Radio frequency tag assembly, master radio frequency tag and slave radio frequency tag

Abstract

The application discloses a radio frequency tag assembly for determining the matching relationship of articles, and a master radio frequency tag and a slave radio frequency tag. The radio frequency tag assembly comprises the master radio frequency tag and the slave radio frequency tag. The master radio frequency tag comprises a first radio frequency tag chip, a first connecting port and a first antenna. The first radio frequency tag chip receives a radio frequency reading signal sent to the master radio frequency tag and outputs a driving voltage at a voltage output port. The slave radio frequency tag comprises a second radio frequency tag chip, a switch module, a second connecting port and a second antenna. The switch module controls the second antenna to be coupled to an antenna port of the second radio frequency tag chip in response to the voltage at a voltage input port being higher than a conduction voltage. The first connecting port can be connected to the second connecting port so that the voltage output port of the first radio frequency tag chip is coupled to the voltage input port of the switch module. The application can conveniently obtain the corresponding relationship between the matching articles.

Description

Technical Field

[0001] This application relates to the field of radio technology, and in particular to an RFID tag assembly, a master RFID tag, and a slave RFID tag for determining article matching relationships. Background Technology

[0002] Radio Frequency Identification (RFID) is a non-contact identification technology that uses radio frequency to communicate data in order to identify target objects and obtain relevant data.

[0003] A wireless system based on RFID technology typically includes a reader (or interrogator) and one or more electronic tags (or transponders). A reader is a device that can read information from electronic tags and can be designed to be handheld or fixed. An electronic tag consists of a coupling element and a chip; the chip stores the tag's information, and the tag can be attached to an object to identify it.

[0004] Based on their energy supply method, electronic tags can be divided into passive electronic tags, active electronic tags, and semi-active electronic tags. Passive electronic tags receive radio frequency signals emitted by a reader and transmit the information stored in the chip using energy obtained from induced current. Active electronic tags actively transmit signals at a specific frequency.

[0005] RFID operating frequencies can be categorized into low frequency (LF), high frequency (HF), ultra-high frequency (UHF), and microwave (MW). The corresponding representative operating frequencies are: low frequency below 135kHz, high frequency 13.56MHz, ultra-high frequency 860MHz-960MHz, and microwave 2.4GHz or 5.8GHz.

[0006] The characteristics of RFID technology have led to its widespread application in asset management, with an increasing number of enterprises using RFID for asset inventory. This has resulted in greater demands for RFID technology, including the matching and management of items. Traditional RFID systems can identify individual items, but they cannot obtain information on the matching relationships between managed items, such as network cables, fiber optic cable connectors, memory slots, and special tool accessories, making it impossible to determine the correspondence between terminals and connecting wires. Furthermore, in these scenarios, the small size of the managed items necessitates the use of small RFID tags, resulting in short identification distances. Traditional RFID methods struggle to address these issues, thus requiring more effective implementation technologies. Summary of the Invention

[0007] One objective of this application is to provide an RFID tag assembly for determining item matching relationships, as well as a master RFID tag and a slave RFID tag, to solve the problem of item matching relationship identification.

[0008] One aspect of this application provides an RFID tag assembly for determining article matching relationships, comprising: a master RFID tag and a slave RFID tag. The master RFID tag includes a first RFID tag chip, a first connection port, and a first antenna. The first RFID tag chip has an antenna port and a voltage output port. The first antenna is coupled to the antenna port of the first RFID tag chip. In response to receiving an RFID read signal sent to the master RFID tag from its antenna port, the first RFID tag chip outputs a drive voltage at its voltage output port. The slave RFID tag includes a second RFID tag chip, a switch module, a second connection port, and a second antenna. The second RFID tag chip has an antenna port. The switch module has a voltage input port and an RFID connection port. The second antenna includes a first branch and a second branch. The first terminal of the RFID connection port of the switch module and the first branch of the second antenna are respectively coupled to the two terminals of the antenna port of the second RFID tag chip. The second terminal of the RFID connection port of the switch module is coupled to the second branch of the second antenna. In response to the voltage at its voltage input port being higher than the conduction voltage, the switch module conducts the first terminal and the second terminal of its RFID connection port. The first connection port can be connected to the second connection port, and after the first connection port and the second connection port are connected, the voltage output port of the first RFID tag chip is coupled to the voltage input port of the switch module.

[0009] In some embodiments, after the first connection port is connected to the second connection port, the first antenna is further coupled to the second antenna.

[0010] In some embodiments, the main RFID tag further includes a first physical identification device, which is coupled to the voltage output port of the first RFID tag chip. The first physical identification device generates a first physical identification signal in response to the voltage of the voltage output port of the first RFID tag chip being higher than a first trigger voltage.

