CN109286061B

CN109286061B - Tag antenna

Info

Publication number: CN109286061B
Application number: CN201811110181.8A
Authority: CN
Inventors: 陈镇
Original assignee: Ruijie Networks Co Ltd
Current assignee: Ruijie Networks Co Ltd
Priority date: 2018-09-21
Filing date: 2018-09-21
Publication date: 2021-03-05
Anticipated expiration: 2038-09-21
Also published as: CN109286061A

Abstract

The embodiment of the application provides a tag antenna. On one hand, due to the effect that the tag chip is suspended outside the object to be identified and the tail end is loaded, the influence of the material of the object to be identified on the performance of the tag antenna can be reduced; on the other hand, the slot is arranged on the side, which faces the tag chip, of the first end loading, the feeder line of the tag chip extends to the inside of the loading end, and a gap formed by the feeder line and the first slot forms a part of the small electric ring.

Description

Tag antenna

Technical Field

The application relates to the technical field of antennas, in particular to a tag antenna.

Background

An electronic tag, also called a tag antenna, is a data carrier of a Radio Frequency Identification (RFID) system, and mainly includes an antenna arm and a tag chip. Compared with the traditional bar code identification technology, the tag antenna has the advantages of large information capacity, repeated rewriting, capability of realizing 'one object and one code' in the true sense, capability of simultaneously identifying a plurality of objects in a long distance, strong anti-pollution capability and the like, and is widely applied to various retail industries such as unmanned super, intelligent goods shelves and the like.

In the shopping process based on the electronic tag, when the commodity passes through the settlement channel, the cash register system identifies the electronic tag on the commodity and automatically settles the settlement with the customer account bound in advance, so that the unmanned commodity retail is realized. However, the existing electronic tag is not ideal in anti-transfer performance, so that a situation that a customer maliciously escapes the order may occur, namely, the customer leaves the electronic tag on a shelf and takes away the goods, and certain economic loss is brought to a retailer.

Disclosure of Invention

Aspects of the present application provide a tag antenna for improving the anti-transfer performance of an electronic tag, and further reducing economic loss.

The embodiment of the application provides a tag antenna, including: the tag comprises a first end load, a second end load, a bent antenna arm and a tag chip, wherein the first end load is used for being installed on an object to be identified, the second end load is used for being suspended outside the object to be identified, and the bent antenna arm and the tag chip are arranged between the first end load and the second end load;

wherein, one side of the first end loading towards the label chip is provided with a first slot; one end of the tag chip is electrically connected with the bent antenna arm, and the other end of the tag chip is electrically connected with the bottom end of the first slot through a first feeder line extending to the bottom end of the first slot;

the bent antenna arm is electrically connected with the first end load and the second end load respectively, and the bent antenna arm, the tag chip, the first feeder line and the first end load form an electrical small loop.

The tag antenna provided by the embodiment of the application comprises: the tag comprises a first end load, a second end load, and a bent antenna arm and a tag chip which are arranged between the first end load and the second end load. In the embodiment of the application, on one hand, due to the effect that the tag chip is suspended outside the object to be identified and the loading end, the influence of the material of the object to be identified on the performance of the tag antenna can be reduced; on the other hand, the slot is arranged on the side, which faces the tag chip, of the first end, a feeder line of the tag chip can extend to the inside of the loading end, and a gap formed by the feeder line and the slot forms a part of the small electric ring.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:

fig. 1a is a schematic diagram illustrating an operating principle of a tag antenna according to an embodiment of the present application;

fig. 1b is a schematic structural diagram of a tag antenna according to an embodiment of the present application;

fig. 1c is a schematic structural diagram of a tag antenna installed on an object to be identified according to an embodiment of the present application;

the following is a description of the reference numerals in the drawings:

s1-reader; 10-a tag antenna; 101-first end loading; 101 a-first slot; 101 b-a second slot; 102-second end loading; 102 a-inverted L-shaped structure in second end loading; 102 b-an "I" font structure in second end loading; 103-bending the antenna arm; 103 a-a first bending sub-arm; 103 b-a second bending sub-arm; 103a 1-a tapered antenna arm of a bow-type in a first bent sub-arm; 103a 2-L-shaped antenna arm in the first bent sub-arm; 104-a tag chip; 105-a first feed line; 106-electrical ringlet; 106 a-an L-shaped slot in the electrical ringlet; 106 b-a line-shaped slit in the electrical small ring; 107-second feed line.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

