CN117559112A - Radio frequency tag - Google Patents

Abstract

The embodiment of the application provides a radio frequency tag, which comprises a radio frequency chip and an antenna body; the radio frequency chip comprises a first port group and a second port group; the antenna body comprises a first antenna body and a second antenna body, the first antenna body comprises a first impedance matching network part, the second antenna body comprises a second impedance matching network part and an antenna radiator part, the antenna radiator part is connected with the first impedance matching network part and the second impedance matching network part, and the antenna radiator part is arranged around the first impedance matching network part and the second impedance matching network part; the first port group is connected with the first impedance matching network part, and the second port group is connected with the second impedance matching network part, wherein an overlapping area exists between the first impedance matching network part and the second impedance matching network part. The radio frequency tag can reduce the volume of the radio frequency tag.

Description

Radio frequency tag

Technical Field

The present application relates to the field of radio frequency identification technologies, and in particular, to a radio frequency tag.

Background

Radio frequency identification (RFID, radio Frequency Identification) technology is a communication technology that can identify a specific object by radio signals and read and write related data without the need for establishing mechanical or optical contact between the identification system and the specific object. Among them, the RFID tag (radio frequency tag) as an important component of the RFID system greatly affects the performance of the entire RFID system. Among them, the main factors affecting the performance of the radio frequency tag include the antenna size, so that the current radio frequency tag has a problem of oversized size in order to ensure the performance of the RFID system.

Disclosure of Invention

The embodiment of the application provides a radio frequency tag to solve the problem that the size of the radio frequency tag is too large.

In order to solve the above problems, an embodiment of the present application discloses a radio frequency tag method, where the radio frequency tag includes:

a radio frequency chip and an antenna body;

the radio frequency chip comprises a first port group and a second port group;

the antenna body comprises a first antenna body and a second antenna body, the first antenna body comprises a first impedance matching network part, the second antenna body comprises a second impedance matching network part and an antenna radiator part, the antenna radiator part is connected with the first impedance matching network part and the second impedance matching network part, and the antenna radiator part is arranged around the first impedance matching network part and the second impedance matching network part;

the first port group is connected with the first impedance matching network part, and the second port group is connected with the second impedance matching network part, wherein an overlapping area exists between the first impedance matching network part and the second impedance matching network part.

Optionally, 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 group of diagonally crossed ports, and the first port group and the second port group are connected with the antenna body to work independently and have a phase difference of 90 °.

Optionally, diagonally crossing ports in the first port set are connected with the first impedance matching network section; the first antenna body comprises a first connecting part and a second connecting part, the second antenna body comprises a third connecting part and a fourth connecting part, diagonally crossed ports in the second port group are connected with the first connecting part and the second connecting part, the second impedance matching network part is connected with the third connecting part and the fourth connecting part, and the second port group is connected with the second impedance matching network part by connecting the first connecting part and the second connecting part with the third connecting part and the fourth connecting part.

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 connection portion, the second antenna body further includes a sixth connection portion, a seventh connection portion and an eighth connection portion, the fifth connection portion is connected with the first impedance matching network portion, the sixth connection portion is connected with the first antenna radiator, the seventh connection portion is connected with the second antenna radiator and the third antenna radiator, and the seventh connection portion is connected with the second impedance matching network portion, so that the second impedance matching network portion is connected with the second antenna radiator, the eighth connection portion is connected with the second antenna radiator, the sixth connection portion is connected with the eighth connection portion, and the fifth connection portion is connected with the sixth connection portion, so that the first impedance matching network portion is connected with the second antenna radiator.

Optionally, the second antenna radiator is provided with two grooves, and the seventh connecting portion and the eighth connecting portion are nested in the grooves of the second antenna radiator.

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.

Optionally, the first impedance matching network part and the second impedance matching network part are formed by metal strips, and the sizes and positions of the metal strips are adjustable; the first antenna radiator and the third antenna radiator are formed by multi-section bending metal strips and tail metal blocks, the second antenna radiator is a metal block, and the distance 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.

