CN111931893B

CN111931893B - Radio frequency tag

Info

Publication number: CN111931893B
Application number: CN202010664647.XA
Authority: CN
Inventors: 任磊
Original assignee: Cainiao Smart Logistics Holding Ltd
Current assignee: Cainiao Smart Logistics Holding Ltd
Priority date: 2020-07-10
Filing date: 2020-07-10
Publication date: 2023-12-26
Anticipated expiration: 2040-07-10
Also published as: CN111931893A

Abstract

The embodiment of the application provides a radio frequency tag and a radio frequency tag management system, comprising: an antenna body and a radio frequency processing module; the antenna body comprises an impedance matching network part and a radiator part; the impedance matching network section includes: a first section, an overlapping portion, and a second section; the first branch part and the second branch part are respectively arranged at two adjacent sides of the overlapping part; the impedance matching network part is communicated with the first port group and the second port group of the radio frequency processing module, and the radiator part arranged along the periphery of the impedance matching network part is communicated with the impedance matching network part. In this application, first impedance match sub-portion and second impedance match sub-portion share an overlap portion, have reduced radio frequency tag's size, and first impedance match sub-portion and second impedance match sub-portion share a radiator portion, and radio frequency tag is at two port group simultaneous working, and radiator portion all produces two port superimposed current components in horizontal direction and vertical direction, has guaranteed radio frequency tag's omnidirectional demand.

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.

RFID tags, as an important component of an RFID system, can greatly impact the performance of the overall RFID system. The omnidirectional RFID tag is characterized in that the tag can be well identified by a reader-writer within the 360-degree range, and currently, the omnidirectional RFID tag commonly adopted comprises the following two types: 1. as shown in fig. 1, the RFID tag is designed omnidirectionally by bending the ends of two vibrators 1 to change the current flow direction of the vibrators and disposing an impedance matching network 2 between the two vibrators 1 on the basis of a dipole antenna, and adopts a single-port RFID chip. 2. The RFID tag shown in fig. 2 adopts a dual-port RFID chip, and combines two sets of dipole antennas 3 with polarization directions different by 90 degrees to realize an omni-directional design, wherein the tag uses a cross-parallel impedance matching network 2 to carry out an impedance matching design.

However, in the current scheme, the performance of the label of the scheme one is greatly deviated in different directions, so that the omnidirectionality of the label is poor, for example, the read-write performance of the label of the scheme one in the length direction is good, and the read-write performance of the label in the width direction is poor. In the tag of the second scheme, two sets of dipole antennas 3 with polarization directions different by 90 degrees are adopted, so that each dipole antenna 3 is independently arranged at a corner corresponding to the tag, and the size of the tag is oversized.

Disclosure of Invention

The embodiment of the application provides a radio frequency tag, which solves the problems of poor omnidirectionality and oversized size of the existing radio frequency tag, and achieves the aim of further reducing the size of the radio frequency tag on the basis of ensuring the omnidirectionality of the radio frequency tag.

To solve the above problems, an embodiment of the present application discloses a radio frequency tag, including:

an antenna body and a radio frequency processing module; the antenna body comprises an impedance matching network part and a radiator part;

the impedance matching network section includes: the radio frequency processing module comprises a first port group and a second port group;

the first subsection is connected with the first side of the overlapping part, and the second subsection is connected with the second side of the overlapping part; the first side is adjacent to the second side;

the first subsection and the overlapping part form a first impedance matching sub-part, the second subsection and the overlapping part form a second impedance matching sub-part, the first impedance matching sub-part is communicated with the first port group, and the second impedance matching sub-part is communicated with the second port group;

the radiator part is arranged along the periphery of the impedance matching network part, and the radiator part is communicated with the impedance matching network part.

The embodiment of the application discloses a radio frequency tag, including:

the radio frequency processing module comprises: a first port group and a second port group;

the impedance matching network section includes: a transmission line frame, four conductive transmission lines connected to the transmission line frame;

one end of each of the two conductive transmission lines is arranged on two opposite sides of the transmission line frame body, one end of each of the other two conductive transmission lines is arranged on the other two opposite sides of the transmission line frame body, and the conductive transmission lines are positioned at the center line position of the transmission line frame body;

the radio frequency processing module is arranged at the center of the transmission line frame body, the other ends of the two conductive transmission lines are conductive with the first port group, and the other ends of the other two conductive transmission lines are conductive with the second port group;

The embodiment of the application discloses a radio frequency tag management system which is characterized in that the system comprises: the system comprises a radio frequency tag, a reader and a server;

The reader-writer is used for performing read-write operation on the radio frequency tag, acquiring tag information and sending the tag information to the server;

the server is used for receiving the tag information sent by the reader-writer and storing the tag information.

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

in this embodiment of the present application, an impedance matching network portion of a radio frequency tag includes: the radio frequency tag comprises a first impedance matching sub-part comprising a first subsection and an overlapping part, and a second impedance matching sub-part comprising a second subsection and the overlapping part, wherein the first impedance matching sub-part and the second impedance matching sub-part share the overlapping part, so that the size of an impedance matching network part in the radio frequency tag is greatly reduced, the first impedance matching sub-part and the second impedance matching sub-part share a radiator part, the size of the radio frequency tag is further reduced, in addition, when the radio frequency tag works at two port groups at the same time, the radiator part generates current components with the two ports overlapped at the horizontal direction and the vertical direction, and the radio frequency tag can be identified by a radio frequency reader-writer at all directions around the radio frequency tag, so that the omnidirectional requirement of the radio frequency tag is ensured.

Drawings

FIG. 1 is a schematic structural diagram of a prior art radio frequency tag;

FIG. 2 is a schematic structural diagram of another prior art radio frequency tag;

FIG. 3 is a schematic structural view of the radio frequency tag of the present application;

FIG. 4 is a schematic diagram of an impedance matching network part of the present application;

FIG. 5 is a schematic structural diagram of a radio frequency processing module according to the present application;

FIG. 6 is a schematic diagram of another impedance matching network part of the present application;

FIG. 7 is a schematic view of a radiator portion of the present application;

fig. 8 is a schematic diagram of an application scenario of a radio frequency tag according to the present application;

FIG. 9 is a schematic structural view of another radio frequency tag of the present application;

FIG. 10 is a schematic structural view of another radio frequency tag of the present application;

FIG. 11 is a graph of port input impedance versus frequency for one embodiment of the present application;

FIG. 12 is a graph of the linear relationship between read distance and frequency for a radio frequency tag of the present application;

FIG. 13 is a schematic cross-sectional view of a radio frequency tag of the present application;

FIG. 14 is a radiation pattern of a radio frequency tag of the present application;

fig. 15 is a schematic diagram of a specific application scenario of a radio frequency tag according to the present application;

fig. 16 is a schematic view of a specific application scenario of another radio frequency tag of the present application;

FIG. 17 is a schematic diagram of an assembly of a radio frequency tag and a metal carrier of the present application;

FIG. 18 is a schematic cross-sectional view of another radio frequency tag of the present application;

FIG. 19 is a schematic structural view of another radio frequency tag of the present application;

fig. 20 is a block diagram of a radio frequency tag management system according to the present application.

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.

Referring to fig. 3, a schematic structural diagram of a radio frequency tag according to an embodiment of the present application is shown. Comprising the following steps: an antenna body 10 and a radio frequency processing module 20; the antenna body 10 includes an impedance matching network portion 11 and a radiator portion 12. The radiator 12 is disposed along the periphery of the impedance matching network 11, and the radiator 12 is in conduction with the impedance matching network 11.

Specifically, referring to fig. 4, a schematic structural diagram of an impedance matching network portion according to an embodiment of the present application is shown. The impedance matching network unit 11 includes: the first part 111, the overlapping part 112, the second part 113 and the third part 114, wherein the first part 111 is connected and arranged on the first side A of the overlapping part 112, the second part 113 is connected and arranged on the second side B of the overlapping part 112, and the third part 114 is connected with the second part 113; the first side a is adjacent to the second side B.

Further, referring to fig. 5, a schematic structural diagram of a radio frequency processing module according to an embodiment of the present application is shown. The radio frequency processing module 20 comprises a first port set 21 and a second port set 22.

Further, referring to fig. 5 and 6, fig. 6 shows a schematic structural diagram of another impedance matching network portion according to an embodiment of the present application. The first division and the overlap constitute a first impedance matching sub-section 30, the second division and the overlap constitute a second impedance matching sub-section 40, the first impedance matching sub-section 30 is in communication with the first port group 21, and the second impedance matching sub-section 40 is in communication with the second port group 22.

