RFID tags

Abstract

This application provides an RFID tag, which includes an RFID chip and an antenna body. The RFID chip includes a first port group and a second port group. The antenna body includes a first antenna body and a second antenna body. The first antenna body includes a first impedance matching network, and the second antenna body includes a second impedance matching network and an antenna radiator. The antenna radiator is connected to the first and second impedance matching networks and is disposed around the first and second impedance matching networks. The first port group is connected to the first impedance matching network, and the second port group is connected to the second impedance matching network. There is an overlapping area between the first and second impedance matching networks. The RFID tag of this application can reduce its size.

Description

Technical Field

[0001] This application relates to the field of radio frequency identification technology, and in particular to an radio frequency tag. Background Technology

[0002] Radio Frequency Identification (RFID) technology is a communication technology that can identify specific targets and read / write related data via radio signals without requiring mechanical or optical contact between the identification system and the target. RFID tags, as a crucial component of RFID systems, significantly impact the overall performance of the system. One of the main factors affecting RFID tag performance is antenna size; therefore, to ensure RFID system performance, current RFID tags tend to be excessively large. Summary of the Invention

[0003] This application provides an RFID tag to solve the problem of excessively large RFID tag size.

[0004] To address the aforementioned problems, this application discloses an RFID tag method, wherein the RFID tag includes:

[0005] RF chip and antenna body;

[0006] The radio frequency chip includes a first port group and a second port group;

[0007] The antenna body includes a first antenna body and a second antenna body. The first antenna body includes a first impedance matching network section, and the second antenna body includes a second impedance matching network section and an antenna radiator section. The antenna radiator section is connected to the first impedance matching network section and the second impedance matching network section, and the antenna radiator section is disposed around the first impedance matching network section and the second impedance matching network section.

[0008] The first port group is connected to the first impedance matching network section, and the second port group is connected to the second impedance matching network section, wherein there is an overlapping area between the first impedance matching network section and the second impedance matching network section.

[0009] Optionally, the radio frequency chip is a dual-port radio frequency chip, wherein the ports in the first port group and the second port group are a set of diagonally intersecting ports, and the first port group and the second port group are connected to the antenna body and operate independently with a phase difference of 90°.

[0010] Optionally, the diagonally crossed ports in the first port group are connected to the first impedance matching network; the first antenna body includes a first connecting portion and a second connecting portion, the second antenna body includes a third connecting portion and a fourth connecting portion, the diagonally crossed ports in the second port group are connected to the first connecting portion and the second connecting portion, and the second impedance matching network is connected to the third connecting portion and the fourth connecting portion. By connecting the first connecting portion and the second connecting portion to the third connecting portion and the fourth connecting portion, the second port group is connected to the second impedance matching network.

[0011] Optionally, the antenna radiator includes a first antenna radiator, a second antenna radiator, and a third antenna radiator. The first antenna body further includes a fifth connecting portion, and the second antenna body further includes a sixth connecting portion, a seventh connecting portion, and an eighth connecting portion. The fifth connecting portion is connected to the first impedance matching network portion, the sixth connecting portion is connected to the first antenna radiator, the seventh connecting portion is connected to both the second and third antenna radiators, and the seventh connecting portion is also connected to the second impedance matching network portion, thereby connecting the second impedance matching network portion to the second antenna radiator. The eighth connecting portion is connected to the second antenna radiator, and the sixth connecting portion is connected to the eighth connecting portion. By connecting the fifth and sixth connecting portions, the first impedance matching network portion is connected to the second antenna radiator.

[0012] Optionally, the second antenna radiator has two grooves, and the seventh connecting part and the eighth connecting part are nested in the grooves of the second antenna radiator.

[0013] Optionally, the first port group corresponds to the first antenna radiator and the second antenna radiator, and the second port group corresponds to the third antenna radiator and the second antenna radiator.

[0014] Optionally, the first impedance matching network and the second impedance matching network are made of metal strips, the size and position of which are adjustable; the first antenna radiator and the third antenna radiator are made of multiple bent metal strips and tail metal blocks, the second antenna radiator is a metal block, and the spacing between the metal blocks of the first antenna radiator and the third antenna radiator and the metal block of the second antenna radiator is adjustable.

[0015] Optionally, when the RFID tag is installed on a metal object, the second impedance matching network and the third antenna radiator in the RFID tag are suspended outside the metal layer of the metal object, and the second antenna radiator is coupled to the metal layer of the metal object.

