CN114239764A - Radio frequency tag identifier, manufacturing method, application and RFID management system - Google Patents
Radio frequency tag identifier, manufacturing method, application and RFID management system Download PDFInfo
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- CN114239764A CN114239764A CN202111248394.9A CN202111248394A CN114239764A CN 114239764 A CN114239764 A CN 114239764A CN 202111248394 A CN202111248394 A CN 202111248394A CN 114239764 A CN114239764 A CN 114239764A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K17/00—Methods or arrangements for effecting co-operative working between equipments covered by two or more of main groups G06K1/00 - G06K15/00, e.g. automatic card files incorporating conveying and reading operations
- G06K17/0022—Methods or arrangements for effecting co-operative working between equipments covered by two or more of main groups G06K1/00 - G06K15/00, e.g. automatic card files incorporating conveying and reading operations arrangements or provisious for transferring data to distant stations, e.g. from a sensing device
- G06K17/0029—Methods or arrangements for effecting co-operative working between equipments covered by two or more of main groups G06K1/00 - G06K15/00, e.g. automatic card files incorporating conveying and reading operations arrangements or provisious for transferring data to distant stations, e.g. from a sensing device the arrangement being specially adapted for wireless interrogation of grouped or bundled articles tagged with wireless record carriers
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- G—PHYSICS
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- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
- H01F27/306—Fastening or mounting coils or windings on core, casing or other support
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
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Abstract
The invention discloses a radio frequency tag identifier, a manufacturing method, application and a Radio Frequency Identification (RFID) management system, wherein the radio frequency tag identifier can comprise the following components: the RFID chip comprises a PCB, a capacitor and an RFID chip which are arranged on the PCB, and an inductance component connected with the PCB; the inductance assembly includes: the ferrite magnetic rod and an inductance coil wound outside the ferrite magnetic rod; two ends of the inductance coil are respectively welded with the PCB; the inductance value of the ferrite magnetic rod is positively correlated with the number of turns of the inductance coil, and the inductance value of the ferrite magnetic rod after winding is matched with the capacitance value of the capacitor. The ferrite magnetic bars are classified according to the inductance values, the inductance coils with corresponding turns are matched in each category, and the turns and the inductance values are in positive correlation, so that the large dispersion range of the inductance values is avoided. And then, based on the matching of the inductance value of the wound ferrite magnetic rod and the capacitance value of the capacitor, the full utilization of the stored capacitor is ensured, and the product does not need to be wound again in the manufacturing process, so that the loss of the product is saved, and the first pass rate of the product is improved.
Description
Technical Field
The invention relates to the technical field of RFID (radio frequency identification devices), in particular to a radio frequency tag identifier, a manufacturing method, an application and an RFID management system.
Background
In the prior art, when a radio frequency tag identifier based on an RFID technology is manufactured, the existing process flow is as follows: classifying by size magnetic rods → winding → tangent line ironing → high temperature adhesive tape winding → inductance value test → PCB assembly welding → performance test → encapsulation → performance test → injection molding → performance test → laser coding → packaging. In the manufacturing and processing process, the magnetic rods provided by a supplier are divided into A/B types according to the length and the size of the magnetic rods, then the classified magnetic rods are matched with the number of the fixed rings for winding, and the capacitance values of corresponding capacitors are matched according to the inductance values after the winding is finished so as to meet the performance requirements.
Disclosure of Invention
The inventor has found that, in general, the inductance value spread after winding is large, a large number of capacitors are required, and the corresponding capacitance values are selected to meet the performance requirements. This increases the capacitor inventory, which is expected to be 50% more purchased than the production volume. If the inductance value of the magnetic bar after winding does not match the capacitance, the excitation wire is scrapped and rewound, the material loss is increased, and the first pass rate of the product is low. That is, according to the existing process steps, the capacitance value of the capacitor is matched through the inductance value. If the capacitance value is not matched, the magnetic rod wound with the excitation wire needs to be wound again, and the material loss and the inductance value distribution range of the capacitor are increased.
In view of the above, the present invention has been made to provide a radio frequency tag identifier, a manufacturing method, an application and an RFID management system that overcome or at least partially solve the above problems.
In a first aspect, an embodiment of the present invention provides a radio frequency tag identifier, which may include: the RFID chip comprises a PCB, a capacitor and an RFID chip which are arranged on the PCB, and an inductance component connected with the PCB;
the inductance assembly includes: the ferrite magnetic rod and the inductance coil wound outside the ferrite magnetic rod; two ends of the inductance coil are respectively welded with the PCB;
the inductance value of the ferrite magnetic rod is positively correlated with the number of turns of the inductance coil, and the inductance value of the ferrite magnetic rod after winding is matched with the capacitance value of the capacitor.
