CN112909538A - High-frequency RFID reader-writer antenna - Google Patents
High-frequency RFID reader-writer antenna Download PDFInfo
- Publication number
- CN112909538A CN112909538A CN202110043996.4A CN202110043996A CN112909538A CN 112909538 A CN112909538 A CN 112909538A CN 202110043996 A CN202110043996 A CN 202110043996A CN 112909538 A CN112909538 A CN 112909538A
- Authority
- CN
- China
- Prior art keywords
- turn
- radiation coil
- radiation
- antenna
- feeder
- 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.)
- Pending
Links
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/002—Protection against seismic waves, thermal radiation or other disturbances, e.g. nuclear explosion; Arrangements for improving the power handling capability of an antenna
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/2208—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems
- H01Q1/2216—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems used in interrogator/reader equipment
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
Landscapes
- Details Of Aerials (AREA)
Abstract
The invention discloses a high-frequency RFID reader-writer antenna, which comprises a dielectric substrate, an antenna radiator and an antenna feeder, wherein the antenna radiator is attached to the upper surface of the dielectric substrate and comprises a plurality of turns of radiation coils, each turn of radiation coil is respectively in a rectangular ring shape or a circular ring shape with an opening, the plurality of turns of radiation coils are concentrically distributed from inside to outside, the center of each turn of radiation coil is perpendicular to the dielectric substrate with the center connecting line of the dielectric substrate, the openings of the radiation coils of each turn are parallel, the distance between two adjacent turns of radiation coils is reduced from outside to inside, the two adjacent turns of radiation coils are connected through a microstrip connecting line, and the antenna feeder comprises a first feeder, a second feeder, a third feeder and a fourth feeder; the advantages are low cost, easy processing, small whole size, easy integration, high efficiency and large reading and writing range.
Description
Technical Field
The invention relates to an RFID reader-writer antenna, in particular to a high-frequency RFID reader-writer antenna.
Background
With the wide application of high frequency RFID technology in retail, location, packaging, logistics transportation, wireless sensing, security access control and other scenes, people have an increasing interest in using emerging Radio Frequency Identification (RFID) technology. In a high-Frequency RFID (radio Frequency identification) system, bidirectional communication is established between a reader-writer (PCD) and a tag (PICC) in a magnetic coupling induction mode, and when a reader-writer antenna and a tag antenna are adjusted to a common operating Frequency of 13.56MHz, the bidirectional communication and information transmission of the reader-writer and the tag can be carried out. In general, the read-write range of HF RFID systems is limited by output power and antenna size, with read-write distances in the range of 0-10 cm. The performance of a reader antenna, which is one of the core components in an HF RFID system, has a significant influence on the read-write distance and the read-write quality of the reader. In various application scenarios of a reader-writer, a longer identification distance and a better identification rate are often desired, which requires that an antenna has higher gain in a near field region; the reader-writer is used as a handheld device, and the volume of the antenna is often desired to be as small as possible. According to the theory of antennas, there is a certain contradiction between the gain and bandwidth of antennas and the size reduction of antennas, so it is necessary to develop a high magnetic field strength reader-writer antenna technology with miniaturization feature.
At present, the high-frequency RFID reader antenna adopted in the industry mainly has two types: the first is a classic coil antenna scheme, which forms an antenna by winding a copper tube or an enameled wire, and has the advantages of simple structure, low cost, and suitability for a read-write system with a longer read-write distance or a low requirement on size, and the disadvantage of low efficiency, a recognition blind area in a near field area, and large overall size, so that the integration with a reader-writer is difficult; the second microstrip coil antenna scheme, which forms an antenna pattern by coating copper on a dielectric substrate and performing metal etching, has the advantages of easy processing, mass production and low profile, but the radiated magnetic field is usually small, the bandwidth is narrow, and the identification distance is short. The application scene of the high-frequency RFID system is restricted by the problems of the antenna implementation schemes.
Therefore, the efficiency of the antenna of the existing reader-writer is poor, which causes the efficiency reduction of the high-frequency RFID system and the reduction of the reading-writing range, and brings inconvenience in the actual application scene.
Disclosure of Invention
The invention aims to solve the technical problem of providing a high-frequency RFID reader-writer antenna which is low in cost, easy to process, small in integral size, easy to integrate, high in efficiency and large in reading and writing range.