[0011] In some embodiments, the first physical identification device is a light-emitting device, and the first physical identification signal is an optical signal.

[0012] In some embodiments, the first antenna includes a first branch and a second branch, the first branch and the second branch of the first antenna being respectively coupled to two terminals of the antenna port of the first radio frequency tag chip.

[0013] In some embodiments, after the first connection port is connected to the second connection port, the first branch or the second branch of the first antenna is coupled to the first branch or the second branch of the second antenna.

[0014] In some embodiments, the number of first branches or second branches of the first antenna is one or more, and the number of first branches or second branches of the second antenna is one or more. After the first connection port and the second connection port are connected, one or more first branches or second branches of the first antenna are coupled to one or more first branches or second branches of the second antenna.

[0015] In some embodiments, the RFID tag further includes a voltage regulator module, which includes a voltage input port and a voltage output port. The voltage regulator module is configured to regulate the voltage input to its voltage input port and output the regulated voltage at its voltage output port. After the first connection port and the second connection port are connected, the voltage output port of the first RFID tag chip is coupled to the voltage input port of the voltage regulator module.

[0016] In some embodiments, the voltage input port of the switching module is coupled to the voltage output port of the voltage regulator module.

[0017] In some embodiments, the RFID tag further includes a second physical identification device coupled to the voltage input port of the switching module, the second physical identification device generating a second physical identification signal in response to the voltage at the voltage input port of the switching module being higher than the second trigger voltage.

[0018] In some embodiments, the second physical identification device is a light-emitting device, and the second physical identification signal is an optical signal.

[0019] In some embodiments, the second RFID chip, in response to receiving an RFID inventory signal from its antenna port, outputs an RFID response signal through its antenna port, the RFID response signal including identification information from the RFID tag.

[0020] In a second aspect, this application provides a master RFID tag that can be used in conjunction with a slave RFID tag to determine an item matching relationship. The slave RFID tag includes a second RFID chip, a switch module, a second connection port, and a second antenna. The second RFID chip has an antenna port, the switch module has a voltage input port and an RFID connection port, and the second antenna includes a first branch and a second branch. The first terminal of the RFID connection port of the switch module and the first branch of the second antenna are respectively coupled to the two terminals of the antenna port of the second RFID chip, and the second terminal of the RFID connection port of the switch module is coupled to the second branch of the second antenna. The switch module conducts the first and second terminals of its RFID connection port in response to a voltage at its voltage input port being higher than a conduction voltage. The master RFID tag includes: a first RFID chip having an antenna port and a voltage output port; the first RFID chip outputting a drive voltage at its voltage output port in response to receiving an RFID read signal sent to the master RFID tag from its antenna port; a first connection port that can be connected to the second connection port of the slave RFID tag; and a first antenna coupled to the antenna port of the first RFID chip. After the first connection port is connected to the second connection port of the slave RFID tag, the voltage output port of the first RFID chip is coupled to the voltage input port of the switch module.

[0021] In a third aspect, this application provides a secondary RFID tag that can be used in conjunction with a primary RFID tag to determine an article matching relationship. The primary RFID tag includes a first RFID chip, a first antenna, and a first connection port. The first RFID chip has a voltage output port and an antenna port. The first antenna is coupled to the antenna port of the first RFID chip. In response to receiving an RFID read signal sent to the primary RFID tag from its antenna port, the first RFID chip outputs a drive voltage at its voltage output port. The secondary RFID tag includes: a second RFID chip having an antenna port; a second antenna including a first branch and a second branch; a switch module having a voltage input port and an RFID connection port. The first terminal of the RFID connection port of the switch module and the first branch of the second antenna are respectively coupled to the two terminals of the antenna port of the second RFID chip, and the second terminal of the RFID connection port of the switch module is coupled to the second branch of the second antenna. In response to the voltage at its voltage input port being higher than the conduction voltage, the switch module conducts the first and second terminals of its RFID connection port; and a second connection port that can be connected to the first connection port of the primary RFID tag. After the first connection port and the second connection port are connected, the voltage output port of the first RFID chip is coupled to the voltage input port of the switch module.

[0022] The RFID tag component of this application can easily obtain the correspondence between matching items.