Optionally, a matching relationship between the inductance value of the ferrite magnetic rod after winding and the capacitance value of the capacitor is as follows:
wherein f is the inductance value of the ferrite magnetic rod after winding; l is the inductance value of the inductance coil; and C is the capacitance value of the capacitor.
Optionally, the ferrite magnetic rod is provided with at least one tangent plane parallel to the central axis of the magnetic rod.
Optionally, the radio frequency tag identifier may further include:
a removable housing; the shell is integrally formed by injection molding.
Optionally, the housing is made of polypropylene and/or glass fiber.
In a second aspect, an embodiment of the present invention provides an RFID management system, which may include: a reader and at least one radio frequency tag identifier as described in the first aspect;
the radio frequency tag identifier is used for identifying managed material equipment;
the reader is used for reading and writing the RFID chip in the radio frequency tag identifier.
Optionally, the system may further include: a handheld terminal; the handheld terminal is connected with the reader through Bluetooth.
In a third aspect, an embodiment of the present invention provides a method for preparing a radio frequency tag identifier in the first aspect, where the method may include:
classifying the ferrite magnetic rod according to the inductance value of the ferrite magnetic rod;
matching the number of turns of the induction coil for the classified ferrite magnetic rods according to the inductance value interval corresponding to the class;
carrying out winding operation treatment on the ferrite magnetic rod according to the number of turns of the inductance coil;
and detecting the inductance value of the wound ferrite magnetic rod, and determining the capacitance of the capacitance value matched with the wound ferrite magnetic rod according to the inductance value of the wound ferrite magnetic rod so as to prepare the radio frequency tag identifier.
Optionally, the capacitance of the capacitance value is matched with the inductance value of the ferrite bar after winding, and the matching relationship is as follows:
wherein f is the inductance value of the ferrite magnetic rod after winding; l is the inductance value of the inductance coil; and C is the capacitance value of the capacitor.
In a fourth aspect, an embodiment of the present invention provides an application of the radio frequency tag identifier in the first aspect in an RFID management system.
The technical scheme provided by the embodiment of the invention has the beneficial effects that at least:
the embodiment of the invention provides a radio frequency tag identifier, a manufacturing method, application and a Radio Frequency Identification (RFID) management system, wherein the radio frequency tag identifier can comprise the following components: the RFID chip comprises a PCB, a capacitor and an RFID chip which are arranged on the PCB, and an inductance component connected with the PCB; the inductance assembly includes: the ferrite magnetic rod and an inductance coil wound outside the ferrite magnetic rod; two ends of the inductance coil are respectively welded with the PCB; the inductance value of the ferrite magnetic rod is positively correlated with the number of turns of the inductance coil, and the inductance value of the ferrite magnetic rod after winding is matched with the capacitance value of the capacitor. The inventor firstly uses a special inductance value testing device to detect the inductance value of the ferrite magnetic rod to be classified, classifies the ferrite magnetic rod according to the inductance value, matches the inductance coil with corresponding turn number according to the experience value in each category, and the turn number and the inductance value have positive correlation, thus avoiding the large dispersion range of the inductance value. Then, the inductance value of the ferrite magnetic rod after winding is matched with the capacitance value of the capacitor, so that only the capacitor with a smaller capacitance value range needs to be matched, the full utilization of the stored capacitor is ensured, the product does not need to be wound again in the manufacturing process, the loss of the product is saved, and the first pass rate of the product is improved.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and drawings.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic overall structure diagram of a radio frequency tag identifier provided in an embodiment of the present invention;
FIG. 2 is an exploded view of FIG. 1;
fig. 3 is a schematic flow chart illustrating a method for manufacturing a radio frequency tag identifier according to an embodiment of the present invention;
wherein, 1 is a PCB board; 11 is a capacitor; 12 is an RFID chip; 2 is an inductance component; 21 is a ferrite magnetic rod; 22 is an inductance coil; 3 is a shell; 31 is an upper shell; 32 is a lower shell; and 33 is a hoop.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "far", "near", "front", "rear", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1
An embodiment of the present invention provides a radio frequency tag identifier, and as shown in fig. 1 and fig. 2, the radio frequency tag identifier may include: the RFID chip comprises a PCB (printed circuit board) 1, a capacitor 11 and an RFID chip 12 which are arranged on the PCB 1, and an inductance component 2 connected with the PCB 1;
the inductance assembly 2 may include: a ferrite bar 21 and an inductance coil 22 wound around the outside of the ferrite bar 21; two ends of the inductance coil 22 are respectively welded with the PCB 1;
the inductance value of the ferrite magnetic rod 21 is positively correlated with the number of turns of the inductance coil 22, and the inductance value of the ferrite magnetic rod 21 after winding is matched with the capacitance value of the capacitor 11.
