CN117273034A - Method and device for increasing identification distance of high-frequency electronic tag - Google Patents
Method and device for increasing identification distance of high-frequency electronic tag Download PDFInfo
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- CN117273034A CN117273034A CN202311292463.5A CN202311292463A CN117273034A CN 117273034 A CN117273034 A CN 117273034A CN 202311292463 A CN202311292463 A CN 202311292463A CN 117273034 A CN117273034 A CN 117273034A
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- 238000005859 coupling reaction Methods 0.000 claims description 17
- 238000006243 chemical reaction Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 12
- 238000004806 packaging method and process Methods 0.000 description 11
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
- G06K7/10316—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves using at least one antenna particularly designed for interrogating the wireless record carriers
- G06K7/10346—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves using at least one antenna particularly designed for interrogating the wireless record carriers the antenna being of the far field type, e.g. HF types or dipoles
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Abstract
The utility model relates to a method and a device for increasing the identification distance of a high-frequency electronic tag, belonging to the technical field of radio frequency identification; according to the method, n capacitance resonance coils are added between an electronic tag antenna and a high-frequency reader-writer antenna, and n is a positive integer; the device comprises an electronic tag and a high-frequency reader-writer, wherein the electronic tag comprises an electronic tag antenna, the high-frequency reader-writer comprises a reader-writer antenna, and a capacitance resonance coil is arranged between the electronic tag antenna and the reader-writer antenna; simple structure, simple to operate, improved electronic tags discernment distance.
Description
Technical Field
The utility model relates to a method and a device for increasing identification distance of a high-frequency electronic tag, and belongs to the technical field of radio frequency identification.
Background
Passive RFID has three common frequency bands, low Frequency (LF), high Frequency (HF) and Ultra High Frequency (UHF), two frequency bands of 125KHz and 134.2KHz, and 13.56MHz for high frequency. In low-frequency and high-frequency passive RFID systems, the energy and information transfer between reader and tag is achieved by the principle of near-field electromagnetic coupling. The reader-writer comprises an LC resonance antenna formed by a coil and a matching capacitor, and emits electromagnetic waves, and receives the electromagnetic waves emitted by the tag through the antenna; the high-frequency electronic tag comprises a resonant antenna consisting of a coil and a matching capacitor, receives electromagnetic waves emitted by the reader-writer, generates working current for supplying power through electromagnetic wave coupling, and realizes backward coupling of the electromagnetic waves through internal logic adjustment of matching degree so as to transmit information.
The communication distance between the reader and the electronic tag, commonly called as the read-write distance or the identification distance, is a main performance index of the low-frequency and high-frequency RFID system, and is related to parameters such as the transmitting power, the antenna efficiency, the receiving sensitivity, the wake-up threshold value of the tag, the antenna efficiency and the like of the reader.
The series capacitor LC resonance circuit works as follows: as shown in fig. 1a-c, when the capacitor discharges, the current in the circuit will gradually increase to a maximum value due to the self-inductance, and the charge on the plates will correspondingly gradually decrease to zero. In this process, the current excites a magnetic field in the self-inductance coil, and by the end of discharge, the electric field energy between the two plates of the capacitor is converted entirely into magnetic field energy in the coil. When the capacitor is discharged, the current in the circuit reaches a maximum. At this point, the capacitor is charged in the opposite direction, as shown in FIGS. 1 d-f. As the current gradually decreases to zero due to the self-inductance of the coil, the charge on the plates of the capacitor gradually increases to a maximum value accordingly. At the same time, the magnetic field energy is converted into electric field energy.
The capacitor is then discharged again through the coil, the current in the circuit gradually increases, but now the current is in the opposite direction to that in the case of the pre-discharge, and the electric field energy is converted again into magnetic field energy. Thereafter, the capacitor is charged again, reverting to the original state, and a complete resonance process is completed.
The technology of the low-frequency RFID reader-writer and the technology of the high-frequency RFID reader-writer are mature, and the technical scheme for improving the read-write distance through the parameters basically reaches the limit range. In some application fields, such as in some wine bottle cap packaging applications, where the bottle mouth is small and the cap is high, the optimization degree of the prior art is limited.