To a technical problem that a transfer prevention effect of an existing tag antenna is not ideal, an embodiment of the present application provides a tag antenna, including: the tag comprises a first end load, a second end load, a bent antenna arm and a tag chip, wherein the first end load is installed on an object to be identified, the second end load is used for being suspended outside the object to be identified, and the bent antenna arm and the tag chip are arranged between the first end load and the second end load. In the embodiment of the application, on one hand, due to the effect that the tag chip is suspended outside the object to be identified and the loading end, the influence of the material of the object to be identified on the performance of the tag antenna can be reduced; on the other hand, the slot is arranged on the side, which faces the tag chip, of the first end, a feeder line of the tag chip can extend to the inside of the loading end, and a gap formed by the feeder line and the slot forms a part of the small electric ring.

The technical solutions provided by the embodiments of the present application are described in detail below with reference to the accompanying drawings.

It should be noted that: like reference numerals refer to like objects in the following figures and embodiments, and thus, once an object is defined in one figure, further discussion thereof is not required in subsequent figures.

Fig. 1a is a schematic diagram of an operating principle of a tag antenna according to an embodiment of the present application. As shown in fig. 1a, reader S1 emits an electromagnetic wave signal of a particular frequency, carrying an interrogation command, and simultaneously powers tag antenna 10. The tag antenna 10 absorbs electromagnetic wave energy, converts the electromagnetic wave energy into electrical energy to power the tag chip in the tag antenna 10 to operate, and returns a backscatter signal to the reader S1 using the backscatter principle. After the reader S1 receives the data, the data returned by the tag antenna 10 is demodulated from the signal, so as to complete the complete communication.

As can be seen from the operation principle of the tag antenna shown in fig. 1a, the tag antenna plays a role of receiving and transmitting signals during RFID communication, and the design thereof is very important. Moreover, when the impedance of the tag antenna and the impedance matched with the tag antenna chip reach conjugate matching, the performance of the tag antenna is better. Moreover, the tag antenna is generally attached or stuck to the surface of the object to be identified when in use, wherein the material of the object to be identified has a significant influence on the impedance of the tag antenna, so the influence of the material of the object to be identified on the performance of the tag antenna needs to be considered when designing.

Based on the above analysis, an embodiment of the present application provides a tag antenna, a schematic structural diagram of which is shown in fig. 1b, and the tag antenna 10 includes: a first end load 101 mounted on the object to be identified, a second end load 102 for being suspended outside the object to be identified, and a meander antenna arm 103 and a tag chip 104 arranged between the first end load 101 and the second end load 102. The schematic structural diagram of the tag antenna mounted on the object to be identified is shown in fig. 1 c.

Considering that the outer package of the object to be identified may be made of metal or tin foil, such as a pop can, if the tag chip 104 contacts with the outer package of the object to be identified, the tag chip 104 may be short-circuited, and the tag antenna 10 may be disabled. Therefore, in the embodiment, the tag chip 104 is suspended outside the object to be identified, so that the influence of the material of the object to be identified on the performance of the tag antenna can be reduced.

Further, considering that the object to be identified may be a non-metal container containing liquid, such as a plastic bottle beverage, when the tag antenna 10 is attached to the surface of the container, the liquid may cause the resonant frequency point of the tag antenna 10 to shift to a low frequency portion, and reduce the gain of the tag antenna 10. Based on this, in this embodiment, the tag antenna 10 is provided with the first end loading 101 and the second end loading 102, wherein the equivalent capacitance of the tag antenna 10 can be changed by adjusting the first end loading 101 and the second end loading 102, so that the bandwidth of the tag antenna 10 can be expanded to a certain extent, frequency offset caused by liquid can be further compensated, and the influence of the material of the object to be identified on the performance of the tag antenna 10 is further reduced.

In this embodiment, as shown in fig. 1b, the side W1 of the first end load 101 facing the tag chip 104 is provided with a first slot 101 a. One end of the tag chip 104 is electrically connected to the bent antenna arm 103. The other end of the tag chip 104 is electrically connected to the bottom end of the first slot 101a through a first feed line 105 extending to the bottom end of the first slot 101 a.