Optionally, when the radio frequency tag is mounted on a metal article, the second impedance matching network part and the third antenna radiator in the radio frequency tag are suspended outside the metal layer of the metal article, and the second antenna radiator is coupled with the metal layer of the metal article.

Optionally, the first antenna body is separated from the second antenna body, and the volume of the first antenna body is smaller than that of the second antenna body, and when the antenna body is connected with the radio frequency chip, the first antenna body is connected with the radio frequency chip.

Optionally, the first antenna body is arranged on the first dielectric layer, the second antenna body is arranged 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 positioned between the first dielectric layer and the second dielectric layer.

The embodiment of the application also discloses a product package, which comprises the radio frequency tag.

Compared with the prior art, the embodiment of the application has the following advantages:

in this embodiment of the application, the radio frequency tag includes radio frequency chip and antenna body, wherein, the radio frequency chip includes first port group and second port group, the antenna body includes first antenna body and second antenna body, first antenna body includes first impedance matching network portion, the second antenna body includes second impedance matching network portion and antenna radiator portion, antenna radiator portion is connected with first impedance matching network portion and second impedance matching network portion, and antenna radiator portion sets up around first impedance matching network portion and second impedance matching network portion, first port group is connected with first impedance matching network portion, second port group is connected with second impedance matching network portion, wherein, there is the overlap region between first impedance matching network portion and the second impedance matching network portion, consequently, can reduce the holistic volume of radio frequency tag, in addition, because the existence of overlap region can produce mutual inductance, can realize the antenna body with the conjugate impedance matching of radio frequency chip with the impedance matching network portion of less size, further reduced the volume of radio frequency tag.

Drawings

Fig. 1 is a schematic structural diagram of a radio frequency tag according to an embodiment of the present application;

fig. 2 is a schematic structural diagram of a first antenna body according to an embodiment of the present application;

fig. 3 is a schematic structural diagram of a second antenna body according to an embodiment of the present application;

fig. 4 is a schematic structural distribution diagram of a radio frequency tag according to an embodiment of the present application;

FIG. 5 is a schematic view of a radio frequency tag according to an embodiment of the present application mounted on a metal object;

fig. 6 is a schematic structural diagram of a radio frequency tag system according to an embodiment of the present application.

Reference numerals:

1. a radio frequency chip; 2. a first antenna body; 21. a first impedance matching network section; 22. a fifth connecting portion; 23. a first connection portion; 24. a second connecting portion; 3. a first dielectric layer; 4. an adhesive; 5. a second antenna body; 51. a second impedance matching network section; 52. a first antenna radiator; 53. a second antenna radiator; 54. a third antenna radiator; 55. a seventh connecting portion; 56. an eighth connecting portion; 57. a metal strip; 511. third connecting portion 512, fourth connecting portion 521, sixth connecting portion; 6. a second dielectric layer; 7. a metal layer on the surface of the metal object.

Detailed Description

In order that the above-recited objects, features and advantages of the present application will become more readily apparent, a more particular description of the invention briefly described above will be rendered by reference to specific embodiments that are illustrated in the appended drawings.

The radio frequency tag comprises an ultrahigh frequency radio frequency tag, the ultrahigh frequency radio frequency tag can be divided into a linear polarization radio frequency tag and an omnidirectional radio frequency tag, the linear polarization radio frequency tag has serious performance attenuation in a non-polarization direction, and compared with the omnidirectional radio frequency tag, the linear polarization radio frequency tag can provide more requirements for an RFID system.

The common ultra-high frequency omni-directional radio frequency tag generally uses two implementation modes, one is to realize omni-directional design by adjusting the shape of a vibrator or carrying out capacitive loading on the tail ends of two vibrators on the basis of a dipole antenna, and the disadvantage is that the performance deviation is larger in different directions and the omni-directional performance deviation is larger; the other is to use a dual-port radio frequency chip to combine two sets of dipole antennas with polarization directions different by 90 degrees to realize the omni-directional design, and to use a cross parallel inductive reactance matching network to perform the impedance matching design, which has the disadvantage of larger antenna size.

