Rfid tag, method of controlling the same, and rfid system

Abstract

The present disclosure relates to an RFID tag, a control method thereof and an RFID system, the RFID tag comprising a chip, a switch and an antenna assembly, the antenna assembly comprising at least three-dimensional coils, output ends of the coils being connected to input ends of the switch, output ends of the switch being connected to input ends of the chip, and output ends of the chip being connected to the coils, one coil, the switch and the chip forming a signal loop. The technical solution of the present disclosure effectively solves the technical problem that the traditional RFID tag has limitations in placement and installation positions and cannot realize omnidirectional identification.

Description

Technical Field

[0001] This disclosure relates to the field of radio frequency identification technology, and in particular to an RFID tag and its control method, and an RFID system. Background Technology

[0002] Radio Frequency Identification (RFID), also known as electronic tags or wireless RFID, is a communication technology that identifies specific targets and reads / writes related data via radio signals without requiring mechanical or optical contact between the identification system and the target. Commonly used passive RFID technologies include low-frequency (125kHz–134.2kHz), high-frequency (13.56MHz), and ultra-high-frequency (860MHz–960MHz). As a crucial component of an RFID system, the performance of RFID tags significantly impacts the efficiency and quality of the entire RFID system.

[0003] In related technologies, RFID tags obtain energy through electromagnetic induction coils for short-term power supply. Therefore, the relative position of the coil on the tag and the reader determines the accuracy of identification. Traditional RFID systems have significant limitations on the placement and installation location of RFID tags and cannot achieve omnidirectional identification. Summary of the Invention

[0004] This disclosure provides an RFID tag and its control method, as well as an RFID system, to solve the technical problem that traditional RFID tags have limitations in placement and installation locations, making it impossible to achieve omnidirectional identification.

[0005] To this end, in a first aspect, this disclosure provides an RFID tag including a chip, a switch, and an antenna assembly. The antenna assembly includes coils in at least three dimensions. The output of the coils is connected to the input of the switch, the output of the switch is connected to the input of the chip, and the output of the chip is connected to the coils. A coil, a switch, and a chip form a signal loop.

[0006] In one possible implementation, the antenna assembly includes a first coil, a second coil, and a third coil, which are arranged perpendicularly to each other.

[0007] In one possible implementation, the first coil, the second coil, and the third coil have the same center.

[0008] In one possible implementation, the first coil, the second coil, and the third coil have the same radius.

[0009] In one possible implementation, the RFID tag further includes a logic circuit, the input of which is connected to a chip, and the output of which is connected to a switch.

[0010] Secondly, this disclosure also provides a method for controlling the above-mentioned RFID tag, including:

[0011] Detect whether the RFID tag has entered the reader's detection range;

[0012] If so, the control switch will conduct the signal circuits formed by the coil and the chip in different dimensions in the first cycle, and at the same time the control chip will acquire and compare the signal values ​​formed by the coil in different dimensions to obtain the signal circuit corresponding to the maximum signal value.

[0013] The control switch activates the signal circuit corresponding to the maximum signal value, enabling communication between the RFID tag and the reader.

[0014] In one possible implementation, the antenna assembly includes a first coil, a second coil, and a third coil, and the control chip acquires and compares the signal values ​​formed by the coils in different dimensions, including:

[0015] The control chip acquires and compares the signal values ​​of the first coil and the second coil, and obtains the maximum intermediate signal value;

[0016] The control chip acquires the signal value of the third coil, compares the signal value of the third coil with the intermediate signal value, and obtains the signal circuit corresponding to the maximum signal value.

[0017] In one possible implementation, the first cycle is 1ms to 10ms.

[0018] Thirdly, this disclosure also provides an RFID system, characterized in that it includes an RFID tag, a reader, and a system antenna as described above, wherein the reader is configured to send radio frequency energy to the RFID tag and receive and process radio frequency information transmitted by the system antenna, and the system antenna is configured to receive and transmit radio frequency information sent by the RFID tag.

[0019] Fourthly, the disclosure also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the RFID tag control method described above.