Furthermore, as shown in fig. 1b, in the present embodiment, the folded antenna arm 103 is electrically connected to the first end load 101 and the second end load 102, respectively, and the sides of the folded antenna arm 103, the tag chip 104, the first power feed line 105 and the first slot 103a form an electrical small loop 106. For convenience of description and distinction, in the present embodiment, a connection point between the bent antenna arm 103 and the first end load 101 is defined as a second connection point B; the connection point of the meander antenna arm 103 to the second end load 102 is defined as the third connection point C.

Alternatively, the first slot 103a may be a U-shaped slot, a U-shaped slot with a straight bottom end, or a U-shaped slot with a broken bottom end as shown in fig. 1b, but is not limited thereto.

It should be noted that, when the outer package of the object to be identified may be made of a metal material or a tin foil material, such as a pop can, in this embodiment, since the first end loading 101 of the tag antenna 10 is attached to the outer metal package, and the outer metal package is matched with the first end loading 101, the capacitance of the tag antenna 10 is enhanced, and the bandwidth of the tag antenna 10 is further expanded. However, this mounting reduces the inductance of the tag antenna 10, which in this embodiment can be compensated for by adjusting the length, width, or shape of the slot of the electrical small loop 106.

The tag antenna provided by the embodiment of the application comprises: the tag comprises a first end load, a second end load, and a bent antenna arm and a tag chip which are arranged between the first end load and the second end load. In the embodiment, on one hand, due to the effect that the tag chip is suspended outside the object to be identified and the loading end, the influence of the material of the object to be identified on the performance of the tag antenna can be reduced; on the other hand, the slot is arranged on the side, which faces the tag chip, of the first end loading, the feeder line of the tag chip extends to the inside of the loading end, and a gap formed by the feeder line and the first slot forms a part of the small electric ring.

Considering that the implementation form of the bent antenna arm 103 mainly affects the real part of the impedance of the tag antenna 10, the implementation form of the bent antenna arm 103 may be adjusted according to the impedance required by different tag chips 104. Optionally, as shown in fig. 1b, the bent antenna arm 103 includes: a first bending sub-arm 103a and a second bending sub-arm 103b, and the end D of the first bending sub-arm 103a bends downward to be electrically connected with the second bending sub-arm 103 b. Optionally, as shown in fig. 1b, the first bending sub-arm 103a extends from the end D thereof to a first distance along the horizontal direction, then bends downward and extends to a second distance along the vertical direction, and then is electrically connected to the second bending sub-arm 103 b.

Further, as shown in fig. 1b, the first bending sub-arm 103a includes: a bow-shaped tapered antenna arm 103a1 and an L-shaped antenna arm 103a 2; wherein, the top end E of the vertical edge of the L-shaped antenna arm 103a2 is electrically connected with the starting end F of the bow-shaped tapered antenna arm 103a 1; for convenience of description and distinction, a connection point between the top end E of the vertical side of the L-shaped antenna arm 103a2 and the starting end F of the bow-shaped tapered antenna arm 103a2 is defined as a first connection point a, and the connection point a is electrically connected to the tag chip 104; the tip G of the lateral side of L-shaped antenna arm 103a2 is electrically connected to side W1 of first end load 101 facing tag chip 104. Alternatively, as shown in fig. 1B, the top end G of the transverse side of the L-shaped antenna arm 103a2 is electrically connected to the bottom end of the side W1 of the first end load 101 facing the tag chip 104, and the connection point thereof is the second connection point B.

Further, as shown in fig. 1b, the end of the antenna arm 103a1 with a zigzag tapered shape, i.e. the end D of the first bending sub-arm 103a, is bent downward to be electrically connected to the second bending sub-arm 103 b. Optionally, the tapered antenna arm 103a1 includes 1.5 "bows," the first "bow" having a height greater than the second "bow" from its starting end F.

It should be noted that, in the embodiment of the present application, the "bow" may be a regular "bow" or may be an irregular "bow" like structure. The specific implementation form of the antenna arms 103a1 with the reduced arch form, the number of the "arch" and the height and width of each "arch" in the antenna arms 103a1 with the reduced arch form are not limited, and the antenna arms can be flexibly set according to the performance indexes such as the frequency band, the bandwidth and the radiation efficiency covered by the tag antenna 10 to be achieved and the requirement of the conjugate impedance required by the tag chip 104.