The radio frequency tag identifier in the embodiment of the invention is a passive RFID electronic tag, and the antenna in the reader is used for cutting the magnetic induction line, converting electromagnetic energy into electric energy and further supplying power to the PCB in the radio frequency tag identifier so as to realize reading and writing of the radio frequency tag identifier.
The inventor has found that after obtaining the ferrite magnetic rod in the prior art, the magnetic rod is manufactured by a firing process, and has the disadvantages that the length and the size cannot be unified, the interval range is large, and the magnetic rod needs to be classified according to the size when manufacturing the marker, namely, the ferrite magnetic rod is classified into a plurality of categories according to the length and the size of the ferrite magnetic rod, for example, the ferrite magnetic rod is classified into a category A and a category B by taking the length of 120mm as a boundary, and each category corresponds to a fixed number of coil turns. Therefore, after the winding is finished, the capacitors need to be matched according to experience, if the capacitors are not matched, the capacitors with other capacitance values need to be rewound or matched, so that the problem that the storage of the capacitors with different capacitance values needs to be sufficient is involved, the material loss is increased inevitably due to the rewinding, the resource cost is increased due to the storage of the capacitors with different types, and the through rate of the radio frequency label identifier prepared by the method is low.
In the embodiment of the invention, the inventor proposes that the ferrite magnetic rods are not classified according to the sizes any more, and the corresponding winding mode is changed, namely two production and manufacturing processes of ferrite magnetic rod classification and winding are optimized. The inventor firstly detects the inductance value of the ferrite magnetic rod to be classified by using a special inductance value testing device, classifies the ferrite magnetic rod according to the inductance value, for example, the ferrite magnetic rod is classified into a class a and a class b, the inductance coil with corresponding turn number is matched according to the empirical value in each class, and the turn number and the inductance value have positive correlation, thus avoiding the large dispersion range of the inductance value. Then, the inductance value of the ferrite magnetic rod after winding is matched with the capacitance value of the capacitor, so that only the capacitor with a smaller capacitance value range needs to be matched, the full utilization of the stored capacitor is ensured, the product does not need to be wound again in the manufacturing process, the loss of the product is saved, and the first pass rate of the product is improved.
The ferrite bar is a metal oxide having ferromagnetism. Generally, the ferrite can be divided into three types, namely permanent magnetic ferrite, soft magnetic ferrite and gyromagnetic ferrite. In terms of electrical properties, ferrites have a much higher resistivity than metallic, alloyed magnetic materials, and also have higher dielectric properties. The magnetic properties of ferrites are also characterized by a high permeability at high frequencies. Therefore, ferrite has become a non-metallic magnetic material with wide application in the high-frequency weak-current field.
In an alternative embodiment, the matching relationship between the inductance value of the wound ferrite magnetic rod and the capacitance value of the capacitor is as follows:
wherein f is the inductance value of the ferrite magnetic rod after winding; l is the inductance value of the inductance coil; and C is the capacitance value of the capacitor.
In another alternative embodiment, for ease of winding, referring to fig. 2, the ferrite bar is provided with at least one cut plane parallel to the central axis of the bar. Because the general shape of ferrite bar magnet is cylindrical, when using machine equipment to carry out the wire winding, skid easily, the phenomenon that drops has appeared in the wire winding in-process has been avoided to the design of this tangent plane for the wire winding is more firm.
In another alternative embodiment, referring to fig. 2, the radio frequency tag identifier may further include: a detachable housing 3; the housing 3 is integrally injection molded.
Here, the case may be divided into three parts, i.e., an upper case 31, a lower case 32, and a yoke 33, and the ferrite bar, the inductor, and the PCB are assembled and then injection-molded. Above-mentioned shell is polypropylene and/or glass fiber material, and the shell is under environment such as indoor, outdoor, and life is not less than 30 years, and it possesses high low temperature resistant, sun-proof and ultraviolet resistance's characteristic, can use below in aquatic, plastics, soil, cement road, asphalt road, and this radio frequency tag identifier can carry out accurate recognition.
