CN209374645U - Anti-interference filter and communication equipment - Google Patents
Anti-interference filter and communication equipment Download PDFInfo
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- CN209374645U CN209374645U CN201920198485.8U CN201920198485U CN209374645U CN 209374645 U CN209374645 U CN 209374645U CN 201920198485 U CN201920198485 U CN 201920198485U CN 209374645 U CN209374645 U CN 209374645U
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- 238000004891 communication Methods 0.000 title claims abstract description 27
- 238000001914 filtration Methods 0.000 claims abstract description 65
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- 238000005452 bending Methods 0.000 description 8
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Abstract
The application provides a kind of anti-interference filter applied in a communications device, it includes the filtering cavity that several connections form main coupling channel, it filters and is equipped with resonator in cavity, wherein the resonator of two filtering cavitys of head and the tail is separately connected input terminal and output end, along the harmonic wave cavity of main coupling channel sequence, in the presence of the concatenation unit being connected to each other between the resonator of at least one set of non-adjacent harmonic wave cavity, coupling control element is equipped between the resonator of non-adjacent harmonic wave cavity in at least one set concatenation unit, it is at least connected across level-one between the non-adjacent resonators of at least one set concatenation unit.The application anti-interference filter integrally can achieve required insertion loss, and required Q value, index is functional, and stability is good, small in size, and structure design is simplified, and processing technology is simple, and assembly technology is simplified, and reduces production cost, improves productivity effect.
Description
Technical field
This application involves fields of communication technology, more particularly to a kind of cavity body filter and its communication equipment of application.
Background technique
In the base station system of mobile communication, the carrying in particular frequency range is usually emitted by transmitting antenna and communicates number
According to signal of communication, and signal of communication is received by receiving antenna.By not only including above-mentioned spy in receiving antenna received signal
Determine in frequency range carrying communication data signal of communication, but also including outside many above-mentioned particular frequency ranges clutter or
Interference signal.Number is communicated from the carrying obtained in the particular frequency range that transmitting antenna emits in receiving antenna received signal
According to signal of communication, it usually needs the receiving antenna received signal is filtered by filter, by the carrying communicate number
According to signal of communication specific frequency outside clutter or interference signal filter out.
Currently, generalling use cavity body filter in base station system.When the passband of needs is very wide, the narrower bandwidth of garbage signal
When, inhibit garbage signal that will be more convenient using bandstop filter, bandstop filter is usually humorous by being separated by the serial or parallel connection of λ/4
Shake circuit composition, and the mode usually realized can use coaxial line, strip line, microstrip line, the realization such as suspended substrate stripline.Due to bandreject filtering
Device has itself some special advantage, so can achieve good effect for some scene applications, especially in antenna feeder system
Have in system and is especially widely applied.When only the signal of a certain frequency range being allowed to pass through, bandpass filter is usually selected, certain
In the case of index request, bandstop filter and bandpass filter can be converted mutually.
Conventional belt hinders filter design method as shown in Figure 1, including mainly using 1/4 in the bandstop filter design of routine
The serial or parallel connection resonant tank of wavelength line forms, the matching of Lai Shixian mobile jib (bending tap piece), meets band and system is suppressed to require,
When frequency is lower, wavelength line requires longer.The tap piece mobile jib 102 of bending, tap piece mobile jib are inserted between the cavity 101 of the structure
102 extend tap structure part 103 at equal intervals is inserted into each cavity 101, and tap adjustable delay time screw rod is additionally provided in cavity
104, which mainly leans on tap piece bending to realize that 1/4 wavelength transmission line transmits electromagnetic wave by transmission line.Such structure
The shortcomings that bending tap chip architecture it is complicated, be easily deformed, dimensional tolerance is larger, and frequency lower λ/4 transmission line need to longer (λ=c/
F), bending tap piece mobile jib is not easy to optimize return loss, and the machining accuracy of bending tap chip architecture part and assembly precision are equal
It is restricted by processing conditions and production environment, it is difficult to guarantee that the size of each bending tap chip architecture part can be consistent, lead
Time delay generation deviation between the bending tap chip architecture coupling that cause assembles and resonator, and the electricity of bandstop filter filter
The deviation that performance generates this time delay is very sensitive, causes batch production consistency poor, or even because machining accuracy not can guarantee
And cause product that can not produce in batches.In addition, under certain specific index requests, and under conventional structure design conditions,
The performance indicator of bandstop filter is affected, and causes performance unstable, and index easily changes, and entire communication system is influenced when serious
Overall performance.