[0023] The above is an overview of this application, and there may be simplifications, generalizations, and omissions of details. Therefore, those skilled in the art should recognize that this section is merely illustrative and not intended to limit the scope of this application in any way. This overview section is neither intended to identify the key or essential features of the claimed subject matter nor to serve as an aid in determining the scope of the claimed subject matter. Attached Figure Description

[0024] The above and other features of this application will become more fully clear through the following description and appended claims, in conjunction with the accompanying drawings. It is understood that these drawings depict only a few embodiments of the application and should not be construed as limiting the scope of the application. The application will be described more clearly and in more detail through the use of the drawings.

[0025] Figure 1 A schematic diagram of a wireless system based on RFID technology according to an embodiment of the present disclosure is shown;

[0026] Figure 2 A structural block diagram of an RFID tag assembly 20 for determining item matching relationships according to an embodiment of the present disclosure is shown. Detailed Implementation

[0027] The technical solution of this application will now be described in detail with reference to the accompanying drawings. In the drawings, similar symbols generally denote similar components unless the context otherwise requires. The specific embodiments described in the following detailed description, drawings, and claims are not intended to limit the scope of protection of this application. Other embodiments may be adopted, and modifications, combinations, equivalent substitutions, or other changes may be made without departing from the spirit or scope of the subject matter of this application, all of which explicitly constitute part of the content of this application and are included within the scope of protection of this application.

[0028] In practical applications, it is sometimes necessary to manage a large number of item matching situations. Item matching refers to the correspondence between one item A and another item B. This correspondence can be the connection relationship between items A and B, for example, items A and B are the connection ends of two interconnected cables.

[0029] When there are a large number of matching items, let the number of items A and B both be N. Let's denote these items A as a1, a2, ..., a N Item B is represented as b1, b2, ..., b N For each item a i The item it matches is represented as b. P(i)Where P(1), P(2), ..., P(N) are the sequences obtained by rearranging the order of sequence 1, 2, ..., N. P(·) can be understood as a permutation function. How to obtain this permutation function, that is, for each item a... i How can I easily obtain the matching item b? P(i) Or for each item b j How to easily obtain matching items? This is a difficult problem. Here, i and j represent the indices of item A and item B respectively, and P... -1 (·) represents the inverse function of P(·). Obtaining this correspondence is particularly difficult when the items are small.

[0030] To address the aforementioned problems, this application discloses an RFID tag assembly, comprising a master RFID tag and a slave RFID tag. The RFID tag assembly of this disclosure employs dual RFID tag technology, with the master and slave RFID tags respectively attached to one of two matched items A and B to identify items A and B. The master and slave RFID tags are connected, and the slave RFID tag corresponding to the master RFID tag is obtained by activating the slave RFID tag, thereby determining the correspondence between the items identified by the master and slave RFID tags. Furthermore, this disclosure further achieves a better working distance by allowing the master and slave RFID tags to utilize each other's antennas to obtain extended antennas.

[0031] Figure 1 A schematic diagram of a wireless system based on RFID technology according to an embodiment of the present disclosure is shown.

[0032] See Figure 1 The wireless system in this embodiment includes a reader 10 and multiple radio frequency tag components 20 for determining item matching relationships.

[0033] Each RFID tag assembly 20 includes a master RFID tag 200 and a slave RFID tag 300, which have a connection port for interconnection. Both the master RFID tag 200 and the slave RFID tag 300 are independently operable RFID tags; that is, even when not connected, both can send corresponding information to the reader 10 in response to receiving an RFID read signal transmitted by the reader 10. However, when operating independently, the working distance of the master RFID tag 200 and the slave RFID tag 300 is relatively small due to antenna size limitations. Here, the working distance refers to the distance at which the reader and the RFID tag can communicate with each other. However, according to some embodiments of this disclosure, when the master RFID tag 200 and the slave RFID tag 300 are connected together, either RFID tag can utilize the antenna of the other RFID tag to obtain a larger extended antenna, thereby significantly increasing the working distance of the master RFID tag 200 and the slave RFID tag 300.

[0034] The reader 10 has the function of identifying RFID tags. When the reader 10 needs to obtain the slave RFID tag 300 corresponding to a master RFID tag 200, it can transmit an RFID reading signal, which contains the identification information of the master RFID tag 200. In this disclosure, the identification information of the RFID tag refers to the tag's identifier or other information that can uniquely identify the RFID tag. Upon receiving the RFID reading signal containing its identification information, the master RFID tag 200 performs corresponding processing, causing the slave RFID tag 300 to feed back its identification information to the reader 10 via an RFID signal. In this way, the slave RFID tag 300 corresponding to the master RFID tag 200 can be identified.

[0035] Figure 2 A structural block diagram of an RFID tag assembly 20 for determining item matching relationships, according to an embodiment of this disclosure, is shown. Figure 2 As shown, the RFID tag assembly 20 includes a master RFID tag 200 and a slave RFID tag 300.