Alternatively, as shown in fig. 1b, in order to achieve performance indexes such as coverage band, bandwidth, radiation efficiency, and the like of the tag antenna 10 and to make the impedance of the tag antenna 10 conjugate-match with the impedance required by the tag chip 104, the width of the L-shaped antenna arm 103a2 < the width of the bow-shaped tapered antenna arm 103a 1. Alternatively, the L-shaped antenna arm 103a2 has equal width at each location, and the bow-shaped tapered antenna arm 103a1 has equal width at each location.

Further, considering that the implementation form of the bent antenna arm 103 mainly affects the real part of the impedance of the tag antenna 10, the implementation form of the second bent sub-arm 103b may be adjusted according to the impedance required by different tag chips 104. Alternatively, as shown in fig. 1b, the second bent sub-arm 103b may be a character-type antenna arm, which includes at least one character, preferably, the character-type antenna arm includes at least two characters, wherein two adjacent characters are electrically connected; and a first of the at least two characters is electrically connected to the second end load 102; the last of the at least two characters is electrically connected to the downward bent portion of the end D of the first bent antenna arm 103 a. It should be noted that, in the embodiment of the present application, one of the at least one character that is farthest from the tag chip 104 is defined as a first character; the one of the at least one character that is closest to the tag chip 104 is defined as the last character. For example, as shown in FIG. 1b, the character is "Hello", then the letter H is the first character and the letter o is the last character, wherein every two adjacent letters in "Hello" are electrically connected to each other.

It should be noted that, in fig. 1b and fig. 1c, only one character is shown as a letter, and the number of the letters is 5, alternatively, the character in the character-type antenna arm may also be at least one of a chinese character, a number, a letter, a punctuation mark, or a combination thereof, but is not limited thereto, and the number, the font, and the like of the character are not limited. That is, in the embodiment of the present application, the implementation form, font, and number of the characters in the character-type antenna arm are not limited, and they may be flexibly set according to the performance indexes such as the frequency band covered by the tag antenna, radiation efficiency, and the like that are desired to be achieved, and the requirement of the impedance required by the tag chip 104.

Further, in order to improve the bandwidth of the tag antenna 10 and also consider the radiation efficiency, in this embodiment, as shown in fig. 1b, the first end loading 101 and the bent antenna arm 103 are electrically connected to the tag chip 104 in a balanced coupling manner. Here, the balanced coupling mode means that the length of the first power feed line 105, which is a power feed line to which the tag chip 104 and the first end load are connected, is approximately equal to the length of a power feed line (defined as the second power feed line 107 for convenience of description and distinction) to which the meander antenna arm 103 is connected, and preferably, the length of the first power feed line 105 is equal to the length of the second power feed line 107. Further, the width of the first power feeding line 105 is approximately equal to the width of the second power feeding line 107. Preferably, the width of the first power feed line 105 is equal to the width of the second power feed line 107.

Alternatively, as shown in FIG. 1b, the second feed line 107 may be a Z-like structure; and the vertical side of the Z-shaped structure is perpendicular to the two transverse sides, and the length of the upper transverse side is greater than that of the lower transverse side.

In another alternative embodiment, as shown in fig. 1b, the electrical small loop 106 surrounded by the bent antenna arm 103, the tag chip 104, the first feeding line 105 and the side of the first slot 101a includes: an L-shaped slot 106a formed by the connection line of the first connection point a with the tag chip 104, i.e., the second power feed line 107, the L-shaped antenna arm 103a2 and the first power feed line 105, and a "line" -shaped slot 106b formed by the first power feed line 105 and the side wall of the first slot 101 a. Alternatively, as shown in fig. 1b, the first slot is a U-shaped slot with a broken line at the bottom end, and the depth of the "one" -shaped slot 106b extending to the first end load 101 is greater than the depth of the first feeding line 105 extending to the first end load 101.

Further, as shown in fig. 1b, the width of the L-shaped slot 106a is greater than the width of the "in-line" slot 106 b.