When the radio frequency tag is in the electromagnetic field environment, the radio frequency processing module 20 can obtain power supply from the electromagnetic field, and when the reader-writer reads the radio frequency tag, the radio frequency processing module 20 can modulate the data to be transmitted in the self memory into radio frequency signals, and the antenna body 10 sends the radio frequency signals to the radio frequency reader-writer so as to enable the reader-writer to analyze the data to obtain the data. In addition, the radio frequency tag may also receive information sent by the radio frequency reader through the antenna body 10. It should be noted that, the radio frequency processing module 20 may be an RFID chip or an integrated circuit with a radio frequency identification function.

The omnidirectional performance of the radio frequency tag means: the ability of the radio frequency tag to be identified by the reader-writer within the 360-degree range of the space indicates that the radio frequency tag has better omnidirectional performance if the radio frequency tag can be identified by the reader-writer within the 360-degree range of the space and the read-write distance of the reader-writer at each position is kept in a consistent range; if the radio frequency tag is in the 360-degree range, positions which cannot be identified by the reader-writer exist, or the read-write distances of the reader-writers at all 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, referring to fig. 5, the rf processing module 20 includes a first port group 21 and a second port group 22; the first port group 21 includes ports a and b disposed on two opposite sides of the rf processing module 20, and the second port group 22 includes ports c and d disposed on the other two opposite sides of the rf processing module 20, so that the rf processing module 20 has two sets of ports disposed diagonally across each other, and each set of ports is independent of each other and has a phase difference of 90 degrees. Referring to fig. 5, the first impedance matching sub-unit 30 is in communication with the ports a and b of the first port group 21, and the second impedance matching sub-unit 40 is in communication with the ports c and d of the second port group 22, and since each group of ports of the rf processing module 20 is independent of each other, the first port group 21 or the second port group 22 can be independently operated, and in addition, the first port group 21 and the second port group 22 can be simultaneously operated.

Further, in fig. 4, the first section 111, the overlapping portion 112, the second section 113 and the third section 114 of the impedance matching network 11 may be connected to each other to form a symmetrical structure, on the one hand, the whole formed by the first section 111 and the overlapping portion 112 is symmetrical to the whole formed by the second section 113 and the third section 114, and the whole formed by the first section 111 and the third section 114 is symmetrical to the whole formed by the second section 113 and the overlapping portion 112; on the other hand, the first portion 111 is symmetrical to the overlapping portion 112, the second portion 113 is symmetrical to the overlapping portion 112, and the first portion 111 and the second portion 113 are respectively disposed on two adjacent sides of the overlapping portion 112.

When the first port group 21 of the rf processing module 20 works alone, the first impedance matching sub-unit 30 including the first sub-unit 111 and the overlapping unit 112 connected with the first port group and the peripheral radiator 12 can obtain the rf energy provided by the first port group 21 and generate a resonant frequency, so that the rf reader-writer can read the rf tag around the radiator 12 according to the resonant frequency, and if the resonant frequency changes, the reading distance of the rf reader-writer also changes.

When the second port group 22 of the rf processing module 20 works alone, the second impedance matching sub-unit 40 connected with the second port group 22 and including the second sub-unit 113 and the overlapping portion 112, and the peripheral radiator 12 can obtain the rf energy provided by the second port group 22 and generate a resonant frequency, so that the rf reader-writer can read the rf tag around the radiator 12 according to the resonant frequency.

Further, the radiator portion 12 in fig. 3 is disposed along the periphery of the impedance matching network portion 11, and in a specific implementation manner of the embodiment of the present application, referring to fig. 7, a schematic structural diagram of a radiator portion of the embodiment of the present application is shown. The radiator 12 may be an inverted-C-shaped radiating oscillator structure, that is, a non-closed structure surrounding the periphery of the impedance matching network 11 and having an opening at one side, and this structural design makes the radiator 12 have current components in both the horizontal direction X and the vertical direction Y when working, and makes the radio frequency reader-writer sense the current components in the 360-degree range of the radio frequency tag.

In this embodiment of the present application, when the radio frequency tag works normally, the first port group 21 and the second port group 22 may work simultaneously, so that the radiator portion 12 has the superposition of the current components generated by the two port groups in the horizontal direction X and the vertical direction Y, and the resonance frequencies generated by the first port group 21 and the second port group 22 respectively may be superposed on the radiator portion 12, thereby further increasing the bandwidth of the radio frequency tag and improving the identified distance of the radio frequency tag.

For example, referring to fig. 2, in the RFID tag of the second prior art, the radiator of the RFID tag adopts a mode in which four vibrators 3 with the same size each work independently, the vibrator 3 at the upper left and the lower right is connected with the port group 1 of the RFID tag, and the radio frequency energy provided by the port group 1 can enable the RFID tag to generate energy which can be identified by the reader-writer at the lower left and the upper right directions; the oscillator 3 at the left lower part and the right upper part is connected with the port group 2 of the RFID tag, and the radio frequency energy provided by the port group 2 can enable the RFID tag to generate energy which can be identified by a reader-writer at the left upper part and the right lower part; when the two groups of ports of the RFID tag work simultaneously, the four vibrators 3 generate the same resonant frequency independently, and the resonant frequencies are not overlapped on the radiator, so that the bandwidth of the RFID tag is smaller, and the reading distance is relatively shorter.

In the embodiment of the present application, referring to fig. 3, when the radio frequency tag works at the same time in two port groups, the radiator 12 has the superposition of the current components generated by the two port groups in the horizontal direction X and the vertical direction Y, and the resonance frequencies generated by the first port group 21 and the second port group 22 are superposed on the radiator 12, so that the reader-writer can identify the superposed resonance frequencies from any direction of the radio frequency tag, ensuring the omnidirectionality of the radio frequency tag, and in addition, compared with the design form that the four impedance matching sub-parts adopted by the RFID tag in the second scheme in fig. 2 are in cross parallel connection and the four vibrators are independently arranged, because the impedance matching network 11 of the radio frequency tag shares one superposition part 112, and the impedance matching sub-parts connected by the two port groups share one radiator part, the size of the radio frequency tag is greatly reduced. For example, in one implementation, the impedance matching network portion 11 may be 18×22mm in size and the radiator portion 12 may be 36×30mm in size.

Further, referring to fig. 8, an application scenario schematic diagram of a radio frequency tag according to an embodiment of the present application is shown. Comprising the following steps: carrier 60, radio frequency tag 13, and radio frequency reader 50.

The rf reader 50 includes an rf antenna, and the rf reader has a built-in power supply or an external power supply, and supplies power to the rf antenna to generate an electromagnetic field 51. When the radio frequency tag 13 is in the electromagnetic field 51, it can obtain energy according to the induced current generated by the electromagnetic field 51, and send a modulation signal to the radio frequency reader/writer 50 through the antenna body 10.

The carrier 60 may be used to carry the radio frequency tag 13 and store information, such as identification information, of the carrier 60 in a memory of the radio frequency tag 13. So that the carrier 60 can read the radio frequency tag 13 on the surface of the carrier 60 by the radio frequency reader-writer 50 under the condition of bearing the radio frequency tag 13, and the information of the carrier 60 can be obtained from the radio frequency tag 13. In one specific implementation, the carrier 60 may be any one of an express package, a commodity, a good, and an apparatus.

In this embodiment of the present application, an impedance matching network portion of a radio frequency tag includes: the radio frequency tag comprises a first impedance matching sub-part comprising a first subsection and an overlapping part, and a second impedance matching sub-part comprising a second subsection and the overlapping part, wherein the first impedance matching sub-part and the second impedance matching sub-part share the overlapping part, so that the size of an impedance matching network part in the radio frequency tag is greatly reduced, the first impedance matching sub-part and the second impedance matching sub-part share a radiator part, the size of the radio frequency tag is further reduced, in addition, the first subsection is symmetrical with the overlapping part in structure, the second subsection is symmetrical with the overlapping part in structure, and the first subsection and the second subsection are connected to be arranged on two adjacent sides of the overlapping part, so that the radiator part arranged around the impedance matching network part is also of a symmetrical structure, and when the radio frequency tag works at two port groups simultaneously, the radiator part generates current components overlapped by two ports in the horizontal direction and the vertical direction, and the radio frequency tag can be recognized by a radio frequency reader-writer in all directions around the radio frequency tag, thereby ensuring the full directivity requirement of the radio frequency tag.