The technical scheme adopted by the invention for solving the technical problems is as follows: a high-frequency RFID reader-writer antenna comprises a medium substrate, an antenna radiator and an antenna feed body, wherein the antenna radiator is attached to the upper surface of the medium substrate and comprises N turns of radiation coils, N is an integer larger than 2, each turn of radiation coil is a rectangular ring or a circular ring with an opening, the N turns of radiation coils are concentrically distributed from inside to outside, the center of each turn of radiation coil is perpendicular to the medium substrate with the center connecting line of the medium substrate, the openings of the radiation coils are parallel to each other, the radiation coil positioned on the outermost circle is used as a 1 st turn of radiation coil, and in the same way, the radiation coil positioned on the innermost circle is used as an N th turn of radiation coil, the distance between the kth turn of radiation coil and the kth +1 th turn of radiation coil is larger than the distance between the kth +1 th turn of radiation coil and the kth +2 th turn of radiation coil, k is 1,2, …, N-2, one end of the opening of each turn of radiation coil is used as the starting end of the turn of radiation coil, the other end of the opening is used as the tail end of the turn of radiation coil, the starting end of the nth turn of radiation coil and the tail end of the N +1 th turn of radiation coil are connected through the nth microstrip connecting line, and the starting end of the nth turn of radiation coil and the tail end of the N +1 th turn of radiation coil are located on the same plane, N is 1,2, …, N-1, the antenna feed body comprises a first feed line, a second feed line, a third feed line and a fourth feed line, the first feed line, the second feed line and the third feed line are attached to the upper surface of the dielectric substrate and located inside the nth turn of radiation coil, the right end of the first feed line is connected with the starting end of the nth radiation coil, the left end of the first feed line is connected with the front end of the second feed line, an included angle between the second feeder line and the first feeder line is 90 degrees, the third feeder line is positioned at the rear side of the second feeder line and on the same straight line, a distance is reserved between the front end of the third feeder line and the rear end of the second feeder line, and a distance is reserved between the rear end of the third feeder line and the Nth turn of radiation coil; the fourth feeder line is attached to the lower surface of the dielectric substrate, and the fourth feeder line and the third feeder line are crossed when the fourth feeder line is mapped to the upper surface of the dielectric substrate. The fourth feeder line is connected with the third feeder line through a first metal cylinder, the fourth feeder line is connected with the tail part of the 1 st turn of radiation coil through a second metal column, the dielectric substrate is provided with a first metalized through hole and a second metalized through hole which vertically penetrate through the dielectric substrate, the first metal column is positioned in the first metalized through hole, the second metal column is positioned in the second metalized through hole, the number of turns of the radiation coil in the antenna radiator and the distance between the turns of the radiation coil are determined according to required performance indexes, and the sizes of the antenna radiator and the antenna feeder body can be adjusted according to the size of the antenna and the processing technology.
Compared with the prior art, the high-frequency reader-writer antenna has the advantages that the high-frequency reader-writer antenna is realized by combining the feed bodies distributed on the surface of the dielectric substrate with N turns of radiation coils which are connected end to end and have different lengths, the structure is simple, the section is lower, and the feed bodies are composed of four parts, namely a first feed line, a second feed line, a third feed line and a fourth feed line; the N turns of the radiation coils are distributed in a non-equidistant distribution mode to avoid the problem of overlarge coupling capacitance between the radiation coils caused by the close winding of the radiation coils, thereby improving the radiation efficiency of the antenna, realizing the provision of stronger magnetic field intensity in the Z-axis direction on the basis of providing the original identification range, simultaneously, the non-uniform distribution of the radiation coils optimizes the distribution of the magnetic field in the horizontal plane, avoids the problem of reading and writing blind areas when the antenna is larger in size, simultaneously does not cause the rise of the quality factor of the reader-writer antenna on the basis of improving the radiation capability of the reader-writer antenna, can ensure enough antenna bandwidth to meet the communication requirement of a system, in addition, the whole antenna can be realized by a conventional circuit etching process, the processing is simple, and the mass production is easy, in addition, the antenna has a lower section and is easy to integrate with small equipment, so that the antenna is low in cost, easy to process, small in overall size, easy to integrate, high in efficiency and large in reading and writing range.