[0016] Optionally, the first antenna body and the second antenna body are separate, and the volume of the first antenna body is smaller than that of the second antenna body. When connecting the antenna body to the radio frequency chip, the first antenna body is used to connect to the radio frequency chip.

[0017] Optionally, the first antenna body is disposed on the first dielectric layer, the second antenna body is disposed on the second dielectric layer, and the first antenna body is adhered to the reverse side of the second dielectric layer where the second antenna body is located; the radio frequency chip is located between the first dielectric layer and the second dielectric layer.

[0018] This application also discloses a product packaging that includes the aforementioned radio frequency tag.

[0019] Compared with the prior art, the embodiments of this application have the following advantages:

[0020] In this embodiment, the RFID tag includes an RFID chip and an antenna body. The RFID chip includes a first port group and a second port group. The antenna body includes a first antenna body and a second antenna body. The first antenna body includes a first impedance matching network. The second antenna body includes a second impedance matching network and an antenna radiator. The antenna radiator is connected to the first impedance matching network and the second impedance matching network, and the antenna radiator is disposed around the first impedance matching network and the second impedance matching network. The first port group is connected to the first impedance matching network, and the second port group is connected to the second impedance matching network. There is an overlapping area between the first impedance matching network and the second impedance matching network, which can reduce the overall size of the RFID tag. In addition, since the existence of the overlapping area will generate mutual inductance, the conjugate impedance matching between the antenna body and the RFID chip can be achieved with a smaller impedance matching network, further reducing the size of the RFID tag. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of an RFID tag according to an embodiment of this application;

[0022] Figure 2 This is a schematic diagram of the structure of a first antenna body according to an embodiment of this application;

[0023] Figure 3 This is a schematic diagram of the structure of a second antenna body according to an embodiment of this application;

[0024] Figure 4 This is a schematic diagram of the structural distribution of an RFID tag according to an embodiment of this application;

[0025] Figure 5 This is a schematic diagram of an RFID tag installed on a metal article according to an embodiment of this application;

[0026] Figure 6 This is a schematic diagram of the structure of an RFID tag system according to an embodiment of this application.

[0027] Figure label:

[0028] 1. Radio frequency chip; 2. First antenna body; 21. First impedance matching network; 22. Fifth connection part; 23. First connection part; 24. Second connection part; 3. First dielectric layer; 4. Adhesive; 5. Second antenna body; 51. Second impedance matching network part; 52. First antenna radiator; 53. Second antenna radiator; 54. Third antenna radiator; 55. Seventh connection part; 56. Eighth connection part; 57. Metal strip; 511. Third connection part; 512. Fourth connection part; 521. Sixth connection part; 6. Second dielectric layer; 7. Metal layer on the surface of a metal object. Detailed Implementation

[0029] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] Radio frequency tags include ultra-high frequency (UHF) RFID tags, which can be further divided into linearly polarized RFID tags and omnidirectional RFID tags. Linearly polarized RFID tags suffer from severe performance degradation in the non-polarized direction, placing more demands on RFID systems compared to omnidirectional RFID tags.

[0031] Common UHF omnidirectional RFID tags typically employ two implementation methods. One method achieves omnidirectional design by adjusting the shape of the dipole antenna or by applying capacitors to the ends of the two dipoles. The disadvantage of this method is that the performance deviation in different directions is relatively large, resulting in omnidirectional performance deviation. The other method uses a dual-port RF chip combined with two sets of dipole antennas with polarization directions 90° apart to achieve omnidirectional design, using a cross-parallel inductive impedance matching network for impedance matching design. The disadvantage of this method is that the antenna size is relatively large.

[0032] In view of this, this application proposes a novel radio frequency tag based on a dual-port radio frequency chip to avoid the drawbacks of the above-mentioned implementation methods.

[0033] Reference Figure 1 This is a schematic diagram of the structure of an embodiment of an RFID tag according to this application. Specifically, the RFID tag may include: an RFID chip 1 and an antenna body, wherein the RFID chip includes a first port group and a second port group.

[0034] The antenna body includes a first antenna body 2 and a second antenna body 5. The first antenna body 2 includes a first impedance matching network section 21. The second antenna body includes a second impedance matching network section 51 and an antenna radiator section. The antenna radiator section includes multiple radiators. The antenna radiator section is connected to the first impedance matching network section 21 and the second impedance matching network section 51. The antenna radiator section is disposed around the first impedance matching network section and the second impedance matching network section.