[0036] The main RFID tag 200 includes a first RFID tag chip 210, a first connection port 220, and a first antenna 230. The first RFID tag chip 210 has an antenna port 211 and a voltage output port 212, and the first antenna 230 is coupled to the antenna port 211 of the first RFID tag chip 210.

[0037] The first RFID chip 210 is a passive tag, and it stores the identification information of the main RFID tag 200. When the first antenna 230 receives the RFID signal emitted by the reader 10, the antenna port 211 can generate an induced voltage, driving the first RFID chip 210 to operate. The first RFID chip 210 further determines whether the received RFID signal is an RFID read signal sent to the main RFID tag 200. In response to receiving an RFID read signal sent to the main RFID tag 200, the first RFID chip 210 outputs a driving voltage at its voltage output port 212. If the first RFID chip 210 determines that the received RFID signal is not sent to the main RFID tag 200, it ignores the RFID signal and does not output a driving voltage. The reader 10 can carry the identification information of the main RFID tag 200 in its transmitted RFID signal, and the main RFID tag 200 can determine whether it is the receiver of the RFID signal based on this identification information.

[0038] Antenna port 211 includes two terminals 211a and 211b, and voltage output port 212 includes two terminals 212a and 212b.

[0039] The first antenna 230 is an RFID antenna, which can be used to receive or transmit radio frequency signals. The shape and installation method of the first antenna 230 can be determined according to factors such as the area, shape, and operating frequency of the main RFID tag 200. The first antenna 230 includes a first branch 230a and a second branch 230b. The first branch 230a and the second branch 230b are respectively coupled to two terminals of the antenna port 211 of the first RFID tag chip 210. For example, the first branch 230a is coupled to terminal 211a, and the second branch 230b is coupled to terminal 211b.

[0040] Depending on the operating frequency, in some embodiments, the first branch 230a and the second branch 230b are interconnected or form a single structure; in other embodiments, the first branch 230a and the second branch 230b are separate structures. The number of first branches 230a can be one or more. When there are more than one, these first branches 230a are coupled together, meaning that the radio frequency signal sensed by each first branch can be coupled to one or more other first branches. Similarly, the number of second branches 230b can also be one or more. When there are more than one, these second branches 230b are also coupled together.

[0041] The first connection port 220 is used to connect the terminals of the master RFID tag 200 to the corresponding terminals of the slave RFID tag 300.

[0042] In some embodiments, the main RFID tag 200 further includes a first physical identification device 240, which is coupled to the voltage output port 212 of the first RFID chip 210. The first physical identification device 240 generates a first physical identification signal in response to a voltage at the voltage output port 212 of the first RFID chip 210 exceeding a first trigger voltage. As described above, after receiving an RFID signal sent to the main RFID tag 200, the first RFID chip 210 outputs a driving voltage at its voltage output port 212, which can trigger the first physical identification device 240 to generate the first physical identification signal. The first trigger voltage can be determined based on the magnitude of the driving voltage output at the voltage output port 212 of the first RFID chip 210; for example, the first trigger voltage can be slightly lower than the driving voltage output at the voltage output port 212. The first physical identification signal can be various types of perceptible signals, such as light, sound, or vibration. Preferably, the first physical identification device 240 is a light-emitting device, such as a light-emitting diode, and the first physical identification signal is an optical signal to facilitate rapid positioning of the main RFID tag 200.

[0043] The RFID tag 300 includes a second RFID tag chip 310, a switch module 330, a second connection port 340, and a second antenna 350. The second RFID tag chip 310 has an antenna port 311, the switch module 330 has a voltage input port 331 and an RFID connection port 332, and the second antenna 350 includes a first branch 350a and a second branch 350b. The RFID connection port 332 includes a first terminal 332a and a second terminal 332b.

[0044] The second RFID chip 310 is a passive tag. It operates when a sufficient induced voltage is generated at its antenna port 311. The second RFID chip 310 stores the identification information from the RFID tag 300. In response to receiving an RFID inventory signal from its antenna port 311, the second RFID chip 310 outputs an RFID response signal through its antenna port 311 and transmits it through an extended antenna composed of the first antenna 230 and the second antenna 350, as a response to the RFID inventory signal. The RFID inventory signal does not carry the identification information from the RFID tag 300; however, the RFID response signal output by the second RFID chip 310 carries this identification information. After receiving the RFID response signal transmitted by the second RFID chip 310, the reader 10 can determine which RFID tag 300 emitted the signal based on the identification information carried in the RFID response signal.

