CN109802651A - Surface acoustic wave filter and electronic product - Google Patents
Surface acoustic wave filter and electronic product Download PDFInfo
- Publication number
- CN109802651A CN109802651A CN201910142660.6A CN201910142660A CN109802651A CN 109802651 A CN109802651 A CN 109802651A CN 201910142660 A CN201910142660 A CN 201910142660A CN 109802651 A CN109802651 A CN 109802651A
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- Prior art keywords
- filter
- radio
- wave filter
- acoustic wave
- surface acoustic
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- 238000010897 surface acoustic wave method Methods 0.000 title claims abstract description 25
- 238000004806 packaging method and process Methods 0.000 claims abstract description 31
- 238000005538 encapsulation Methods 0.000 description 12
- 238000001914 filtration Methods 0.000 description 5
- 239000000758 substrate Substances 0.000 description 4
- 239000003990 capacitor Substances 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000011358 absorbing material Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000010358 mechanical oscillation Effects 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 238000001259 photo etching Methods 0.000 description 2
- 230000000644 propagated effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 210000004556 brain Anatomy 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- GQYHUHYESMUTHG-UHFFFAOYSA-N lithium niobate Chemical compound [Li+].[O-][Nb](=O)=O GQYHUHYESMUTHG-UHFFFAOYSA-N 0.000 description 1
- 238000005498 polishing 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
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Landscapes
- Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)
Abstract
The present invention provides a kind of surface acoustic wave filter and electronic products, comprising: SAW filter；The SAW filter and packaging form pin network；The pin network is that two sides device is parallel to ground, and series connection one device in centre forms the circuit of π shape.Surface acoustic wave filter of the present invention can make the compatible scheme of radio-frequency filter SAW common at present become simple, the goods of furniture for display rather than for use space of electronic device is reduced, cabling is convenient and simple, is more advantageous to the circuit design of entire product, shorten the product design period, reduces product cost.
Description
Technical field
The present invention relates to a kind of filter and electronic products.
Background technique
It needs to use radio-frequency filter SAW in existing radio frequency design scheme, generally uses the device of 1109 encapsulation, encapsulation
Pad is unable to the capacitance-resistance inductor component that compatible radio often uses 0201.Radio-frequency filter SAW can be usually encountered in radio frequency design scheme to be needed
The design to be compatible with is exactly that radio frequency path can establish two kinds of cabling modes, and one is by radio-frequency filter SAW, one is logical
The capacitance-resistance inductor component for crossing 0201 skips radio-frequency filter SAW.The purpose of this design is that the performance of radio frequency is not required in practical debugging
Radio-frequency filter SAW is used, can realize filter action using the network that 0201 capacitance-resistance inductor component is reached, or completely not
With filtering.The design that radio-frequency filter SAW and not applicable radio-frequency filter SAW are used by jumper selection this at present,
Goods of furniture for display rather than for use area is big, and cabling is complicated.The design of electronic products such as present mobile phone, motherboard space is smaller and smaller, electronic device goods of furniture for display rather than for use space
It is all very limited, goods of furniture for display rather than for use space is reduced, if present uses multiple current radio-frequency filter SAW compatible designs, it will give mainboard
More spaces after increase, are unfavorable for the design of entire product, increase certain cost.
1109 encapsulation and 0201 encapsulation are the current commonly used resistance of mobile phone electronic industry, capacitor, inductance component
Packing forms.
Summary of the invention
Technical problem to be solved by the invention is to provide a kind of surface acoustic wave filter, common at present penetrate can be made
The compatible scheme of frequency filter SAW becomes the goods of furniture for display rather than for use space for simply reducing electronic device, and cabling is convenient and simple, is more advantageous to entire
The circuit design of product shortens the product design period, reduces product cost.
In order to solve the above technical problems, the present invention provides a kind of surface acoustic wave filters, comprising: surface acoustic wave filter
Wave device；The SAW filter and packaging form pin network；The pin network is that two sides device is parallel to ground, in
Between connect a device, formed π shape circuit.
The beneficial effect of surface acoustic wave filter of the present invention is: can make radio-frequency filter common at present
The compatible scheme of SAW becomes the goods of furniture for display rather than for use space for simply reducing electronic device, and cabling is convenient and simple, is more advantageous to the electricity of entire product
Road design, shortens the product design period, reduces product cost.
Preferably, the input terminal of the surface wave filter forms pin network input terminal with packaging.