[0035] The antenna body in an RFID tag is the input terminal for radio frequency (RF) signals, and the location of the RF chip 1 on the antenna body is the load terminal. Impedance matching refers to a suitable pairing between the antenna body and the RF chip 1. If there is an impedance mismatch between the antenna body and the RF chip 1, a reflected wave will be generated at the load terminal, forming a standing wave on the antenna body, preventing energy transfer and reducing the efficiency of the RFID tag. Therefore, an impedance matching network needs to be included in the RFID tag to ensure its efficiency.

[0036] The first port group of the RF chip 1 is connected to the first impedance matching network section 21, and the second port group of the RF chip 1 is connected to the second impedance matching network section 51. There is an overlapping area between the first impedance matching network section 21 and the second impedance matching network section 51, thus reducing the overall size of the RF tag. Furthermore, the impedance matching network of a typical dual-port RF tag consists of two inductive impedance matching networks connected in parallel, each connected to one port. Since the inductance of the impedance matching network decreases after parallel connection, a larger physical size is required to achieve conjugate impedance matching between the antenna body and the capacitive RF chip, thereby achieving better performance. When the parallel equivalent capacitance of the RF chip is small, the size of the impedance matching network needs to be further increased. In this embodiment, the first impedance matching network section 21 and the second impedance matching network section 51 corresponding to the two port groups of the RF chip 1 are not connected in parallel. Simultaneously, the existence of the overlapping area generates mutual inductance. Therefore, conjugate impedance matching between the antenna body and the RF chip 1 can be achieved with a smaller impedance matching network section, further reducing the size of the RF tag.

[0037] In this embodiment of the invention, the RF chip 1 is a dual-port RF chip. The ports in the first and second port groups of the RF chip 1 are diagonally intersecting. The first port group is connected to the first antenna body, and the second port group is connected to the second antenna body. The first and second port groups can operate independently by connecting to the antenna body. When both port groups operate simultaneously, it is called the dual-port operating mode. In this mode, the radiating element experiences superposition of current components generated by the two port groups in both the horizontal and vertical directions, and the resonant frequencies generated by the first and second port groups are superimposed on the radiating element, thereby further increasing the bandwidth of the RF tag and improving its identification distance. It should be noted that the first and second port groups of the RF chip 1, connected to the antenna body, not only operate independently but also have a phase difference of up to 90°.

[0038] Reference Figure 2 This is a schematic diagram of the structure of a first antenna body according to an embodiment of this application. The first antenna body is composed of a first impedance matching network section 21, a fifth connection section 22, a first connection section 23, and a second connection section 24. The first impedance matching network section 21 of the first antenna body is composed of four metal strips. The first impedance matching network section 21 is an inductive impedance matching network section. The fifth connection section 22 can be a metal block. The first connection section 23 and the second connection section 24 can be L-shaped metal strips.

[0039] Reference Figure 3 This is a schematic diagram of the structure of a second antenna body according to an embodiment of this application. The second antenna body consists of an antenna radiator section, a second impedance matching network section 51, a third connecting section 511, a fourth connecting section 512, a sixth connecting section 521, a seventh connecting section 55, and an eighth connecting section 56. The antenna radiator section includes a first antenna radiator 52, a second antenna radiator 53, and a third antenna radiator 54. The first antenna radiator 52 and the third antenna radiator 54 are composed of multiple bent metal strips and a tail metal block, while the second antenna radiator 53 is a metal block. The second impedance matching network section 51 of the second antenna body is composed of C-shaped metal strips. The third connecting section 511, the fourth connecting section 512, and the sixth connecting section 521 are metal blocks (rectangular metal blocks). The seventh connecting section 55 and the eighth connecting section 56 can be metal strips. Specifically, the seventh connecting section 55 and the eighth connecting section 56 can be L-shaped metal strips, but they can also be T-shaped, multi-segment bent, I-shaped, or other shapes of metal strips.

[0040] Specifically, refer to Figure 1The radio frequency chip 1 is connected to the first antenna body via anisotropic conductive adhesive (not shown in the figure). The diagonally crossed ports in the first port group are connected to the first impedance matching network 21. The diagonally crossed ports in the second port group are connected to the first connection part 23 and the second connection part 24 respectively. The second impedance matching network 51 is connected to the third connection part 511 and the fourth connection part 512. By connecting the first connection part 23 and the second connection part 24 with the third connection part 511 and the fourth connection part 512, the second port group of the radio frequency chip 1 is connected to the second impedance matching network 51.

