CN104103913B - Small-sized plane reversed F loading array antenna - Google Patents
Small-sized plane reversed F loading array antenna Download PDFInfo
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- CN104103913B CN104103913B CN201410274578.6A CN201410274578A CN104103913B CN 104103913 B CN104103913 B CN 104103913B CN 201410274578 A CN201410274578 A CN 201410274578A CN 104103913 B CN104103913 B CN 104103913B
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- 229910052751 metal Inorganic materials 0.000 claims abstract description 83
- 239000002184 metal Substances 0.000 claims abstract description 83
- 230000005855 radiation Effects 0.000 claims abstract description 30
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims description 19
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 7
- 229910052802 copper Inorganic materials 0.000 claims description 7
- 239000010949 copper Substances 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 6
- 150000002739 metals Chemical class 0.000 claims description 5
- 239000011152 fibreglass Substances 0.000 claims description 4
- 239000004411 aluminium Substances 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 2
- 229910052760 oxygen Inorganic materials 0.000 claims description 2
- 239000001301 oxygen Substances 0.000 claims description 2
- 230000008878 coupling Effects 0.000 abstract description 7
- 238000010168 coupling process Methods 0.000 abstract description 7
- 238000005859 coupling reaction Methods 0.000 abstract description 7
- 238000010586 diagram Methods 0.000 description 19
- 238000012913 prioritisation Methods 0.000 description 8
- 238000004891 communication Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 239000004593 Epoxy Substances 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000004020 conductor Substances 0.000 description 1
- 230000001808 coupling effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000009740 moulding (composite fabrication) Methods 0.000 description 1
- 239000000546 pharmaceutical excipient Substances 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
Landscapes
- Variable-Direction Aerials And Aerial Arrays (AREA)
- Waveguide Aerials (AREA)
Abstract
The invention discloses a small-sized plane reversed F loading array antenna which comprises an antenna housing, a metal plate, a base, four plane reversed F antennas, a central loading body and four passive metal decoupling modules, wherein the metal plate clings to the upper surface of the base; the antenna housing is fixed on the base; the four plane reversed F antennas are uniformly distributed on the upper surface of the metal plate to form a square plane reversed F antenna array; and the central loading body is located in the center of the square plane reversed F antenna array, and connected with the upper surface of the metal plate. According to the antenna, the central loading body, namely a passive metal body or a central loading plane reversed F antenna, is arranged in the center of the square plane reversed F antenna array to broaden the bandwidth of the antenna; the passive metal decoupling modules are uniformly added between the plane reversed F antennas to weaken coupling; the antenna achieves switching of two radiation modes, namely directional 90-degree beam scanning and omnidirectional 360-degree beam scanning, within a wider frequency range; the antenna is high in efficiency, and stable and simple in structure; and the size of the antenna is reduced.
Description
Technical field
The present invention relates to field of array antennas, particularly small-sized plane inverted f array of loading antenna.
Background technology
Antenna can use, in occupation of nothing, the status substituting in aircraft communications system always, in airborne communication system, often
Need antenna to have special directional diagram to meet the needs of particular job, and array antenna technique passes through to control aerial radiation list
The arrangement of unit, the amplitude of antenna radiation unit, PHASE DISTRIBUTION can conveniently realize antenna beam excipient and obtain high power, height
The characteristic of gain.Aircraft antenna is limited by high altitude environment, and the size of antenna is little, and section is low, and needs to meet polarization
With requirement on electric performance such as directional diagrams.The design of traditional airborne array antenna is stitched frequently with line style/planar microstrip array or waveguide
Gap array design, micro-strip array antenna has conductor and dielectric loss, easy drive surface ripple, leads to radiation efficiency low, antenna spoke
Penetrate distance near, compared with low-frequency range, the size of microstrip antenna is big, and this is contradicted with airborne antenna small size design principle；For ripple
Lead lap gating system, between array element, coupling influence is it is necessary to consider inside and outside coupling effect than larger, in actual applications, lead to
The coupling error crossed between experiment measurement array element is larger, and experimental work amount is very big, and Waveguide slot array antenna is difficult in fact
Existing wide-band and broad beam scanning.
Plane inverse-F array antenna advantage compared with other array antennas is：Without additional matches circuit, structure is tight
Gather, small volume, lightweight, low cost, individual antenna directional diagram has omni-directional in the horizontal direction, easily real after composition array
Existing broad beam communication.But traditional planar inverted-F antenna narrower bandwidth, due to antenna after composition array in limited spatial dimension
Strong coupling between unit causes the dissipation of antenna energy, and antenna radiation efficiency is low, and directional diagram tends not to meet in fact
Border is applied.How to solve the deficiencies in the prior art has become field of array antennas a great problem urgently to be resolved hurrily.