In the present embodiment, the antenna arm 103 and the first feeding line 105 are bent to form an electrical small loop 106 in a manner of slotting on the first end load 101, so as to adjust the inductance value of the tag antenna 10, i.e. the imaginary part of the impedance of the tag antenna 10. Therefore, by adjusting the circumference and the area of the electrical small loop 106, the impedance of the tag antenna 10 can be quickly adjusted without changing other parts of the tag antenna 10, so as to perform impedance matching on the tag chip 104 with different required impedances.

In order to further achieve the performance of the tag antenna 10, such as the required frequency band and bandwidth, enhancing the radiation efficiency of the tag antenna 10, and adjusting the impedance of the tag antenna 10 to achieve conjugate matching with the tag chip 104, optionally, a second slot 101b may be formed at the bottom end W2 of the first end loading 101, where the second slot 101b cannot penetrate through the side of the first slot 101 a.

It should be noted that, the shapes, depths, and widths of the first slot 101a and the second slot 101b may be adaptively adjusted according to performance indexes, such as a frequency band and radiation efficiency, required by the tag antenna 10 and a conjugate impedance required by the tag chip 104, which is not limited in the embodiment of the present application.

Optionally, the depth of the second slot 101b is less than the depth of the first slot 101 a. Alternatively, the second slot 101b may be a U-shaped slot, or a U-shaped slot with a straight bottom end as shown in fig. 1b, but is not limited thereto.

In yet another alternative embodiment, as shown in FIG. 1b, the second end load 102 comprises: an inverted-L structure 102a and an "I" structure 102 b. One end of the "I" -shaped structure 102b is electrically connected to the top end H of the long side of the inverted-L-shaped structure 102a, and the other end is electrically connected to the bent antenna arm 103, specifically, the other end is electrically connected to the second bent sub-arm 103b in the bent antenna arm 103, and the connection point is the third connection point C.

It should be noted that the lengths and widths of the inverted-L structure 102a and the "I" structure 102b may be adaptively adjusted according to performance indexes, such as a frequency band and radiation efficiency, required by the tag antenna 10 and a conjugate impedance required by the tag chip 104, which is not limited in the embodiment of the present application. Alternatively, as shown in fig. 1b, the width of the long side of the inverted-L structure 102a > the width of the short side of the inverted-L structure 102a > "I" structure 102 b.

It should be noted that, for the tag antenna 10 provided in fig. 1b and 1c, the other components except for the tag chip 104 are metal film layers, such as aluminum foil, copper foil, etc., but not limited thereto.

Further, in the tag antenna 10 provided in fig. 1b and 1c in the embodiment of the present application, other components except for the tag chip 104 are an integrated structure.

It should be noted that, in the tag antenna 10 shown in fig. 1b and 1c, in order to distinguish the components of the tag antenna 10, the components are shown in different patterns, but do not represent the actual structure thereof, as shown in fig. 1b and 1c, and when the components are actually etched, the same metal film layer may be coated on and completely cover the components.

It should be noted that the directions in the embodiments of the present application, such as the bottom side W3 of the first end load 101, etc., are exemplarily described according to the directions shown in fig. 1b, and are not limited thereto. When the tag antenna 10 is rotated by a certain angle, these directions are also changed accordingly.

Based on the tag antenna 10 provided in fig. 1b and the above-mentioned embodiments, when it is mounted on the object 20 to be identified for use, as shown in fig. 1c, the first loading terminal 101 and the first feeding line 105 are attached to the surface of the object 20 to be identified; and the tag chip 104, the bent antenna arm 103 and the second end load 102 are all suspended outside the object 20 to be identified.

It should be noted that, for the tag antenna 10 provided in the above embodiments, the distance d1 between the side W3 of the first end load 101 facing away from the tag chip 104 and the edge of the object 20 to be identified and the distance d2 between the tag chip 104 and the edge of the object 20 to be identified may be adaptively adjusted according to different types of tag chips.

Optionally, a distance d1 between the side W3 of the first end load 101 facing away from the tag chip 104 and the edge of the object 20 to be identified is within a preset first distance range. Optionally, the first distance is in the range of 10mm-24mm, that is, the value of d1 may be any value between 10mm-24mm, such as 15mm, 20mm, etc., but is not limited thereto.