[0041] Specifically, the fifth connection part 22 is connected to the first impedance matching network part 21, the sixth connection part 521 is connected to the first antenna radiator 52, the seventh connection part 55 is connected to the second antenna radiator 53 and the third antenna radiator 54, and the seventh connection part 55 is connected to the second impedance matching network part 51, so that the second impedance matching network part 51 is connected to the second antenna radiator 53, the eighth connection part 56 is connected to the second antenna radiator 53, and the sixth connection part 521 is connected to the eighth connection part 56. By connecting the fifth connection part 22 and the sixth connection part 521, the first impedance matching network part 21 is connected to the second antenna radiator 53.

[0042] As an example, the second antenna radiator 53 can be a metal block with two L-shaped slots, and the seventh connecting part 55 and the eighth connecting part 56 can be L-shaped metal strips adapted to the L-shaped slots of the second antenna radiator 53. The L-shaped metal strips of the seventh connecting part 55 and the eighth connecting part 56 can be nested in the grooves of the second antenna radiator 53.

[0043] In this embodiment, the fifth connection portion 22 on the first antenna body 2 and the sixth connection portion 521 on the second antenna body 5 are capacitively coupled to connect the inductive first impedance matching network portion 21 to the first antenna radiator 52 and the L-shaped eighth connection portion 56. The L-shaped eighth connection portion 56 is capacitively coupled to the second antenna radiator 53. The L-shaped first connection portion 23 and the second connection portion 24 on the first antenna body 2 are capacitively coupled to the rectangular third connection portion 511 and the fourth connection portion 512 on the second antenna body 5, and together with the C-shaped metal strip 57, form the second inductive impedance matching network portion 51. The second inductive impedance matching network portion 51 is connected to the third antenna radiator 54 and the L-shaped seventh connection portion 55. The L-shaped seventh connection portion 55 is capacitively coupled to the second antenna radiator 53 through an L-shaped slot.

[0044] In this embodiment, the first port group of the RF chip 1 corresponds to the first antenna radiator 52 and the second antenna radiator 53, and the second port group corresponds to the third antenna radiator 54 and the second antenna radiator 53. Specifically, the two port groups of the RF chip 1 correspond to the first antenna radiator 52 and the third antenna radiator 54, respectively, and are coupled to the second antenna radiator 53 through the L-shaped seventh connection portion 55 and the eighth connection portion 56, respectively. Since the two port groups of the RF chip 1, namely the first port group and the second port group, share the second antenna radiator 53 as the other half of the half-wave dipole, the physical size required for the antenna body in the RF tag is reduced, thereby achieving the goal of miniaturizing the RF tag design.

[0045] In practical implementation, the omnidirectional performance of an RFID tag refers to its ability to be identified within the entire 360° spatial range, such as its ability to be recognized by a reader / writer. If the RFID tag can be identified throughout the entire spatial range, and the read / write distance remains within a consistent range at each location, then the RFID tag has good omnidirectional performance. Conversely, if the RFID tag has locations where it cannot be identified, or if the read / write distance at each location varies significantly, then the RFID tag has poor omnidirectional performance. In this embodiment, since the first antenna radiator 52 and the third antenna radiator 54 are at a 90° angle, the RFID tag's radiation pattern can achieve good omnidirectionality by superimposing the ports of the RFID chips with a 90° phase difference.

[0046] In one alternative example of this application, refer to Figure 1In addition to adjusting the size and position of the metal strips that make up the first impedance matching network 21 and the second impedance matching network 51, the input impedance of the RFID tag at the RF chip feed point can also be adjusted by adjusting the spacing 'a' between the rectangular metal block at the end of the first antenna radiator 52 and the second antenna radiator 53, and by adjusting the spacing 'b' between the rectangular metal block at the end of the third antenna radiator 54 and the second antenna radiator 53. Furthermore, in this embodiment, the volume of the first antenna body 2 is smaller than that of the second antenna body 5. Since the first antenna body 2 and the second antenna body 5 are designed separately—specifically, the impedance matching network and the radiator are separate—only the smaller first antenna body 2 needs to be used for bonding with the RF chip 1 during flip-chip packaging, thus significantly improving the chip bonding efficiency of the RFID tag. Simultaneously, different application scenarios can be adapted simply by adjusting the design of the second antenna body 5, thereby effectively shortening the processing cycle and reducing inventory pressure. It should be noted that the RFID tag in this application adopts a separate design. Specifically, the impedance matching network part and the radiator part adopt a separate design, which is one of the core concepts of this application. In practical applications, the size of a certain impedance matching network part can be fixed, which can meet the need to reduce the production and processing cycle of the impedance matching network part, and realize that the same impedance matching network part can be used for radiator parts of different sizes, thereby reducing the inventory pressure of impedance matching network parts and helping to reduce the manufacturing cost of RFID tags.