Preferably, the output end of the surface wave filter forms pin network output end with packaging.
Preferably, ground pad of the ground pad of the surface wave filter with packaging composition pin network.
Preferably, it when product is needed using radio-frequency filter, is carried out on printed circuit board using radio-frequency filter
Patch.
Preferably, when not needing to need the pin network formed using packaging to reach filtering net using radio-frequency filter
When network, 3 packagings, the pin network of composition are pasted on the pad of radio-frequency filter position on a printed circuit board.
Preferably, when not needing using radio-frequency filter, when not needing filter network yet, surface wave on a printed circuit board
1 packaging is pasted on the pad of filter location.
Preferably, the surface acoustic wave filter is applied to radio circuit.
The present invention also provides a kind of electronic product, including filter circuit, the filter circuit includes sound surface above-mentioned
Wave filter.
Detailed description of the invention
Invention is further described in detail with reference to the accompanying drawings and detailed description.
Fig. 1 is the schematic diagram of existing surface acoustic wave filter；
Fig. 2 is the schematic diagram of surface acoustic wave filter of the present invention.
Specific embodiment
Embodiment one,
As shown in Figure 1, radio-frequency filter SAW of the present invention is SAW filter (surface acoustic
Wave) abbreviation radio-frequency filter SAW filter plays the role of filtering in radio frequency design.It include: SAW filter；Institute
It states SAW filter and packaging forms pin network；The pin network is that two sides device is parallel to ground, centre series connection
One device forms the circuit of π shape.Surface acoustic wave filter of the present invention can make radio-frequency filter common at present
The compatible scheme of SAW becomes the goods of furniture for display rather than for use space for simply reducing electronic device, and cabling is convenient and simple, is more advantageous to the electricity of entire product
Road design, shortens the product design period, reduces product cost.The input terminal of the surface wave filter forms π with packaging
Type network input.The output end of the surface wave filter forms pin network output end with packaging.The surface wave filter
Ground pad of the ground pad of wave device with packaging composition pin network.
When product is needed using radio-frequency filter, patch is carried out using radio-frequency filter on printed circuit board.
When not needing that the pin network formed using packaging is needed to reach filter network using radio-frequency filter,
3 packagings, the pin network of composition are pasted on printed circuit board on the pad of radio-frequency filter position.
When not needing using radio-frequency filter, when not needing filter network yet, surface wave filter on a printed circuit board
1 packaging is pasted on the pad of position.
The surface acoustic wave filter is applied to radio circuit.
Of the present invention 0201 is encapsulated as a kind of current commonly used resistance of mobile phone electronic industry, capacitor, inductance component
Packing forms.Pin network be a kind of radio frequency it is commonly used use resistance, capacitor, inductance component composition circuit topological structure, two
Side device is parallel to ground, and series connection one device in centre is similar to a π type symbol.
The occupied space that the present invention solves radio-frequency filter SAW compatible design scheme in existing radio frequency design is big, printing
Circuit board trace is complicated, and then influences the flexibility of product whole design, causes the deficiency of increased costs.The invention can be with
The compatible scheme of radio-frequency filter SAW common at present is set to become the goods of furniture for display rather than for use space for simply reducing electronic device, cabling facilitates letter
It is single, it is more advantageous to the PCB design of entire product, shortens the product design period, reduces product cost.
As shown in Figure 1, the present invention is a kind of radio-frequency filter of the encapsulation of the pin network of 0201 packaging of compatibility composition
SAW encapsulating products.The encapsulation of the pin network of 0201 packaging composition is exactly that commonly a kind of circuit is set in radio frequency principle design
Topological structure is counted, the device encapsulated using 3 0201,0201 device of two sides is parallel to ground, one 0201 wrapper of centre series connection
Part.The pad size of the pin network of the pad of the encapsulation of radio-frequency filter SAW product of the invention and 0201 packaging composition
Position consistency, principle consistent (pin network input terminal of the input terminal of radio-frequency filter SAW with 0201 packaging composition, radio frequency
The pin network output end that the output end of filter SAW is formed with 0201 packaging, the ground pad of radio-frequency filter SAW are same
The ground pad of the pin network of 0201 packaging composition).