Therefore it provides the chamber that a kind of performance is stable, return loss is low, structure is simple, time-delay deviation is small, homogeneity of product is high
Fluid filter is actually necessary.
Summary of the invention
The present application purpose is to provide a kind of simple structure, miniaturization, the stable anti-interference filter of performance and its answers
Communication equipment.
In order to solve the above technical problems, the technical solution that the application uses is:
There is provided a kind of anti-interference filter comprising several connect the filtering cavity for forming main coupling channel, filter chamber
It is equipped with resonator in vivo, wherein the resonator of two filtering cavitys of head and the tail is separately connected input terminal and output end, it is logical along main coupling
In the harmonic wave cavity of road sequence, the concatenation unit being connected to each other between the resonator that there is at least one set of non-adjacent harmonic wave cavity,
It is equipped between the resonator of non-adjacent harmonic wave cavity in at least one set concatenation unit and couples control element, described at least one
It is at least connected across level-one between the non-adjacent resonators of group concatenation unit.
The anti-interference filter of the application uses bandpass filter, by filtering cavity along main coupling channel ordering designs,
In conjunction with across the grade coupling between non-adjacent resonators, set compared to more conventional according to the quarter-wave transmission line of resonance frequency
For the bandstop filter of meter, structure designs simplerization, miniaturization, reduces the volume of cavity body filter, reduces cavity
Weight, material are reduced, and are made to produce the reduction of cavity body filter materials, are reduced production cost, improve productivity effect.Whole knot
In structure design, resonator and entire cavity, the machining accuracy and assembly precision of the devices such as coupling control element add existing
Work condition and production environment are all easily achieved.While the operation such as being readily transported, install, dismantling, be conducive to cavity body filter
It is integrated into relevant communication equipment or device, guarantees the normal operation of entire communication system.
In some specific embodiments, the anti-interference filter is equipped with nine filtering cavitys, the harmonic wave
The relationship that is of coupled connections between the resonator of cavity is integrally symmetric along main coupling channel.
In some embodiments, along the harmonic wave cavity of main coupling channel sequence, symmetrical there are two be separately connected
The concatenation unit of input terminal and output end, each concatenation unit include the resonator of four filtering cavitys, the grade receipts or other documents in duplicate
The resonator that the first filtering cavity of input terminal or output end is connected in member passes through with two non-adjacent resonators couples control
Element is of coupled connections.
In some embodiments, the resonator of the end filtering cavity in two concatenation units passes through coupling control
Element is of coupled connections.
Coupling control element is specifically arranged according to specific performance index by the application, while not only having considered index performance, but also
The complex process degree in production process is considered, so that the index of product is functional, with conventional band stop filter structure
Design compares: this bandpass filter uses less chamber, and less zero point realizes identical index performance, and index performance is more
Stablize, can achieve required insertion loss, required Q value.The application considerably reduces the overall volume of cavity body filter.Entirely
Product structure is simple, so that assembly technology is simplified, process flow is simple, and debugging is simple, greatly reduces Material Cost and people
Power cost, improves productivity effect.
In some embodiments, the coupling control element is capacitive cross coupling control element or perceptual cross-coupling
Control element, wherein connecting across being of coupled connections for level-one for capacitive coupling, the coupling control element is capacitive cross coupling
Control element；Across being of coupled connections as inductive coupled connection for two-stage, the coupling control element is perceptual cross-coupling control
Element.
In some embodiments, the capacitive cross coupling control element is using winged bar, the perception cross-coupling control
Element processed will use dowel.In whole structure design, resonator and entire cavity, tap fly the processing of the devices such as bar
Precision and assembly precision are all easily achieved in existing processing conditions and production environment.
In some embodiments, the filtering cavity arranges two rows and the arrangement that misplaces, and each filter of uplink up and down
Wave cavity is adjacent with two filtering cavitys of downlink.
In some embodiments, window is offered between the filtering cavity for arranging adjacent, the window is equipped with frequency modulation spiral shell
Bar.
