CN104157951B - The manufacture method of communication base station waveguide filter - Google Patents
The manufacture method of communication base station waveguide filter Download PDFInfo
- Publication number
- CN104157951B CN104157951B CN201410422614.9A CN201410422614A CN104157951B CN 104157951 B CN104157951 B CN 104157951B CN 201410422614 A CN201410422614 A CN 201410422614A CN 104157951 B CN104157951 B CN 104157951B
- Authority
- CN
- China
- Prior art keywords
- powder
- cavity
- base station
- manufacture method
- dielectric resonator
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Abstract
The present invention discloses the manufacture method of a kind of communication base station waveguide filter, comprises the following steps: step one, aluminium oxide, calcium carbonate, lanthana, Disamarium trioxide are uniformly mixed acquisition mixed powder；Step 2, the mixed powder of step one, water and ball are mixed according to 1:1.2:2 ratio, after transit mixer continuous stirring 3 ~ 5 hours uniformly mixing, obtaining the powder after drying through baking oven；Step 3, in granulation tower will dry after powder, glue, releasing agent and dispersant according to 100:10:2:0.7 weight part ratio carry out pelletize obtain powder granule；Step 4, be sufficiently stirred for described powder granule after leach stirring ball after, in the baking oven of 100 DEG C obtain dry after powder granule；Step 5, density 2.25 ~ 2.32g/cm base substrate will be shaped to through hydraulic press after mixed powder mist projection granulating.The present invention has high q-factor, small size, temperature coefficient adjustable, and product structure reliability is high；And cavity and dielectric resonator thermal coefficient of expansion concordance good.
Description
Technical field
The present invention relates to the manufacture method of a kind of wave filter, belong to reciprocity microwave device field.
Background technology
Wave filter is widely used in the communications field as a kind of frequency selection device, especially field of radio frequency communication.Completing signal in communication system to launch with the base station received, wave filter is used for selecting signal of communication, filters the clutter outside communication signal frequency or interference signal.Existing in mobile communication base station system, it is common to use antenna is launched by cavity body filter and the signal of reception carries out frequency selection.Traditional cavity body filter or dielectric cavity fluid filter, it it is all the material using the aluminiums such as AL6061 to be used as cavity, when this makes dielectric cavity fluid filter realize, also exist owing to also existing than more serious integrity problem when aluminium welds as the resonator that metalwork and dielectric material are made.Therefore, how to design a kind of high q-factor dielectric filter and have high q-factor, small size, temperature coefficient adjustable, product structure reliability is high, and cavity and the manufacture method of the good wave filter of dielectric resonator thermal coefficient of expansion concordance；Become the direction that those of ordinary skill in the art make great efforts.
Summary of the invention
It is an object of the present invention to provide the manufacture method of a kind of communication base station waveguide filter, this manufacture method obtains communication base station waveguide filter and has high q-factor, small size, temperature coefficient adjustable, and product structure reliability is high；And cavity and dielectric resonator thermal coefficient of expansion concordance good.
For reaching above-mentioned purpose, the technical solution used in the present invention is: the manufacture method of a kind of communication base station waveguide filter, and including cavity and dielectric resonator, described dielectric resonator is the cylinder with through hole；Described dielectric resonator is made up of the component of following masses percentage composition: calcium carbonate 29 ~ 32%, aluminium oxide 9 ~ 11%, Dineodymium trioxide 21 ~ 25% and titanium dioxide 35 ~ 38%；Comprise the following steps:
Step one, the uniformly mixing of aluminium oxide 95 ~ 96%, calcium carbonate 2 ~ 3%, lanthana 0.8 ~ 1.5%, Disamarium trioxide 0.2 ~ 0.5% is obtained mixed powder；
Step 2, the mixed powder of step one, water and ball are mixed according to 1:1.2:2 ratio, after transit mixer continuous stirring 3 ~ 5 hours uniformly mixing, obtaining the powder after drying through baking oven；
Step 3, in granulation tower will dry after powder, glue, releasing agent and dispersant according to 100:10:2:0.7 weight part ratio carry out pelletize obtain powder granule, this powder granule diameter≤0.5um；
Step 4, be sufficiently stirred for described powder granule after leach stirring ball after, in the baking oven of 100 DEG C obtain dry after powder granule；
Step 5, density 2.25 ~ 2.32g/cm base substrate will be shaped to through hydraulic press after mixed powder mist projection granulating；
Step 6, with 110 DEG C/h ramp to 800 DEG C, then with 300 DEG C/h ramp to 1350 DEG C, after being incubated 1.5 hours, then be down to 1000 DEG C with 200 DEG C/h rate of temperature fall, then be cooled to 500 DEG C, then Chang Leng with 700 ~ 730 DEG C/h speed；
Step 7, cover a metal level at described cavity inner wall.