Under the condition that the maximum communication distance between the reader-writer and the electronic tag is already determined, in practical application, if the engineering requirement cannot be met, a multi-antenna mode is generally selected, and the area of the reader-writer tag is expanded by adding the antenna. For example, the utility model patent with chinese publication No. CN206058212U and the utility model patent with publication No. CN202632300U both describe the use of multiple antennas. There are two ways to add antennas, one is that each antenna is provided with an independent radio frequency read-write circuit, and the other is that a plurality of antennas share a group of radio frequency read-write circuits and are switched by an electronic switch. The connecting cable with a complex structure and a new antenna is required in any one of the above-mentioned connecting cables, which brings inconvenience to construction.
For another example, the utility model patent with chinese publication No. CN105095926a discloses a hierarchical remote active electronic tag and a method for identifying the same, wherein the remote identification is implemented by adopting an active electronic tag mode, and a battery, a controller and the like are added to the electronic tag, thereby increasing the complexity and the volume of the electronic tag.
Disclosure of Invention
The utility model aims to solve the technical problems that: the method and the device for increasing the recognition distance of the high-frequency electronic tag are simple in structure, convenient to install and capable of increasing the recognition distance of the electronic tag.
According to the method for increasing the identification distance of the high-frequency electronic tag, n capacitance resonance coils are added between the electronic tag antenna and the high-frequency reader-writer antenna, and n is a positive integer.
The capacitive resonance coil is used for transmitting inductive coupling to realize signal transmission, so that the total length between the electronic tag and the antenna of the reader-writer is increased, and the aim of improving the identification distance of the electronic tag is fulfilled.
Preferably, the capacitive resonance coil is arranged on a carrier of the electronic tag or a high-frequency reader-writer.
The device for increasing the recognition distance of the high-frequency electronic tag comprises the electronic tag and a high-frequency reader-writer, wherein the electronic tag comprises an electronic tag antenna, the high-frequency reader-writer comprises a reader-writer antenna, and a capacitance resonance coil is arranged between the electronic tag antenna and the reader-writer antenna.
Preferably, the high-frequency reader-writer further comprises a feeder line, and the feeder line is connected with the resonance capacitance of the reader-writer and the reader-writer antenna.
Preferably, the electronic tag further comprises a chip.
Preferably, the capacitive resonance coil comprises a primary resonance coil, and a primary resonance capacitor is connected in series with the primary resonance coil; after the reader-writer sends an 'inquiry' signal, the 'inquiry' signal is transmitted to the primary resonant coil in the form of magnetic field electromagnetic waves, the primary resonant coil is connected in series with a primary resonant capacitor with matched capacity, the electric charge generated by passing the instant magnetic force line under certain frequency through the primary resonant coil is stored in the resonant capacitor, meanwhile, the stored electric charge is released according to the same frequency, the electric charge returns to the primary resonant coil again, and the magnetic force line is generated to form a magnetic field of the reader-writer; when magnetic force lines generated by the magnetic field pass through a coil of the electronic tag antenna, magnetic force line signals are converted into current signals, and the current signals are processed by a chip radio frequency circuit of the electronic tag to finish receiving the signals; the signal returned by the electronic tag is firstly transmitted to the primary resonance coil through the coil of the electronic tag antenna, then transmitted to the coil of the reader-writer antenna, and the signal is converted through the radio frequency circuit of the reader-writer, so that the receiving of the electronic tag signal is completed.
Preferably, the capacitive resonance coil further comprises a secondary resonance coil, and a secondary resonance capacitor is connected in series with the secondary resonance coil.
Preferably, the capacitive resonance coil comprises a three-stage resonance coil, and a three-stage resonance capacitor is connected in series with the three-stage resonance coil.
Preferably, the capacitive resonance coil is arranged on a carrier of the electronic tag.
Preferably, the capacitive resonance coil is disposed on the high-frequency reader/writer.
Compared with the prior art, the utility model has the following beneficial effects:
the method and the device for increasing the identification distance of the high-frequency electronic tag have the advantages of simple structure, convenience in installation and capability of increasing the identification distance of the electronic tag.
