WO2016197605A1

WO2016197605A1 - Rfid tag

Info

Publication number: WO2016197605A1
Application number: PCT/CN2016/071022
Authority: WO
Inventors: 田艺儿
Original assignee: 田艺儿
Priority date: 2015-06-11
Filing date: 2016-01-15
Publication date: 2016-12-15
Also published as: CN204834834U

Abstract

An insertion RFID tag, comprising a substrate (6) and an insertion RFID tag antenna provided on the substrate (6), wherein the tag antenna comprises a first antenna (1) and a second antenna (2); the distance between the first antenna (1) and the second antenna (2) can be adjusted in an extendible manner; a dielectric plate (4) is provided on the second antenna (2), a tag chip (5) is provided on the dielectric plate (4), and the tag chip (5) is electrically connected to the antenna; an elongated isolation slot (17) is provided on the first antenna (1); and a frequency raising notch (18) is provided on the second antenna (2) and the first antenna (1). The reading distance of the RFID tag is long, and upon testing, the reading distance thereof can be up to 11-13 m; and the tag can be extended, i.e. the length can be adjusted, and can be used on pair packages with a basically fixed width but an uncertain length, has a great practical value, is good in various antenna performances, small in standing wave ratio, low in return loss and high in gain and is omnidirectional.

Description

RFID tag

Technical field

The utility model relates to an RFID tag.

Background technique

Currently, RFID (Radio Frequency Identification) technology, also known as electronic tag, radio frequency identification, is a type of radio signal that can identify a specific target and read and write related data without identifying the system and establishing a mechanical or specific target. Optical contact communication technology. Commonly used passive RFIDs have low frequency (125k ~ 134.2K), high frequency (13.56Mhz), ultra high frequency (860-960MHz). As an important part of the RFID system, the RFID tag antenna will greatly affect the efficiency and quality of the entire RFID system. The main factors affecting the performance of RFID antennas include antenna size, operating frequency band, impedance and gain. Commonly used RFID antennas often use a bent line dipole form, which is convenient for reducing antenna size and antenna processing. This type of antenna pattern is perpendicular to the antenna surface, so it is attached to the vertical outer surface of the target object when used; when the length of the object changes, the antenna is required to change, and the gain also changes, so it needs to be designed. An antenna that can change according to the length, in addition, its antenna performance also needs to meet the requirements.

Utility model content

The purpose of the present invention is to overcome the above disadvantages and to provide an RFID tag.

In order to achieve the above object, a specific solution of the present invention is as follows: a substrate, and a plug-in RFID tag antenna disposed on the substrate, wherein the second antenna is provided with a dielectric plate, and the media plate is provided with a label chip, the label The chip is electrically connected to the antenna;

The tag antenna includes a first antenna and a second antenna, and a distance between the first antenna and the second antenna is telescopically adjustable.

The first antenna includes an elongated first body, one end of the first body is provided with a first gain rod, and the free end of the first gain rod is provided with an arc-shaped first gain antenna, and two a coupling groove, the two coupling groove openings are opposite to the other end of the first body, the two coupling grooves are disposed in parallel in the first body, and the upper and lower sides of each coupling groove are provided with serrated zigzag grooves; The second antenna includes a second body, the first body has a length greater than the second body, the second body has a second gain rod at one end thereof, and the second end of the second gain rod is provided with an arc-shaped portion The second gain antenna further includes two coupling strips disposed on the other end of the second body, and the two coupling strips are disposed in parallel. The upper and lower sides of each of the coupling strips are provided with the serration slots. a serrated zigzag protrusion, the serration protrusion being located in the serration groove when mated;

The utility model further includes a T-shaped adjusting rod, wherein the second body is provided with an opening corresponding to the opening of the first body, and the horizontal section of the T-shaped adjusting rod is located in the adjusting recess;

The distance between the free end of the coupling strip and the inner side of the coupling groove is L, and the horizontal distance between the free end of the horizontal section of the T-shaped adjustment rod and the inner side of the adjustment recess is M, and the L=M*3.75.

Wherein, one end of the first body is an arc surface, and the arc is the same as the arc of the first gain antenna.

Wherein, one end of the second body is a curved surface, and the arc is the same as the arc of the second gain antenna.

Wherein the first gain antenna and the second gain antenna have the same arc, both being 60° -80°.

Wherein, a side of the first gain antenna is further provided with a third gain rod, and a free end of the third gain rod is provided with a third gain antenna.

The arc of the third gain rod is the same as the arc of the first gain rod.

Wherein the height of the first body is less than 10 cm.

Wherein, the first antenna is provided with an elongated isolation groove.

The second antenna and the first antenna are provided with a frequency increase gap.

The utility model has the following advantages: 1. The reading distance is long, and the reading distance can be 11-13 m after being tested. The reading distance of ordinary RFID tag antennas is less than 10m. 2, stretchable; that is, the length is adjustable, it can be used for a package with a certain width, but the length is not fixed, has great practical value. 3. Various antennas have good performance, small standing wave ratio, low return loss, high gain and omnidirectionality. It has higher performance when used at a frequency of ultra high frequency (860-960 MHz), especially around 925 MHz.