In view of this, the embodiments of the present application propose a novel radio frequency tag based on a dual-port radio frequency chip, so as to avoid the drawbacks of the above implementation manner.

Referring to fig. 1, a schematic structural diagram of an embodiment of a radio frequency tag of the present application, specifically, the radio frequency tag may include: the antenna comprises a radio frequency chip 1 and an antenna body, wherein the radio frequency chip comprises a first port group and a second port group.

The antenna body includes first antenna body 2 and second antenna body 5, and first antenna body 2 includes first impedance matching network portion 21, and the second antenna body includes second impedance matching network portion 51 and antenna radiator portion, and wherein, antenna radiator portion includes a plurality of radiators, and antenna radiator portion is connected with first impedance matching network portion 21 and second impedance matching network portion 51, and antenna radiator portion sets up around first impedance matching network portion and second impedance matching network portion.

The antenna body in the radio frequency tag is an input end of radio frequency signals, the position of the antenna body, where the radio frequency chip 1 is arranged, is a load end, and impedance matching refers to a proper matching mode between the antenna body and the radio frequency chip 1. If the impedance between the antenna body and the radio frequency chip 1 is not matched, the load end will generate reflected waves, and standing waves are formed on the antenna body, so that energy cannot be transmitted, and the efficiency of the radio frequency tag is reduced.

The first port group of the radio frequency chip 1 is connected with the first impedance matching network part 21, the second port group of the radio frequency chip 1 is connected with the second impedance matching network part 51, wherein an overlapping area exists between the first impedance matching network part 21 and the second impedance matching network part 51, so that the whole volume of the radio frequency tag can be reduced. In the embodiment of the application, the first impedance matching network part 21 and the second impedance matching network part 51 corresponding to the two port groups of the radio frequency chip 1 are not connected in parallel, and meanwhile, mutual inductance can be generated due to the existence of an overlapping area, so that the conjugate impedance matching of the antenna body and the radio frequency chip 1 can be realized through the impedance matching network part with a smaller size, and the volume of the radio frequency tag is further reduced.

In the embodiment of the invention, the radio frequency chip 1 is a dual-port radio frequency chip, ports in the first port group and the second port group of the radio frequency chip 1 are all a group of diagonally crossed ports, the first port group is connected with the first antenna body, the second port group is connected with the second antenna body, wherein the first port group and the second port group can independently work through being connected with the antenna body, when the two port groups work simultaneously, the radio frequency chip is called a dual-port working mode, at the moment, the radiator part is overlapped with current components generated by the two port groups in the horizontal direction and the vertical direction, and resonance frequencies generated by the first port group and the second port group are overlapped on the radiator part, so that the bandwidth of the radio frequency tag is further increased, and the identified distance of the radio frequency tag is improved. It should be noted that, the first port group and the second port group of the rf chip 1 are connected to the antenna body to operate independently, and the phase difference may be 90 °.

Referring to fig. 2, a schematic structural diagram of a first antenna body according to an embodiment of the present application is shown, where the first antenna body is composed of a first impedance matching network portion 21, a fifth connection portion 22, a first connection portion 23 and a second connection portion 24, where the first impedance matching network portion 21 of the first antenna body is composed of 4 metal strips, the first impedance matching network portion 21 is an inductive impedance matching network portion, the fifth connection portion 22 may be a metal block, and the first connection portion 23 and the second connection portion 24 may be L-shaped metal strips.