Content of the invention
The technical problem to be solved is to overcome the deficiencies in the prior art to provide small-sized plane inverted f and add
Carry array antenna.Inventive antenna can realize the switching of two kinds of radiation modes in wider frequency range：90 ° of wave beams of orientation are swept
Retouch and 360 ° of beam scannings of omnidirectional, this antenna efficiency is high, structure is simple, stable and small volume.
The present invention is to solve above-mentioned technical problem to employ the following technical solutions：
According to small-sized plane inverted f array of loading antenna proposed by the present invention, including antenna house, metallic plate and pedestal, metal
Plate is close to pedestal upper surface, and antenna house is fixed on pedestal, also includes four planar inverted-F antennas, center loaded body and four
Passive metal decouples module；
Wherein, four planar inverted-F antennas are evenly spaced in metallic plate upper surface composition square planar inverted F antenna array, in
Heart adding carrier is located at square planar inverted F antenna array center and is connected with metallic plate upper surface, and four passive metals decouple module
It is evenly spaced between four planar inverted-F antennas and be connected with metallic plate upper surface.
As the further prioritization scheme of small-sized plane inverted f array of loading antenna of the present invention, described center loaded body is
Passive metal body.
As the further prioritization scheme of small-sized plane inverted f array of loading antenna of the present invention, described passive metal body bag
Include circular metal plate and metal column, circular metal plate is arranged on metal column, metal column is connected with metallic plate upper surface.
As the further prioritization scheme of small-sized plane inverted f array of loading antenna of the present invention, described center loaded body is
Center loaded planar inverted-F antenna.
As the further prioritization scheme of small-sized plane inverted f array of loading antenna of the present invention, described passive metal decoupling
Module is copper post.
As the further prioritization scheme of small-sized plane inverted f array of loading antenna of the present invention, described metallic plate is copper coin,
Pedestal is aluminium base.
As the further prioritization scheme of small-sized plane inverted f array of loading antenna of the present invention, described antenna house adopts ring
Oxygen fiberglass radome.
As the further prioritization scheme of small-sized plane inverted f array of loading antenna of the present invention, described planar inverted-F antenna
Metal radiation plane is ellipse or circular or rectangle or rectangle is combined with trapezoidal.
As the further prioritization scheme of small-sized plane inverted f array of loading antenna of the present invention, described center loaded plane
The tetragon that the metal radiation plane of inverse-F antenna is constituted for curve.
The present invention adopts above technical scheme compared with prior art, has following technique effect：The present invention adopts four
Planar inverted-F antenna constitutes square planar inverted F antenna array, in square planar inverted F antenna array centrally disposed center loaded body：No
Source metallic object or center loaded planar inverted-F antenna, with the broadening beamwidth of antenna；Uniformly add between square planar inverted F antenna array
Plus passive metal decouples module and is close to dielectric radome to weaken coupling, planar inverted-F antenna radiator plane, not only make antenna structure
Stable, and reduce the size of antenna；The switching of two kinds of radiation modes realized in wider frequency range by the antenna of the present invention：
90 ° of beam scannings of orientation and 360 ° of beam scannings of omnidirectional；This antenna efficiency is high, structure is simple, stable and small volume.
Brief description
Fig. 1 is the array antenna structure schematic diagram that center loaded body of the present invention is passive metal body.
Fig. 2 is the array antenna structure schematic diagram of loaded planar inverse-F antenna centered on center loaded body of the present invention.
Fig. 3 is the metal radiation plane of planar inverted-F antenna is oval floor map.
Fig. 4 is the metal radiation plane of planar inverted-F antenna is circular floor map.
Fig. 5 is the floor map for rectangle for the metal radiation plane of planar inverted-F antenna.
Fig. 6 is the floor map for rectangle and trapezoidal composition for the metal radiation plane of planar inverted-F antenna.
Fig. 7 be planar inverted-F antenna metal radiation plane be oblique pull top board mode floor map.
Fig. 8 is center loaded body is passive metal body floor map.
Fig. 9 is loaded planar inverse-F antenna floor map centered on center loaded body.
For one of four TNC joints as feed port, remaining 3 TNC joint connects staying of 50 Ω loads to Figure 10
Bob curve chart.
Figure 11 is simultaneously equal to four TNC joint feed-in amplitudes, standing-wave ratio curve chart during 90 ° of signals of phase.