Drawings
FIG. 1 is a block diagram of a high frequency RFID reader antenna of the present invention;
fig. 2 is an exploded view of the high frequency RFID reader antenna of the present invention;
fig. 3 is a structural diagram of the antenna radiator of the high frequency RFID reader antenna of the present invention including a radiation coil of 3 turns;
fig. 4 is an H-field curve diagram of the high frequency RFID reader antenna of the present invention.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
Example (b): as shown in fig. 1 and 2, a high frequency RFID reader/writer antenna includes a dielectric substrate 1, an antenna radiator, and an antenna feeder, the antenna radiator is attached to the upper surface of the dielectric substrate 1, the antenna radiator includes N turns of radiation coils, N is an integer greater than 2, each turn of radiation coil is a rectangular ring or a circular ring with an opening, the N turns of radiation coils are concentrically distributed from inside to outside, and the center of the N turns of radiation coils is perpendicular to the dielectric substrate 1 with the center connecting line of the center of the dielectric substrate 1, the openings of each turn of radiation coils are parallel to each other, the radiation coil located at the outermost circle is used as a 1 st turn of radiation coil T1, and so on, the radiation coil located at the innermost circle is used as an N-th turn of radiation coil TN, the distance between the k-th turn of radiation coil Tk and the k + 1-th turn of radiation coil T (k +1) is greater than the distance between the k + 1-th turn of radiation coil T (k + 2-th turn of radiation coil T (k, k is 1,2, …, N-2, one end of the opening of each turn of radiation coil is used as the starting end of the turn of radiation coil, the other end of the opening is used as the tail end of the turn of radiation coil, the starting end of the nth turn of radiation coil Tn and the tail end of the (N +1) th turn of radiation coil T (N +1) are connected through the nth microstrip connecting line Ln, and the starting end of the nth turn of radiation coil Tn and the tail end of the (N +1) th turn of radiation coil T (N +1) are located on the same plane, N is 1,2, …, N-1, the antenna feeder comprises a first feeder 2, a second feeder 3, a third feeder 4, and a fourth feeder 5, the first feeder 2, the second feeder 3, and the third feeder 4 are attached to the upper surface of the dielectric substrate 1 and located inside the nth turn of radiation coil, the right end of the first feeder 2 is connected with the starting end of the nth turn of radiation coil, the left end of the first feeder 2 is connected with the front end of the second feeder 3, an included angle between the second feeder line 3 and the first feeder line 2 is 90 degrees, the third feeder line 4 is positioned on the same straight line with the rear side of the second feeder line 3, a distance is reserved between the front end of the third feeder line 4 and the rear end of the second feeder line 3, and a distance is also reserved between the rear end of the third feeder line 4 and the Nth turn of radiation coil TN; the fourth feed line 5 is attached to the lower surface of the dielectric substrate 1, and crosses the third feed line 4 when the fourth feed line 5 is mapped to the upper surface of the dielectric substrate 1. The fourth feeder line 5 is connected with the third feeder line 4 through a first metal cylinder, the fourth feeder line 5 is connected with the tail part of the 1 st turn of radiation coil through a second metal column, a first metalized through hole and a second metalized through hole vertically penetrate through the dielectric substrate 1, the first metal column is positioned in the first metalized through hole, the second metal column is positioned in the second metalized through hole, the number of turns of the radiation coil in the antenna radiator and the distance between the turns of the radiation coil are determined according to required performance indexes, and the sizes of the antenna radiator and the antenna feeder can be adjusted according to the size of the antenna and the processing technology.
As shown in fig. 3, in this embodiment, an antenna radiator in the high-frequency RFID reader antenna of the present invention includes 3 turns of radiation coils, the high-frequency RFID reader antenna of the present invention is formed by etching through a PCB process, and a cross-sectional area of the radiation coils is 35umx300 um; the medium substrate 1 is an FR4 medium plate, the dielectric constant is 4.4, the size of the medium substrate is 90mmx90mmx0.5mm, and the radiation coils of the antenna radiator are distributed along the central diameter in a non-equidistant mode; the length of the 1 st microstrip connecting line L1 is 19.3mm, the length of the 2 nd microstrip connecting line L2 is 11.8mm, the head-to-tail horizontal spacing of the 1 st turn radiation coil and the 2 nd turn radiation coil is 2.4mm, the head-to-tail spacing of the 3 rd turn radiation coil is 8mm, the length of the first feeder line 2 and the length of the second feeder line 3 are 4.8mm, the diameter of the first metal column and the diameter of the second metal column are 0.3mm, and the diameter of the first metalized through hole and the diameter of the second metalized through hole are 0.3 mm. The specific dimensions of the 3 turn radiating coil are shown in table 1:
TABLE 1
| Number of turns | T1 | T2 | T3 |
| Length L (mm) | 84 | 44.8 | 20.4 |
| Width W (mm) | 84 | 44.8 | 20.4 |
The high-frequency RFID reader antenna of the present embodiment is modeled and simulated in the electromagnetic simulation software ANSYS HFSS, where the simulation conditions are as follows: the resonant frequency was 13.56MH, the bandwidth was 2.1MHz, and ANSYS HFSS set the input power at the input port to 1W. The simulation result of the H field of the high-frequency RFID reader antenna of the present embodiment, which is obtained through modeling simulation, along with the change in the vertical distance is shown in fig. 4. Analysis of FIG. 4 reveals that: in the result of ANSYS HFSS simulation, at 55mm vertical direction, the H field strength is greater than 1.5A/m, which meets the requirement of working magnetic field strength of real ISO14443B protocol, and at 90mm vertical direction, the H field strength is greater than 0.25A/m, which meets the requirement of working magnetic field strength of ISO15693 protocol. Therefore, the high-frequency RFID reader-writer antenna provided by the invention provides stronger H field and higher radiation efficiency under the conditions of the same size, the same input power and the like.
