filter bandpass width is large, there is good attenuation characteristic, and the Surface Acoustic Wave Filter of the type not only easily excites non-equilibrium signal, and easily excite balanced signal.
Further, all interdigital transducers 2 of the Surface Acoustic Wave Filter for mobile phone of the utility model embodiment are divided into respectively a plurality of electrode districts, the electrode cycle referring to by the electrode of setting in each electrode district, can reduce the bulk wave radiation of Surface Acoustic Wave Filter, the bandpass width that increases filter reduces insertion loss simultaneously.
Therefore the Surface Acoustic Wave Filter bandpass width for mobile phone of the utility model embodiment is wide, and insertion loss is little, more can meet the requirement of mobile phone rf filtering.
The quantity of the interdigital transducer 2 in the SAW (Surface Acoustic Wave) filter of the utility model embodiment is a plurality of, and particularly, as Fig. 1, the quantity of interdigital transducer 2 is three.And each interdigital transducer 2 in these three interdigital transducers 2 is divided into 4 electrode districts.
Further, in these 3 interdigital transducers of arranging side by side 2, be positioned at the electrode cycle that the electrode of 4 electrode districts of the interdigital transducer 2 in centre position refers to be respectively 4.4 microns, 4.0 microns, 3.2 microns and 2.8 microns; The electrode cycle that the electrode of 4 electrode districts of another two interdigital transducers 2 refers to arranges identical, is respectively 4.8 microns, 4.4 microns, 3.6 microns and 3.2 microns.
In these 3 interdigital transducers 2, the width that electrode refers to is identical, is 1.2～2.6 microns.
The Surface Acoustic Wave Filter for mobile phone of the utility model embodiment, also comprises: piezoelectric substrate; A plurality of interdigital transducers 2 are set on described piezoelectric substrate;
Particularly, described piezoelectric substrate is the lithium niobate crystal chip of 15 degree cut types, adopts the lithium niobate crystal chip of 15 degree cut types can make the coupling coefficient of surface wave filter high, and relative bandwidth is large.
In order to make interdigital transducer 2 on piezoelectric substrate, first on piezoelectric substrate, make metal film, particularly, the metal film arranging on piezoelectric substrate is copper film, the thickness of described copper film is 250～270 nanometers.
The width of the reflection grizzly bar of reflecting grating 1 is 2.4～5.2 microns, and two spacing that reflect between grizzly bars adjacent in reflecting grating 1 are 1.2～2.6 microns.The quantity that reflects grizzly bar in two reflecting gratings 1 equates, is 50～70;
In three interdigital transducers of arranging side by side 2, the length that is positioned at the interdigital transducer 2 in centre position is 3600～5160 microns, and another two interdigital transducers 2 equal in length is 1680～2160 microns.
As shown in Figure 2, the Surface Acoustic Wave Filter for mobile phone of the utility model embodiment, also comprises: packaging part 14; Packaging part 14 is provided with surperficial installation portion 12 and pin one 3, and particularly, pin one 3 comprises input pin and output pin; Piezoelectric substrate 11 sticks on surperficial installation portion 12; Input in all interdigital transducers 2 is connected with described input pin, and the output in all interdigital transducers 2 is connected with described output pin.
In addition, in Fig. 3, give the amplitude-frequency response of the Surface Acoustic Wave Filter for mobile phone of the present embodiment, as can be seen from the figure, the centre frequency 850MHz of this filter, minimum Insertion Loss 1.2dB, 12.6% bandpass width, meet the requirement of mobile phone radio-frequency filter.
Smooth for passband, eliminate ripples in band, by length weighting Asia, refer to that electrode minimizes it.
The piezoelectric substrate of the Surface Acoustic Wave Filter for mobile phone of the utility model embodiment adopts 15 ° of YX-LiNbO
3, electromechanical coupling factor is high, and relative bandwidth is large.
A plurality of interdigital transducers 2 that are used for the Surface Acoustic Wave Filter of mobile phone all adopt Pitch modulation (pitch-modulated), and each interdigital transducer 2 divides 4 electrode districts into because finger spacing is unequal, makes four electrode districts of interdigital transducer 2 have the different electrode cycles.
In addition, the reflected intensity due to single reflection grizzly bar in reflecting grating 1 increases with the increase of reflecting grizzly bar thickness, so the thickness that improves reflection grizzly bar is to reduce the insertion loss of filter, minimum can reaching below 2dB.Because of the group delay of excessive reflected intensity meeting deterioration of device, the utility model reflects grizzly bar thickness by control and has reached better group delay characteristic again.
The foregoing is only preferred embodiment of the present utility model, be not limited to the utility model, for a person skilled in the art, the utility model can have various modifications and variations.All within spirit of the present utility model and principle, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection range of the present utility model.