Figure 12 is one of four TNC joints as feed port, the side of remaining 3 TNC joints connections 50 Ω load
Xiang Tu：A () is to the TNC joint feed in 0 ° of direction, remaining 3 TNC joint connects the directional diagram of 50 Ω loads, and (b) is to 90 °
The TNC joint feed in direction, remaining 3 TNC joint connects the directional diagram of 50 Ω loads, and (c) is to the TNC joint in 180 ° of directions
Feed, remaining 3 TNC joint connects the directional diagram of 50 Ω loads, and (d) is that the TNC joint to 270 ° of directions feeds, remaining 3
TNC joint connects the directional diagram of 50 Ω loads.
Figure 13 is simultaneously equal to four TNC joint feed-in amplitudes, directional diagram during 90 ° of signals of phase.
Reference：1- antenna house, 2- metallic plate, 3- pedestal, 4- planar inverted-F antenna, 5- passive metal body, 6- center adds
Carry planar inverted-F antenna, 7- passive metal decouples module, 8- circular metal plate, 9- metal column, the metal spoke of 10- planar inverted-F antenna
Penetrate plane, the metal radiation plane of 11- center loaded planar inverted-F antenna, 12- coaxial TNC joint.
Specific embodiment
Below in conjunction with the accompanying drawings technical scheme is described in further detail：
It is the array antenna structure schematic diagram that center loaded body of the present invention is passive metal body as shown in Figure 1, small-sized plane
Inverted f array of loading antenna, including antenna house 1, metallic plate 2 and pedestal 3, metallic plate 2 is close to pedestal 3 upper surface, and antenna house 1 is solid
It is scheduled on pedestal 3, also include four planar inverted-F antennas 4, center loaded body and four passive metals and decouple module 7；Wherein, four
Individual planar inverted-F antenna 4 is evenly spaced in metallic plate 2 upper surface and constitutes square planar inverted F antenna array, and center loaded body is located at side
Shape plane inverted F antenna array center and being connected with metallic plate 3 upper surface, four passive metals decoupling modules 7 are fixed on metallic plate 2
Go up and be evenly spaced between four planar inverted-F antennas 4.Center loaded body is passive metal body 5, and passive metal decouples module 7
For copper post, the coupling between antenna can be weakened.
As shown in figure 1, metallic plate 2 can be square metal plate, size is 120mm*120mm, and planar inverted-F antenna 4 includes gold
Belong to radiator plane, short-circuit post and feeder pillar, metal radiation plane is oval structure, and radiator plane center is to metallic plate central horizontal
Distance is 47.5mm, and the major axis of elliptic radiation plane and short axle are each perpendicular to metal edges of boards, and four planar inverted-F antennas 4 close
All symmetrical in the center line on each side of square metal plate, constitute square planar inverted F antenna array, center loaded body falls positioned at square planar
F antenna array center and being connected with metallic plate 3 upper surface, four passive metals decoupling modules 7 are evenly spaced in four plane inverse-Fs
It is connected between antenna 4 and with metallic plate 2 upper surface, passive metal decouples the horizontal range of module centers and square metal plate center
For 67.88mm, and always there are a straight line passing through passive metal to decouple module 7 surface circular diameter and square metal plate upper surface
Diagonal is parallel, symmetrical with regard to square metal plate upper table face diagonal between four passive metal decoupling modules 7.Center loaded body
For passive metal body 5.Passive metal decoupling module 7 is copper post, can weaken the coupling between antenna.
Fig. 2 is the array antenna structure schematic diagram of loaded planar inverse-F antenna centered on center loaded body of the present invention, and center adds
Loaded planar inverse-F antenna 6 centered on carrier.
Fig. 3 is the metal radiation plane of planar inverted-F antenna is oval floor map, and Fig. 4 is planar inverted-F antenna
Metal radiation plane is circular floor map, and Fig. 5 is the plane signal for rectangle for the metal radiation plane of planar inverted-F antenna
Figure, Fig. 6 is the floor map for rectangle and trapezoidal composition for the metal radiation plane of planar inverted-F antenna, and Fig. 7 is plane inverse-F sky
The metal radiation plane of line be oblique pull top board mode floor map.Planar inverted-F antenna includes metal radiation plane, short circuit
Post and feeder pillar, the metal radiation plane 10 that this five width figure is planar inverted-F antenna is oval or circular or rectangle or rectangle
Combine with trapezoidal.