Drawings
Fig. 1 is a schematic diagram of a working process of a series capacitor LC resonant circuit according to the background art, where a is when a capacitor is discharged, b is when the capacitor is discharged, c is when the capacitor is discharged, d is when the capacitor is charged in a reverse direction, e is when the capacitor is charged in a reverse direction, and f is when the capacitor is charged in a reverse direction;
FIG. 2 is a schematic structural diagram of an electronic tag according to the present utility model;
FIG. 3 is a schematic diagram of the structure of the high frequency reader-writer according to the present utility model;
FIG. 4 is a schematic diagram of the interrogation operation of a conventional electronic tag according to the present utility model;
FIG. 5 is a schematic diagram of the response operation of the conventional electronic tag according to the present utility model;
FIG. 6 is a schematic diagram of the interrogation operation of the electronic tag according to embodiment 1 of the present utility model;
fig. 7 is a schematic diagram of the response operation of the electronic tag according to embodiment 1 of the present utility model;
FIG. 8 is a schematic diagram of the interrogation operation of the electronic tag according to embodiment 2 of the present utility model;
fig. 9 is a schematic diagram of the response operation of the electronic tag according to embodiment 2 of the present utility model;
FIG. 10 is a schematic diagram of the operation of the weak secondary resonant coil according to embodiment 2 of the present utility model;
fig. 11 is a schematic diagram of an installation structure of an electronic tag according to embodiment 3 of the present utility model;
fig. 12 is a schematic view of an installation structure of an electronic tag according to embodiment 4 of the present utility model;
fig. 13 is a schematic diagram of an installation structure of an electronic tag according to embodiment 5 of the present utility model.
In the figure: 1. an electronic tag; 101. a chip; 102. an electronic tag antenna; 2. a high frequency reader; 3. a reader antenna; 4. a feed line; 5. magnetic lines of force; 6. a primary resonant coil; 601. a first-order resonance capacitor; 7. a secondary resonant coil; 701. a second-order resonance capacitor; 8. a three-stage resonant coil; 801. a third-stage resonance capacitor; 9. a weak secondary resonant coil; 10. a capacitive resonant coil; 11. and (5) packaging boxes.
Detailed Description
In order to solve the problems in the prior art, the application provides a method and a device for increasing the identification distance of a high-frequency electronic tag. In order to make the objects, technical solutions and advantages of the present utility model more apparent, embodiments of the present utility model will be described in further detail below.
As shown in fig. 2, is in the form of a high frequency electronic tag 1. Including an electronic tag antenna 102 and a chip 101. As shown in fig. 3, the high-frequency reader/writer 2 mainly includes a reader/writer antenna 3 and a feeder line 4 connected to the reader/writer 2.
For the electronic tag 1 and the reader-writer 2 in the low-frequency to high-frequency range, the antenna coils are all LC resonant circuits, and information interaction and identification are all completed through electromagnetic coupling between the resonant coils.
As shown in fig. 4, the reader-writer 2 generates a digital signal under the command of the upper computer, the digital signal is converted into a current signal by the radio frequency unit of the internal circuit, the current-voltage information of the carrier wave is sent by the carrier wave modulating circuit and is transmitted to the coil of the reader-writer antenna 3 by the feeder line 4, and when the carrier wave current flows through the coil of the reader-writer antenna 3, an electromagnetic wave is generated to form a magnetic field; the coil of the electronic tag antenna 102 entering the effective coupling range of the magnetic field is penetrated by the magnetic force line 5, and current is induced, so that on one hand, the current supplies power to the chip 101 of the electronic tag 1 to start the chip 101 to work, and on the other hand, the chip 101 demodulates a received current signal, and the logic circuit analyzes and converts the received current signal into a digital signal to finish the receiving of the signal of the reader-writer 2, namely the interrogation work is finished.
As shown in fig. 5, the electronic tag 1 receives an interrogation command of the reader-writer 2 according to the above process, the chip logic circuit sends out a response digital signal, the response digital signal is converted into a current signal through the signal modulation unit, the current signal is transmitted to the electronic tag antenna 102 by the radio frequency end inside the chip 101, and the current flows through the electronic tag antenna 102 to generate magnetic lines 5 with opposite directions, so as to form an electronic tag magnetic field; after the coil of the reader-writer antenna 3 senses the electromagnetic wave from the coil of the electronic tag antenna 102, the electromagnetic wave signal is converted into a current signal, the current signal is transmitted to the reader-writer 2, the logic circuit analyzes the digital signal, and the receiving of the signal of the electronic tag 1 is completed, namely the response work is completed.