[0047] Reference Figure 4 This is a schematic diagram of the structural distribution of an RFID tag according to an embodiment of this application. A first antenna body 2 is disposed on a first dielectric layer 3, and a second antenna body 5 is disposed on a second dielectric layer 6. The materials of the first dielectric layer 3 and the second dielectric layer 6 are PET film, but other plastic materials or paper materials with low dielectric loss tangents can also be used; this embodiment of the invention does not impose any limitations on this. The first antenna body 2 and the second antenna body 5 are etched or printed with materials with good conductivity, such as copper or aluminum. The first impedance matching network 21 and the second impedance matching network 51 are composed of metal strips, which are equivalent to inductors made of copper, aluminum, or other materials. The first antenna body 2 is adhered to the reverse side of the second dielectric layer 6 where the second antenna body 5 is located using adhesive 4. Furthermore, the RFID chip 1 can be positioned between the first dielectric layer 3 and the second dielectric layer 6 to protect the RFID chip 1. It can be understood that the RFID chip 1 is protected by the dielectric layers and is therefore less prone to detachment by external forces, effectively improving the overall reliability of the RFID tag.

[0048] When conventional UHF RFID tags are installed on metal objects, the electromagnetic wave energy of the RFID tag is absorbed and lost during radiation due to the influence of the metal layer in the metal object. This results in an impedance mismatch between the antenna body and the RF chip 1, leading to very poor RF performance. However, when the RFID tag of the present application is installed on a metal object, the problems existing with conventional UHF RFID tags do not occur. Specifically, refer to... Figure 5 This is a schematic diagram of an RFID tag installed on a metal object according to an embodiment of this application. When the RFID tag of this embodiment is installed on the surface of a metal object (such as metal packaging, metal shell, canned beverage, etc.), the second impedance matching network 51 and the third antenna radiator 54 are suspended above the metal layer 7 on the surface of the metal object. The L-shaped metal strip is coupled with the second antenna radiator 53 and the metal layer of the surface 7 of the metal object. At this time, the RFID tag can be regarded as a monopole antenna with an impedance matching network, and the metal object is equivalent to the GND (grounding point) of the monopole antenna. A mirror current is formed on the surface of the metal object, which greatly improves the gain of the RFID tag. Thus, when the RFID tag is installed on the surface of the metal object with most of its area directly overlapping the metal layer of the surface of the metal object, it can still achieve excellent radio frequency performance.

[0049] In summary, the main technical advantages of the embodiments of this application are as follows: 1. It has a small antenna size while having good omnidirectionality; 2. It has good radio frequency performance when applied to metal objects; 3. The split design can effectively shorten the processing cycle of RFID tags and reduce the inventory pressure of RFID tag components, such as impedance matching network parts.

[0050] Based on the aforementioned radio frequency tags, this application provides a radio frequency tag system (RFID system). Specifically, refer to... Figure 6 This is a schematic diagram of the structure of an RFID tag system according to an embodiment of this application. The RFID tag system includes an RFID tag 601 according to the embodiment of this application, as well as a reader / writer device 602 and a server 603. The reader / writer device 602 is used to obtain RFID tag information from the RFID tag 601 and send the RFID tag information to the server 603. The server 603 is used to process the tag information when receiving the RFID tag information sent by the reader / writer device.

[0051] In one example of this application, the RFID tag 601 includes an RFID chip and an antenna body; the RFID chip includes a first port group and a second port group; the antenna body includes a first antenna body and a second antenna body, the first antenna body includes a first impedance matching network portion, the second antenna body includes a second impedance matching network portion and an antenna radiator portion, the antenna radiator portion is connected to the first impedance matching network portion and the second impedance matching network portion, and the antenna radiator portion is disposed around the first impedance matching network portion and the second impedance matching network portion; the first port group is connected to the first impedance matching network portion, the second port group is connected to the second impedance matching network portion, wherein there is an overlapping area between the first impedance matching network portion and the second impedance matching network portion.