Referring to fig. 3 to 6, a radio frequency tag provided in an embodiment of the present application includes: an antenna body 10 and a radio frequency processing module 20; the antenna body 10 includes an impedance matching network portion 11 and a radiator portion 12; the impedance matching network unit 11 includes: a first section 111, an overlapping section 112 and a second section 113, the radio frequency processing module 20 comprising a first port group 21 and a second port group 22; the first subsection 111 is connected with a first side A of the overlapped part 112, and the second subsection 113 is connected with a second side B of the overlapped part 112; the first side A is adjacent to the second side B; the first subsection 111 and the overlapping portion 112 constitute a first impedance matching sub-portion 30, the second subsection 113 and the overlapping portion 112 constitute a second impedance matching sub-portion 40, the first impedance matching sub-portion 30 is in communication with the first port group 21, and the second impedance matching sub-portion 40 is in communication with the second port group 22; the radiator 12 is disposed along the periphery of the impedance matching network 11, and the radiator 12 is in conduction with the impedance matching network 11.

Alternatively, referring to fig. 4, the first subsection 111 and the overlapping portion 112 have symmetrical structures with each other with a side edge located at the first side a of the overlapping portion 112 as a symmetry axis; the second subsection 113 and the overlapping portion 112 are symmetrical with each other with a side edge on the second side B of the overlapping portion 112 as a symmetry axis.

In the embodiment of the present application, the first section 111, the overlapping portion 112, and the second section 113 of the impedance matching network portion 11 in fig. 4 may be connected to each other to form two symmetrical structures, that is, the first section 111 is symmetrical to the overlapping portion 112, the second section 113 is symmetrical to the overlapping portion 112, and the first section 111 and the second section 113 are respectively disposed on two adjacent sides of the overlapping portion 112.

The radiator 12 in fig. 3 is disposed along the periphery of the impedance matching network 11, and referring to fig. 7, the radiator 12 may specifically be an inverted-C-shaped radiating oscillator structure, that is, a non-closed structure disposed around the periphery of the impedance matching network 11 and having an opening at one side, and this structure is designed so that, when the radiator 12 works, there are current components in both the horizontal direction X and the vertical direction Y. The current component can be sensed by the radio frequency reader-writer within the 360-degree range of the radio frequency tag, and in the embodiment of the present application, when each port group of the radio frequency processing module 20 works independently, the radiator 12 can provide omni-directional performance, that is, the antenna body 10 has omni-directionality when the first port group 21 or the second port group 22 works independently. When the radio frequency tag works normally, the first port group 21 and the second port group 22 can work simultaneously, so that the radiator 12 has the superposition of current components generated by the two port groups in the horizontal direction X and the vertical direction Y, and the omnidirectional performance of the radio frequency tag is further ensured.

Since each group of ports of the rf processing module 20 is independent of each other, the first port group 21 or the second port group 22 may be independently operated, and in addition, the first port group 21 and the second port group 22 may be operated at the same time.

In the embodiment of the present application, the impedance matching network part 11 of the radio frequency tag includes: the first impedance matching sub-section 30 including the first section 111 and the overlapping section 112, and the second impedance matching sub-section 40 including the second section 113 and the overlapping section 112 share one overlapping section 112, which greatly reduces the size of the impedance matching network section 11 in the radio frequency tag. In addition, the two parts share the same radiator part 12, so that the size of the radio frequency tag is further reduced.

The antenna body 10 is etched or printed with a material having good conductivity, such as copper or aluminum, and the impedance matching network portion is formed of microstrip lines, which are equivalent to an inductance coil made of copper or aluminum. In this embodiment, the antenna body has a size of 36x30mm, and the impedance matching network portion has a size of 18x20mm, which is very small compared to a conventional uhf omnidirectionally-oriented radio frequency tag.

In the radio frequency tag illustrated in fig. 3 of the embodiment of the present application, the impedance matching network portion 11 and the radiator portion 12 both form a rectangular structure, so that the appearance of the entire radio frequency tag approximates to the rectangular structure. Of course, the structure of the impedance matching network portion 11 and the radiator portion 12 may be other structures, and the embodiment of the present application does not limit the structure of the impedance matching network portion 11 and the radiator portion 12.

For example, in one implementation of an embodiment of the present application, referring to fig. 9, a schematic structural diagram of another radio frequency tag of an embodiment of the present application is shown. The impedance matching network part 11 of the radio frequency tag forms a circular shape, and the radiator part 12 forms a rectangular shape, wherein the first subsection 111 and the overlapping part 112 are ensured to be symmetrical with each other; the second subsection 113 and the overlapping portion 112 are symmetrical to each other.

In another implementation manner of the embodiment of the present application, referring to fig. 10, a schematic structural diagram of another radio frequency tag of the embodiment of the present application is shown. The impedance matching network part 11 of the radio frequency tag forms a circular shape, and the radiator part 12 forms a circular shape, wherein the first subsection 111 and the overlapping part 112 are ensured to be symmetrical with each other; the second subsection 113 and the overlapping portion 112 are symmetrical to each other.

To sum up, the impedance matching network part of the radio frequency tag provided by the application comprises: the radio frequency tag comprises a first impedance matching sub-part comprising a first subsection and an overlapping part, and a second impedance matching sub-part comprising a second subsection and the overlapping part, wherein the first impedance matching sub-part and the second impedance matching sub-part share the overlapping part, so that the size of an impedance matching network part in the radio frequency tag is greatly reduced, the first impedance matching sub-part and the second impedance matching sub-part share a radiator part, the size of the radio frequency tag is further reduced, in addition, when the radio frequency tag works at two port groups at the same time, the radiator part generates current components with the two ports overlapped at the horizontal direction and the vertical direction, and the radio frequency tag can be identified by a radio frequency reader-writer at all directions around the radio frequency tag, so that the omnidirectional requirement of the radio frequency tag is ensured.

Alternatively, referring to fig. 3 and 4, the rf processing module 20 is disposed at a position where a side of the first side a and a side of the second side B of the overlap 112 intersect.

Specifically, the first port group 21 includes: a first interface a and a second interface b respectively provided at two opposite sides of the radio frequency processing module 20; the second port group 22 includes: a third interface c and a fourth interface d respectively provided on the other two opposite sides of the rf processing module 20;

in this embodiment of the present application, the radio frequency processing module 20 may be disposed at a position near the center of the radio frequency tag, so that the radio frequency processing module 20 overlaps with an intersection point of a side edge of the first side a and a side edge of the second side B of the overlapping portion 112, referring to fig. 3, two ends of the first impedance matching sub-portion 30 may be respectively conducted with the first interface a and the second interface B, thereby implementing conduction between the first impedance matching sub-portion 30 and the first port group 21; both ends of the second impedance matching sub-unit 40 may be respectively connected to the third interface c and the fourth interface d, thereby realizing the connection between the second impedance matching sub-unit 40 and the second port group 22.

It should be noted that, the impedance matching network portion 11 and each port may be connected by conductive adhesive, so that the conductivity between the impedance matching network portion 11 and each port is improved on the basis of ensuring the connection stability.

Alternatively, referring to fig. 3 and 7, the radiator portion 12 includes: a radiating portion body 121, a first connection portion 122, a second connection portion 123, a third connection portion 124, and a fourth connection portion 125 connected to the radiating portion body 121, respectively; the radiation section main body 121 is provided along the periphery of the impedance matching network section 11; the first connection portion 122 is in communication with the first section 111, the second connection portion 123 is in communication with both the first section 111 and the overlap portion 112, the third connection portion 124 is in communication with both the overlap portion 112 and the second section 113, and the fourth connection portion 125 is in communication with the second section 113.

In this embodiment, in order to realize the conduction between the radiator portion 12 and the impedance matching network portion 11, four connection portions may be disposed on the radiator portion main body 121, and the first division 111, the overlapping portion 112, and the second division 113 of the impedance matching network portion 11 may be sequentially connected through these connection portions, specifically, the first connection portion 122, the second connection portion 123, the third connection portion 124, and the fourth connection portion 125 may be coupled to the impedance matching network portion 11, so that the radio frequency signal output by the radio frequency processing module 20 may be transmitted to the radiator portion 12 by the impedance matching network portion 11, and a current component may be generated on the radiator portion 12.

Specifically, in order to ensure normal use of the radio frequency tag, impedance matching between the antenna body and the radio frequency processing module is required, wherein the impedance refers to an impedance effect on a current in a circuit having a resistance, an inductance and a capacitance, the impedance is a physical quantity for representing element performance or a section of circuit electrical performance, a real part of the impedance is referred to as a resistance, an imaginary part of the impedance is referred to as a reactance, an impedance effect on direct current in the circuit is referred to as a capacitance, an impedance effect on alternating current in the circuit is referred to as an inductance, and an impedance effect on alternating current caused by the capacitance and the inductance in the circuit is collectively referred to as a reactance.