[0045] The switch module 330 is a controllable RF switch. In response to a voltage between terminals 331a and 331b of its voltage input port 331 being higher than the turn-on voltage, it turns on the first terminal 332a and the second terminal 332b of its RF connection port 332. If the voltage between terminals 331a and 331b of the voltage input port 331 is lower than the turn-on voltage, then the first terminal 332a and the second terminal 332b of its RF connection port 332 are not turned on. The turn-on voltage is determined according to the specific implementation of the switch module 330, but should be set not higher than the drive voltage output from the voltage output port of the first RF tag chip 210. The switch module 330 can be implemented using a metal-oxide-semiconductor field-effect transistor (MOSFET), which is characterized by ultra-low power consumption and low loss.

[0046] The first terminal 332a of the RF connection port 332 of the switch module 330 and the first branch 350a of the second antenna 350 are respectively coupled to the two terminals of the antenna port 311 of the second RFID chip 310. For example, the first terminal 332a of the RF connection port 332 of the switch module 330 is coupled to the terminal 311a of the antenna port 311 of the second RFID chip 310, and the first branch 350a of the second antenna 350 is coupled to the terminal 311b. The second terminal 332b of the RF connection port 332 of the switch module 330 is coupled to the second branch 350b of the second antenna 350.

[0047] It is understood that when the voltage between the two terminals 331a and 331b of the voltage input port 331 of the switch module 330 is higher than the turn-on voltage, the first terminal 332a and the second terminal 332b of the RF connection port 332 are turned on, thereby coupling the antenna port 311 of the second RF tag chip 310 to the second antenna 350; when the voltage between the two terminals 331a and 331b of the voltage input port 331 of the switch module 330 is lower than the turn-on voltage, the first terminal 332a and the second terminal 332b of the RF connection port 332 are not turned on, thereby disconnecting the antenna port 311 of the second RF tag chip 310 from the second antenna 350.

[0048] The second antenna 350 is an RFID antenna, which can be used to receive or transmit radio frequency signals. Similar to the first antenna 230, the shape and installation method of the second antenna 350 can be determined based on factors such as the area, shape, and operating frequency of the RFID tag 300. In some embodiments, the first branch 350a and the second branch 350b of the second antenna 350 are connected together or are an integral structure; in some embodiments, the first branch 350a and the second branch 350b of the second antenna 350 are separate structures. The number of first branches 350a can be one or more, and when there are more than one, these first branches 350a are coupled together. The number of second branches 350b can also be one or more, and when there are more than one, these second branches 350b are also coupled together.

[0049] The second connection port 340 is used to connect to the first connection port 220 of the main RFID tag 200 to connect the terminals of the main RFID tag 200 to the corresponding terminals of the slave RFID tag 300. After the first connection port 220 and the second connection port 340 are connected, the voltage output port 212 of the first RFID chip 210 of the main RFID tag 200 is coupled to the voltage input port 331 of the switching module 330 of the slave RFID tag 300. Figure 2 As shown, the voltage output port 212 of the first RFID chip 210 corresponds to the port composed of the VDD terminal and the GND terminal of the first connection port 220, and the voltage input port 331 of the switch module 330 corresponds to the port composed of the VDD terminal and the GND terminal of the second connection port 340.

[0050] In some embodiments, after the first connection port 220 is connected to the second connection port 340, the first antenna 230 of the master RFID tag 200 is further coupled to the second antenna 350 of the slave RFID tag 300. At this time, both the master RFID tag 200 and the slave RFID tag 300 can utilize the antenna of the other RFID tag to obtain a larger extended antenna, thereby significantly increasing the operating distance of the master RFID tag 200 and the slave RFID tag 300. Figure 2 As shown, one or more branches of the first antenna 230 of the main RFID tag 200 correspond to terminals ANT1, ANT2, ..., ANTn of the first connection port 220, and one or more branches of the second antenna 350 of the RFID tag 300 correspond to terminals ANT1, ANT2, ..., ANTn of the second connection port 340, where n is the number of terminals to which the first antenna 230 and the second antenna 350 are interconnected.

[0051] In some embodiments, the RFID tag 300 further includes a second physical identification device 360, which is coupled to the voltage input port 331 of the switching module 330. The second physical identification device 360 ​​generates a second physical identification signal in response to a voltage at the voltage input port 331 of the switching module 330 exceeding a second trigger voltage. Similar to the first physical identification signal, the second physical identification signal can be various types of perceptible signals, such as light, sound, or vibration. Preferably, the second physical identification device 360 ​​is a light-emitting device, and the second physical identification signal is an optical signal, to facilitate rapid positioning of the RFID tag 300. It should be noted that the second physical identification device 360 ​​can be a different device than the first physical identification device 240; therefore, the second trigger voltage can be different from the first trigger voltage, and the type of the second physical identification signal can also be different from the type of the first physical identification signal.