Referring to fig. 3, a schematic structural diagram of a second antenna body according to an embodiment of the present application, where the second antenna body is composed of an antenna radiator portion, a second impedance matching network portion 51, a third connection portion 511, a fourth connection portion 512, a sixth connection portion 521, a seventh connection portion 55 and an eighth connection portion 56. The antenna radiator part comprises a first antenna radiator 52, a second antenna radiator 53 and a third antenna radiator 54, wherein the first antenna radiator 52 and the third antenna radiator 54 are formed by a plurality of sections of bent metal strips and tail metal blocks, and the second antenna radiator 53 is a metal block. The second impedance matching network 51 of the second antenna body is formed of a C-shaped metal strip, the third connecting portion 511, the fourth connecting portion 512 and the sixth connecting portion 521 are metal blocks (rectangular metal blocks), the seventh connecting portion 55 and the eighth connecting portion 56 may be metal strips, specifically, the seventh connecting portion 55 and the eighth connecting portion 56 may be L-shaped metal strips, or may be metal strips of other shapes such as T-shaped, multi-section bent, I-shaped, etc.

Specifically, referring to fig. 1, the radio frequency chip 1 is connected to the first antenna body by an anisotropic conductive adhesive (not shown), wherein diagonally crossed ports in the first port group are connected to the first impedance matching network portion 21, diagonally crossed ports in the second port group are connected to the first connection portion 23 and the second connection portion 24, respectively, the second impedance matching network portion 51 is connected to the third connection portion 511 and the fourth connection portion 512, and the second port group of the radio frequency chip 1 is connected to the second impedance matching network portion 51 by connecting the first connection portion 23 and the second connection portion 24 to the third connection portion 511 and the fourth connection portion 512.

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

As an example, the second antenna radiator 53 may be a metal block with two L-shaped grooves, and the seventh connection part 55 and the eighth connection part 56 may be L-shaped metal strips that fit into the L-shaped grooves of the second antenna radiator 53, and the L-shaped metal strips of the seventh connection part 55 and the eighth connection part 56 may be nested in the grooves of the second antenna radiator 53.

In the embodiment of the present application, the fifth connection portion 22 on the first antenna body 2 and the sixth connection portion 521 on the second antenna body 5 connect the inductive first impedance matching network portion 21 with the first antenna radiator 52 and the L-shaped eighth connection portion 56 by capacitive coupling, and the L-shaped eighth connection portion 56 is capacitively coupled with the second antenna radiator 53. The first and second connection portions 23 and 24 of the first antenna body 2 are capacitively coupled to the third and fourth connection portions 511 and 512 of the second antenna body 5, and form a second inductance type impedance matching network portion 51 with a metal strip 57 of the C type, the second inductance type impedance matching network portion 51 being connected to the third antenna radiator 54 and the seventh connection portion 55 of the L type, the seventh connection portion 55 of the L type being capacitively coupled to the second antenna radiator 53 through an L-shaped slot.

In the embodiment of the present application, the first port group of the radio frequency 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 radio frequency chip 1 correspond to the first antenna radiator 52 and the third antenna radiator 54 respectively, and are coupled with the second antenna radiator 53 through the seventh connection portion 55 and the eighth connection portion 56 of the L shape respectively, where the two port groups of the radio frequency chip 1, that is, the first port group and the first port group share the second antenna radiator 53 as the other half radiator of the half-wave oscillator, so that the physical size required by the antenna body in the radio frequency tag is reduced, and the purpose of designing the radio frequency tag in a miniaturized manner is achieved.

In a specific implementation, the omnidirectional performance of the radio frequency tag refers to the capability of the radio frequency tag that can be identified in a full space range (360 degrees of space range), for example, the capability of the radio frequency tag that can be identified by a read-write device, if the radio frequency tag can be identified in the full space range and the read-write distances at all positions are kept in a consistent range, the omnidirectional performance of the radio frequency tag is better; if the radio frequency tag is in the whole space range, positions which cannot be identified exist, or the read-write distances of the positions are kept in different ranges with large differences, the omni-directional performance of the radio frequency tag is poor. In the embodiment of the present application, since the first antenna radiator 52 and the third antenna radiator 54 are 90 °, after the ports of the radio frequency chip with the phase difference of 90 ° are overlapped, the good omni-directionality of the radio frequency tag radiation pattern can be achieved.