Based on the same inventive concept, the embodiment of the present invention further provides an RFID management system, which may include: a reader and at least one of the radio frequency tag identifiers; the radio frequency tag identifier is used for identifying managed material equipment; the reader is used for reading and writing the RFID chip in the radio frequency tag identifier.
The reader in the embodiment of the invention can comprise a reading and writing circuit and an antenna connected with the reading and writing circuit, the reader is provided with a power supply, when the reader is used, the antenna cuts the magnetic sensitivity of the radio frequency label identifier, and converts electromagnetic energy into electric energy of the radio frequency label to supply power for the PCB circuit board, so as to realize data receiving and transmitting in the RFID chip.
In an optional embodiment, the system may further include: a handheld terminal; the handheld terminal is connected with the reader through Bluetooth.
This handheld terminal can be smart machine such as palm, cell-phone, and can install the management and control software that manages the asset on this equipment, with read the ware and pass through the bluetooth and be connected the back, can read the data that read the ware and receive and dispatch to in patrol and examine personnel or equipment management personnel realize managing the asset that the sign has the radio frequency label identifier.
Based on the same inventive concept, the embodiment of the invention also provides application of the radio frequency tag identifier in an RFID management system.
The radio frequency tag identifier can be buried near key positions (such as corners, connection points, maintenance positions, crossing positions, embedding mode changes, port positions and the like) of underground cables and channels and underground cable and channel facilities (such as work wells, cable grounding devices and the like) during application, and can be used as identity marks of the underground cables and the channels, record attribute information (such as pipe diameters, pipes, laying dates, construction units, using dates and the like) and position information (facility coordinates, embedding depths and the like) of the underground cables and the channels so as to help accurately position, search, identify and manage the underground cables and the channels in the future, help to establish informationized data of the underground cables and the channels, lay a solid foundation for informationized management of the underground cables and the channels, and realize scientific management of the underground cables and the channels by means of an underground electronic identifier and a management system. Of course, the rfid tag may also be used in petroleum, petrochemical, and gas pipelines, municipal pipelines, railway underground facilities management, and the like, which is not limited in the embodiments of the present invention.
Example 2
An embodiment of the present invention provides a method for manufacturing a radio frequency tag identifier in embodiment 1, and as shown in fig. 3, the method may include the following steps:
and S301, classifying the ferrite magnetic rod according to the inductance value of the ferrite magnetic rod.
The inductance value of the ferrite magnetic rod to be classified is detected by using a special inductance value testing device, and the ferrite magnetic rod is classified according to the inductance value, for example, the ferrite magnetic rod is classified into a type and a type b.
And S302, matching the number of turns of the induction coil for the classified ferrite magnetic rod according to the induction value interval corresponding to the class.
The inductance coil with corresponding turn number is matched in each category according to the empirical value, and the turn number and the inductance value are in positive correlation, so that the large dispersion range of the inductance value is avoided.
And step S303, performing winding operation on the ferrite magnetic rod according to the number of turns of the inductance coil.
The number of turns of the excitation wire (inductor) on the surface of the bar magnet is also two.
And S304, detecting the inductance value of the wound ferrite magnetic rod, and determining the capacitance of the capacitance value matched with the wound ferrite magnetic rod according to the inductance value of the wound ferrite magnetic rod to prepare the radio frequency tag identifier.
And (4) sensing value test, namely using a special measuring sensing value device to test the current sensing value.
In an alternative embodiment, the inductance of the wound ferrite bar is used to match the capacitance of the capacitor, and the matching relationship is:
wherein f is the inductance value of the ferrite magnetic rod after winding; l is the inductance value of the inductance coil; and C is the capacitance value of the capacitor.
In another optional embodiment, after the step S304, the method may further include:
and step S305, cutting and ironing the line. The excitation wire after winding is cut off the redundant part according to a certain length, and soldering tin is scalded on the wire end part of the excitation wire, so that convenience is provided for the subsequent PCB welding procedure.
And S306, winding a high-temperature adhesive tape. The excitation wire needs to take the high temperature sticky tape to twine fixedly at upper and lower both ends after the bar magnet surface winding, prevents that the excitation is not hard up.
And step S307, assembling and welding the PCB. And according to a resonant frequency calculation formula, calculating a capacitance value according to the fixed frequency and the inductance value, welding a corresponding capacitor to the PCB, and welding two lines of the wound excitation wire to welding points of the PCB.
And step S308, performance testing. Using a performance detection device to read the distance according to a fixed frequency.
And step S309, encapsulating. And after the performance test is finished, the rubber material is wrapped by a rubber coating process to play a role in buffering falling and preventing performance failure.