The above is a description of the process of completing the interaction of the "inquiry" and "response" information between the electronic tag 1 and the reader/writer 2.
Aiming at the problems in the prior art, based on the working principle of completing 'inquiry' and 'response' between the electronic tag 1 and the reader-writer 2, the patent provides a method and a device for increasing the identification distance of a high-frequency electronic tag. The capacitive resonance coil 10 is used for transmitting inductive coupling to realize signal transmission, so that the total length between the electronic tag 1 and the reader-writer antenna 3 is increased, and the aim of improving the identification distance of the electronic tag is fulfilled.
The device for increasing the recognition distance of the high-frequency electronic tag comprises the electronic tag 1 and the high-frequency reader-writer 2, wherein the electronic tag 1 comprises an electronic tag antenna 102, the high-frequency reader-writer 2 comprises a reader-writer antenna 3, a capacitance resonance coil 10 is arranged between the electronic tag antenna 102 and the reader-writer antenna 3, n capacitance resonance coils 10 are arranged, and n is a positive integer.
Specifically, the capacitive resonance coil 10 may be one or two or three or four or five … …
Example 1
As shown in fig. 6 and 7, the present embodiment discloses a device for increasing the identification distance of a high-frequency electronic tag, which increases the distance of signal transmission when a primary resonance coil 6 is added between the electronic tag 1 and the reader/writer antenna 3.
The specific signal transmission process is as follows: firstly, after the reader-writer 2 sends an 'inquiry' signal, the 'inquiry' signal is transmitted to the primary resonance coil 6 in the form of magnetic field electromagnetic waves, the primary resonance coil 6 is connected in series with a primary resonance capacitor 601 with matched capacity, so that the electric charge generated by the instant magnetic force lines at a certain frequency passing through the coil can be stored in the primary resonance capacitor 601, meanwhile, the stored electric charge can be released according to the same frequency, the electric charge returns to the primary resonance coil 6 again, and the magnetic force lines are generated to form a magnetic field of the reader-writer; when the magnetic force lines generated by the magnetic field pass through the electronic tag coil, magnetic force line signals are converted into current signals, and the current signals are processed by the radio frequency circuit of the chip 101 of the electronic tag 1 to finish receiving the signals.
Similarly, as shown in fig. 7, the signal returned by the electronic tag 1 is first transferred to the primary resonant coil 6 through the electronic tag antenna 102, then transferred to the reader-writer antenna 3, and the signal is converted by the reader-writer radio frequency circuit, so as to complete the receiving of the signal of the electronic tag 1.
The primary resonance coil 6 plays a role of a bridge in the transmission process of 'query' and 'response' signals of the reader-writer 2 and the electronic tag 1. The read identification distance is increased from the original LO to the sum of LO and LR.
Example 2
As shown in fig. 8 and 9, this embodiment discloses a device for increasing the identification distance of a high-frequency electronic tag, and after adding a primary resonance coil 6, a secondary resonance coil 7 and a tertiary resonance coil 8 between the electronic tag 1 and the reader antenna 3, it can be seen that the reading identification distance between the electronic tag 1 and the reader antenna 3 is increased from the original LO to the sum of LO and L1, L2, LR.
The effective inductive distance of the two resonant coils is dependent on the coil with the weakest coupling capacity.
As shown in fig. 10, when the secondary resonant coil 7 in fig. 9 is replaced with the weak secondary resonant coil 9, it can be seen that although two adjacent resonant coils are the same-frequency resonant coils, when the coupling inductances are different, the effective inductances L10 and L20 of the two adjacent resonant coils depend on the coil having the weakest coupling ability, i.e., the weak secondary resonant coil 9. The weak secondary resonance coil 9 starts to generate the same-frequency resonance after being excited by the coil electromagnetic wave of the reader-writer antenna 3 through the tertiary resonance coil 8, and forms a new electromagnetic field area at one side far away from the high-frequency reader-writer 2; the adjacent primary resonant coil 6 can be activated in this area and continue to transmit electromagnetic coupling signals to the electronic tag 1, which electronic tag 1 returns information via the return coupling signals. The back coupling signals are transmitted to the antenna coil 3 of the reader-writer along the directions of the primary resonance coil 6, the weak secondary resonance coil 9 and the tertiary resonance coil 8, so that the signal transmission is completed.