Further improved plan in technique scheme is as follows:
1, in such scheme, described cavity inner wall surface roughness is about 0.8.
2, in such scheme, described cavity inner wall is covered with metal level and is realized by the technique of sputtering or electroless plating.
Owing to technique scheme is used, the present invention compared with prior art has the advantage that
1, manufacture method of the present invention obtains communication base station waveguide filter, its high q-factor, small size, accompanying drawing 5-6 gives electric field and the Distribution of Magnetic Field of TM, give simultaneously 3D electromagnetism scattergram in Ansoft threedimensional FEM software to checking, as accompanying drawing can be seen that, TM is the dielectric resonator of main mould, magnetic field is the concentric circular with the central shaft of dielectric resonator as the center of circle, its electric field is parallel to the parallel lines of dielectric resonator, compared with the resonator of metal material, the magnetic field of TM mould is the most more concentrated, and electric field is stronger in top of media and bottom, the strongest at the center of medium.In other words, owing to the field of TM mould is more concentrated in medium, thus Q-value is more much higher than metal resonators, low with filter loss that TM is main mould, frequency characteristic is more precipitous, is especially applicable to the agitator of TM mould, has the widest tuning range, good temp characteristic, volume is little, reliability is high.
2, manufacture method of the present invention obtains communication base station waveguide filter, and having broader tuning range, the magnetic field of TM mould dielectric resonator is the concentric circular with the central shaft of dielectric resonator as the center of circle, and its electric field is parallel to the parallel lines of dielectric resonator.When being applied to TM Mould Breadth band tunable oscillator, device (field effect transistor or Geng Shiguan) is placed in centre bore, the field of excitation TM mould, in actual oscillating structure, field effect transistor is fixed on the can of agitator, has the most both made grounded drain, can move up and down again, regulation pipe and the degree of coupling of dielectric resonator, easily.In order to realize oscillator tuning, can be moved up and down by tuner, both can complete frequency tuning, the output coupling of resonator can use loop coupling or probe coupling.Experimental data proves, this resonator is under assigned frequency, and tuning range is up to 7%～the general tuning range of 10%.TE mould resonator is 3%～4%.
3, manufacture method of the present invention obtains communication base station waveguide filter, its temperature coefficient adjustable, wave filter and the duplexer cavity resonator of base station radio-frequency part mostly uses silver plated metals coaxial cavity at present, due to the Q-value of this coaxial cavity limited (Qu is about 3500), and resonant frequency temperature stability is very poor, and the cavity that the TM mould dielectric resonator made of the ceramic material that relative dielectric constant is 45 that the present invention uses and alumina ceramic material that relative dielectric constant is 9.5 are fabricated to.By adding a small amount of rare earth element in material prescription, temperature coefficient is made to may be adjusted within the specific limits unanimously.Whole dielectric cavity fluid filter is made to have extraordinary tuneable temperature coefficient.
4, the manufacture method of communication base station waveguide filter of the present invention, high welding reliability, current TM dielectric cavity fluid filter is all the cavity being fabricated to aluminium alloy, this kind of cavity metal material, when welding with TM mould dielectric resonator, difference due to storeroom temperature performance, after causing high-temperature soldering cooling, Material shrinkage ratio is inconsistent, and make originally be welded on variations in temperature after destroyed, so that properties of product are destroyed, and use aluminium oxide cavity, owing to aluminium oxide itself is also media ceramic, temperature coefficient adjustable becomes with TM mould resonator is consistent, so there is more preferable reliability after welding, the situation that can avoid damaged fracture occurs.