Claims (1)
1. A high-frequency RFID reader-writer antenna is characterized by comprising a dielectric substrate, an antenna radiator and an antenna feed body, wherein the antenna radiator is attached to the upper surface of the dielectric substrate and comprises N turns of radiation coils, N is an integer larger than 2, each turn of radiation coil is a rectangular ring or a circular ring with an opening, the N turns of radiation coils are concentrically distributed from inside to outside, the center of each turn of radiation coil is perpendicular to the dielectric substrate with the central connecting line of the dielectric substrate and the center of each turn of radiation coil, the openings of the turn of radiation coils are parallel to each other, the radiation coil positioned on the outermost circle is used as a 1 st turn of radiation coil, and in the same way, the radiation coil positioned on the innermost circle is used as an N th turn of radiation coil, the distance between the kth turn of radiation coil and the kth +1 th turn of radiation coil is larger than the distance between the kth +1 th turn of radiation coil and the kth +2 th turn of radiation coil, k is 1,2, …, N-2, one end of the opening of each turn of radiation coil is used as the starting end of the turn of radiation coil, the other end of the opening is used as the tail end of the turn of radiation coil, the starting end of the nth turn of radiation coil and the tail end of the N +1 th turn of radiation coil are connected through the nth microstrip connecting line, and the starting end of the nth turn of radiation coil and the tail end of the N +1 th turn of radiation coil are located on the same plane, N is 1,2, …, N-1, the antenna feed body comprises a first feed line, a second feed line, a third feed line and a fourth feed line, the first feed line, the second feed line and the third feed line are attached to the upper surface of the dielectric substrate and located inside the nth turn of radiation coil, the right end of the first feed line is connected with the starting end of the nth radiation coil, the left end of the first feed line is connected with the front end of the second feed line, an included angle between the second feeder line and the first feeder line is 90 degrees, the third feeder line is positioned at the rear side of the second feeder line and on the same straight line, a distance is reserved between the front end of the third feeder line and the rear end of the second feeder line, and a distance is reserved between the rear end of the third feeder line and the Nth turn of radiation coil; the fourth feeder line is attached to the lower surface of the dielectric substrate, and the fourth feeder line and the third feeder line are crossed when the fourth feeder line is mapped to the upper surface of the dielectric substrate. The fourth feeder line is connected with the third feeder line through a first metal cylinder, the fourth feeder line is connected with the tail part of the 1 st turn of radiation coil through a second metal column, the dielectric substrate is provided with a first metalized through hole and a second metalized through hole which vertically penetrate through the dielectric substrate, the first metal column is positioned in the first metalized through hole, the second metal column is positioned in the second metalized through hole, the number of turns of the radiation coil in the antenna radiator and the distance between the turns of the radiation coil are determined according to required performance indexes, and the sizes of the antenna radiator and the antenna feeder body can be adjusted according to the size of the antenna and the processing technology.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110043996.4A CN112909538A (en) | 2021-01-13 | 2021-01-13 | High-frequency RFID reader-writer antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110043996.4A CN112909538A (en) | 2021-01-13 | 2021-01-13 | High-frequency RFID reader-writer antenna |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112909538A true CN112909538A (en) | 2021-06-04 |
Family
ID=76112905
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110043996.4A Pending CN112909538A (en) | 2021-01-13 | 2021-01-13 | High-frequency RFID reader-writer antenna |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112909538A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101335374A (en) * | 2008-08-06 | 2008-12-31 | 厦门大学 | Connection method for bridge of electronic label antenna |