In some embodiments, further comprise shell, the anti-interference filter filtering cavity outside with
Interval is equipped between the shell of anti-interference filter.It is equivalent to and has added a moat interval between filtering cavity and shell,
So that structure is more stable, index performance is more stable, and design is simple, and assembling and setting is simple, reduces cost, improves production efficiency.
In some embodiments, reinforcing rib has all been added between the window between each filtering cavity, so that structure is simply more
Stablize, index performance is more stable, and assembling and setting is simple.
The application also provides a kind of communication equipment comprising anti-interference filter as described above.The application filter is convenient for
While the operations such as transport, installation, disassembly, be conducive to cavity body filter and be integrated into relevant communication equipment or device, guarantees
The normal operation of entire communication system.
Compared with prior art, the application has the following advantages:
The anti-interference filter of the application uses bandpass filter, by filtering cavity along main coupling channel ordering designs,
In conjunction with across the grade coupling between non-adjacent resonators, set compared to more conventional according to the quarter-wave transmission line of resonance frequency
For the bandstop filter of meter, with less resonant cavity, less transmission zero (9 chamber, 5 zero point) reaches better performance and refers to
Mark, consistency is good, and structure designs simplerization, miniaturization, reduces the volume of cavity body filter, reduces cavity weight, material
Material is reduced, and cavity design occupies little space, and is made to produce the reduction of cavity body filter materials, is reduced production cost, improve production
Benefit.
In whole structure design, resonator and entire cavity, the devices such as coupling control element (tap flies bar etc.)
Machining accuracy and assembly precision are all easily achieved in existing processing conditions and production environment, can achieve required insertion damage
Consumption, required Q value, index is functional, considerably reduces the overall volume of cavity body filter.Assembly technology is simple, convenient for fortune
While the operations such as defeated, installation, disassembly, be conducive to cavity body filter and be integrated into relevant communication equipment or device, guarantees whole
The normal operation of a communication system.
In conclusion there are many this bandpass filter structures design advantage, structure design is simplified, and reduces overall volume, subtracts
Small cavity weight, the deformation index that is squeezed are changed very little, while ensure that the good performance indexes of product, are greatly reduced into
This, and stability is good, few chamber lacks zero point, and each index performance of product easily realizes that processing technology is simple, and assembly technology is simplified, drop
Low production cost, improves productivity effect, and convenient for loading, transport is conducive to the integrated design of communication equipment, is conducive to
Batch production improves production efficiency, so that entire communication system runs well.
Detailed description of the invention
Fig. 1 is conventional band stop filter structure schematic diagram；
Fig. 2 is the stereoscopic schematic diagram of the application anti-interference filter；
Fig. 3 is that chlamydate example structure schematic diagram is arranged in the application anti-interference filter；
Fig. 4 is the circuit realization principle figure of the application anti-interference filter；
Fig. 5 is the circuit topology figure of the application anti-interference filter；
Fig. 6 is the performance simulation figure of the application anti-interference filter.
Specific embodiment
The application is described in detail with embodiment with reference to the accompanying drawing.
Referring to Fig. 2, Fig. 2 is the schematic diagram of the application anti-interference filter embodiment.In the present embodiment anti-interference
Filter comprising it is multiple to connect the filtering cavity for forming main coupling channel, it is equipped with resonator in filtering cavity, it is logical along main coupling
In the harmonic wave cavity of road sequence, there is the concatenation unit being connected to each other between at least one set of non-adjacent harmonic wave cavity, it is described at least
Coupling control element, at least one set grade receipts or other documents in duplicate are equipped between the resonator of non-adjacent harmonic wave cavity in one group of concatenation unit
It is at least connected across level-one between the non-adjacent resonators of member.
In the present embodiment, the application anti-interference filter, which specifically includes, is successively of coupled connections into the first of main coupling channel
Filtering cavity 211, second filters cavity 212, third filtering cavity the 213, the 4th filters the filtering of cavity the 214, the 5th cavity 215,
The 6th filtering filtering cavity 217 of cavity the 216, the 7th, the 8th filtering cavity the 218, the 9th filter cavity 219, divide in filtering cavity
It is not correspondingly arranged the first resonator 221, the second resonator 222, third resonator 223, the 4th resonator 224, the 5th resonator
225, sixth resonator 226, the 7th resonator 227, the 8th resonator 228, the 9th resonator 229, wherein it is logical to be located at main coupling
First filtering cavity 211 of road head and the tail two sides and the 9th filtering cavity 219 are separately connected input terminal and output end, and are equipped with coupling
Tap 230.