5, the manufacture method of communication base station waveguide filter of the present invention, itself limitation due to tradition machining cavity, Q-value can only achieve 6500 ~ 7000, but this cavity forming mould uses whole mirror finishes to process and the factor such as the uniform fine particle of alumina powder and the large-scale powder hydraulic press device of employing, so its surface roughness can reach about 0.8, therefore the Q-value of product can be made to rise to more than 7000 with regard to cavity reason.
6, the manufacture method of communication base station waveguide filter of the present invention, the material that this cavity uses is alumina ceramic powder, and the market price is low, only uses about the half of aluminium price.This cavity uses mould compressing, is suitable for batch production.Because using mold polish to process, making the surface roughness of this cavity be significantly better than tradition cavity, electroplating cost is greatly lowered.This cavity is greatly promoted with the yields of welding of dielectric resonator.Significantly decline so that the cost of whole product has, more have the market advantage.
Accompanying drawing explanation
Accompanying drawing 1 is communication base station waveguide filter structural representation of the present invention；
Accompanying drawing 2 is cavity of the present invention sintering temperature-time diagram；
Accompanying drawing 3 is present media resonator structure schematic diagram；
Accompanying drawing 4 is cavity of the present invention and dielectric resonator structural representation；
Accompanying drawing 5 is the 3D distribution map of the electric field in Ansoft threedimensional FEM software of the present invention；
Accompanying drawing 6 is the 3D Distribution of Magnetic Field figure in Ansoft threedimensional FEM software of the present invention.
In the figures above: 1, cavity；2, dielectric resonator；3, through hole；4, cylinder；5, silver layer.
Detailed description of the invention
Below in conjunction with the accompanying drawings and embodiment the invention will be further described:
Embodiment 1 ~ 3: the manufacture method of a kind of communication base station waveguide filter, including cavity 1 and dielectric resonator 2, described dielectric resonator is the cylinder 4 with through hole 3；Described dielectric resonator 2 is formed as shown in table 1 by the component of following masses percentage composition:
Table 1
Described dielectric resonator 2 one end is plated with silver layer 5, and this dielectric resonator 2 other end is welded in cavity 1；
Described cavity 1 is as shown in table 2 by the component of following masses percentage composition:
Table 2
Described cavity 1 relative dielectric constant is 9.5.
Above-mentioned dielectric resonator 2 is made up of the component of following masses percentage composition:
The calcium carbonate of purity 97.5%
30.5%,
The aluminium oxide of purity 97.5%
10%,
The Dineodymium trioxide of purity 99.5%
23%,
The titanium dioxide of purity 99.6%
36.5%。
Above-mentioned cavity 1 inner wall surface roughness is about 0.8.
Above-mentioned cavity 1 obtains through following technique:
Step one, the uniformly mixing of aluminium oxide 95 ~ 96%, calcium carbonate 2 ~ 3%, lanthana 0.8 ~ 1.5%, Disamarium trioxide 0.2 ~ 0.5% is obtained mixed powder；
Step 2, density 2.25 ~ 2.32g/cm base substrate will be shaped to through hydraulic press after mixed powder mist projection granulating；
Step 3, with 110 DEG C/h ramp to 800 DEG C, then with 300 DEG C/h ramp to 1350 DEG C, after being incubated 1.5 hours, then be down to 1000 DEG C with 200 DEG C/h rate of temperature fall, then be cooled to 500 DEG C, then Chang Leng with 700 ~ 730 DEG C/h speed；
Step 4, cover a metal level at described cavity 1 inwall.
Between above-mentioned steps one and step 2 further comprising the steps of:
Step 1, the mixed powder of step one, water and ball are mixed according to 1:1.2:2 ratio, after transit mixer continuous stirring 3 ~ 5 hours uniformly mixing, obtaining the powder after drying through baking oven；
Step 2, in granulation tower will dry after powder, glue, releasing agent and dispersant according to 100:10:2:0.7 weight part ratio carry out pelletize obtain powder granule, this powder granule diameter≤0.5um；
Step 3, be sufficiently stirred for described powder granule after leach stirring ball after, in the baking oven of 100 DEG C obtain dry after powder granule.