In an alternative example of the present application, referring to fig. 1, the radio frequency tag may adjust the input impedance of the antenna body at the radio frequency chip feeding point by adjusting the space 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 space b between the rectangular metal block at the end of the third antenna radiator 54 and the second antenna radiator 53, in addition to the sizes and positions of the metal strips constituting the first impedance matching network portion 21 and the second impedance matching network portion 51, respectively. Meanwhile, the volume of the first antenna body 2 is smaller than that of the second antenna body 5, and since a split design is adopted between the first antenna body 2 and the second antenna body 5, specifically, the impedance matching network part and the radiator part are of a split design, and when flip-chip (chip packaging) is carried out, only the first antenna body 2 with smaller size is required to be bonded with the radio frequency chip 1, so that the chip bonding efficiency of the radio frequency tag is greatly improved. Meanwhile, the design of the second antenna body 5 can be adjusted to adapt to different application scenes, so that the processing period is effectively shortened, and the stock pressure is effectively reduced. It should be noted that, the radio frequency tag in the embodiment of the present application adopts a split design, specifically, the impedance matching network portion and the radiator portion adopt a split design, which is one of the core concepts in the embodiment of the present application, and in practical application, the size of a certain impedance matching network portion may be fixed, so that the requirements of reducing the production and processing link periods of the impedance matching network portion may be met, and the radiator portions with different sizes use the same impedance matching network portion, so as to reduce the inventory pressure of the impedance matching network portion, which is beneficial to reducing the manufacturing cost of the radio frequency tag.

Referring to fig. 4, a schematic structural distribution diagram of a radio frequency tag according to an embodiment of the present application is shown, where 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 films, and of course, other plastic materials or papers with smaller dielectric loss tangent values may be used. The first antenna body 2 and the second antenna body 5 are etched or printed with a material having good conductivity, such as copper, aluminum, or the like, and the first impedance matching network portion 21 and the second impedance matching network portion 51 are formed of metal strips, which are equivalent to inductance coils made of copper, aluminum, or the like. 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 through the adhesive 4, and the radio frequency chip 1 can be arranged between the first dielectric layer 3 and the second dielectric layer 6 to protect the radio frequency chip 1, and it can be understood that the radio frequency chip 1 is protected by the dielectric layer and is not easy to fall off due to external force, so that the overall reliability of the radio frequency tag is effectively improved.

When the conventional ultrahigh frequency radio frequency tag is mounted on a metal object, the electromagnetic wave energy of the radio frequency tag is absorbed and lost by the metal object in the radiation process due to the influence of the metal layer in the metal object, the phenomenon of impedance mismatch between the antenna body and the radio frequency chip 1 is generated, the radio frequency performance is very poor, and the problem of the conventional ultrahigh frequency radio frequency tag cannot occur when the radio frequency tag of the embodiment of the application is mounted on the metal object. Specifically, referring to fig. 5, a schematic diagram of a radio frequency tag according to an embodiment of the present application is shown on a metal article, when the radio frequency tag according to an embodiment of the present application is mounted on a surface of a metal article (such as a metal package, a metal housing, and a canned beverage, etc.), the second impedance matching network portion 51 and the third antenna radiator 54 are suspended in the metal layer 7 on the surface of the metal article, the l-shaped metal strip is coupled with the second antenna radiator 53 and the metal layer on the surface 7 of the metal article, at this time, the radio frequency tag may be regarded as a monopole antenna with the impedance matching network portion, and the metal article corresponds to GND (ground point) of the monopole antenna and forms a mirror current on the surface of the metal article to greatly improve the gain of the radio frequency tag, so that when the radio frequency tag is mounted on the surface of the metal article in a manner that most of the area is directly overlapped with the metal layer on the surface of the metal article, excellent radio frequency performance may still be achieved.

In summary, the main technical advantages of the embodiments of the present application are as follows: 1. the antenna has small antenna size and good omnidirectionality; 2. the radio frequency performance is good when the metal material is applied to metal articles; 3. the split design can effectively shorten the processing period of the radio frequency tag and reduce the stock pressure of radio frequency tag components such as an impedance matching network part and the like.