[0052] Because the driving voltage output by the first RFID chip 210 is affected by the induced voltage input to its antenna port 211, when the induced voltage input to the antenna port 211 is low, the driving voltage output by the first RFID chip 210 may be unstable, causing the switching module 330 to operate unstablely, and further causing the second RFID tag to malfunction. To reduce the impact of unstable driving voltage, in some embodiments, a voltage regulator module 320 can be added to the RFID tag 300. The voltage regulator module 320 includes a voltage input port 321 and a voltage output port 322. The voltage regulator module 320 is configured to regulate the voltage input to its voltage input port 321 and output the regulated voltage at its voltage output port 322. After the first connection port 220 of the main RFID tag 200 is connected to the second connection port 340 of the slave RFID tag 300, the voltage output port 212 of the first RFID chip 210 is coupled to the voltage input port 321 of the voltage regulator module 320. The voltage regulator module 320 includes a rectifier-divider circuit and an energy storage circuit, which in some embodiments can be implemented using an RC-inductor circuit.

[0053] For ease of understanding by those skilled in the art, the following will be used as an example. Figure 1 Taking one application scenario of the wireless system consisting of the reader 10 and the radio frequency tag component 20 shown as an example, the working principle and working process of the radio frequency tag component 20 of this disclosure will be further explained.

[0054] Each RFID tag assembly 20, consisting of a master RFID tag 200 and a slave RFID tag 300, can pre-store identification information, with each tag's identification information corresponding to one of the two matched items. The master RFID tag 200 and slave RFID tag 300 are respectively attached to one of the two matched items, and the first connection port 220 of the master RFID tag 200 and the second connection port 340 of the slave RFID tag 300 are connected together. For ease of description, the item with the master RFID tag 200 is referred to as the master item, and the item with the slave RFID tag 300 is referred to as the slave item. However, those skilled in the art will understand that referring to items as master and slave items is merely for convenience, and the two matched items may not have a master-slave relationship. The identification information stored in the master RFID tag 200 corresponds to the master item, and the identification information stored in the slave RFID tag 300 corresponds to the slave item.

[0055] After the reader 10 transmits the radio frequency reading signal, all main radio frequency tags 200 that are within the working distance range of the reader 10 can receive the radio frequency reading signal transmitted by the reader 10. The radio frequency reading signal carries the identification information of the main radio frequency tag 200 corresponding to the main item to be queried.

[0056] Upon receiving the RFID read signal, the first RFID chip 210 of the main RFID tag 200 determines whether the main RFID tag 200 is the receiver of the signal based on the identification information contained in the RFID read signal. If so, the first RFID chip 210 outputs a driving voltage at its voltage output port 212. If not, the voltage output port 212 does not output a driving voltage.

[0057] Since the first RFID chip 210 is coupled to the voltage input port 331 of the switching module 330 of the slave RFID tag 300 at its voltage output port 212, when the first RFID chip 210 outputs a driving voltage, this driving voltage controls the first terminal 332a and the second terminal 332b of the RF connection port 332 of the switching module 330 to conduct, so that the second antenna 350 is coupled to the antenna port 311 of the second RFID chip 310. At this time, the slave RFID tag 300 can receive the RF inventory signal emitted by the reader 10 and transmit an RF response signal carrying the identification information of the slave RFID tag 300 through the second antenna. After receiving the RF response signal, the reader 10 can determine which slave RFID tag 300 emitted the RF response signal based on the identification information carried in the RF response signal, thereby determining the slave item matched with the master item.

[0058] Reader 10 can transmit radio frequency (RF) reading signals multiple times. Each RF reading signal carries the identification information of the master RF tag 200 corresponding to a different master item, thus sequentially determining the slave items matched with that master item. After reader 10 has traversed all master items using the above method, it obtains the slave items matched with each master item.

[0059] Furthermore, after the first connection port 220 of the master RFID tag 200 is connected to the second connection port 340 of the slave RFID tag 300, the first antenna 230 of the master RFID tag 200 is further coupled to the second antenna 350 of the slave RFID tag 300. The first antenna 230 and the second antenna 350 are then mutually coupled to form an extended antenna. This extended antenna is shared by both the master RFID tag 200 and the slave RFID tag 300, effectively increasing the aperture of each antenna. Therefore, the working distance of both the master RFID tag 200 and the slave RFID tag 300 can be significantly increased compared to their independent working distances.