[0020] According to the RFID tag and its control method and RFID system provided in this disclosure, the RFID tag includes a chip, a switch, and an antenna assembly. The antenna assembly includes at least three-dimensional coils. The output end of the coil is connected to the input end of the switch, the output end of the switch is connected to the input end of the chip, and the output end of the chip is connected to the coil. A coil, switch, and chip form a signal loop. This technical solution optimizes the specific structure of the RFID tag, enabling it to maintain high signal strength and high stability in all directions to communicate with the reader. This achieves omnidirectional identification and communication of the RFID tag, solving the limitations of placement and installation location in traditional RFID systems and reducing the cost of the RFID system. Specifically, the RFID tag is configured as a combination of at least a chip, a switch, and an antenna assembly. The antenna assembly includes at least three-dimensional coils to enable signal identification of the RFID tag in different directions. Each coil can be connected to the chip through the switch, forming a signal loop. By identifying and judging the signal strength in different signal loops, the group of coils with the strongest signal strength is selected to connect the signal loop. This improves the accuracy and sensitivity of communication between the RFID tag and the reader, thereby enhancing the performance of the entire RFID system. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, those skilled in the art can obtain other drawings based on these drawings without creative effort. In addition, in the drawings, the same parts use the same reference numerals, and the drawings are not drawn to scale.

[0022] Figure 1 A three-dimensional structural diagram of an RFID tag provided in an embodiment of this disclosure;

[0023] Figure 2 A circuit diagram of an RFID tag provided in an embodiment of this disclosure;

[0024] Figure 3 This is a schematic flowchart of the RFID tag control method provided in an embodiment of this disclosure.

[0025] Explanation of reference numerals in the attached figures:

[0026] 100. Chips;

[0027] 200. Switching components;

[0028] 300. Antenna assembly; 310. First coil; 320. Second coil; 330. Third coil;

[0029] 400. Logic circuits. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. Based on the embodiments of this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.

[0031] See Figure 1 and Figure 2 This disclosure provides an RFID tag including a chip 100, a switch 200, and an antenna assembly 300. The antenna assembly 300 includes at least three coils. The output of the coil is connected to the input of the switch 200, the output of the switch 200 is connected to the input of the chip 100, and the output of the chip 100 is connected to the coil. A coil, a switch 200, and a chip 100 form a signal loop.

[0032] In this embodiment, by optimizing the specific structure of the RFID tag, the RFID tag can maintain high signal strength and high stability in all directions to complete communication with the reader, realizing omnidirectional identification and communication of the RFID tag. This solves the problems of placement and installation location limitations of RFID tags in traditional RFID systems and reduces the cost of the RFID system.

[0033] Specifically, the RFID tag is configured as a combination of at least a chip 100, a switch 200, and an antenna assembly 300. The antenna assembly 300 includes coils in at least three dimensions to enable signal recognition of the RFID tag from different orientations, increasing the detection area of ​​the RFID tag. Each coil can be connected to the chip 100 via the switch 200, forming a signal loop. Then, by identifying and judging the signal strength in different signal loops, the group of coils with the strongest signal strength is selected to connect the signal loop. This improves the accuracy and sensitivity of communication between the RFID tag and the reader, thereby enhancing the performance of the entire RFID system.

[0034] For example, but not limited to, the switching element 200 is an RF switch.

[0035] In one possible implementation, the antenna assembly 300 includes a first coil 310, a second coil 320, and a third coil 330, which are arranged vertically in pairs.

[0036] In this embodiment, the specific structure and configuration of the antenna assembly 300 are optimized. Specifically, the antenna assembly 300 is configured to include at least a combination of a first coil 310, a second coil 320, and a third coil 330, with the three coils located in three dimensions to form a pairwise perpendicular positional relationship. In this way, the RFID tag can achieve omnidirectional identification of the reader with a minimum number of coils, which is beneficial for the miniaturization of RFID tags.

[0037] In other embodiments, the antenna assembly 300 may also include three or more coils, such as four, six, or eight, with at least one coil arranged in one dimension. When two or more coils are arranged in one dimension, the two or more coils are arranged in parallel.

[0038] In one possible implementation, the first coil 310, the second coil 320, and the third coil 330 have the same center.

[0039] In this embodiment, the positions of the first coil 310, the second coil 320, and the third coil 330 are optimized. Specifically, the centers of the first coil 310, the second coil 320, and the third coil 330 are made to be the same, thereby reducing the space occupied by the RFID tag and facilitating the miniaturization of the RFID tag.

[0040] Of course, in other embodiments, the centers of the first coil 310, the second coil 320 and the third coil 330 may be different, but it must be ensured that the three coils intersect in pairs.