[0052] In one example of this application, the radio frequency chip is a dual-port radio frequency chip, and the ports in the first port group and the second port group are a set of diagonally intersecting ports. The first port group and the second port group are connected to the antenna body and operate independently with a phase difference of 90°.

[0053] In one example of this application, the diagonally crossed ports in the first port group are connected to the first impedance matching network; the first antenna body includes a first connection portion and a second connection portion, the second antenna body includes a third connection portion and a fourth connection portion, the diagonally crossed ports in the second port group are connected to the first connection portion and the second connection portion, and the second impedance matching network is connected to the third connection portion and the fourth connection portion. By connecting the first connection portion and the second connection portion to the third connection portion and the fourth connection portion, the second port group is connected to the second impedance matching network.

[0054] In one example of this application, the antenna radiator includes a first antenna radiator, a second antenna radiator, and a third antenna radiator. The first antenna body further includes a fifth connecting portion, and the second antenna body further includes a sixth connecting portion, a seventh connecting portion, and an eighth connecting portion. The fifth connecting portion is connected to the first impedance matching network portion, the sixth connecting portion is connected to the first antenna radiator, the seventh connecting portion is connected to both the second and third antenna radiators, and the seventh connecting portion is also connected to the second impedance matching network portion, thereby connecting the second impedance matching network portion to the second antenna radiator. The eighth connecting portion is connected to the second antenna radiator, and the sixth connecting portion is connected to the eighth connecting portion. By connecting the fifth and sixth connecting portions, the first impedance matching network portion is connected to the second antenna radiator.

[0055] In one example of this application, the second antenna radiator has two grooves, and the seventh connecting part and the eighth connecting part are nested in the grooves of the second antenna radiator.

[0056] In one example of this application, the first port group corresponds to the first antenna radiator and the second antenna radiator, and the second port group corresponds to the third antenna radiator and the second antenna radiator.

[0057] In one example of this application, the first impedance matching network and the second impedance matching network are composed of metal strips, the size and position of which are adjustable; the first antenna radiator and the third antenna radiator are composed of multiple bent metal strips and tail metal blocks, the second antenna radiator is a metal block, and the spacing between the metal blocks of the first antenna radiator and the third antenna radiator and the metal block of the second antenna radiator is adjustable.

[0058] In one example of this application, when the RFID tag is mounted on a metal article, the second impedance matching network portion and the third antenna radiator in the RFID tag are suspended outside the metal layer of the metal article, and the second antenna radiator is coupled to the metal layer of the metal article.

[0059] In one example of this application, the first antenna body and the second antenna body are separated, and the volume of the first antenna body is smaller than that of the second antenna body. When connecting the antenna body to the radio frequency chip, the first antenna body is used to connect to the radio frequency chip.

[0060] In one example of this application, the first antenna body is disposed on the first dielectric layer, the second antenna body is disposed on the second dielectric layer, and the first antenna body is adhered to the reverse side of the second dielectric layer where the second antenna body is located; the radio frequency chip is located between the first dielectric layer and the second dielectric layer.

[0061] In a specific implementation, when the RFID tag 601 of this embodiment is in an electromagnetic field environment, the RFID chip in the RFID tag 601 will be powered by the electromagnetic field environment. At this time, the RFID chip can transmit RFID signals, and the antenna body will transmit the RFID signals to the reading and writing device, so that the reading and writing device can parse and obtain the RFID tag information. Of course, the RFID tag 601 of this embodiment also has the function of receiving RFID signals, specifically, it can receive information sent by the reading and writing device through the antenna body.

[0062] As for the RFID tag system embodiment, since its description is basically similar to that of the RFID tag embodiment, the description is relatively simple. For relevant details, please refer to the description of the RFID tag embodiment. It will not be repeated here.

[0063] This application also provides a product packaging that includes the aforementioned RFID tag. Specifically, the product packaging refers to the general term for the decorations attached to a product using containers, materials, and auxiliary materials according to certain technical methods during the product transportation, storage, and sales processes, in order to protect the product, facilitate storage, and promote sales. In this application embodiment, the RFID tag can be attached to the product packaging using methods such as pasting, embedding, or hooking, enabling the tracking and location of the product containing the packaging. Furthermore, since the RFID tag in this application embodiment is small in size, it does not increase the cost during the product transportation, storage, and sales processes.