Above-mentioned cavity 1 inwall is covered with metal level and is realized by the technique of sputtering or electroless plating.
The performance of comparative example is as shown in table 3:
Table 3
| Type | Insertion loss | Temperature drift | Q-value | Reliability | |
| Comparative example 1 | Wire chamber+metal resonators | ≤0.8 | ≤10ppm | 5000 | Performance is affected by environment bigger |
| Comparative example 2 | Wire chamber+dielectric resonator | ≤0.6 | ≤5ppm | 6000 | Performance is affected by environment less |
| The present invention | Aluminium oxide chamber+dielectric resonator | ≤0.48 | ≤3ppm | 7000 | Performance is affected by environment the least |
The further content of above-described embodiment is described below.
1, in the metallization mould frequency characteristic of aluminium oxide ceramics intracavity and architectural characteristic, the method for designing attempting utilizing theoretical formula method to combine with Ansoft threedimensional FEM according to media ceramic 4G communication TM mould dielectric resonator and dielectric cavity fluid filter are emulated and designed.
2, by adding the thermal coefficient of expansion that the rare earth element of specific components and content adjusts the thermal coefficient of expansion resonator material of alumina material in formula, the thermal coefficient of expansion making the two reaches unanimity, it is ensured that by the reliability of improving product in the case of temperature shock after the dielectric resonator that is welded.
3, improve the ion degree of order in material by the heating curve optimized and slow cooling technique, make Q-value increase substantially.
4, the high temperature sintering of aluminium oxide cavity, the high temperature sintering curve of See Figure.After aluminum cavity to be oxidized sinters, the mode of leaching silver or electroless plating is used to make aluminium oxide cavity realize surface metalation.
5, by slow cooling slow thermal weld technique in the installation process of resonator and aluminium oxide cavity, improve the flatness of soldering paste, thawings degree, eliminate device and install and rupture probability under high/low temperature working condition.
Preparation method is as follows:
1, this project is by the research affected the selection of mould field, the mould frequency characteristic of TM mould and the architectural characteristic of resonator own of dielectric resonator to the characteristic of TM mould, and key technology is set up 3D electromagnetic model by the method for designing using Theoretical Calculation to combine with Ansoft threedimensional FEM.Predict Electric Field Distribution form and the Distribution of Magnetic Field form of resonator, it is determined that affect dielectric resonator mould field select, a series of key factors of frequency characteristic, successfully obtain mid frequency 2350MHZ, Q:7000min, TM mould dielectric resonator.Test single-chamber φ 37 × 33 such as Fig. 6.Less than the TE mould dielectric resonator volume of same frequency nearly half, tuning range is big one times, mode separation is more preferable, does not has parasitic mode in the stopband of octave.
2, by adding the oxide such as small amounts samarium and titanium dioxide in aluminium oxide formula, improve the microstructure of sintered sample, successfully prevent the reduction of appraising at the current rate of Ti.Making the thermal coefficient of expansion after aluminium oxide cavity sintering reach 5 ~ 6PPm/ DEG C, frequency-temperature coefficient is-2～-4 PPm/ DEG C
3, the dielectric material of resonator Samarium Nitrate sm of particular combination and content in formula, the compound interpolation of iridium Y, lanthanum La, makes mould resonant Q value reach 7000, frequency-temperature coefficient+2 ~+4 PPm/ DEG C, and thermal coefficient of expansion also reaches 5 ~ 6 PPm/ DEG C.
4, in dry pressuring forming process, have employed the two-way self-pressurization of high sophisticated technology in a set of current die industry and take out punch die, big pressure, in the case of complex appearance, one-shot forming, and take out hole under the pressure of pressurize 5000KN.Decrease the internal stress of structure, solve sintering warpage and the inconsistent industry difficult problem of shrinkage factor, for the aluminium oxide cavity after molding and firing processes.