In the radio frequency tag, an antenna body is an input end (signal source), a position on the antenna body where a radio frequency processing module is arranged is a load end, and impedance matching refers to a proper matching mode between the antenna body and the radio frequency processing module. If the impedance between the antenna body and the radio frequency processing module is not matched, reflected waves are generated at the load end, standing waves are formed on the antenna body, so that energy cannot be transmitted, and the efficiency of the radio frequency tag is reduced.

In this embodiment of the present application, the rf processing module is a component for generating a capacitive reactance, and the impedance matching network portion is a component for generating an inductive reactance, where impedance matching is implemented between the antenna body and the rf processing module under a condition that the inductive reactance and the capacitive reactance are at least partially cancelled. The specific achievement condition of the impedance matching is that conjugate matching is formed between the inductance of the antenna body and the capacitance of the radio frequency processing module, namely, the real part of the antenna body impedance is the same as the real part of the radio frequency processing module impedance, and the imaginary part of the antenna body impedance is opposite to the imaginary part of the radio frequency processing module impedance.

In one implementation manner of the embodiment of the present application, referring to fig. 3, an impedance matching adjustment manner between the antenna body 10 and the radio frequency processing module 20 includes: the coupling connection area between the radiator portion 12 and the impedance matching network portion 11 is changed by adjusting the sizes of the first, second, third, and fourth connection portions 122, 123, 124, and 125, so that the impedance matching between the antenna body 10 and the rf processing module 20 is adjusted.

The dimensions of the first connection portion 122 individually affect the inductive reactance of the first impedance matching sub-portion 30, the dimensions of the fourth connection portion 125 individually affect the inductive reactance of the second impedance matching sub-portion 40, and the dimensions of the second connection portion 123 and the third connection portion 124 collectively affect the inductive reactance of the first impedance matching sub-portion 30 and the second impedance matching sub-portion 40. The smaller the width or the longer the length of the first connection portion 122, the larger the inductive reactance of the first impedance matching sub-portion 30; the smaller the width or the longer the length of the third connection portion 124, the larger the inductive reactance of the second impedance matching sub-portion 40; the smaller the width or the longer the length of the second and third connection parts 123, 124, the larger the inductive reactance of the first and second impedance matching sub-parts 30, 40.

Alternatively, referring to fig. 7, the radiating part body 121 includes: a first radiating sub-section 126 disposed along the periphery of the first section, a second radiating sub-section 127 disposed along the periphery of the overlap section, a third radiating sub-section 128 disposed along the periphery of the second section; the first radiating sub-portion 126 and the second radiating sub-portion 127 are symmetrical with each other with a side edge at a first side of the overlapping portion as a symmetry axis; the second radiating sub-portion 127 and the third radiating sub-portion 128 are symmetrical to each other with a side edge on the second side of the overlapping portion as a symmetry axis.

In this embodiment of the present application, the first radiating sub-portion 126, the second radiating sub-portion 127, and the third radiating sub-portion 128 of the radiator portion 12 are sequentially disposed along the periphery of the impedance matching network portion, after the first radiating sub-portion 126, the second radiating sub-portion 127, and the third radiating sub-portion 128 are sequentially connected, an inverted-C radiating oscillator structure can be obtained, that is, a non-closed structure surrounding the periphery of the impedance matching network portion 11 and having an opening at one side, and by this structural design, when the radiator portion 12 works, current components are all present in the horizontal direction X and the vertical direction Y, and the radio frequency reader-writer senses the current components within the range of 360 degrees of the radio frequency tag, thereby realizing the omni-directional requirement of the radio frequency tag.

Alternatively, referring to fig. 7, the radiating part body 121 includes: a fourth radiating sub-section 129 connected to the third radiating sub-section 128; a first gap e is formed between the fourth radiating sub-portion 129 and the first radiating sub-portion 126.

In one implementation of the embodiment of the present application, a first gap e is formed between an end of the fourth radiating sub-portion 129 facing away from the third radiating sub-portion 128 and an end of the first radiating sub-portion 126 facing away from the second radiating sub-portion 127. The impedance matching adjustment mode between the antenna body 10 and the radio frequency processing module 20 further includes: the width of the first slot e is adjusted, so that impedance matching between the antenna body 10 and the radio frequency processing module 20 is adjusted, the smaller the width of the first slot e, the longer the electrical length of the antenna body 10, the width of the first slot e is changed, and input impedance of the antenna body 10 can be changed until the input impedance of the antenna body 10 is conjugate matched with the impedance of the radio frequency processing module 20.

It should be noted that, the first slot e is disposed at the end of the radiator 12, so that capacitive loading can be implemented at the end of the radiator 12, so as to widen the bandwidth of the antenna body 10 in the resonant state or add an additional new resonance point, which is equivalent to loading a capacitor at the end of the radiator 12 and loading a capacitive element at the end of the antenna in the mode of an equivalent circuit, which is an effective means for changing the impedance of the antenna.

Alternatively, referring to fig. 7, the radiator portion 12 includes: an impedance adjusting section 120 provided at an end of the fourth radiating sub-section 129 remote from the third radiating sub-section 128; the first connection part 122 is disposed at one end of the first radiating sub-part 126 near the fourth radiating sub-part 129; a first gap e is formed between the impedance adjusting section 120 and the first connecting section 122.

In the embodiment of the present application, when the length of the first slot e is longer, the effect of changing the input impedance of the antenna body 10 is more obvious when the width of the first slot e is changed, so that the length of the first slot e can be increased by forming the first slot e through the impedance adjusting portion 120 and the first connecting portion 122, and the purpose of adjusting the width of the first slot e can be achieved by only changing the size of the impedance adjusting portion 120.

Optionally, referring to fig. 3 and 7, the impedance matching network part 11 further includes: a third section 114, the third section 114 being connected to the second section 113; the fourth radiating sub-portion 129 is disposed along the circumference of the third subsection 114; the impedance adjusting section 120 and the third section 114 form a second gap f therebetween.

In one implementation manner of the embodiment of the present application, the impedance matching adjustment manner between the antenna body 10 and the radio frequency processing module 20 further includes: the size of the impedance adjusting section 120 is adjusted to change the width of the second slot f, so as to adjust the impedance matching between the antenna body 10 and the rf processing module 20, and the smaller the width of the second slot f, the longer the electrical length of the antenna body 10, and the width of the second slot f is changed, and the input impedance of the antenna body 10 can be changed until the input impedance of the antenna body 10 is conjugate matched with the impedance of the rf processing module 20. The principle of the impedance change of the second slot f to the antenna body 10 may refer to the first slot e, which is not described herein.

It should be noted that, by adjusting the widths of the first slot e and the second slot f at the same time, a relatively obvious change of the input impedance of the antenna body 10 may be achieved, and in addition, only the width of the first slot e or the second slot f may be adjusted, so as to achieve an accurate modification of the input impedance of the antenna body 10.

Alternatively, referring to fig. 3 and 7, the impedance adjusting section 120 includes a first adjusting sub-section 1201 and a second adjusting sub-section 1202; the width of the second adjustment sub-portion 1202 is greater than the width of the first adjustment sub-portion 1201; one end of the first adjuster portion 1201 is connected to one end of the fourth radiator portion 129 remote from the third radiator portion 128, and the other end of the first adjuster portion 1201 is connected to one end of the second adjuster portion 1202; the third subsection 114 is provided with a groove corresponding to the second adjusting sub-part 1202, and a second gap f is formed between the second adjusting sub-part 1202 and the groove.

In this embodiment of the present application, the impedance adjusting portion 120 includes two branches, and adjusts the width of the first adjusting sub-portion 1201, so that the width of the first gap e can be quickly changed, and the larger the width of the first adjusting sub-portion 1201, the smaller the width of the first gap e; the width of the second adjustment sub-portion 1202 is adjusted so that the width of the second slit f can be changed quickly, and the larger the width of the second adjustment sub-portion 1202 is, the smaller the width of the second slit f is.