Technical solution service condition of the present invention is as follows: when design of electronic products such as mobile phones, use is of the present invention
The principle of technical solution is designed, and printed circuit board carries out goods of furniture for display rather than for use cabling using product of the invention.When product need using
When radio-frequency filter, patch is carried out using radio-frequency filter SAW on printed circuit board.When product does not need to filter using radio frequency
Wave device, when the pin network formed using 0201 packaging being needed to reach filter network, it is only necessary to radio frequency on a printed circuit
3 0201 packagings debugged out, the pin network of composition are pasted on the pad of the position filter SAW.When product does not need
Using radio-frequency filter, when not needing filter network, it is only necessary to the pad of the position radio-frequency filter SAW on a printed circuit yet
It is upper to paste 1 0201 packaging debugged out.
To sum up, the radio-frequency filter SAW device of compatible 0201 encapsulation of the present invention, can not have to original radio frequency again in design
Increase wire jumper route on the route of filter SAW design, electronic product mainboard radio frequency goods of furniture for display rather than for use space can be reduced and cabling space (subtracts
Few about 1/2 to 1/3) board area, is reduced, increases space for electronic product whole design, design is more flexible, reduces cost.
The encapsulation of incompatible 0201 device of pad of radio-frequency filter SAW product encapsulation currently on the market.Institute of the present invention
State the pad of the compatible 3 0201 devices encapsulation of encapsulation welding tray of technical solution.Use common radio-frequency filter SAW currently on the market
It needs wire jumper is compatible to go radio-frequency filter SAW scheme according to the scheme that principle above designs, printed circuit board goods of furniture for display rather than for use area and walks
Line area all increased, and cabling is also more complicated, and this is relatively good goods of furniture for display rather than for use state, in special circumstances increased area
It is bigger.Radio-frequency filter SAW is gone to use 0201 according to the scheme that principle above designs using radio-frequency filter SAW product of the present invention
The printed circuit board goods of furniture for display rather than for use area of the network of device composition not will increase, and cabling is also uncomplicated.Remove radio-frequency filter SAW design
When, it is only necessary to 0201 device patch is used on the pad of original radio-frequency filter SAW.Use rf filtering of the invention
Device SAW product reaches radio frequency and often uses principle design function, and goods of furniture for display rather than for use and cabling area reduce at least 1/2 to 1/3.
SAW filter of the present invention is to evaporate layer of metal film in one piece of material base with piezoelectric effect,
Then through photoetching, a pair of of interdigitated electrodes composition is respectively formed at both ends.After adding signal voltage on transmitting transducer, just exist
Input interdigital electrode between formed an electric field make piezoelectric material occur mechanical oscillation (i.e. ultrasonic wave) in the form of ultrasonic wave to the left
Right both sides are propagated, and the energy of the side Xiang Bianyuan is absorbed by sound-absorbing material.In receiving end, by reception energy converter by mechanical oscillation again
It is converted into electric signal, and is exported by interdigitated electrodes.
SAW filter of the present invention is using piezo-electric crystals such as quartz, lithium niobate or pricker lead titanates as substrate, through table
Layer of metal film is evaporated on it after the polishing of face, and two groups of interdigitals with energy conversion function are made by photoetching process
Metal electrode is referred to as input interdigital transducer and output interdigital transducer.When input interdigital transducer connects alternating voltage
When signal, the surface of piezo-electric crystal substrate just generates vibration, and inspires the sound wave with external signal same frequency, this sound wave is main
It is propagated along the direction risen with interdigital electrode on the surface of substrate, therefore referred to as sound surface filtering, the sound wave in one of direction
Dividend sound-absorbing material absorbs, and the sound wave in an other direction is then transmitted to output interdigital transducer, is converted into electric signal output.Sound
It is good, small in size and light-weight that surface wave filter has the characteristics that working frequency height, pass band, selecting frequency characteristic, and can adopt
It with production technology identical with integrated circuit, is simple to manufacture, at low cost, the consistency of frequency characteristic is good, therefore is widely used in
In various electronic equipments.In SAW filter, signal passes through the conversion twice of electro-acoustic-electricity, since the piezoelectricity of substrate is imitated
It answers, then interdigital transducer has selecting frequency characteristic.Obviously, the collective effect of two interdigital transducers, makes SAW filter
Selecting frequency characteristic is ideal.
Embodiment two,
The present invention also provides a kind of electronic product, including filter circuit, the filter circuit includes sound surface above-mentioned
Wave filter.
Surface acoustic wave filter of the present invention is applied to mobile phone, palm PC, tablet computer, notebook electricity
The various electronic equipments such as brain, smartwatch, Intelligent bracelet.