The circuit realization principle figure of Fig. 4 the application anti-interference filter is please referred to, it is wherein real in S1~S9 corresponding diagram 2
First resonator of body~the 9th resonator 221~229, window or coupling control member in R1~R13 corresponding diagram 2 in entity
Part, the tap 201 and 202 of input terminal and output end in R0 corresponding diagram 2 in entity, wherein generate zero in the position of R9~R13
Point.In the present embodiment, the first resonator 221, the second resonator 222, third resonator 223, the 4th resonator 224 composition the
One concatenation unit, wherein the first resonator 221 and the non-adjacent third resonator 223 across level-one and across two-stage
4th resonator 224 is of coupled connections respectively, between the first resonator 221 and third resonator 223 and the first resonator 221
It is respectively provided between the 4th resonator 224 and couples control element；Sixth resonator 226, the 7th resonator 227, the 8th is humorous
Shake device 228, the 9th resonator 229 forms the second concatenation unit, wherein the 9th resonator 229 is with non-adjacent across the of level-one
Seven resonators 227 and the sixth resonator 226 for crossing over two-stage are of coupled connections respectively, the 9th resonator 229 and seven resonators
It is respectively provided between 227 and between the 9th resonator 229 and sixth resonator 226 and couples control element.First order receipts or other documents in duplicate
4th resonator 224 of the member and sixth resonator 226 of the second concatenation unit is coupled to each other connects and at the same time respectively with the 5th
Resonator 225 is of coupled connections.
Specific the filtering cavity is arranged in two rows and the arrangement that misplaces up and down as shown in Figures 2 and 3, filter that there are four uplinks
Wave cavity, downlink is there are five filtering cavity, and each filtering cavity is in pentagon in terms of illustrated angle, upper and lower two row filter cavity it
Between connection boundary be in W type structure, and each filtering cavity of uplink and the two neighboring filtering cavity of downlink are immediately.As schemed
Show, the lower end side Liang Ge of the first filtering cavity 211 of uplink adjacent with downlink the second filtering cavity 212, third filtering respectively
One side of cavity 213 shares, and filters the connection that intercouples between cavity, remaining uplink filters cavity and downstream filtering
Same structure relationship is also presented in cavity.What is referred in the application is upper and lower or left and right, only for convenience of description according to attached drawing
It is shown to illustrate, it is possible to understand that the filtering cavity in the application is stereochemical structure, in the position that different direction of observations are seen
For the relative direction of relationship then with difference as shown in the figure, the direction mentioned in the application is not intended as the limitation of the application range.
And window is offered between the adjacent resonators of main coupling channel, the window is equipped with frequency modulation screw rod 203.The
Between one resonator 221 and the 4th resonator 224, between third resonator 223 and the 4th resonator 224, the 4th resonator 224
Between the 5th resonator 225, between the 5th resonator 225 and sixth resonator 226, sixth resonator 226 and the 7th resonance
It between device 227, is respectively equipped between sixth resonator 226 and the 9th resonator 229 and couples muscle 204, and couple 204 top of muscle
Equipped with frequency modulation screw rod 203；Between first resonator 221 and third resonator 223, the 4th resonator 224 and sixth resonator 226
Between, winged bar 205 is respectively equipped between the 7th resonator 227 and the 9th resonator 229, the winged bar 205 passes through filtering cavity
Between the perforation 206 that is arranged on side wall.First resonator 221 connects input terminal tap 201, the connection output of the 9th resonator 229
Hold tap 202.
Fig. 2~5 are please referred to, the relationship that is of coupled connections between nine in the present embodiment filtering cavity is integrally in
It is symmetrical.Such as Fig. 5, shown in the circuit topology figure of the application anti-interference filter, in main coupling channel, the resonator of head and the tail
Between based on capacitive coupling, wherein between first resonator 221 and the second resonator 222, the second resonator 222 and
Between three resonators 223 and between the 9th resonator 229 and the 8th resonator 228, the 8th resonator 228 and the 7th resonance
It is capacitive coupling between device 227, major way is to open up window and setting frequency modulation screw rod 203；Between the resonator of middle section
Based on inductive coupled, between the third resonator 223 and the 4th resonator 224, the 4th resonator 224 and the 5th resonator
Between 225, between the 5th resonator 225 and sixth resonator 226, between sixth resonator 226 and the 7th resonator 227 for sense
Property coupling, window is arranged and on the basis of frequency modulation screw rod, is provided with coupling muscle 204 between these resonators to realize perception
Coupling.