[0064] Other embodiments of this specification will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This specification is intended to cover any variations, uses, or adaptations that follow the general principles of this specification and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this specification are indicated by the following claims.

[0065] It should also be noted that 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 limitation, 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.

[0066] The above description is merely a preferred embodiment of this specification and is not intended to limit this specification. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this specification should be included within the scope of protection of this specification.

[0067] The above provides a detailed description of an RFID tag provided in this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A radio frequency tag, characterized by The radio frequency tag includes: RF chip and antenna body; The radio frequency chip includes a first port group and a second port group; The antenna body includes a first antenna body and a second antenna body. The first antenna body includes a first impedance matching network section, and the second antenna body includes a second impedance matching network section and an antenna radiator section. The antenna radiator section is connected to the first impedance matching network section and the second impedance matching network section, and the antenna radiator section is disposed around the first impedance matching network section and the second impedance matching network section. The first port group is connected to the first impedance matching network section, and the second port group is connected to the second impedance matching network section, wherein there is an overlapping area between the first impedance matching network section and the second impedance matching network section; The first antenna body and the second antenna body are separate, and the volume of the first antenna body is smaller than that of the second antenna body. When connecting the antenna body to the radio frequency chip, the first antenna body is used to connect to the radio frequency chip.

2. The radio frequency tag of claim 1, wherein, The radio frequency chip is a dual-port radio frequency chip. The ports in the first port group and the second port group are a set of diagonally intersecting ports. The first port group and the second port group are connected to the antenna body and work independently with a phase difference of 90°.

3. The radio frequency tag of claim 2, wherein, The diagonally crossed ports in the first port group are connected to the first impedance matching network section; the first antenna body includes a first connecting part and a second connecting part, the second antenna body includes a third connecting part and a fourth connecting part, the diagonally crossed ports in the second port group are connected to the first connecting part and the second connecting part, and the second impedance matching network section is connected to the third connecting part and the fourth connecting part. By connecting the first connecting part and the second connecting part to the third connecting part and the fourth connecting part, the second port group is connected to the second impedance matching network section.

4. The radio frequency tag of claim 3, wherein, The antenna radiator includes a first antenna radiator, a second antenna radiator, and a third antenna radiator. The first antenna body also includes a fifth connecting part, and the second antenna body also includes a sixth connecting part, a seventh connecting part, and an eighth connecting part. The fifth connecting part is connected to the first impedance matching network part, the sixth connecting part is connected to the first antenna radiator, the seventh connecting part is connected to the second antenna radiator and the third antenna radiator, and the seventh connecting part is also connected to the second impedance matching network part, so that the second impedance matching network part is connected to the second antenna radiator. The eighth connecting part is connected to the second antenna radiator, and the sixth connecting part is connected to the eighth connecting part. By connecting the fifth connecting part and the sixth connecting part, the first impedance matching network part is connected to the second antenna radiator.

5. The radio frequency tag of claim 4, wherein, The second antenna radiator has two grooves, and the seventh connecting part and the eighth connecting part are nested in the grooves of the second antenna radiator.

6. The radio frequency tag of claim 4, wherein, The first port group corresponds to the first antenna radiator and the second antenna radiator, and the second port group corresponds to the third antenna radiator and the second antenna radiator.

7. The radio frequency tag of claim 4, wherein, The first impedance matching network and the second impedance matching network are made of metal strips, the size and position of which are adjustable; the first antenna radiator and the third antenna radiator are made of multiple bent metal strips and tail metal blocks, the second antenna radiator is a metal block, and the spacing between the metal blocks of the first antenna radiator and the third antenna radiator and the metal block of the second antenna radiator is adjustable.

8. The radio frequency tag of claim 4, wherein, When the RFID tag is installed on a metal object, the second impedance matching network and the third antenna radiator in the RFID tag are suspended outside the metal layer of the metal object, and the second antenna radiator is coupled to the metal layer of the metal object.

9. The radio frequency tag of claim 1, wherein, The first antenna body is disposed on the first dielectric layer, the second antenna body is disposed on the second dielectric layer, and the first antenna body is adhered to the reverse side of the second dielectric layer where the second antenna body is located; the radio frequency chip is located between the first dielectric layer and the second dielectric layer.

10. A product package characterized in that, The product packaging includes the radio frequency tag as described in any one of claims 1 to 9.

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