CN203813020U - UHF RFID Tag Antenna - Google Patents

Abstract

An ultra-high-frequency RFID tag antenna comprises an annular antenna and a radiation antenna. The annular antenna comprises an opening. The radiation antenna comprises a first antenna body and a second antenna body which are located on two sides of an opening of the annular antenna respectively. Each of the first antenna body and the second antenna body comprises a longitudinally extended first part, a transversely extended second part and an echo enhancing structure. Contact points of the first parts of the first and the second antenna bodies and the annular antenna are located on the half of the annular antenna opposite to the opening, and the tail end of the second part is connected to the echo enhancement structure. The tag antenna is small in occupied area and long in reading distance.

Description

UHF RFID Tag Antenna

technical field

The utility model relates to the field of antennas, in particular to an ultra-high frequency RFID tag antenna. the

Background technique

Radio Frequency Identification (RFID) technology is an automatic identification technology that has emerged in recent years. The basic components of its system include RFID electronic tags, RFID readers and antennas. Among them, the antenna is a device that receives or radiates the radio frequency signal power of the radio transceiver in the form of electromagnetic waves. In the RFID system, the antenna is divided into two types: tag antenna and reader antenna. The goal of the tag antenna is to transmit the maximum energy into and out of the tag chip: when transmitting, convert high-frequency current into electromagnetic waves; when receiving, convert electromagnetic waves into high-frequency current. If the RFID electronic tag is attached to a specific object and stores specific information, the identification of the specific object can be realized by reading the data in the tag. Therefore, RFID tags have been widely used in logistics management, retail management, Book management, asset management, personnel identification and other fields. the

But the reading distance of existing RFID tags is relatively short. the

Contents of the invention

The problem solved by the utility model is to provide an ultra-high frequency RFID tag antenna, which occupies a small area and has a long reading distance. the

In order to solve the above problems, the embodiment of the utility model provides a UHF RFID tag antenna, including a loop antenna and a radiation antenna, the loop antenna has an opening, and the radiation antenna includes a first antenna body and a second antenna body, The first antenna body and the second antenna body are respectively located on both sides of the opening of the loop antenna, and both the first antenna body and the second antenna body include a longitudinally extending first part, a laterally extending second part and an echo enhancement structure The contact point between the first part of the first antenna body and the second antenna body and the loop antenna is located on the half loop antenna opposite to the opening, and the tail end of the second part is connected to the echo enhancement structure. the

Optionally, the echo enhancement structure is a "T"-shaped structure or an "L"-shaped structure. the

Optionally, when the echo enhancement structure is a "T"-shaped structure, the tail end of the second part is connected to one end of the lateral part of the "T"-shaped structure. the

Optionally, when the echo enhancement structure is a "T"-shaped structure, the length ranges from 14 mm to 16 mm, and the width ranges from 8 mm to 10 mm. the

Optionally, the width of the "T"-shaped structure is greater than the widths of the first part and the second part. the

Optionally, the first antenna body and the second antenna body are mirror images of a line connecting the center of the loop antenna and the opening. the

Optionally, the first part and the second part have an S-shaped structure. the

Optionally, the total height of the UHF tag antenna is 25.5 mm to 27.5 mm. the

Optionally, the line widths of the first part and the second part range from 1.5 mm to 2.5 mm. the

Optionally, the opening serves as a fixing point for the label chip. the

Compared with the prior art, this technical solution has the following advantages: by dividing the radiating antenna into a first part extending longitudinally, a second part extending laterally and an echo enhancement structure, the area occupied by the UHF tag antenna is relatively small. Small, long reading distance. the

Description of drawings

Fig. 1 is the structural representation of the UHF tag antenna of the utility model embodiment;

Fig. 2 is a test result diagram of the UHF tag antenna according to the embodiment of the present invention. the

Detailed ways

The technical solutions of the present utility model will be clearly and completely described below through specific embodiments in conjunction with the accompanying drawings. the

Please refer to Fig. 1, which is a schematic structural diagram of a UHF RFID tag antenna according to an embodiment of the present invention, the UHF RFID tag antenna includes a loop antenna 1 and a radiation antenna, the loop antenna 1 has an opening 3, and the The radiating antenna includes a first antenna body 4 and a second antenna body 5, the first antenna body 4 and the second antenna body 5 are respectively located on both sides of the opening 3 of the loop antenna 1, the first antenna body 4, the second antenna body The body 5 includes a longitudinally extending first portion 6, a laterally extending second portion 7 and an echo enhancement structure 8, and the contact point 9 between the first antenna body and the second antenna body first portion 6 and the loop antenna 1 is located at the same On the half of the loop antenna opposite to the opening 3 , and the tail end of the second part 7 is connected to the echo enhancement structure 8 . the

In this embodiment, the loop antenna 1 is circular, and the diameter of the loop antenna 1 is 6mm-9mm. In other embodiments, the loop antenna may also be an ellipse or the like. the

The opening 3 serves as a fixing point for the UHF tag chip, and the tag chip straddles the opening 3 so that the loop antennas on both sides of the opening 3 are connected. In this embodiment, the tag chip is a UHF RFID tag chip, and correspondingly, the tag antenna is a UHF RFID tag antenna. In other embodiments, the tag antenna may also be a tag antenna of other bands. the