And step S310, performance testing. After the rubber coating process, performance detection equipment is used, and whether the variation fluctuation is in a specified range or not is judged according to the fixed frequency reading distance.
And step S311, injection molding and plastic packaging. And after the shell of the radio frequency tag identifier is subjected to injection molding, putting the semi-finished product subjected to the rubber coating process into the injection molding shell, and performing plastic packaging through a plastic packaging process to obtain a final product style.
And step S312, testing the performance. After the injection molding and plastic packaging processes, performance detection equipment is used, and whether the distance is within a specified requirement range is judged according to the fixed frequency reading distance.
And step S313, laser coding and packaging. The surface of the product needs to be printed with relevant production information by laser and packaged according to the packaging requirements of the product.
The inventors of the present invention verified the feasibility of this process flow in production, as compared to tables 1 and 2 below.
TABLE 1 Prior to a change in the production Process
Table 2 following a change in the production process
After the production process is adjusted, the trial production is 50K, the loss of the excitation wire is 1.16 percent (including the loss of one product which cannot be completely wound at last), and the loss is reduced by half compared with the loss before. The one-time pass rate of the product is 98.79 percent, which is improved by 20 percent compared with the prior pass rate. The number of the winding coils of the capacitor can be adjusted according to the capacitance value, 50% more capacitor does not need to be purchased, and the inventory is reduced.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. The present disclosure is not limited to the precise structures that have been described above and shown in the drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A radio frequency tag identifier, comprising: the RFID chip comprises a PCB, a capacitor and an RFID chip which are arranged on the PCB, and an inductance component connected with the PCB;
the inductance assembly includes: the ferrite magnetic rod and the inductance coil wound outside the ferrite magnetic rod; two ends of the inductance coil are respectively welded with the PCB;
the inductance value of the ferrite magnetic rod is positively correlated with the number of turns of the inductance coil, and the inductance value of the ferrite magnetic rod after winding is matched with the capacitance value of the capacitor.
2. The radio-frequency tag identifier according to claim 1, wherein the matching relationship between the inductance value of the wound ferrite bar magnet and the capacitance value of the capacitor is:
wherein f is the inductance value of the ferrite magnetic rod after winding; l is the inductance value of the inductance coil; and C is the capacitance value of the capacitor.
3. The radio frequency tag identifier of claim 1, wherein said ferrite bar magnet is provided with at least one cut plane parallel to a central axis of said bar magnet.
4. A radio frequency tag identifier according to claims 1 to 3, further comprising:
a removable housing; the shell is integrally formed by injection molding.
5. The radio-frequency tag identifier of claim 4, wherein said housing is polypropylene and/or fiberglass.
6. An RFID management system, comprising: a reader and at least one radio frequency tag identifier as claimed in any one of claims 1 to 5;
the radio frequency tag identifier is used for identifying managed material equipment;
the reader is used for reading and writing the RFID chip in the radio frequency tag identifier.
7. The RFID management system of claim 6, further comprising: a handheld terminal; the handheld terminal is connected with the reader through Bluetooth.
8. A method of making a radio frequency tag identifier as claimed in any of claims 1 to 5, comprising:
classifying the ferrite magnetic rod according to the inductance value of the ferrite magnetic rod;
matching the number of turns of the induction coil for the classified ferrite magnetic rods according to the inductance value interval corresponding to the class;
carrying out winding operation treatment on the ferrite magnetic rod according to the number of turns of the inductance coil;
and detecting the inductance value of the wound ferrite magnetic rod, and determining the capacitance of the capacitance value matched with the wound ferrite magnetic rod according to the inductance value of the wound ferrite magnetic rod so as to prepare the radio frequency tag identifier.
9. The method according to claim 8, wherein the capacitance of the capacitance value is matched with the inductance value of the wound ferrite bar according to the matching relationship:
wherein f is the inductance value of the ferrite magnetic rod after winding; l is the inductance value of the inductance coil; and C is the capacitance value of the capacitor.
10. Use of a radio frequency tag identifier according to any of claims 1 to 5 in an RFID management system.
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| US20180159224A1 (en) * | 2016-12-02 | 2018-06-07 | Sumida Corporation | Antenna device and manufacturing method for the same |
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| CN101025795A (en) * | 2006-02-17 | 2007-08-29 | 李树群 | Tubular electronic label |
| US20180159224A1 (en) * | 2016-12-02 | 2018-06-07 | Sumida Corporation | Antenna device and manufacturing method for the same |
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