The total implemented signal coupling transfer distance is equal to the sum of L0, L10, L20 and LR, where L10 and L20 are smaller than L1 and L2 in fig. 9, that is, because the electromagnetic coupling capability of the weak secondary resonance coil 9 is lower, the induction distance is shorter.
Example 3
In this embodiment, the device for increasing the identification distance of the high-frequency electronic tag disclosed in embodiment 1 or 2 is applied to bottle packages.
In bottle-based packaging applications, a personalized design with a relatively large design volume and a relatively unique appearance is often encountered as shown in fig. 11. From the anti-counterfeiting perspective, the merchant requires that the electronic tag 1 be placed inside a bottle cap, and cannot be used in a transferring manner before opening the bottle. However, for high-frequency and NFC electronic tags, the electronic tag 1 must be close to the tag for reading or identification when the tag is read by a high-frequency handset or an NFC mobile phone.
2. For the bottle cap with a larger design volume and a relatively far top part from the electronic tag 1, the electronic tag 1 cannot be effectively read or identified by a high-frequency handset or an NFC mobile phone.
3. As shown in fig. 11, if a capacitive resonance coil 10 is added to the top of the bottle cap, the reading distance of the electronic tag 1 inside the bottle cap can be significantly increased. When the high-frequency handset or the NFC handset is used for scanning at the top of the bottle cap, the electronic tag 1 can be read or identified, so that the problem that the reading distance of the high-frequency electronic tag 1 is short is solved.
Example 4
Unlike example 3, the following is: in this embodiment, the device for increasing the identification distance of the high-frequency electronic tag disclosed in embodiment 1 or 2 is applied to packaging of bottles and boxes.
The bottle and box packaging combination is applied:
1. in bottle and box packaging applications, a design where the cap is farther from the top of the package 11 is often encountered. From the anti-counterfeiting angle, the merchant requires to place the high-frequency electronic tag 1 inside the bottle cap, and before opening the packaging box 11, the merchant can scan the electronic tag 1 inside the bottle cap by using a high-frequency handset or an NFC mobile phone to realize information inquiry of the commodity. When the electronic tag 1 is read by a high-frequency handset or an NFC mobile phone, the electronic tag must be close to the electronic tag for reading or identification.
2. For the mode that the bottle is combined with the box package and the top of the package box is far away from the bottle cap electronic tag 1, the electronic tag cannot be effectively read or identified by a high-frequency handset or an NFC mobile phone.
3. As shown in fig. 12, in the application mode of the bottle and box packaging, if a capacitor resonance coil 10 is added to the top of the packaging box 11, the reading distance of the electronic tag 1 inside the bottle cap can be obviously increased. When the high-frequency handset or the NFC handset is used for scanning at the top of the bottle cap, the electronic tag 1 can be read or identified, so that the problem that the reading distance of the high-frequency electronic tag 1 is short is solved.
Example 5
Unlike example 4, the following is:
as shown in fig. 13, a first-stage resonance coil 6 is added at the top of the bottle cap, and a second-stage resonance coil 7 is added at the top of the packaging box 11, so that the reading distance of the electronic tag 1 inside the bottle cap is further increased.
Example 6
Unlike example 5, the following is:
the first-stage resonance coil 6 and the second-stage resonance coil 7 are added at the top of the bottle cap, the third-stage capacitance resonance coil 8 is added at the top of the packaging box 11, and the reading distance of the electronic tag 1 in the bottle cap is further increased.
The above examples are merely illustrative of preferred embodiments of the present utility model and are not intended to be limiting, and therefore the present utility model is not limited to the embodiments described in the detailed description, but rather falls within the scope of the present utility model as other embodiments can be derived by those skilled in the art from the technical solutions of the present utility model.