[0041] In one possible implementation, the first coil 310, the second coil 320, and the third coil 330 have the same radius.

[0042] In this embodiment, the dimensions of the first coil 310, the second coil 320, and the third coil 330 are optimized. Specifically, the radii of the first coil 310, the second coil 320, and the third coil 330 are configured to be the same size, so that the signal strength of the RFID tag is the same in all directions, which is beneficial to improving the detection range of the RFID tag.

[0043] In one example, the first coil 310, the second coil 320, and the third coil 330 can be scaled up or down proportionally according to actual operational needs to meet the requirements of different customers.

[0044] In other embodiments, the radii of the first coil 310, the second coil 320, and the third coil 330 may also be different. The coil size can be appropriately reduced in dimensions where a weaker detection signal is required to save costs, while the coil size can be appropriately increased in dimensions where a stronger detection signal is required to rationally plan the space occupied by the coils in different dimensions.

[0045] In one possible implementation, the RFID tag further includes a logic circuit 400, the input of which is connected to the chip 100, and the output of which is connected to the switch 200.

[0046] In this embodiment, the specific structure and configuration of the antenna assembly 300 are optimized. Specifically, the RFID tag is configured as a combination of at least a chip 100, a switch 200, an antenna assembly 300, and a logic circuit 400. The logic circuit 400 integrates a comparison circuit for comparing different loop signal values ​​and a control circuit for controlling the conduction of the determining coil in the antenna assembly 300 and the chip 100. This intelligent control of the signal loop conduction of the RFID tag improves its sensitivity and accuracy.

[0047] See Figure 3 Secondly, this disclosure also provides a method for controlling the above-mentioned RFID tag, including:

[0048] Step S1: Detect whether the RFID tag has entered the reader's detection range;

[0049] Step S2: If yes, then control the switching device to conduct the signal circuits formed by the coil and the chip in different dimensions in the first cycle, and at the same time control the chip to acquire and compare the signal values ​​formed by the coil in different dimensions to obtain the signal circuit corresponding to the maximum signal value.

[0050] Step S3: Control the switch to turn on the signal circuit corresponding to the maximum signal value, and complete the communication between the RFID tag and the reader.

[0051] In this embodiment, the communication method for RFID tags is optimized. Specifically, it first detects whether the RFID tag has entered the reader's detection range. If not, the RFID tag does not operate; if it has, the RFID tag can obtain radio frequency energy under the reader's radio frequency power and be activated. In this state, the RFID tag can transmit its own encoding information through its built-in antenna component 300 to communicate with the reader. Since the placement and installation position of the RFID tag will affect its recognition accuracy with the reader, this embodiment obtains the signal values ​​received by the coil in different dimensions and compares the signal values ​​in different dimensions to select the maximum signal value. The signal loop between the coil and the chip 100 corresponding to the maximum signal value is defined as the optimal signal loop, so that the RFID tag completes communication with the reader using the optimal signal loop, thereby improving the detection success rate and accuracy of the RFID tag.

[0052] In one example, the first period is 1ms to 10ms. For example, but not limited to, the first period is 5ms.

[0053] In one possible implementation, the antenna assembly includes a first coil, a second coil, and a third coil, and the control chip acquires and compares the signal values ​​formed by the coils in different dimensions, including:

[0054] Step S21: The control chip acquires and compares the signal values ​​of the first coil and the second coil, and obtains the maximum intermediate signal value;

[0055] Step S22: The control chip acquires the signal value of the third coil, compares the signal value of the third coil with the intermediate signal value, and obtains the signal circuit corresponding to the maximum signal value.

[0056] In this embodiment, the steps for acquiring and comparing signal values ​​in different dimensions are optimized. Specifically, the first coil 310 and chip 100 are connected via switch 200, and the first signal value in the signal loop is acquired through chip 100. Then, the connection between the first coil 310 and chip 100 is disconnected, and the second coil 320 and chip 100 are connected via switch 200, and the second signal value in the signal loop is acquired through chip 100. The magnitudes of the first and second signals are compared, and the larger value is selected as the intermediate signal value. Next, the connection between the second coil 320 and chip 100 is disconnected, and the third coil 330 and chip 100 are connected via switch 200, and the third signal value in the signal loop is acquired through chip 100. The magnitudes of the third signal value and the intermediate signal value are compared, and the larger value is selected as the maximum signal value. The signal loop of the coil and chip 100 corresponding to the maximum signal value is the signal loop of the required RFID tag.