On the basis of the radio frequency tag, the embodiment of the application provides a radio frequency tag system (RFID system). Specifically, referring to fig. 6, a schematic structural diagram of a radio frequency tag system according to an embodiment of the present application, where the radio frequency tag system includes a radio frequency tag 601 according to an embodiment of the present application, and further includes a read-write device 602 and a server 603, where: the read-write device 602 is configured to obtain radio frequency tag information from the radio frequency tag 601, and send the radio frequency tag information to the server 603; the server 603 is configured to process the tag information when receiving the radio frequency tag information sent by the read/write device.

In one example of the present application, the radio frequency tag 601 includes a radio frequency chip and an antenna body; the radio frequency chip comprises a first port group and a second port group; the antenna body comprises a first antenna body and a second antenna body, the first antenna body comprises a first impedance matching network part, the second antenna body comprises a second impedance matching network part and an antenna radiator part, the antenna radiator part is connected with the first impedance matching network part and the second impedance matching network part, and the antenna radiator part is arranged around the first impedance matching network part and the second impedance matching network part; the first port group is connected with the first impedance matching network part, and the second port group is connected with the second impedance matching network part, wherein an overlapping area exists between the first impedance matching network part and the second impedance matching network part.

In one example of the present application, 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 group of diagonally crossed ports, and the first port group and the second port group are connected to the antenna body to operate independently and have a phase difference of 90 °.

In one example of the present application, diagonally crossing ports in the first port set are connected with the first impedance matching network section; the first antenna body comprises a first connecting part and a second connecting part, the second antenna body comprises a third connecting part and a fourth connecting part, diagonally crossed ports in the second port group are connected with the first connecting part and the second connecting part, the second impedance matching network part is connected with the third connecting part and the fourth connecting part, and the second port group is connected with the second impedance matching network part by connecting the first connecting part and the second connecting part with the third connecting part and the fourth connecting part.

In one example of the present 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 connection portion, the second antenna body further includes a sixth connection portion, a seventh connection portion, and an eighth connection portion, the fifth connection portion is connected with the first impedance matching network portion, the sixth connection portion is connected with the first antenna radiator, the seventh connection portion is connected with the second antenna radiator and the third antenna radiator, and the seventh connection portion is connected with the second impedance matching network portion, so that the second impedance matching network portion is connected with the second antenna radiator, the eighth connection portion is connected with the second antenna radiator, the sixth connection portion is connected with the eighth connection portion, and the fifth connection portion is connected with the sixth connection portion by connection, so that the first impedance matching network portion is connected with the second antenna radiator.

In one example of the present application, the second antenna radiator has two grooves, and the seventh connection portion and the eighth connection portion are nested in the grooves of the second antenna radiator.

In one example of the present 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.

In one example of the present application, the first impedance matching network portion and the second impedance matching network portion are composed of metal strips, the size and position of which are adjustable; the first antenna radiator and the third antenna radiator are formed by multi-section bending metal strips and tail metal blocks, the second antenna radiator is a metal block, and the distance 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.

In one example of the present application, when the radio frequency tag is mounted on a metal article, the second impedance matching network portion and the third antenna radiator in the radio frequency tag are suspended outside the metal layer of the metal article, and the second antenna radiator is coupled with the metal layer of the metal article.

In an example of the present 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, and when the antenna body and the radio frequency chip are connected, the first antenna body and the radio frequency chip are connected.

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

In a specific implementation, when the radio frequency tag 601 in the embodiment of the present application is in an electromagnetic field environment, a radio frequency chip in the radio frequency tag 601 may obtain power supply from the electromagnetic field environment, and at this time, the radio frequency chip may send a radio frequency signal outwards, and the antenna body sends the radio frequency signal to the read-write device, so that the read-write device analyzes the radio frequency tag information from the radio frequency tag information. Of course, the radio frequency tag 601 in the embodiment of the present application also has a function of receiving radio frequency signals, and specifically may receive information sent by the read-write device through the antenna body.