Claims (11)
1. for the Surface Acoustic Wave Filter of mobile phone, it is characterized in that, comprising: two reflecting gratings and a plurality of interdigital transducer;
A plurality of described interdigital transducers are arranged side by side, and on acoustics in parallel, connect in a plurality of described interdigital transducer electricity, and a plurality of described interdigital transducers are between two described reflecting gratings;
All described interdigital transducers are divided into respectively a plurality of electrode districts, and the electrode cycle that wherein electrode of each electrode district refers to is 2.8～4.8 microns.
2. the Surface Acoustic Wave Filter for mobile phone according to claim 1, is characterized in that, the quantity of described interdigital transducer is three.
3. the Surface Acoustic Wave Filter for mobile phone according to claim 2, is characterized in that, all described interdigital transducers are divided into respectively 4 electrode districts.
4. the Surface Acoustic Wave Filter for mobile phone according to claim 3, is characterized in that, the width that the electrode in all described interdigital transducers refers to is 1.2～2.6 microns.
5. the Surface Acoustic Wave Filter for mobile phone according to claim 4, it is characterized in that, in the described interdigital transducer that 3 are arranged side by side, be positioned at the electrode cycle that the electrode of 4 electrode districts of the interdigital transducer in centre position refers to be respectively 4.4 microns, 4.0 microns, 3.2 microns and 2.8 microns;
The electrode cycle that the electrode of 4 electrode districts of another two described interdigital transducers refers to arranges identical, is respectively 4.8 microns, 4.4 microns, 3.6 microns and 3.2 microns.
6. the Surface Acoustic Wave Filter for mobile phone according to claim 1, is characterized in that, also comprises: piezoelectric substrate;
A plurality of described interdigital transducers are set on described piezoelectric substrate;
Described piezoelectric substrate is the lithium niobate crystal chip of 15 degree cut types.
7. the Surface Acoustic Wave Filter for mobile phone according to claim 6, is characterized in that, the metal film arranging on described piezoelectric substrate is copper film, and the thickness of described copper film is 250～270 nanometers.
8. the Surface Acoustic Wave Filter for mobile phone according to claim 1, is characterized in that, the width of the reflection grizzly bar of described reflecting grating is 2.4～5.2 microns, and two spacing that reflect between grizzly bars adjacent in described reflecting grating are 1.2～2.6 microns.
9. the Surface Acoustic Wave Filter for mobile phone according to claim 1, is characterized in that, the quantity that reflects grizzly bar in two described reflecting gratings equates, is 50～70.
10. the Surface Acoustic Wave Filter for mobile phone according to claim 6, is characterized in that, also comprises: packaging part;
Described packaging part is provided with surperficial installation portion, input pin and output pin;
Described piezoelectric substrate sticks on described surperficial installation portion;
Input in all described interdigital transducers is connected with described input pin, and the output in all described interdigital transducers is connected with described output pin.
11. Surface Acoustic Wave Filter for mobile phone according to claim 2, it is characterized in that, in the described interdigital transducer that three are arranged side by side, the length that is positioned at the described interdigital transducer in centre position is 3600～5160 microns, another two described interdigital transducers equal in length is 1680～2160 microns.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320421204.3U CN203504508U (en) | 2013-07-12 | 2013-07-12 | Surface Acoustic Wave Filters for Mobile Phones |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320421204.3U CN203504508U (en) | 2013-07-12 | 2013-07-12 | Surface Acoustic Wave Filters for Mobile Phones |
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| Publication Number | Publication Date |
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| CN203504508U true CN203504508U (en) | 2014-03-26 |
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| CN201320421204.3U Expired - Fee Related CN203504508U (en) | 2013-07-12 | 2013-07-12 | Surface Acoustic Wave Filters for Mobile Phones |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104200262A (en) * | 2014-09-09 | 2014-12-10 | 北京中讯四方科技股份有限公司 | Large-capacity surface acoustic wave radio frequency tag |
| CN109716125A (en) * | 2016-10-11 | 2019-05-03 | 博势股份有限公司 | For the device and equipment by ultrasonic tesint component |
| CN115955210A (en) * | 2023-02-13 | 2023-04-11 | 成都频岢微电子有限公司 | Periodic gradual change surface acoustic wave filter and multiplexer |
-
2013
- 2013-07-12 CN CN201320421204.3U patent/CN203504508U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104200262A (en) * | 2014-09-09 | 2014-12-10 | 北京中讯四方科技股份有限公司 | Large-capacity surface acoustic wave radio frequency tag |
| CN109716125A (en) * | 2016-10-11 | 2019-05-03 | 博势股份有限公司 | For the device and equipment by ultrasonic tesint component |
| CN109716125B (en) * | 2016-10-11 | 2023-02-10 | 博势股份有限公司 | Device and apparatus for testing components by means of ultrasound |
| CN115955210A (en) * | 2023-02-13 | 2023-04-11 | 成都频岢微电子有限公司 | Periodic gradual change surface acoustic wave filter and multiplexer |
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|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140326 Termination date: 20150712 |
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| EXPY | Termination of patent right or utility model |