Alternatively, referring to fig. 3 to 6, the first port group 21 includes: a first interface a and a second interface b respectively provided at two opposite sides of the radio frequency processing module 20; the second port group 22 includes: a third interface c and a fourth interface d respectively provided on the other two opposite sides of the rf processing module 20; the impedance matching network unit 11 includes: a first conductive transmission line 115 having one end connected to the first interface a, a second conductive transmission line 116 having one end connected to the third interface c, a third conductive transmission line 117 having one end connected to the second interface b, a fourth conductive transmission line 118 having one end connected to the fourth interface d, a first connection transmission line 119, a second connection transmission line 110, and a third connection transmission line 1101; the other end of the first conductive transmission line 115 and the other end of the second conductive transmission line 116 are connected by a first connection transmission line 119; the other end of the second conductive transmission line 116 is connected to the other end of the third conductive transmission line 117 through the second connection transmission line 110; the other end of the third conductive transmission line 117 and the other end of the fourth conductive transmission line 118 are connected by a third connection transmission line 1101; the first conductive transmission line 115 and the first connection transmission line 119 constitute a first division 111, and the second conductive transmission line 116, the second connection transmission line 110, and the third conductive transmission line 117 constitute an overlap 112; the fourth conductive transmission line 118 and the third connection transmission line 1101 constitute a second division 113.

In the embodiment of the present application, the rf processing module 20 includes four ports disposed in a crossed and opposite manner, and each pair of opposite ports is a port group; the impedance matching network 11 includes four conductive transmission lines, which may be microstrip line structures, and three connection transmission lines, which sequentially connect the four ports, and the three connection transmission lines connect and seal one ends of the four conductive transmission lines facing away from the rf processing module 20.

In one implementation manner of the embodiment of the present application, the impedance matching adjustment manner between the antenna body 10 and the radio frequency processing module 20 further includes: the impedance matching between the antenna body 10 and the rf processing module 20 is adjusted by changing the size of the impedance matching network section 11 by adjusting the sizes of the first conductive transmission line 115, the second conductive transmission line 116, the third conductive transmission line 117, the fourth conductive transmission line 118, the first connection transmission line 119, the second connection transmission line 110, and the third connection transmission line 1101.

Wherein, the sizes of the first connection transmission line 119 and the first conduction transmission line 115 independently influence the inductive reactance of the first impedance matching sub-section 30; the dimensions of the fourth conductive transmission line 118 and the third connection transmission line 1101 individually affect the inductive reactance of the second impedance matching sub-section 40; the dimensions of the second conductive transmission line 116, the third conductive transmission line 117, and the second connection transmission line 110 collectively affect the inductive reactance of the first impedance matching sub-section 30 and the second impedance matching sub-section 40. The smaller the width or the longer the length of the first connection transmission line 119 or the first conduction transmission line 115, the larger the inductance of the first impedance matching sub-section 30; the smaller the width or the longer the length of the fourth conductive transmission line 118 and the third connection transmission line 1101, the larger the inductance of the second impedance matching sub-section 40; the smaller the width or the longer the length of the second conductive transmission line 116, the third conductive transmission line 117, and the second connection transmission line 110, the larger the inductive reactance of the first impedance matching sub-section 30 and the second impedance matching sub-section 40.

Alternatively, the impedance matching network part 11 forms an integrally formed structure, and the radiator part 12 forms an integrally formed structure.

In this embodiment of the present application, a separate design of the impedance matching network portion and the radiator portion may be adopted, and the size of the impedance matching network portion 11 may be fixed, and an integrally formed structure is formed, so that the requirements for reducing the production and processing link cycles of the impedance matching network portion may be met, and the same impedance matching network portion may be used for radiator portions with different sizes, so as to reduce the inventory pressure of the impedance matching network portion.

In the case that the same impedance matching network part is used for radiator parts with different sizes, keeping the size of the impedance matching network part unchanged, the impedance matching adjustment mode between the antenna body and the radio frequency processing module may include: referring to fig. 3, the sizes of the first, second, third and fourth connection parts 122, 123, 124 and 125 of the radiator portion 12 are adjusted; the width of the first gap e and the second gap f are adjusted. The adjusting modes are numerous and can be mutually combined, so that the aim of matching and adjusting the impedance between the antenna body and the radio frequency processing module is fulfilled under the condition of low adjusting difficulty.

Alternatively, referring to fig. 5, the width of the first connection transmission line 119 is different from the width of the third connection transmission line 1101.

Alternatively, the size of the impedance matching network part 11 includes 18×22mm, the size of the radiator part 12 includes 36×30mm, the width of the first connection transmission line 119 is 0.5mm, and the width of the third connection transmission line 1101 is 1mm.

In this embodiment of the present application, the radio frequency processing module 20 includes two port groups, so that a mode of simultaneous operation of two port groups can be implemented, where the first port group 21 corresponds to the first impedance matching sub-portion 30 of the impedance matching network portion 11 including the first connection transmission line 119; the second port group 22 includes a second impedance matching sub-section 40 of the third connection transmission line 1101 in the impedance matching network section 11.

Specifically, the width of the first connection transmission line 119 is set to be different from the width of the third connection transmission line 1101, so that different inductive reactance may be introduced into the first impedance matching sub-unit 30 and the second impedance matching sub-unit 40, and finally, the input impedance of the antenna body 10 at the first port group 21 and the second port group 22 is different, so that the resonance frequency generated by the first port group 21 corresponding to the resonance frequency transmitted by the second port group 22 corresponding to the resonance frequency is different. Because the antenna body 10 has omnidirectionality when the first port group 21 and the second port group 22 respectively work, when the first port group 21 and the second port group 22 work simultaneously, the antenna body 10 can generate two different resonant frequencies and work simultaneously in all directions so as to achieve superposition of the two resonant frequencies, thereby effectively increasing the bandwidth of the radio frequency tag and improving the dielectric resistance of the radio frequency tag.

For example, in the case where the size of the impedance matching network portion 11 is 18×22mm, the size of the radiator portion 12 is 36×30mm, the width of the first connection transmission line 119 is 0.5mm, and the width of the third connection transmission line 1101 is 1mm, referring to fig. 11 and 12, fig. 11 shows a linear relationship diagram between port input impedance and frequency. Fig. 12 shows a linear relationship between the read distance and the frequency of a radio frequency tag. Wherein the real and imaginary parts of the input impedance at the first port group 21 and the second port group 22 are shown in fig. 11, respectively. Further, since the input impedance of the antenna body at the first port group 21 and the second port group 22 is different, two center frequencies of 915MHz and 935MHz are generated as shown in fig. 12. Fig. 12 is a plot of read distance of radio frequency tags in free space as a function of frequency, the read distance data based on 2W EPR effective output power and a 6dBi linearly polarized antenna. As can be seen from fig. 12, the theoretical maximum reading distance of the radio frequency tag can reach 10 meters, and the bandwidth is close to 100MHz when the reading distance is more than 6 meters. So that it can achieve better read performance and bandwidth while having smaller physical dimensions.

Optionally, the impedance matching network portion and the radiator portion form an integrally formed structure. In the embodiment of the application, the impedance matching network part and the radiator part can be integrally formed into an integral structure, so that the coupling connection mode of the four connection parts of the radiator part and the impedance matching network part is changed into an integral connection mode, the assembly links of the impedance matching network part and the radiator part are reduced, and the production efficiency is improved.

Optionally, referring to fig. 13, a schematic cross-sectional structure of a radio frequency tag is shown, where the radio frequency tag further includes: a first dielectric layer 70, a second dielectric layer 71, and an adhesive layer 72; the impedance matching network 11 is disposed on the first dielectric layer 70, and the radiator 12 is disposed on the second dielectric layer 71; the surface of the impedance matching network 11 facing away from the first dielectric layer 70 and the surface of the radiator 12 facing away from the second dielectric layer 71 are connected by an adhesive layer 72; the radio frequency processing module 20 is disposed between the impedance matching network 11 and the adhesive layer 72; the first dielectric layer 70 and the second dielectric layer 71 are made of a material having a dielectric loss tangent value less than or equal to a predetermined threshold value.

In this embodiment of the present application, the radiator portion and the impedance matching network portion may be carried by a dielectric layer, and the antenna body and the radio frequency processing module are disposed between two dielectric layers, where the dielectric layer may also play a role in protecting the antenna body and the radio frequency processing module, and the materials of the first dielectric layer 70 and the second dielectric layer 71 are materials with dielectric loss tangent values less than or equal to a preset threshold, such as a thermoplastic polyester (PET, polyethylene terephthalate) film and a polyimide film. The impedance matching network part and the radiator part are bonded through the adhesive layer, and the radio frequency processing module is positioned between the impedance matching network part and the adhesive layer, so that the protection effect on the radio frequency processing module is further improved.

In summary, referring to fig. 14, a radiation pattern of a radio frequency tag is shown, and fig. 14 is a radiation pattern of a radio frequency tag in an embodiment of the present application, where an E-plane is an electric field plane, and refers to a direction plane parallel to the direction of the electric field; the H plane is a magnetic field plane and refers to a direction plane parallel to the magnetic field direction. As can be seen from fig. 14, in the embodiment, the radio frequency tag has uniform and stable values within 360 degrees of the E plane and the H plane, and has good omnidirectionality.