For the embodiment of the radio frequency tag system, the description is relatively simple because it is basically similar to the description of the radio frequency tag in the embodiment of the radio frequency tag, and the relevant parts only need to be referred to the part of the description of the embodiment of the radio frequency tag, which is not repeated here.

The embodiment of the application also provides a product package, which comprises the radio frequency tag. Specifically, the product package refers to a general term for decoration attached to a product by adopting a container, a material, an auxiliary object and the like according to a certain technical method in order to protect the product, facilitate storage and promote sales in circulation processes such as product transportation, storage and sales, wherein the product package of the embodiment of the application can be provided with a radio frequency tag in a manner of being stuck, embedded, hooked and the like, so that the product containing the product package can be tracked and positioned.

Other embodiments of the present disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This specification is intended to cover any variations, uses, or adaptations of the specification following, in general, the principles of the specification and including such departures from the present disclosure as come within known or customary practice within the art to which the specification pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the specification being indicated by the following claims.

It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article or apparatus that comprises the element.

The foregoing description of the preferred embodiments is provided for the purpose of illustration only, and is not intended to limit the scope of the disclosure, since any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the disclosure are intended to be included within the scope of the disclosure.

The foregoing has described in detail a radio frequency tag provided herein, and specific examples have been provided herein to illustrate the principles and embodiments of the present application, the above examples being provided only to assist in understanding the methods of the present application and the core ideas thereof; meanwhile, as those skilled in the art will have modifications in the specific embodiments and application scope in accordance with the ideas of the present application, the present description should not be construed as limiting the present application in view of the above.

Claims (11)

1. A radio frequency tag, the radio frequency tag comprising:

a radio frequency chip and an antenna body;

the radio frequency chip comprises a first port group and a second port group;

the antenna body comprises a first antenna body and a second antenna body, the first antenna body comprises a first impedance matching network part, the second antenna body comprises a second impedance matching network part and an antenna radiator part, the antenna radiator part is connected with the first impedance matching network part and the second impedance matching network part, and the antenna radiator part is arranged around the first impedance matching network part and the second impedance matching network part;

the first port group is connected with the first impedance matching network part, and the second port group is connected with the second impedance matching network part, wherein an overlapping area exists between the first impedance matching network part and the second impedance matching network part.

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-crossed ports, and the first port group and the second port group are connected to the antenna body to operate independently and with a phase difference of 90 °.

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

4. The radio frequency tag according to claim 3, wherein 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 connection portion, the second antenna body further includes a sixth connection portion, a seventh connection portion, and an eighth connection portion, the fifth connection portion is connected to the first impedance matching network portion, the sixth connection portion is connected to the first antenna radiator, the seventh connection portion is connected to the second antenna radiator and the third antenna radiator, and the seventh connection portion is connected to the second impedance matching network portion, so that the second impedance matching network portion is connected to the second antenna radiator, the eighth connection portion is connected to the second antenna radiator, and the sixth connection portion is connected to the eighth connection portion, by connecting the fifth connection portion to the sixth connection portion, so that the first impedance matching network portion 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 connection and the eighth connection 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 portion and the second impedance matching network portion are comprised of metal strips, the metal strips being adjustable in size and position; the first antenna radiator and the third antenna radiator are formed by multi-section bending metal strips and tail metal blocks, the second antenna radiator is a metal block, and the distance 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 the second impedance matching network portion and the third antenna radiator in the radio frequency tag are suspended from the metal layer of the metal article when the radio frequency tag is mounted on the metal article, the second antenna radiator being coupled to the metal layer of the metal article.

9. The radio frequency tag of claim 1, wherein the first antenna body and the second antenna body are separated, the first antenna body is smaller than the second antenna body, and the first antenna body is connected to the radio frequency chip when the antenna body is connected to the radio frequency chip.

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

11. A product package comprising the radio frequency tag of any one of claims 1 to 10 thereon.