The present invention is not limited to embodiments discussed above.The description of specific embodiment is intended to above in order to retouch
State and illustrate technical solution of the present invention.The obvious transformation or substitution enlightened based on the present invention should also be as being considered
Fall into protection scope of the present invention.Above specific embodiment is used to disclose best implementation method of the invention, so that this
The those of ordinary skill in field can reach of the invention using numerous embodiments of the invention and a variety of alternatives
Purpose.
Claims (9)
1. a kind of surface acoustic wave filter characterized by comprising SAW filter；
The SAW filter and packaging form pin network；
The pin network is that two sides device is parallel to ground, and series connection one device in centre forms the circuit of π shape.
2. surface acoustic wave filter as described in claim 1, which is characterized in that the input terminal of the surface wave filter is same
Packaging forms pin network input terminal.
3. surface acoustic wave filter as claimed in claim 2, which is characterized in that the output end of the surface wave filter is same
Packaging forms pin network output end.
4. surface acoustic wave filter as claimed in claim 3, which is characterized in that the ground pad of the surface wave filter is same
The ground pad of packaging composition pin network.
5. surface acoustic wave filter as claimed in claim 4, which is characterized in that when product is needed using radio-frequency filter
When, patch is carried out using radio-frequency filter on printed circuit board.
6. surface acoustic wave filter as claimed in claim 5, which is characterized in that when not needing to need using radio-frequency filter
The pin network to use packaging to form be when reaching filter network, on a printed circuit board the pad of radio-frequency filter position
3 packagings of upper patch, the pin network of composition.
7. surface acoustic wave filter as claimed in claim 6, which is characterized in that when not needing using radio-frequency filter,
When not needing filter network, 1 packaging is pasted on the pad of surface wave filter position on a printed circuit board.
8. surface acoustic wave filter as claimed in claim 7, which is characterized in that the surface acoustic wave filter is applied to
Radio circuit.
9. a kind of electronic product, including filter circuit, which is characterized in that the filter circuit includes as described in claim 1-8
Surface acoustic wave filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910142660.6A CN109802651A (en) | 2019-02-26 | 2019-02-26 | Surface acoustic wave filter and electronic product |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910142660.6A CN109802651A (en) | 2019-02-26 | 2019-02-26 | Surface acoustic wave filter and electronic product |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109802651A true CN109802651A (en) | 2019-05-24 |
Family
ID=66561355
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910142660.6A Pending CN109802651A (en) | 2019-02-26 | 2019-02-26 | Surface acoustic wave filter and electronic product |
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| Country | Link |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11340779A (en) * | 1998-05-22 | 1999-12-10 | Murata Mfg Co Ltd | Surface acoustic wave filter, duplexer, and communication equipment device |
| CN1722614A (en) * | 2004-07-13 | 2006-01-18 | 中国科学院声学研究所 | A kind of acoustic surface wave duplexer |
| CN1883113A (en) * | 2003-11-21 | 2006-12-20 | 松下电器产业株式会社 | Elastic surface wave filter |
| CN101217267A (en) * | 2008-01-03 | 2008-07-09 | 中兴通讯股份有限公司 | A sound surface wave filter module |
| CN108736909A (en) * | 2018-05-09 | 2018-11-02 | 深圳市盛路物联通讯技术有限公司 | The radio circuit and terminal of SAW filter combination anti aliasing purposes filter |
-
2019
- 2019-02-26 CN CN201910142660.6A patent/CN109802651A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11340779A (en) * | 1998-05-22 | 1999-12-10 | Murata Mfg Co Ltd | Surface acoustic wave filter, duplexer, and communication equipment device |
| CN1883113A (en) * | 2003-11-21 | 2006-12-20 | 松下电器产业株式会社 | Elastic surface wave filter |
| CN1722614A (en) * | 2004-07-13 | 2006-01-18 | 中国科学院声学研究所 | A kind of acoustic surface wave duplexer |
| CN101217267A (en) * | 2008-01-03 | 2008-07-09 | 中兴通讯股份有限公司 | A sound surface wave filter module |
| CN108736909A (en) * | 2018-05-09 | 2018-11-02 | 深圳市盛路物联通讯技术有限公司 | The radio circuit and terminal of SAW filter combination anti aliasing purposes filter |
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Application publication date: 20190524 |