Further, the distance d2 between the tag chip 104 and the edge of the object 20 to be identified is a preset first distance threshold. Optionally, the first distance threshold is greater than or equal to 2 mm.

It should be noted that, the descriptions of "first", "second", etc. in this document are used for distinguishing different messages, devices, modules, etc., and do not represent a sequential order, nor limit the types of "first" and "second" to be different.

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

The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A tag antenna, comprising: the tag comprises a first end load, a second end load, a bent antenna arm and a tag chip, wherein the first end load is used for being installed on an object to be identified, the second end load is used for being suspended outside the object to be identified, and the bent antenna arm and the tag chip are arranged between the first end load and the second end load;

the bent antenna arm is electrically connected with the first tail end loading and the second tail end loading respectively, and the bent antenna arm, the tag chip, the first feeder line and the side edge of the first slot form an electrical small ring;

the bent antenna arm comprises a first bent sub-arm and a second bent sub-arm; the tail end of the first bending sub-arm is bent downwards and is electrically connected with the second bending sub-arm;

the first bending sub-arm comprises an L-shaped antenna arm and a Chinese character 'bow' tapered antenna arm; wherein the content of the first and second substances,

the top end of the vertical edge of the L-shaped antenna arm is electrically connected with the starting end of the bow-shaped decreasing antenna arm; the top end of the vertical edge of the L-shaped antenna arm and the connection point of the starting end of the arc-shaped decreasing antenna arm are also electrically connected with the tag chip; the top end of the transverse edge of the L-shaped antenna arm is electrically connected with one side, which faces the tag chip, of the first tail end loading; the tail end of the bow-shaped tapered antenna arm is bent downwards and is electrically connected with the second bent sub-arm.

2. The antenna of claim 1, wherein the width of the L-shaped antenna arm < the width of the tapered bow antenna arm.

3. The antenna of claim 1, wherein the second bent sub-arm is a character-type antenna arm, the character-type antenna arm comprising at least two characters, adjacent two of the at least two characters being electrically connected; a first of the at least two characters is in loaded electrical connection with the second end; the last character of the at least two characters is electrically connected with the downward bent part of the tail end of the Chinese character tapered antenna arm.

4. The antenna of claim 1, wherein the first end loading and the meander antenna arm are electrically coupled to the tag chip in a balanced coupling;

the balanced coupling mode refers to the length of a feeder line which is loaded and connected with the tag chip and the first tail end and is equal to the length of a feeder line which is connected with the bent antenna arm.

5. The antenna of claim 1 or 2, wherein the electrical ringlet comprises: the tag comprises a tag chip, an L-shaped slot and a linear slot, wherein the tag chip is provided with a connecting line, the L-shaped slot is formed by the connecting line of the top end of the vertical edge of the L-shaped antenna arm and the starting end of the bow-shaped tapered antenna arm, the L-shaped slot is formed by the L-shaped antenna arm and the first feeder line, and the linear slot is formed by the first feeder line and the side wall of the first slot.

6. The antenna of claim 5, wherein the width of the L-shaped slot is greater than the width of the I-shaped slot.

7. The antenna of any of claims 1-4, wherein the bottom side of the first end loading is provided with a second slot; the depth of the second slot is less than the depth of the first slot.

8. The antenna of claim 7, wherein the first slot and the second slot are U-shaped slots.

9. The antenna of any of claims 1-4, wherein the second end loading comprises: an inverted L-shaped structure and an I-shaped structure; one end of the I-shaped structure is electrically connected with the top end of the long edge of the inverted L-shaped structure, and the other end of the I-shaped structure is electrically connected with the bent antenna arm.

10. The antenna of claim 9, wherein the width of the long side of the inverted-L structure > the width of the short side of the inverted-L structure > the width of the "I" shaped structure.

11. An antenna according to any of claims 1 to 4, wherein the first end load is attached to the surface of the object to be identified with the first feed line when the tag antenna is mounted for use on the object to be identified; the tag chip, the bent antenna arm and the second end loading are all suspended outside the object to be identified.

12. The antenna of claim 11, wherein a distance between a side of the first end loading facing away from the tag chip and an edge of the object to be identified is within a preset first distance range.

13. The antenna of claim 12, wherein the distance between the tag chip and the edge of the object to be identified is greater than a preset first distance threshold.