Fig. 2 and Fig. 5 are please referred to, it is humorous in the first resonator 221, the second resonator 222, third resonator the 223, the 4th
It shakes in the first concatenation unit that device 224 forms, the first resonator 221 crosses over the third resonance of level-one with being in main coupling channel
Capacitive connection is realized between device 223, major way is to be arranged to fly bar 205, in entity structure, as shown in Fig. 2, the first filtering chamber
Immediately with third filtering cavity 213, which is arranged between the first resonator 221 and third resonator 223 flies 211 lower section of body
Bar 205 provides basis, opens up perforation 206 on the side wall between the first filtering cavity 211 and third filtering cavity 213, flies bar 205
Pass through 206 first resonator of connection 221 of perforation and third resonator 223.First resonator 221 be in main coupling channel
Between middle the 4th resonator 224 across two-stage realize perception connection, in entity structure, it is described first filtering cavity 211 with
Immediately, window and tune is arranged between the first filtering cavity 211 and the 4th filtering cavity 214 in the 4th filtering cavity 224 on side
Frequency screw rod, and setting coupling muscle 204 is inductive coupled to realize between the first resonator 221 and the 4th resonator 224.
The second level being made of sixth resonator 226, the 7th resonator 227, the 8th resonator 228, the 9th resonator 229
Receipts or other documents in duplicate member, the relationship that is of coupled connections and the first concatenation unit are symmetrical arranged, wherein the 9th resonator 229 be in main coupling channel
Capacitive connection is realized between middle the 7th resonator 227 across level-one, the 9th resonator 229 is crossed over in main coupling channel
Perception connection is realized between the sixth resonator 226 of two-stage.
Between first concatenation unit and the second concatenation unit, in addition to coupling between the 4th resonator 224 and sixth resonator 226
Conjunction is connected with except the 5th resonator 225, is connected between the 4th resonator 224 and sixth resonator 226 across level-one direct-coupling
It connects, opens up perforation 206 on the side wall between cavity 216 by filtering in the 4th filtering cavity 214 and the 6th, and setting passes through
The winged bar 205 of the perforation 206 connects the 4th resonator 224 and realizes that capacitive coupling is connect with sixth resonator 226.
Referring to Fig. 3, the application further comprises shell 300, the outside of the filtering cavity of the anti-interference filter with
Interval 301 is equipped between the shell of anti-interference filter.It is equivalent between having added a moat between filtering cavity and shell
Every so that structure is more stable, index performance is more stable, and design is simple, and assembling and setting is simple, reduces cost, improves production efficiency.
Side wall is equipped with concave inward structure above the filtering cavity of the uplink of anti-interference filter described in embodiment as shown in the figure,
To the interval 301 formed between the shell of the anti-interference filter.The concave inward structure is above two filtering cavitys
Side wall setting.
The application also provides a kind of communication equipment comprising anti-interference filter as described above.The application filter is convenient for
While the operations such as transport, installation, disassembly, be conducive to cavity body filter and be integrated into relevant communication equipment or device, guarantees
The normal operation of entire communication system.
Referring to Fig. 6, the anti-interference filter of the application uses bandpass filter, filtering cavity sorts along main coupling channel
Design, in conjunction with across the grade coupling between non-adjacent resonators, compared to the more conventional quarter-wave long pass according to resonance frequency
For the bandstop filter of defeated line design, with less resonant cavity, less transmission zero, the application can pass through 9 chamber, 5 zero point
Design of Bandpass be properly arrived at the required index impact of performance, such as the following table 1 the application anti-interference filter design objective
Shown by performance parameter.
1 the application anti-interference filter design objective performance parameter of table
The application consistency is good, and circuit structure is simple, and structure designs simplerization, miniaturization, reduces cavity filtering
The volume of device reduces cavity weight, and material is reduced, and cavity design occupies little space, and makes to produce the reduction of cavity body filter materials, drop
Low production cost, improves productivity effect.In whole structure design, resonator and entire cavity couple control element
The machining accuracy and assembly precision of equal devices (tap flies bar etc.) are all easy to reality in existing processing conditions and production environment
It is existing, it can achieve required insertion loss, required Q value, index is functional, considerably reduces the whole body of cavity body filter
Product.Assembly technology is simple, while the operation such as being readily transported, install, dismantling, be conducive to cavity body filter be integrated into it is relevant logical
Believe in device, guarantees the normal operation of entire communication system.