Above-described embodiment only for technology design and the feature of the present invention are described, its object is to allow person skilled in the art will appreciate that present disclosure and to implement according to this, can not limit the scope of the invention with this.All equivalence changes made according to spirit of the invention or modification, all should contain within protection scope of the present invention.
Claims (3)
1. the manufacture method of a communication base station waveguide filter, it is characterised in that: including cavity (1) and dielectric resonator (2), described dielectric resonator is the cylinder (4) with through hole (3)；Described dielectric resonator (2) is made up of the component of following masses percentage composition: calcium carbonate 29 ~ 32%, aluminium oxide 9 ~ 11%, Dineodymium trioxide 21 ~ 25% and titanium dioxide 35 ~ 38%；Described cavity (1)
Obtained by following steps:
Step one, the uniformly mixing of aluminium oxide 95 ~ 96%, calcium carbonate 2 ~ 3%, lanthana 0.8 ~ 1.5%, Disamarium trioxide 0.2 ~ 0.5% is obtained mixed powder；
Step 2, the mixed powder of step one, water and ball are mixed according to 1:1.2:2 ratio, after transit mixer continuous stirring 3 ~ 5 hours uniformly mixing, obtaining the powder after drying through baking oven；
Step 3, in granulation tower will dry after powder, glue, releasing agent and dispersant according to 100:10:2:0.7 weight part ratio carry out pelletize obtain powder granule, this powder granule diameter≤0.5um；
Step 4, be sufficiently stirred for described powder granule after leach stirring ball after, in the baking oven of 100 DEG C obtain dry after powder granule；
Step 5, density 2.25 ~ 2.32g/cm base substrate will be shaped to through hydraulic press after powder granule mist projection granulating；
Step 6, with 110 DEG C/h ramp to 800 DEG C, then with 300 DEG C/h ramp to 1350 DEG C, after being incubated 1.5 hours, then be down to 1000 DEG C with 200 DEG C/h rate of temperature fall, then be cooled to 500 DEG C, then Chang Leng with 700 ~ 730 DEG C/h speed；
Step 7, cover a metal level at described cavity (1) inwall.
The manufacture method of communication base station waveguide filter the most according to claim 1, it is characterised in that: described cavity (1) inwall is covered with metal level and is realized by the technique of sputtering or electroless plating.
The manufacture method of communication base station waveguide filter the most according to claim 1, it is characterised in that: described cavity (1) inner wall surface roughness is about 0.8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410422614.9A CN104157951B (en) | 2012-11-27 | 2012-11-27 | The manufacture method of communication base station waveguide filter |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410422614.9A CN104157951B (en) | 2012-11-27 | 2012-11-27 | The manufacture method of communication base station waveguide filter |
| CN201210492253.6A CN102969549B (en) | 2012-11-27 | 2012-11-27 | Novel medium cavity filter with cavity |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210492253.6A Division CN102969549B (en) | 2012-11-27 | 2012-11-27 | Novel medium cavity filter with cavity |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104157951A CN104157951A (en) | 2014-11-19 |
| CN104157951B true CN104157951B (en) | 2016-08-17 |
Family
ID=51883399
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410422614.9A Active CN104157951B (en) | 2012-11-27 | 2012-11-27 | The manufacture method of communication base station waveguide filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104157951B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112928478B (en) * | 2021-01-25 | 2022-07-29 | 电子科技大学 | Wide-beam stepped dielectric resonator antenna based on high-order mode superposition |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000007429A (en) * | 1998-06-16 | 2000-01-11 | Ngk Spark Plug Co Ltd | Dielectric material and its production |
| US6107227A (en) * | 1998-08-03 | 2000-08-22 | Cts Corporation | Barium neodymium titanate dielectric ceramic composition incorporating samarium oxide for improved electrical performance |
| CN1254453C (en) * | 2001-08-09 | 2006-05-03 | 大里齐 | Microwave dielectric composite composition |