In a specific application scenario of the radio frequency tag in the embodiment of the present application, referring to fig. 15, a specific application scenario schematic diagram of the radio frequency tag is shown, including: carrier 60, radio frequency tag 13, server 62, and handheld reader 50. In the storage warehouse scene, the carriers 60 can be express packages, the radio frequency tag 13 is attached to the surface of each express package, the goods information of each express package is stored in the radio frequency tag 13 attached to the surface of each express package, the carrier 60 is carried on the goods shelf 61, the goods picking personnel 51 can hold the handheld reader-writer 50 by hand, the radio frequency tag 13 close to each carrier 60 is controlled to generate the electromagnetic field 51, and when the radio frequency tag 13 is positioned in the electromagnetic field 51, the energy obtained according to the induction current generated by the electromagnetic field 1 can be obtained, and the stored goods information of the carriers 60 is sent to the handheld reader-writer 50. The picker 51 performs picking operation on the carriers 60 according to the goods information of each carrier 60 received by the handheld reader 50, and in addition, the picker 51 may upload the goods information of each carrier 60 received by the handheld reader 50 to the server 62 for storage, so as to record the goods information of each carrier 60 by the server 62.

In addition, in the scenario shown in fig. 15, the purpose of monitoring inventory in real time can also be achieved, in the scenario of the storage warehouse, a multi-tag reader-writer 52 can be further arranged in the warehouse, the multi-tag reader-writer 52 can perform read-write operation on the radio frequency tags 13, the multi-tag reader-writer 52 can count the number of the radio frequency tags 13 read through performing read operation on all the radio frequency tags 13 in the warehouse, and further according to the number of the radio frequency tags 13, the number of the carriers 60 is counted, and the number of the carriers 60 is sent to the server 62, so that the acquisition of the inventory of the carriers 60 in the warehouse by the server 62 is achieved. Further, the multi-tag reader 52 can achieve the purpose of monitoring the warehouse inventory in real time by performing the reading operation once every preset time period, for example, the multi-tag reader 52 can perform the reading operation once every 1 hour.

In a specific application scenario of the radio frequency tag in the embodiment of the present application, referring to fig. 16, a schematic diagram of a specific application scenario of another radio frequency tag is shown, including: the radio frequency tag 13, the service end 62 and the multi-tag reader 52. In the home indoor scene, the carrier may be home articles 63, such as a sofa, a dust collector, a refrigerator, etc., each home article 63 has a radio frequency tag 13 attached to a surface thereof, and article information of each home article 63 is stored in the radio frequency tag 13 attached thereto. The multi-tag reader-writer 52 can perform read-write operation on the radio frequency tags 13, the multi-tag reader-writer 52 can count the number of the radio frequency tags 13 read by performing read operation on all the radio frequency tags 13, further count the number of the household articles 63 according to the number of the radio frequency tags 13, and send the number of the household articles 63 to the server 62, so that the state of the server 62 on the household articles 63 is monitored, and whether the household articles 63 are lost or not is judged. Further, a reminding module, such as a light source, a buzzer, a speaker, etc., may be further disposed in the radio frequency tag 13, the service end 62 may control the multi-tag reader-writer 52 to send radio frequency signals to the radio frequency tag 13, and the radio frequency tag 13 may control the reminding module to perform reminding operations, such as lighting the light source, sounding the buzzer/speaker, etc., so that indoor personnel may quickly find the position of the household article 63 according to the reminding effect of the reminding module, when the household article 63 is a small article easy to be lost, by using this method, the position of the household article 63 may be quickly found, thereby reducing the loss probability of the household article 63.

Alternatively, referring to fig. 17, there is shown an assembly schematic diagram of the radio frequency tag and the metal carrier, when the radio frequency tag 13 is disposed on the metal carrier 60, the third portion 113 and the second portion 114 form a connection portion C, part or all of the area of the connection portion C is connected to the metal carrier 60, and the second slit f is exposed outside the metal carrier 60.

The radio frequency tag 13 may be disposed on a surface of the carrier 60 and used for storing information related to the carrier 60, but when the carrier 60 is made of metal, for example, the carrier is metal equipment, a metal box, a metal package, a metal housing, etc., the conventional RFID tag shown in fig. 1 and 2 may be affected by the metal carrier 60, so that energy of electromagnetic waves of the radio frequency tag 13 is absorbed and lost by the metal carrier 60 in a radiation process, and a phenomenon of impedance mismatch between an antenna body and a radio frequency processing module is generated, which results in performance degradation of the radio frequency tag.

In this embodiment, referring to fig. 3, since the first impedance matching sub-portion 30 connected to the first port group 21 and the second impedance matching sub-portion 40 connected to the second port group 22 can work independently of each other, when the radio frequency tag 13 is assembled with the metal carrier 60, part or all of the area of the connection portion C can be connected with the metal carrier 60, when the radio frequency tag 13 works, the second impedance matching sub-portion 40 can not work normally due to the shielding of the second sub-portion 114 by the metal carrier 60, but the first impedance matching sub-portion 30 is all exposed outside the metal carrier 60, i.e. the first port group 21 of the radio frequency processing module can keep working normally, and the first impedance matching sub-portion 30 and the radiator portion 12 can have all directionality in the working frequency band when working independently, so that the omnidirectional requirement when the radio frequency tag 13 is assembled with the metal carrier 60 can be satisfied. In addition, the second gap f needs to be exposed outside the metal carrier 60, and if the second gap f is blocked by the metal carrier 60, the whole radio frequency tag will fail.

Further, after the assembly of the metal carrier 60 and the radio frequency tag 13 is completed, the upper half part of the radiator 12 may be equivalent to a vibrator, the right half part of the radiator 12 may be equivalent to a part of the metal carrier 60 connected with the radiator 12 and be equivalent to a ground, the part of the metal carrier 60 is equivalent to a mirror image part of the radiator 12, a current in a reverse direction is generated, a mirror image current is formed on the surface of the metal carrier 60, the gain of the radio frequency tag is greatly improved, and the read-write performance of the radio frequency tag 13 when assembled on the metal carrier 60 is further improved.

Optionally, referring to fig. 18, a schematic cross-sectional structure of another radio frequency tag is shown, where the radio frequency tag further includes: a package 80; the antenna body and the radio frequency processing module 20 are disposed inside the packaging part 80, and a barcode layer 90 is disposed on the surface of the packaging part 80.

In this embodiment of the present application, the antenna body of the radio frequency tag and the radio frequency processing module 20 are external, and may further be wrapped with a packaging portion 80, where the packaging portion 80 has a sealed cavity, and the sealed cavity may effectively protect the antenna body and the radio frequency processing module 20 inside.

In addition, the surface of the packaging part 80 is provided with a barcode layer 90, the barcode layer 90 may include a graphic code, the graphic code may include a two-dimensional code, a barcode, and the like, and tag information uniquely corresponding to the radio frequency tag and article information of an article to which the radio frequency tag is attached may be recorded in the graphic code, so that in a radio frequency tag application scenario, the graphic code on the surface of the barcode layer 90 can be scanned by a code scanning device, and tag information of the radio frequency tag and article information of the article are obtained.

In the embodiment of the application, the radio frequency tag can store the same information as the information recorded by the graphic code of the bar code layer, and in a specific application scene, the read operation can be performed on the radio frequency tag through a reader-writer to acquire the tag information uniquely corresponding to the recorded radio frequency tag and the article information of the article to which the radio frequency tag is attached. However, when the radio frequency tag cannot be read normally due to the influence of the surrounding environment, the code scanning device can further scan the graphic codes of the bar code layer, so that the tag information uniquely corresponding to the radio frequency tag recorded in the code scanning device and the article information of the article attached by the radio frequency tag are obtained, and the success rate of reading the information is improved.

Referring to fig. 19, another schematic structural diagram of a radio frequency tag is provided in an embodiment of the present application, including: an antenna body 01 and a radio frequency processing module 02; the antenna body 01 includes an impedance matching network portion 011 and a radiator portion 012; the radio frequency processing module 02 includes: a first port group and a second port group; the impedance matching network section 011 includes: a transmission line housing 0111, and four conductive transmission lines 0112 connected to the transmission line housing 0111; one end of the two conductive transmission lines 0112 is respectively arranged on two opposite sides of the transmission line frame 0111, one end of the other two conductive transmission lines 0112 is respectively arranged on the other two opposite sides of the transmission line frame 0111, and the conductive transmission lines 0112 are positioned at the center line of the transmission line frame 0111; the radio frequency processing module 02 is arranged at the center of the transmission line frame 0111, the other ends of the two conductive transmission lines 0112 are conductive with the first port group, and the other ends of the other two conductive transmission lines 0112 are conductive with the second port group; the radiator 012 is provided along the periphery of the impedance matching network portion 011, and the radiator 012 is in conduction with the impedance matching network portion 011.