The foregoing is merely presently filed embodiments, are not intended to limit the scope of the patents of the application, all to utilize this
Equivalent structure or equivalent flow shift made by application specification and accompanying drawing content, it is relevant to be applied directly or indirectly in other
Technical field similarly includes in the scope of patent protection of the application.
Claims (10)
1. a kind of anti-interference filter, which is characterized in that it includes the filtering cavity that several connections form main coupling channel, filter
Resonator is equipped in wave cavity, wherein the resonator of two filtering cavitys of head and the tail is separately connected input terminal and output end, along main coupling
It closes in the harmonic wave cavity that channel is sorted, the grade receipts or other documents in duplicate being connected to each other between the resonator that there is at least one set of non-adjacent harmonic wave cavity
Member, it is described at least one set concatenation unit in non-adjacent harmonic wave cavity resonator between be equipped with coupling control element, it is described extremely
It is at least connected across level-one between the non-adjacent resonators of few one group of concatenation unit.
2. anti-interference filter according to claim 1, which is characterized in that the anti-interference filter is equipped with described in nine
Cavity is filtered, the relationship that is of coupled connections between the resonator of the harmonic wave cavity is integrally symmetric along main coupling channel.
3. anti-interference filter according to claim 2, which is characterized in that along the harmonic wave cavity of main coupling channel sequence
In, symmetrical there are two the concatenation unit for being separately connected input terminal and output end, each concatenation unit includes four filters
The resonator of wave cavity, connect in the concatenation unit resonator of the first filtering cavity of input terminal or output end with it is non-adjacent
Two resonators by couple control element be of coupled connections.
4. anti-interference filter according to claim 3, which is characterized in that the end filtering in two concatenation units
The resonator of cavity is of coupled connections by coupling control element.
5. anti-interference filter according to claim 4, which is characterized in that the coupling control element is that capacitive intersects coupling
Control element or perceptual cross-coupling control element are closed, wherein being of coupled connections as capacitive coupling connection, the coupling across level-one
Conjunction control element is capacitive cross coupling control element；Across being of coupled connections as inductive coupled connection, the coupling control for two-stage
Element processed is perceptual cross-coupling control element.
6. anti-interference filter according to claim 5, which is characterized in that the capacitive cross coupling control element uses
Fly bar, the perception cross-coupling control element will use dowel.
7. according to the described in any item anti-interference filters of claim 2~6, which is characterized in that in the filtering cavity arrangement
Lower two rows and the arrangement that misplaces, and each filtering cavity of uplink is adjacent with two filtering cavitys of downlink.
8. anti-interference filter according to claim 7, which is characterized in that offered between the filtering cavity for arranging adjacent
Window, the window are equipped with frequency modulation screw rod.
9. anti-interference filter according to claim 7, which is characterized in that it further comprises shell, described anti-interference
Interval is equipped between the outside of filtering cavity and the shell of anti-interference filter of filter.
10. a kind of communication equipment, which is characterized in that it includes the anti-interference filter as described in any one of claim 1~9.
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| CN201920198485.8U CN209374645U (en) | 2019-02-14 | 2019-02-14 | Anti-interference filter and communication equipment |
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| CN111130487A (en) * | 2020-01-15 | 2020-05-08 | 深圳振华富电子有限公司 | Bandpass filter and its circuit |
| CN113036371A (en) * | 2019-12-25 | 2021-06-25 | 深圳市大富科技股份有限公司 | Filter and communication equipment |
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Address after: 233000 building 4, national financial incubation Industrial Park, 17 Yannan Road, high tech Zone, Bengbu City, Anhui Province Patentee after: Dafu Technology (Anhui) Co., Ltd Address before: 518104, Guangdong, Shenzhen province Baoan District manhole street, oyster Road, manhole Industrial Company Third Industrial Zone, A1, A2, A3 101, A4 first, second, third layers Patentee before: SHENZHEN TATFOOK TECHNOLOGY Co.,Ltd. |
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