| CN1252736C (en) * | 2001-11-29 | 2006-04-19 | 松下电器产业株式会社 | Piezoelectric ceramic composition and piezoelectric element utilizing with the same |
| JP2003212649A (en) * | 2002-01-16 | 2003-07-30 | Murata Mfg Co Ltd | Dielectric porcelain for high-frequency region, dielectric resonator, dielectric filter, dielectric duplexer and transmitter device |
| JP3930814B2 (en) * | 2003-01-24 | 2007-06-13 | Ｔｄｋ株式会社 | Composite dielectric material and substrate |
| CN101555135A (en) * | 2009-05-05 | 2009-10-14 | 张家港保税区灿勤科技有限公司 | Microwave medium ceramic material with ultrahigh Q-value middle dielectric constant |
| CN101800348A (en) * | 2010-04-01 | 2010-08-11 | 张家港保税区灿勤科技有限公司 | TM membrane dielectric resonator |
| CN101834338B (en) * | 2010-04-22 | 2013-01-02 | 张家港保税区灿勤科技有限公司 | TM (Transverse Magnetic) mode dielectric resonator for controlling second harmonic migration |
-
2012
- 2012-11-27 CN CN201410422614.9A patent/CN104157951B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN104157951A (en) | 2014-11-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102969549B (en) | Novel medium cavity filter with cavity | |
| Jin et al. | Boosting densification and microwave dielectric properties in cold sintered BaF2 ceramics for 5.8 GHz WLAN applications | |
| CN104692795A (en) | Ultra-low-loss lithium magnesium titanate microwave dielectric ceramic material and preparation method thereof | |
| WO2012122922A1 (en) | Method for manufacturing resonance tube, resonance tube and filter | |
| CN112876251A (en) | High-performance low-dielectric microwave ceramic prepared based on cold sintering technology and method | |
| CN111548148A (en) | Microwave dielectric porcelain, preparation method and application | |
| CN113149645B (en) | Low-temperature sintering temperature stable composite microwave dielectric ceramic and preparation method thereof | |
| CN111517789B (en) | Low-dielectric microwave dielectric ceramic material and preparation method thereof | |
| CN111499372A (en) | Low-temperature energy-saving preparation of L iMgPO4Method for microwave ceramic material | |
| CN104671773B (en) | A kind of low dielectric constant microwave dielectric ceramic material and preparation method thereof | |
| CN108585809B (en) | Low-temperature sintered SiO2Microwave-based dielectric ceramic material and preparation method thereof | |
| CN104157951B (en) | The manufacture method of communication base station waveguide filter | |
| CN110818419B (en) | Microwave dielectric ceramic LiF and preparation method thereof | |
| CN103449820B (en) | Method for reducing sintering temperature of calcium zirconate microwave dielectric ceramic | |
| CN110885243B (en) | Low-dielectric-constant aluminate microwave dielectric ceramic material and preparation method thereof | |
| CN111548145A (en) | Injection molding method of microwave dielectric ceramic filter and ceramic filter thereof | |
| CN104193336A (en) | Low-sintering-temperature microwave dielectric ceramic material and preparation method thereof | |
| CN114163241B (en) | High-performance low-dielectric microwave dielectric ceramic prepared by low-temperature hot pressing and method thereof | |
| CN104157950B (en) | Manufacturing process for adjustable cavity filter | |
| CN110845226A (en) | Microwave dielectric ceramic material SrGa2O4And method for preparing the same | |
| CN104710175A (en) | Low-dielectric-constant lithium magnesium zirconate microwave dielectric ceramic material and preparation method thereof | |
| CN104600412B (en) | Microwave dielectric resonator | |
| CN101265097B (en) | Low-temperature sintering composite microwave medium ceramic and preparation method thereof | |
| CN108751983A (en) | Microwave ceramics medium and preparation method thereof for high-frequency ceramic capacitor | |
| CN104761258A (en) | Method of low-temperature sintering calcium zirconate microwave dielectric ceramic |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: 215633 Jiangsu Canqin Technology Co., Ltd. No. 19 Jingang Road, Zhangjiagang Bonded Zone, Suzhou City, Jiangsu Province Patentee after: Jiangsu Canqin Science and Technology Co., Ltd. Address before: 215633 No. 19 Jingang Road, Zhangjiagang Bonded Zone, Suzhou City, Jiangsu Province Patentee before: Zhangjiagang Bonded Area Canqin Technology Co., Ltd. |