Claims (10)
1. A method for increasing the identification distance of a high-frequency electronic tag is characterized in that n capacitance resonance coils (10) are added between an electronic tag antenna (102) and a high-frequency reader-writer antenna (3), and n is a positive integer.
2. Method for increasing the identification distance of a high frequency electronic tag according to claim 1, characterized in that the capacitive resonance coil (10) is arranged on the carrier of the electronic tag or on the high frequency reader; the coupling distance of each adjacent capacitive resonance coil (10) depends on the capacitive resonance coil (10) with the weakest coupling capacity.
3. A device for increasing the identification distance of a high-frequency electronic tag, which is applied to the method for increasing the identification distance of the high-frequency electronic tag according to any one of claims 1-2, and is characterized by comprising an electronic tag (1) and a high-frequency reader-writer (2), wherein the electronic tag (1) comprises an electronic tag antenna (102), the high-frequency reader-writer (2) comprises a reader-writer antenna (3), and a capacitive resonance coil (10) is arranged between the electronic tag antenna (102) and the reader-writer antenna (3).
4. A device for increasing the identification distance of a high frequency electronic tag according to claim 3, characterized in that the high frequency reader/writer (2) further comprises a feeder (4), the feeder (4) connecting the reader/writer (2) and the resonance capacitor (301) of the reader/writer antenna (3).
5. A device for increasing the identification distance of a high frequency electronic tag according to claim 3, characterized in that the electronic tag (1) further comprises a chip (101).
6. The device for increasing the identification distance of the high-frequency electronic tag according to claim 5, wherein the capacitive resonance coil (10) comprises a primary resonance coil (6), and a primary resonance capacitor (601) is connected in series with the primary resonance coil (6); after the reader-writer (2) sends out an interrogation signal, the interrogation signal is transmitted to the primary resonant coil (6) in the form of magnetic field electromagnetic waves, the primary resonant coil (6) is connected in series with a primary resonant capacitor (601) with matched capacity, the electric charge generated by passing the instant magnetic force line under a certain frequency through the primary resonant coil (6) is stored in the resonant capacitor (601), meanwhile, the stored electric charge is released according to the same frequency, the electric charge returns to the primary resonant coil (6) again, and the magnetic force line is generated to form a magnetic field of the reader-writer; when magnetic force lines (5) generated by the magnetic field pass through a coil of an electronic tag antenna (102), magnetic force line signals are converted into current signals, and the current signals are processed by a chip (101) radio frequency circuit of the electronic tag (1) to finish receiving the signals; the signal returned by the electronic tag (1) is firstly transmitted to the first-stage resonant coil (6) through the coil of the electronic tag antenna (102), then transmitted to the coil of the reader-writer antenna (3), and the signal of the electronic tag (1) is received through the signal conversion of the reader-writer radio frequency circuit.
7. The device for increasing the identification distance of the high-frequency electronic tag according to claim 6, wherein the capacitive resonance coil (10) further comprises a secondary resonance coil (7), and a secondary resonance capacitor (701) is connected in series with the secondary resonance coil (7).
8. The device for increasing the identification distance of the high-frequency electronic tag according to claim 7, wherein the capacitive resonance coil (10) comprises a three-stage resonance coil (8), and a three-stage resonance capacitor (801) is connected in series with the three-stage resonance coil (8).
9. A device for increasing the identification distance of a high frequency electronic tag according to claim 3, characterized in that the capacitive resonance coil (10) is arranged on the carrier of the electronic tag (1).
10. A device for increasing the identification distance of a high frequency electronic tag according to claim 3, characterized in that the capacitive resonance coil (10) is arranged on the high frequency reader/writer (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311292463.5A CN117273034A (en) | 2023-10-08 | 2023-10-08 | Method and device for increasing identification distance of high-frequency electronic tag |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311292463.5A CN117273034A (en) | 2023-10-08 | 2023-10-08 | Method and device for increasing identification distance of high-frequency electronic tag |
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| CN117273034A true CN117273034A (en) | 2023-12-22 |
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| CN202311292463.5A Pending CN117273034A (en) | 2023-10-08 | 2023-10-08 | Method and device for increasing identification distance of high-frequency electronic tag |
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