In this embodiment of the present application, the specific structures of the first port group and the second port group of the radio frequency processing module 02 may refer to fig. 5 of the foregoing embodiment, which is not repeated herein.

Specifically, the impedance matching network portion 011 is a "field" shaped structure, and is a symmetrical structure, and the radiator portion 012 is disposed along the periphery of the impedance matching network portion 011, so that the radiator portion 012 may be specifically an inverted-C shaped radiating oscillator structure, that is, a non-closed structure surrounding the periphery of the impedance matching network portion 011 and having an opening at one side. The current component can be sensed by the radio frequency reader-writer within 360 degrees of the radio frequency tag.

Since each group of ports of the rf processing module 02 is independent of each other, the first port group or the second port group may operate independently, and in addition, the first port group and the second port group may also operate simultaneously.

When the first port group of the radio frequency processing module 02 works alone, the upper half part of the impedance matching network portion 011 can be equivalent to one inductance coil, the lower half part of the impedance matching network portion 011 can be equivalent to the other inductance coil, the two inductance coils are mutually connected in parallel, inductive reactance is introduced, and the peripheral radiator portion 012 can obtain radio frequency energy provided by the first port group and generate resonant frequency, so that the radio frequency reader-writer can read the radio frequency tag around the radiator portion 012 according to the resonant frequency.

When the second port group of the radio frequency processing module 02 works alone, the left half part of the impedance matching network portion 011 can be equivalently an inductance coil, the right half part of the impedance matching network portion 011 can be equivalently another inductance coil, the two inductance coils are mutually connected in parallel, inductive reactance is introduced, and the peripheral radiator portion 012 can obtain radio frequency energy provided by the second port group and generate resonant frequency, so that the radio frequency reader-writer can read the radio frequency tag around the radiator portion 012 according to the resonant frequency.

In this application embodiment, when the radio frequency tag normally works, the first port group and the second port group can work simultaneously, so that the radiator 012 has the superposition of the current components generated by the two port groups in the horizontal direction and the vertical direction, and the resonance frequencies generated by the first port group and the second port group can be superposed on the radiator 012, thereby further increasing the bandwidth of the radio frequency tag and improving the identified distance of the radio frequency tag.

In the embodiment of the present application, the impedance matching network portions 011 corresponding to the first port group and the second port group share one overlapping portion 112, so that the size of the impedance matching network portion 011 in the radio frequency tag is greatly reduced. In addition, the two parts share one radiator part 012, which further reduces the size of the radio frequency tag.

In the radio frequency tag illustrated in fig. 19 of the embodiment of the present application, the impedance matching network portion 011 and the radiator portion 012 both constitute a rectangular structure, so that the external shape of the entire radio frequency tag approximates to the rectangular structure. Of course, the structure formed by the impedance matching network portion 011 and the radiator portion 012 may be other structures, and the specific structure formed by the impedance matching network portion 011 and the radiator portion 012 in the embodiment of the present application may refer to the above embodiment, and will not be described here again.

Optionally, the radiator portion includes: a radiating portion main body, a first connecting portion, a second connecting portion, a third connecting portion and a fourth connecting portion connected with the radiating portion main body, respectively; the radiation part main body is arranged along the periphery of the impedance matching network part; the first connecting part, the second connecting part, the third connecting part and the fourth connecting part are sequentially conducted with the four conducting transmission lines.

In particular, the description of the specific structure of the radiator portion may refer to the related description of fig. 7 in the above embodiment, which is not repeated herein.

Alternatively, referring to fig. 19, the radiator part 012 includes: an impedance adjusting part 0121 arranged at one end of the radiating part main body; the radiation part body is provided around the impedance matching network part from one end of the radiation part body, and a first gap g is formed between the impedance adjusting part 0121 and the other end of the radiation part body.

Specifically, the specific structures of the impedance adjusting section 0121 and the first slit g may be described with reference to fig. 7 in the above embodiment, which is not described herein.

Alternatively, referring to fig. 19, a second gap h is formed between the impedance adjusting section 0121 and the transmission line housing 0111.

Specifically, the specific structures of the impedance adjusting section 0121 and the second slit h may be described with reference to the related description of fig. 3 in the above embodiment, which is not repeated here.

Optionally, the impedance adjusting section includes a first adjusting sub-section and a second adjusting sub-section; the width of the second regulating sub-part is larger than that of the first regulating sub-part; one end of the first regulator part is connected with one end of the radiating part main body, and one end of the second regulator part at the other end of the first regulator part is connected with one end of the radiating part main body; a first gap is formed between the first adjusting sub-part and the first connecting part; a second gap is formed between the second adjusting sub-part and the transmission line frame body.

Specifically, the specific structure of the impedance adjusting section 0121 may be described with reference to the related description of fig. 3 in the above embodiment, and will not be described herein.

Optionally, the radio frequency tag further includes: the first dielectric layer, the second dielectric layer and the bonding layer; the impedance matching network part is arranged on the first dielectric layer, and the radiator part is arranged on the second dielectric layer; the impedance matching network part is connected with the radiator part through the bonding layer between the surface of the impedance matching network part, which is away from the first dielectric layer, and the surface of the radiator part, which is away from the second dielectric layer; the radio frequency processing module is arranged between the impedance matching network part and the bonding layer; the first dielectric layer and the second dielectric layer are made of materials with dielectric loss tangent values smaller than or equal to a preset threshold value.

Specifically, the description of the specific structures of the first dielectric layer, the second dielectric layer and the adhesive layer of the radio frequency tag may refer to the related description of fig. 13 in the foregoing embodiment, which is not repeated herein.

Optionally, the impedance matching network part forms an integrally formed structure, and the radiator part forms an integrally formed structure.

Optionally, the impedance matching network portion and the radiator portion form an integrally formed structure.

Specifically, the description of the impedance matching network portion and the radiator portion with respect to the integral structure may refer to the related description in the foregoing embodiment, which is not repeated herein.

Optionally, the radio frequency tag further includes: a packaging part; the antenna body and the radio frequency processing module are arranged in the packaging part, and a bar code layer is arranged on the surface of the packaging part.

Specifically, the description of the package portion and the barcode layer may refer to the related description in the foregoing embodiments, which is not repeated herein.

In summary, according to the radio frequency tag provided by the application, the impedance matching network part of the radio frequency tag is of a symmetrical structure, and the radiator part is arranged along the periphery of the impedance matching network part, so that the radiator part has current components in the horizontal direction and the vertical direction when the radio frequency tag works at the same time in two port groups. The current component can be sensed by the radio frequency reader-writer within 360 degrees of the radio frequency tag. And the impedance matching network parts corresponding to the two port groups share one radiator part, so that the size of the radio frequency tag is reduced.

Referring to fig. 20, which illustrates a radio frequency tag management system, the system includes: radio frequency tag, reader-writer and server;

the server is used for receiving the label information sent by the reader-writer and storing the label information.

In an embodiment of the present application, the reader-writer may include a radio frequency antenna, where the reader-writer has a built-in power supply or an external power supply for supplying power to the radio frequency antenna, so that the radio frequency antenna generates an electromagnetic field. When the radio frequency tag is in the electromagnetic field, the tag information can be sent to the reader-writer through the antenna body according to the energy obtained by the induction current generated by the electromagnetic field. The tag information may record identification information unique to the radio frequency tag and article information of an article to which the radio frequency tag is attached.

The server can communicate with the reader-writer, receives the label information sent by the reader-writer and stores the label information so as to realize the management of the radio frequency label and the articles attached by the radio frequency label according to the label information.

Optionally, the system further comprises: a scanning device;

the scanning equipment is used for scanning the bar code layer outside the radio frequency tag to obtain bar code information and sending the bar code information to the server under the condition that the read-write operation of the radio frequency tag by the reader-writer fails;

The server is used for receiving the bar code information sent by the scanning equipment and storing the bar code information.

In the embodiment of the application, the radio frequency tag is provided with the bar code layer, the bar code layer can comprise a graphic code, the graphic code can comprise a two-dimensional code, a bar code and the like, tag information uniquely corresponding to the radio frequency tag and article information of an article to which the radio frequency tag is attached can be recorded in the graphic code, so that in an application scene of the radio frequency tag, the graphic code on the surface of the bar code layer can be scanned by a code scanning device, and the tag information of the radio frequency tag and the article information of the article can be obtained.