Fig. 8 is center loaded body is passive metal body floor map, and passive metal body 5 includes circular metal plate 8 and gold
Belong to post 9, circular metal plate 8 is arranged on metal column 9, and metal column 9 is connected with metallic plate 2 upper surface.Fig. 9 is that center loaded body is
Center loaded planar inverted-F antenna floor map, center loaded planar inverted-F antenna 6 includes metal radiation plane, short-circuit post, feedback
Electric post, the tetragon that the metal radiation plane 11 of center loaded planar inverted-F antenna is constituted for curve.
Metallic plate 2 is copper coin；Pedestal 3 is aluminium base, can mitigate antenna weights.Antenna house 1 adopts fiber glass epoxy antenna
Cover, the antenna house of fiber glass epoxy is close to square planar inverted F antenna array and is effectively reduced planar inverted-F antenna metal radiation plane 10
Size and reduce the whole height of antenna.
For one of four TNC joints as feed port, remaining 3 TNC joint connects staying of 50 Ω loads to Figure 10
Bob curve chart.Figure 11 is simultaneously equal to four TNC joint feed-in amplitudes, standing-wave ratio curve during 90 ° of signals of phase
Figure.Figure 12 is one of four TNC joints as feed port, the directional diagram of remaining 3 TNC joints connections 50 Ω load：
A () is to the TNC joint feed in 0 ° of direction, remaining 3 TNC joint connects the directional diagram of 50 Ω loads, and (b) is to 90 ° of directions
TNC joint feed, remaining 3 TNC joint connects the directional diagram of 50 Ω loads, and (c) is to the TNC joint feedback in 180 ° of directions
Electricity, remaining 3 TNC joint connects the directional diagram of 50 Ω loads, and (d) is to the TNC joint feed in 270 ° of directions, remaining 3 TNC
Joint connects the directional diagram of 50 Ω loads.Figure 13 is simultaneously equal to four TNC joint feed-in amplitudes, 90 ° of signals of phase
When directional diagram.The present invention all can realize the switching of the orientation/omnidirectional of antenna in wider frequency band range.
The present invention adopts four coaxial TNC joints 12 through pedestal 3 and the feed with four planar inverted-F antennas 4 respectively
Post connects, and when feeding to planar inverted-F antenna 4 feeder pillar by any one TNC joint 12, other ports connect 50 Ω loads
When, it is possible to achieve the scanning of 90 ° of beam-formings of antenna, when give four planar inverted-F antenna 4 feed-in amplitudes equal simultaneously but phase
During 90 ° of signal, antenna can realize 360 ° of omni-beam scannings；Inventive antenna is added using use center as shown in Figure 2
Carry planar inverted-F antenna 6 mode also to enable to orient the switching with omnidirectional, this center loaded planar inverted-F antenna 6 includes four sides and is
The metal radiation plane of curve, short-circuit post, feeder pillar, can realize sky when feeding to any one planar inverted-F antenna 4 of surrounding
90 ° of beam scannings of line, now center loaded body be equivalent to the function that passive metal body 5 is risen, the beamwidth of antenna can be increased, when independent
360 ° of beam scannings of omnidirectional can be realized to center loaded planar inverted-F antenna 10 when feeding.The present invention all can be in wider bandwidth
In the range of realize antenna orientation/omnidirectional switching.
Specific implementation can be divided into the following steps：The first step, by the short-circuit column bottom of four planar inverted-F antennas 4, center
Adding carrier, screwed hole is stamped in four passive metal decoupling module 7 bottoms, is then screwed on metallic plate 2；Second step,
Metallic plate 2 is positioned on pedestal 3, pedestal 3 punching facilitates the screw in the first step to sink in hole it is ensured that pedestal 3 and metallic plate 2
Between leave no gaps, in metallic plate 2 and the punching of pedestal 3 surrounding, and be screwed；3rd step, four coaxial TNC joints 12 are worn
Cross the pedestal 3 of bear, be connected with the feeder pillar of planar inverted-F antenna 4, and it is solid that coaxial TNC joint 12 surrounding is added screw
It is scheduled on metallic plate 2；4th step, antenna house 1 is screwed on pedestal 3.
Above example technological thought only to illustrate the invention is it is impossible to limit protection scope of the present invention for this, every
According to technological thought proposed by the present invention, any change done on the basis of technical scheme, each fall within the scope of the present invention
Within.
Claims (8)
1. small-sized plane inverted f array of loading antenna, including antenna house, metallic plate and pedestal, metallic plate is close to pedestal upper surface,
Antenna house is fixed on pedestal it is characterised in that also including four planar inverted-F antennas, center loaded body and four passive metals
Decoupling module；
Wherein, four planar inverted-F antennas are evenly spaced in metallic plate upper surface composition square planar inverted F antenna array, and center adds
Carrier is located at square planar inverted F antenna array center and is connected with metallic plate upper surface, and four passive metal decoupling modules are uniform
It is arranged between four planar inverted-F antennas and be connected with metallic plate upper surface；
Described center loaded body is passive metal body, with the broadening beamwidth of antenna.