| KR20090032509A (en) * | 2007-09-28 | 2009-04-01 | 한국전자통신연구원 | Radio frequency identification tag antenna for attaching to metal |
| CN103530680A (en) * | 2013-09-16 | 2014-01-22 | 杭州电子科技大学 | Dual-frequency radio frequency identification tag and radio frequency identification system with same |
| US20140117095A1 (en) * | 2012-11-01 | 2014-05-01 | NETHOM, Co., Ltd | Tag integrated circuit module apparatus and method of fabricating tag integrated circuit module apparatus |
| CN104078745A (en) * | 2013-03-29 | 2014-10-01 | 株式会社村田制作所 | Antenna assembly |
| CN106374214A (en) * | 2016-11-28 | 2017-02-01 | 重庆智能水表集团有限公司 | Mini spiral microstrip antenna |
| CN206490172U (en) * | 2017-02-09 | 2017-09-12 | 淮北师范大学 | Super high frequency radio frequency recognizes antenna |
| CN207852909U (en) * | 2017-08-30 | 2018-09-11 | 江苏稻源微电子有限公司 | A kind of RFID tag and radio-frequency recognition system |
-
2021
- 2021-01-13 CN CN202110043996.4A patent/CN112909538A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20090032509A (en) * | 2007-09-28 | 2009-04-01 | 한국전자통신연구원 | Radio frequency identification tag antenna for attaching to metal |
| CN101335374A (en) * | 2008-08-06 | 2008-12-31 | 厦门大学 | Connection method for bridge of electronic label antenna |
| US20140117095A1 (en) * | 2012-11-01 | 2014-05-01 | NETHOM, Co., Ltd | Tag integrated circuit module apparatus and method of fabricating tag integrated circuit module apparatus |
| CN104078745A (en) * | 2013-03-29 | 2014-10-01 | 株式会社村田制作所 | Antenna assembly |
| CN103530680A (en) * | 2013-09-16 | 2014-01-22 | 杭州电子科技大学 | Dual-frequency radio frequency identification tag and radio frequency identification system with same |
| CN106374214A (en) * | 2016-11-28 | 2017-02-01 | 重庆智能水表集团有限公司 | Mini spiral microstrip antenna |
| CN206490172U (en) * | 2017-02-09 | 2017-09-12 | 淮北师范大学 | Super high frequency radio frequency recognizes antenna |
| CN207852909U (en) * | 2017-08-30 | 2018-09-11 | 江苏稻源微电子有限公司 | A kind of RFID tag and radio-frequency recognition system |
Non-Patent Citations (1)
| Title |
|---|
| 俞凯航等: "一种分布式HF RFID读写器天线设计", 《无线通信技术》 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7183994B2 (en) | Compact antenna with directed radiation pattern | |
| CN201966324U (en) | Radio frequency identification double-frequency tag antenna | |
| CN101536344A (en) | Antenna for near field and far field radio frequency identification | |
| CN202395152U (en) | Antenna, electronic tag and electronic tag reader | |
| CN103401074A (en) | Broadband circularly-polarized slot antenna applied to radio frequency identification system | |
| CN202134026U (en) | Reader-writer, electronic tag and radio frequency identification system | |
| CN112909538A (en) | High-frequency RFID reader-writer antenna | |
| CN110247179B (en) | UHF near field RFID reader antenna capable of identifying randomly placed tags | |
| CN105375099A (en) | A two-frequency band antenna and a signal transmitting and receiving method of the antenna | |
| Tan et al. | Compact dual band tag antenna design for radio frequency identification (RFID) application | |
| CN104979626A (en) | Quasi-Yagi antenna array apparatus | |
| CN112216969B (en) | Compact UHF RFID folding anti-metal tag antenna | |
| CN107394388B (en) | Resonant ring near-field antenna with group reading performance | |
| CN210639622U (en) | Industrial grade near field reader-writer | |
| CN108923111B (en) | UHF RFID near field reader antenna applied to liquid environment | |
| US10977545B2 (en) | Radio frequency screw antenna and radio frequency screw tag | |
| CN102142601B (en) | Miniature radio frequency identification reading antenna | |
| CN102810168A (en) | Reader-writer, electronic label and radio frequency identification system | |
| El Ahmar et al. | A new passive UHF RFID tag using square split ring resonator | |
| CN113285206A (en) | Miniaturized omnidirectional UHF-RFID (ultra high frequency-radio frequency identification) tag antenna and preparation method thereof | |
| CN202217292U (en) | Reader-writer, electronic tag and RFID system | |
| Liang et al. | Design of a new HF RFID Reader antenna | |
| CN109361071B (en) | Ring array antenna with expandable read-write area | |
| CN211829193U (en) | Near field communication antenna structure | |
| CN219696706U (en) | Ultrahigh frequency small-size near-field antenna |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20210604 |
|
| WD01 | Invention patent application deemed withdrawn after publication |