The contact point 9 between the first part 6 of the first antenna body and the second antenna body and the loop antenna 1 is located on the half loop antenna opposite to the opening 3, so that the first part 6 can extend longitudinally, and the longitudinal direction is shown in FIG. The direction parallel to the Y-axis in 1 can effectively utilize the area occupied by the antenna. On the premise of not reducing the length of the first antenna body and the second antenna body, by increasing the height D of the UHF tag antenna, it can reduce The width of the UHF tag antenna can reduce the area of the antenna. In this embodiment, the total height of the UHF tag antenna is 25.5 mm to 27.5 mm, and the first antenna body and the second antenna body are mirror-symmetrical about the center of the loop antenna and the line connecting the opening. the

Since the first antenna body 4 and the second antenna body 5 both include a longitudinally extending first portion, a transversely extending second portion and an echo enhancement structure, the transverse direction is a direction parallel to the X axis in FIG. 1 , and the The first part and the second part have an S-shaped structure, so that the area of the antenna can be reduced without reducing the length of the first antenna body and the second antenna body. In this embodiment, the first part and the second part have an S-shaped structure, and in other embodiments, the first part and the second part may also have multiple S-shaped structures. the

The width of the echo enhancement structure is larger than the line width of the first part and the second part, and the echo enhancement structure can reduce the return loss and increase the reading distance. In this embodiment, the echo enhancement structure 8 is a "T"-shaped structure, the length of the "T"-shaped structure ranges from 14 mm to 16 mm, and the width ranges from 8 mm to 10 mm. The tail end of the second portion is connected to one end of the transverse portion of the "T" shaped structure. In other embodiments, the echo enhancement structure may also be an "L"-shaped structure, and the tail end of the second part is connected to the turning point of the "L"-shaped structure. the

In this embodiment, the line width of the first part and the second part ranges from 1.5 mm to 2.5 mm, and the line width of the "T" shape structure is larger than the line width of the first part and the second part, which is beneficial to improve reading distance. the

Please refer to FIG. 2 , which is a test result diagram of the UHF tag antenna according to the embodiment of the present invention, wherein the ordinate is the return loss, and the abscissa is the echo frequency. In this embodiment, the return loss of the UHF tag antenna near freq=915MHz is small, and the corresponding return loss dB(S11_fitted)=-10.222, so the reading of the tag antenna near the frequency of 915MHz The distance is larger. the

Although the utility model has been disclosed as above with preferred embodiments, it is not intended to limit the utility model, and any person skilled in the art can utilize the method and technology disclosed above without departing from the spirit and scope of the utility model The content makes possible changes and modifications to the technical solution of the utility model. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the utility model without departing from the content of the technical solution of the utility model shall be It belongs to the protection scope of the technical solution of the utility model. the

Claims (10)

1. a ultra-high frequency RFID label antenna, it is characterized in that, comprise loop aerial and radiating antenna, described loop aerial has opening, described radiating antenna comprises the first antenna body and the second antenna body, described the first antenna body and the second antenna body lay respectively at the opening both sides of loop aerial, described the first antenna body, the second antenna body all comprises the Part I of longitudinal extension, the Part II of horizontal expansion and echo strengthen structure, described the first antenna body, the Part I of the second antenna body is positioned on half loop aerial relative with opening with the contact point of loop aerial, and the tail end of described Part II strengthens structure with echo and is connected.

2. ultra-high frequency RFID label antenna as claimed in claim 1, is characterized in that, it is "T"-shaped structure or " L " shape structure that described echo strengthens structure.

3. ultra-high frequency RFID label antenna as claimed in claim 2, is characterized in that, in the time that described echo enhancing structure is "T"-shaped structure, the tail end of described Part II is connected with one end of the lateral part of "T"-shaped structure.

4. ultra-high frequency RFID label antenna as claimed in claim 2, is characterized in that, in the time that described echo enhancing structure is "T"-shaped structure, length range is 14mm ~ 16mm, and width range is 8mm ~ 10mm.

5. ultra-high frequency RFID label antenna as claimed in claim 2, is characterized in that, the live width of described "T"-shaped structure is greater than the live width of Part I and Part II.

6. ultra-high frequency RFID label antenna as claimed in claim 1, is characterized in that, described the first antenna body and the second antenna body are with the center of circle of loop aerial and the line mirror image symmetry of opening.

7. ultra-high frequency RFID label antenna as claimed in claim 1, is characterized in that, described Part I, Part II have S shape structure.

8. ultra-high frequency RFID label antenna as claimed in claim 1, is characterized in that, the total height of described ultrahigh-frequency tag antenna is 25.5mm ~ 27.5mm.

9. ultra-high frequency RFID label antenna as claimed in claim 1, is characterized in that, the live width scope of described Part I, Part II is 1.5mm ~ 2.5mm.

10. ultra-high frequency RFID label antenna as claimed in claim 1, is characterized in that, described opening is as label chip fixing point.