2. small-sized plane inverted f array of loading antenna according to claim 1 is it is characterised in that described passive metal body bag
Include circular metal plate and metal column, circular metal plate is arranged on metal column, metal column is connected with metallic plate upper surface.
3. small-sized plane inverted f array of loading antenna according to claim 1 is it is characterised in that described center loaded body is
Center loaded planar inverted-F antenna.
4. small-sized plane inverted f array of loading antenna according to claim 1 is it is characterised in that described passive metal decouples
Module is copper post.
5. small-sized plane inverted f array of loading antenna according to claim 1 it is characterised in that described metallic plate be copper coin,
Pedestal is aluminium base.
6. small-sized plane inverted f array of loading antenna according to claim 1 is it is characterised in that described antenna house adopts ring
Oxygen fiberglass radome.
7. small-sized plane inverted f array of loading antenna according to claim 1 is it is characterised in that described planar inverted-F antenna
Metal radiation plane is ellipse or circular or rectangle or rectangle is combined with trapezoidal.
8. small-sized plane inverted f array of loading antenna according to claim 3 is it is characterised in that described center loaded plane
The tetragon that the metal radiation plane of inverse-F antenna is constituted for curve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410274578.6A CN104103913B (en) | 2014-06-18 | 2014-06-18 | Small-sized plane reversed F loading array antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410274578.6A CN104103913B (en) | 2014-06-18 | 2014-06-18 | Small-sized plane reversed F loading array antenna |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104103913A CN104103913A (en) | 2014-10-15 |
| CN104103913B true CN104103913B (en) | 2017-02-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410274578.6A Active CN104103913B (en) | 2014-06-18 | 2014-06-18 | Small-sized plane reversed F loading array antenna |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105428814A (en) * | 2015-12-31 | 2016-03-23 | 徐兆东 | Microstrip antenna array for detecting low-altitude, slow-speed and small-target radar |
| US10522915B2 (en) | 2017-02-01 | 2019-12-31 | Shure Acquisition Holdings, Inc. | Multi-band slotted planar antenna |
| CN107895849A (en) * | 2017-11-16 | 2018-04-10 | 上海守远通讯科技有限公司 | The Internet of Things antenna of intelligent charging spot |
| CN109533392A (en) * | 2018-12-07 | 2019-03-29 | 西安飞机工业（集团）有限责任公司 | A kind of antenna cover inner surface foil gauge patch location determines method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101159352A (en) * | 2006-09-11 | 2008-04-09 | 蒂科电子公司 | Multiple antenna array with high isolation |
| EP1291973B1 (en) * | 2000-03-27 | 2008-07-30 | China Academy of Telecommunications Technology | A method for improving intelligent antenna array coverage |
| CN203423258U (en) * | 2013-08-29 | 2014-02-05 | 成都九洲电子信息系统股份有限公司 | RFID antenna |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204011741U (en) * | 2014-06-18 | 2014-12-10 | 南京信息工程大学 | The small-sized plane array of loading of falling F antenna |
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2014
- 2014-06-18 CN CN201410274578.6A patent/CN104103913B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1291973B1 (en) * | 2000-03-27 | 2008-07-30 | China Academy of Telecommunications Technology | A method for improving intelligent antenna array coverage |
| CN101159352A (en) * | 2006-09-11 | 2008-04-09 | 蒂科电子公司 | Multiple antenna array with high isolation |
| CN203423258U (en) * | 2013-08-29 | 2014-02-05 | 成都九洲电子信息系统股份有限公司 | RFID antenna |
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Application publication date: 20141015 Assignee: Nanjing Qiyun Zhongtian Technology Co.,Ltd. Assignor: Nanjing University of Information Science and Technology Contract record no.: X2023320000238 Denomination of invention: Small planar inverted F-loaded array antenna Granted publication date: 20170215 License type: Common License Record date: 20231121 |
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Application publication date: 20141015 Assignee: Fujian hefuyun Information Technology Co.,Ltd. Assignor: Nanjing University of Information Science and Technology Contract record no.: X2023980051730 Denomination of invention: Small planar inverted F-loaded array antenna Granted publication date: 20170215 License type: Common License Record date: 20231212 |
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Assignee: Fujian hefuyun Information Technology Co.,Ltd. Assignor: Nanjing University of Information Science and Technology Contract record no.: X2023980051730 Date of cancellation: 20240507 |