[0060] Those skilled in the art can understand and implement other modifications to the disclosed embodiments by reading the specification, the disclosure, the drawings, and the appended claims. Such modifications, without departing from the essence of the claims, fall within the scope of protection of the claims. In the claims, the word "comprising" does not exclude other elements and steps, and the words "a" or "an" do not exclude a plurality. In practical applications of this application, a single part or module may perform the functions of multiple technical features referenced in the claims. Any reference numerals in the claims should not be construed as limiting the scope.

Claims

1. An RFID tag assembly for determining item matching relationships, characterized in that, The radio frequency tag component includes: A main RFID tag includes a first RFID chip, a first connector, and a first antenna. The first RFID chip has an antenna port and a voltage output port. The first antenna is coupled to the antenna port of the first RFID chip. In response to receiving an RFID read signal sent to the main RFID tag from its antenna port, the first RFID chip outputs a drive voltage at its voltage output port. The RFID tag includes a second RFID chip, a switch module, a second connection port, and a second antenna. The second RFID chip has an antenna port, and the switch module has a voltage input port and an RFID connection port. The second antenna includes a first branch and a second branch. The first terminal of the RFID connection port of the switch module and the first branch of the second antenna are respectively coupled to the two terminals of the antenna port of the second RFID chip. The second terminal of the RFID connection port of the switch module is coupled to the second branch of the second antenna. The switch module turns on the first and second terminals of its RFID connection port in response to the voltage at its voltage input port being higher than the turn-on voltage. The first connection port can be connected to the second connection port, and after the first connection port is connected to the second connection port, the voltage output port of the first RFID chip is coupled to the voltage input port of the switch module.

2. The radio frequency tag assembly according to claim 1, characterized in that, After the first connection port is connected to the second connection port, the first antenna is further coupled to the second antenna.

3. The radio frequency tag assembly according to claim 1, characterized in that, The main RFID tag also includes a first physical identification device, which is coupled to the voltage output port of the first RFID tag chip. The first physical identification device generates a first physical identification signal in response to the voltage of the voltage output port of the first RFID tag chip being higher than a first trigger voltage.

4. The radio frequency tag assembly according to claim 3, characterized in that, The first physical identification device is a light-emitting device, and the first physical identification signal is an optical signal.

5. The radio frequency tag assembly according to claim 1, characterized in that, The first antenna includes a first branch and a second branch, and the first branch and the second branch of the first antenna are respectively coupled to two terminals of the antenna port of the first radio frequency tag chip.

6. The radio frequency tag assembly according to claim 5, characterized in that, After the first connection port is connected to the second connection port, the first branch or the second branch of the first antenna is coupled to the first branch or the second branch of the second antenna.

7. The radio frequency tag assembly according to claim 6, characterized in that, The first antenna has one or more first branches or second branches, and the second antenna has one or more first branches or second branches. After the first connection port and the second connection port are connected, one or more first branches or second branches of the first antenna are coupled to one or more first branches or second branches of the second antenna.

8. The radio frequency tag assembly according to claim 1, characterized in that, The RFID tag also includes a voltage regulator module, which includes a voltage input port and a voltage output port. The voltage regulator module is configured to regulate the voltage input to its voltage input port and output the regulated voltage at its voltage output port. After the first connection port and the second connection port are connected, the voltage output port of the first RFID tag chip is coupled to the voltage input port of the voltage regulator module.

9. The radio frequency tag assembly according to claim 8, characterized in that, The voltage input port of the switching module is coupled to the voltage output port of the voltage regulator module.

10. The radio frequency tag assembly according to claim 1, characterized in that, The RFID tag also includes a second physical identification device, which is coupled to the voltage input port of the switching module. The second physical identification device generates a second physical identification signal in response to the voltage at the voltage input port of the switching module being higher than the second trigger voltage.

11. The radio frequency tag assembly according to claim 10, characterized in that, The second physical identification device is a light-emitting device, and the second physical identification signal is an optical signal.

12. The radio frequency tag assembly according to claim 1, characterized in that, The second RFID chip, in response to receiving an RFID inventory signal from its antenna port, outputs an RFID response signal through its antenna port, the RFID response signal including the identification information from the RFID tag.