[0057] Thirdly, this disclosure also provides an RFID system, characterized in that it includes an RFID tag, a reader, and a system antenna as described above, wherein the reader is configured to send radio frequency energy to the RFID tag and receive and process radio frequency information transmitted by the system antenna, and the system antenna is configured to receive and transmit radio frequency information sent by the RFID tag.

[0058] In this embodiment, the specific structure of the RFID tag is the same as that in the above embodiments. Since the control method of this RFID tag adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, and will not be described in detail here.

[0059] Specifically, the system antenna includes a transmitting antenna and a receiving antenna. The reader transmits a radio frequency signal of a certain frequency within a certain distance range around it through the transmitting antenna. When the RFID tag enters the working area of ​​the transmitting antenna, the RFID tag generates an induced current, the RFID tag acquires capability, and transmits its own encoded information through the built-in antenna assembly 300 of the RFID tag. Then, the receiving antenna receives the carrier information transmitted from the built-in antenna assembly 300 and transmits it to the reader through the receiver's modulator. The reader modulates and decodes the received signal and transmits the processed signal to the back-end main control system for further processing. The main control system determines the legality of the RFID tag based on logical operations. If legal, it issues a command signal to execute communication between the RFID tag and the reader; if illegal, it disconnects the reader and the RFID tag.

[0060] Fourthly, this disclosure also provides a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the RFID tag control method described above. The RFID tag control method specifically refers to the above embodiments. Since this computer-readable storage medium adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, and will not be elaborated further here.

[0061] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0062] The above description is merely a specific embodiment of this disclosure, enabling those skilled in the art to understand or implement it. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this disclosure. Therefore, this disclosure is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An RFID tag, characterized in that, The device includes a chip, a switching device, and an antenna assembly. The antenna assembly includes at least three coils. The output of the coils is connected to the input of the switching device. The output of the switching device is connected to the input of the chip. The output of the chip is connected to the coils. The coils, the switching device, and the chip form a signal loop. The antenna assembly includes a first coil, a second coil, and a third coil, wherein the first coil, the second coil, and the third coil are arranged perpendicularly to each other. The chip is used to acquire the signal values ​​of the coil in different dimensions and determine the circuit corresponding to the maximum signal value; The switch is used to activate the signal circuit corresponding to the maximum signal value, so as to enable communication between the RFID tag and the reader.

2. The RFID tag according to claim 1, characterized in that, The first coil, the second coil, and the third coil have the same center.

3. The RFID tag according to claim 2, characterized in that, The first coil, the second coil, and the third coil have the same radius.

4. The RFID tag according to claim 1, characterized in that, The RFID tag also includes a logic circuit, the input of which is connected to the chip, and the output of which is connected to the switch.

5. A control method for an RFID tag as described in any one of claims 1 to 4, characterized in that, include: Detect whether the RFID tag has entered the reader's detection range; If so, the switching device is controlled to conduct the signal circuits formed by the coil and the chip in different dimensions in the first cycle, and the chip is controlled to acquire and compare the signal values ​​formed by the coil in different dimensions to obtain the signal circuit corresponding to the maximum signal value. The switch is controlled to conduct the signal circuit corresponding to the maximum signal value, thereby completing the communication between the RFID tag and the reader.

6. The control method according to claim 5, characterized in that, The antenna assembly includes a first coil, a second coil, and a third coil. Controlling the chip to acquire and compare signal values ​​formed by the coils in different dimensions includes: The chip is controlled to acquire and compare the signal values ​​of the first coil and the second coil, and to obtain the maximum intermediate signal value; The chip is controlled to acquire the signal value of the third coil, and the signal value of the third coil is compared with the intermediate signal value to obtain the signal circuit corresponding to the maximum signal value.

7. The control method according to claim 6, characterized in that, The first cycle is 1ms to 10ms.

8. An RFID system, characterized in that, Includes an RFID tag, a reader, and a system antenna as described in any one of claims 1 to 4, wherein the reader is configured to transmit radio frequency energy to the RFID tag and receive and process radio frequency information transmitted by the system antenna, and the system antenna is configured to receive and transmit the radio frequency information transmitted by the RFID tag.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the RFID tag control method as described in any one of claims 5 to 7.

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