The radio frequency tag can store the same information as the information recorded by the graphic code of the bar code layer, and in a specific application scene, the reader-writer can firstly read the radio frequency tag to obtain the tag information uniquely corresponding to the recorded radio frequency tag and the article information of the article attached by the radio frequency tag. However, when the radio frequency tag cannot be read normally due to the influence of the surrounding environment, the code scanning device can further scan the graphic codes of the bar code layer, so that the tag information uniquely corresponding to the radio frequency tag recorded in the code scanning device and the article information of the article attached by the radio frequency tag are obtained, and the success rate of reading the information is improved.

Specifically, the description of the specific application scenario of the radio frequency tag management system may refer to the related descriptions of fig. 15 and fig. 16, which are not repeated herein.

In summary, the radio frequency tag management system provided in the present application includes: the system comprises a radio frequency tag, a reader and a server; the reader-writer is used for performing read-write operation on the radio frequency tag, acquiring tag information and sending the tag information to the server; the server is used for receiving the tag information sent by the reader-writer and storing the tag information. The impedance matching network part of the radio frequency tag is of a symmetrical structure, and the radiator part is arranged along the periphery of the impedance matching network part, so that the radiator part has current components in the horizontal direction and the vertical direction when the radio frequency tag works at the same time in two port groups. The current component can be sensed by the radio frequency reader-writer within 360 degrees of the radio frequency tag. And the impedance matching network parts corresponding to the two port groups share one radiator part, so that the size of the radio frequency tag is reduced.

In this specification, each embodiment is described in a progressive manner, and each embodiment is mainly described by differences from other embodiments, and identical and similar parts between the embodiments are all enough to be referred to each other.

Embodiments of the present application are described with reference to flowchart illustrations and/or block diagrams of methods, terminal devices (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing terminal device to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing terminal device, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

While preferred embodiments of the present embodiments have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the embodiments of the present application.

Finally, it is further noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal 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 terminal. 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 terminal device comprising the element.

The above description has been made in detail on a radio frequency tag and a radio frequency tag management system provided in the present application, and specific examples are applied herein to illustrate the principles and embodiments of the present application, where the above description of the examples is only for helping to understand the method and core ideas of the present application; 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

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

the first subsection and the overlapping part form a first impedance matching sub-part, the second subsection and the overlapping part form a second impedance matching sub-part, the first impedance matching sub-part is communicated with the first port group, and the second impedance matching sub-part is communicated with the second port group; wherein the first impedance matching sub-portion and the second impedance matching sub-portion share one of the overlapping portions, and the first impedance matching sub-portion and the second impedance matching sub-portion share one of the radiator portions;

The radiator part is arranged along the periphery of the impedance matching network part, and is communicated with the impedance matching network part; the radiator part is a non-closed structure which is arranged around the impedance matching network part and is provided with an opening at one side;

the radiator portion includes: a radiating portion main body, a first connection portion, a second connection portion, a third connection portion, and a fourth connection portion connected to the radiating portion main body, respectively; the radiator part further comprises an impedance adjusting part; a first gap is formed between the impedance adjusting part and the first connecting part;

the radiation part main body is arranged along the periphery of the impedance matching network part;

the first connecting part is communicated with the first subsection, the second connecting part is communicated with the first subsection and the overlapped part at the same time, the third connecting part is communicated with the overlapped part and the second subsection at the same time, and the fourth connecting part is communicated with the second subsection;

the radiating portion main body includes: a first radiating sub-portion disposed along a periphery of the first section, a second radiating sub-portion disposed along a periphery of the overlap portion, and a third radiating sub-portion disposed along a periphery of the second section;

The first radiating sub-part and the second radiating sub-part are symmetrical with each other by taking the side edge positioned at the first side of the overlapping part as a symmetrical axis;

the second radiating sub-part and the third radiating sub-part are symmetrical with each other by taking the side edge positioned at the second side of the overlapping part as a symmetrical axis.

2. The radio frequency tag of claim 1, wherein the first subsection and the overlap portion are symmetrical about a side edge on a first side of the overlap portion; the second subsection and the overlapping part are symmetrical with each other by taking the side edge positioned on the second side of the overlapping part as a symmetrical axis.

3. The radio frequency tag of claim 2, wherein the radio frequency processing module is disposed at a location where a side edge of the first side and a side edge of the second side of the overlap intersect.

4. The radio frequency tag of claim 1, wherein the radiating portion body comprises: a fourth radiating sub-section connected to the third radiating sub-section;

the first slit is formed between the fourth radiating sub-portion and the first radiating sub-portion.

5. The radio frequency tag of claim 4, wherein the radiator portion comprises: the impedance adjusting part is arranged at one end of the fourth radiating sub-part far away from the third radiating sub-part;

The first connecting portion is arranged at one end of the first radiating sub-portion, which is close to the fourth radiating sub-portion.

6. The radio frequency tag of claim 5, wherein the impedance matching network section further comprises: a third section connected to the second section;

the fourth radiating sub-portion is arranged along the periphery of the third subsection;

and a second gap is formed between the impedance adjusting part and the third subsection.

7. The radio frequency tag of claim 6, wherein the impedance adjustment section comprises a first adjustment sub-section and a second adjustment sub-section;

the width of the second regulating sub-part is larger than that of the first regulating sub-part; one end of the first regulator part is connected with one end of the fourth radiator part, which is far away from the third radiator part, and the other end of the first regulator part is connected with one end of the second regulator part;

and a groove corresponding to the second adjusting sub-part is arranged in the third subsection, and a second gap is formed between the second adjusting sub-part and the groove.

8. The radio frequency tag according to claim 6, wherein when the radio frequency tag is disposed on a metal carrier, the third portion and the second portion form a connection portion, a part or all of an area of the connection portion is connected to the metal carrier, and the second slit is exposed outside the metal carrier.

9. The radio frequency tag of any of claims 1-8, the first port group comprising: the first interface and the second interface are respectively arranged on two opposite sides of the radio frequency processing module; the second port group includes: the third interface and the fourth interface are respectively arranged on the other two opposite sides of the radio frequency processing module;

the impedance matching network section includes: a first conductive transmission line with one end connected with the first interface, a second conductive transmission line with one end connected with the third interface, a third conductive transmission line with one end connected with the second interface, a fourth conductive transmission line with one end connected with the fourth interface, a first connection transmission line, a second connection transmission line and a third connection transmission line;

the other end of the first conductive transmission line is connected with the other end of the second conductive transmission line through the first connection transmission line;

the other end of the second conduction transmission line is connected with the other end of the third conduction transmission line through the second connection transmission line;

the other end of the third conductive transmission line is connected with the other end of the fourth conductive transmission line through the third connection transmission line;

The first conductive transmission line and the first connection transmission line form the first subsection, and the second conductive transmission line, the second connection transmission line and the third conductive transmission line form the overlapping part; the fourth conductive transmission line and the third connection transmission line constitute the second subsection.

10. The radio frequency tag of claim 9, wherein the first connecting transmission line has a width different from a width of the third connecting transmission line.

11. The radio frequency tag of claim 1, further comprising:

the first dielectric layer, the second dielectric layer and the bonding layer;

the impedance matching network part is arranged on the first medium layer, and the radiator part is arranged on the second medium layer;

the surface of the impedance matching network part, which is away from the first dielectric layer, is connected with the surface of the radiator part, which is away from the second dielectric layer, through the bonding layer;

the radio frequency processing module is arranged between the impedance matching network part and the bonding layer;

the first dielectric layer and the second dielectric layer are made of materials with dielectric loss tangent values smaller than or equal to a preset threshold value.

12. The radio frequency tag of claim 1, wherein the impedance matching network portion comprises an integrally formed structure and the radiator portion comprises an integrally formed structure.

13. The radio frequency tag of claim 1, wherein the impedance matching network portion and the radiator portion form an integrally formed structure.

14. The radio frequency tag of claim 1, further comprising: a packaging part;

the antenna body and the radio frequency processing module are arranged in the packaging part, and a bar code layer is arranged on the surface of the packaging part.

15. A radio frequency tag management system, the system comprising: the radio frequency tag according to any one of claims 1 to 14, a reader and a server;

16. The system of claim 15, wherein the system further comprises: a scanning device;

The scanning equipment is used for scanning a bar code layer outside the radio frequency tag to obtain bar code information and sending the bar code information to the server under the condition that the read-write operation of the radio frequency tag by the reader-writer fails;