13. A master radio frequency tag, characterized in that, The master RFID tag can be used in conjunction with a slave RFID tag to determine item matching relationships. The slave RFID tag includes a second RFID chip, a switch module, a second connection port, and a second antenna. The second RFID chip has an antenna port. The switch module has a voltage input port and an RFID connection port. The second antenna includes a first branch and a second branch. The first terminal of the RFID connection port of the switch module and the first branch of the second antenna are respectively coupled to the two terminals of the antenna port of the second RFID chip. The second terminal of the RFID connection port of the switch module is coupled to the second branch of the second antenna. The switch module turns on the first and second terminals of its RFID connection port in response to a voltage at its voltage input port being higher than the turn-on voltage. The master RFID tag includes: A first RFID chip has an antenna port and a voltage output port. In response to receiving an RFID read signal sent to the main RFID tag from its antenna port, the first RFID chip outputs a drive voltage at its voltage output port. A first connection port, which can be connected to the second connection port from the RFID tag; and The first antenna is coupled to the antenna port of the first RFID tag chip. Wherein, after the first connection port is connected to the second connection port of the RFID tag, the voltage output port of the first RFID tag chip is coupled to the voltage input port of the switch module.

14. The main RFID tag according to claim 13, characterized in that, After the first connection port is connected to the second connection port from the RFID tag, the first antenna is further coupled to the second antenna.

15. The main RFID tag according to claim 13, characterized in that, The main RFID tag also includes a first physical identification device, which is coupled to the voltage output port of the first RFID tag chip. The first physical identification device generates a first physical identification signal in response to the voltage of the voltage output port of the first RFID tag chip being higher than a first trigger voltage.

16. The main RFID tag according to claim 15, characterized in that, The first physical identification device is a light-emitting device, and the first physical identification signal is an optical signal.

17. The main RFID tag according to claim 13, characterized in that, The first antenna includes a first branch and a second branch, and the first branch and the second branch of the first antenna are respectively coupled to two terminals of the antenna port of the first radio frequency tag chip.

18. The main RFID tag according to claim 17, characterized in that, After the first connection port is connected to the second connection port, the first branch or the second branch of the first antenna is coupled to the first branch or the second branch of the second antenna.

19. The main RFID tag according to claim 18, characterized in that, The first antenna has one or more first branches or second branches, and the second antenna has one or more first branches or second branches. After the first connection port and the second connection port are connected, one or more first branches or second branches of the first antenna are coupled to one or more first branches or second branches of the second antenna.

20. A radio frequency tag, characterized in that, The slave RFID tag can be used in conjunction with the master RFID tag to determine item matching relationships. The master RFID tag includes a first RFID chip, a first antenna, and a first connection port. The first RFID chip has a voltage output port and an antenna port. The first antenna is coupled to the antenna port of the first RFID chip. In response to receiving an RFID read signal sent to the master RFID tag from its antenna port, the first RFID chip outputs a drive voltage at its voltage output port. The slave RFID tag includes: The second RFID tag chip has an antenna port; The second antenna includes a first branch and a second branch; A switching module has a voltage input port and an RF connection port. The first terminal of the RF connection port of the switching module and the first branch of the second antenna are respectively coupled to the two terminals of the antenna port of the second RF tag chip. The second terminal of the RF connection port of the switching module is coupled to the second branch of the second antenna. The switching module turns on the first terminal and the second terminal of its RF connection port in response to the voltage of its voltage input port being higher than the turn-on voltage. The second connection port can be connected to the first connection port of the main RFID tag. Wherein, after the first connection port is connected to the second connection port, the voltage output port of the first RFID chip is coupled to the voltage input port of the switch module.

21. The radio frequency tag according to claim 20, characterized in that, After the first connection port is connected to the second connection port, the first antenna is further coupled to the second antenna.

22. The radio frequency tag according to claim 20, characterized in that, The RFID tag also includes a voltage regulator module, which includes a voltage input port and a voltage output port. The voltage regulator module is configured to regulate the voltage input to its voltage input port and output the regulated voltage at its voltage output port. After the first connection port and the second connection port are connected, the voltage output port of the first RFID tag chip is coupled to the voltage input port of the voltage regulator module.

23. The radio frequency tag according to claim 22, characterized in that, The voltage input port of the switching module is coupled to the voltage output port of the voltage regulator module.

24. The RFID tag according to claim 20, characterized in that, The RFID tag also includes a second physical identification device, which is coupled to the voltage input port of the switching module. The second physical identification device generates a second physical identification signal in response to the voltage at the voltage input port of the switching module being higher than the second trigger voltage.

25. The RFID tag according to claim 24, characterized in that, The second physical identification device is a light-emitting device, and the second physical identification signal is an optical signal.

26. The RFID tag according to claim 20, characterized in that, The second RFID chip, in response to receiving an RFID inventory signal from its antenna port, outputs an RFID response signal through its antenna port, the RFID response signal including the identification information from the RFID tag.

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