DRAWINGS

1 is a schematic view of a tag antenna of the present invention;

2 is a schematic view of the tag antenna of the present invention after being elongated;

3 is a schematic diagram of a first antenna of the present invention;

4 is a schematic diagram of a second antenna of the present invention;

Figure 5 is a schematic view of the utility model;

6 is a graph of impedance test data of the present invention;

7 is a graph of return loss test data of the present invention;

Figure 8 is a directional test data diagram of the present invention;

The reference numerals in Figures 1 to 8 illustrate:

1. First antenna; 11, coupling slot; 12, sawtooth slot; 13, first gain lever; 14, first gain antenna; 15, third gain lever; 16, third gain antenna; , frequency increase gap;

2, a second antenna; 21, a coupling strip; 22, a serrated protrusion; 23, a second gain rod; 24, a second gain antenna; 25, an adjustment recess;

3. T-shaped adjustment rod;

4, the dielectric board;

5, the tag chip;

6, the substrate.

detailed description

The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments, which are not intended to limit the scope of the invention.

As shown in FIG. 1 to FIG. 8 , a plug-in RFID tag antenna according to this embodiment includes a first antenna 1 and a second antenna 2, and the distance between the first antenna 1 and the second antenna 2 can be Telescopic adjustment. The RFID tag manufactured by the same comprises a substrate 6 and a plug-in RFID tag antenna disposed on the substrate 6. The second antenna 2 is provided with a dielectric plate 4, and the dielectric plate 4 is provided with a tag chip 5, the tag chip 5 Electrically connected to the antenna.

The first antenna 1 includes an elongated first body, and one end of the first body is provided with a first gain rod 13 for the first gain rod 13 The free end is provided with an arc-shaped first gain antenna 14 and further includes two coupling slots 11 opening toward the other end of the first body, the two The coupling grooves 11 are disposed in parallel in the first body, and the upper and lower sides of each of the coupling grooves 11 are provided with a serrated zigzag groove 12; the second antenna 2 includes a second body, the length of the first body The second body is provided with a second gain rod 23, the second end of the second gain rod 23 is provided with a curved second gain antenna 24, and two of the second body are disposed on the second body. The coupling strips 21 are engaged with the coupling grooves 11 at one end, and the two coupling strips 21 are disposed in parallel. The upper and lower sides of each of the coupling strips 21 are provided with serrated serrations 22 matched with the serrations 12. The sawtooth protrusion 22 is located in the sawtooth slot 12; a plug-in RFID tag antenna according to this embodiment further includes a T-shaped adjustment rod 3, and the second body is provided with an opening facing the first body The adjustment recess 25, the horizontal section of the T-shaped adjustment rod 3 is located in the adjustment recess 25; a plug-in RFID tag antenna according to the embodiment, the free end of the coupling strip 21 and the inside of the coupling slot 11 The distance inside is L, and the free end of the horizontal section of the T-shaped adjustment rod 3 is adjusted. The horizontal distance inside the inside of the notch 25 is M, and the L = M * 3.75.

The program achieves a long reading distance by the above features, and the reading distance can be 11-13 m after testing. The reading distance of ordinary RFID tag antennas is less than 10m. In addition, it can be stretched; that is, the length is adjustable, and it can be used for a package having a substantially constant width, but the length is not fixed, and has great use value, and is attached on different packages, and in addition, theoretically, it can grow indefinitely. Finally, its antenna performance is good, the standing wave ratio is small, the return loss is low, the gain is high, and it is omnidirectional.

It has higher performance when used at frequencies around 925 MHz. In the plug-in RFID tag antenna of the embodiment, one end of the first body is a curved surface, and the arc is the same as the arc of the first gain antenna 14. This setting further improves the gain performance and reduces Low return loss, increased radiation omnidirectionality, and better optimization results. In the plug-in RFID tag antenna of the embodiment, one end of the second body is a curved surface, and the arc is the same as the arc of the second gain antenna 24. The same arc can reduce the formation of standing waves between the two antennas, reduce wave interference, and reduce the standing wave ratio. In the plug-in RFID tag antenna of the embodiment, the first gain antenna 14 and the second gain antenna 24 have the same arc, both of which are 60°-80°.

Through the simulation and actual experiments, the performance of the radian antenna is the best.

A plug-in RFID tag antenna according to this embodiment, a third gain lever 15 is further disposed on one side of the first gain antenna 14, and a third gain antenna 16 is disposed on a free end of the third gain lever 15 In the plug-in RFID tag antenna of the embodiment, the arc of the third gain lever 15 is the same as the arc of the first gain bar 13; similarly, the setting is further improved, and the gain performance is further reduced. Wave loss increases the omnidirectionality of the radiation and the optimization result is better.

In the embodiment of the present invention, a plug-in RFID tag antenna has a height of the first body of less than 10 cm. In the embodiment, the first antenna 1 is provided with an elongated isolation slot 17 , and the isolation slot 17 is located between the two coupling slots 11 , which is described in this embodiment. A plug-in RFID tag antenna is provided, and the second antenna 2 is provided at two corners of one side of the first antenna 1 and at two corners of a side of the first antenna 1 close to the second antenna 2, and a boosting notch 18 is provided. The up-sampling gap 18 increases the isolation and reduces the formation of standing waves, making the standing wave ratio close to one. The antenna of this scheme also has a good performance in terms of omnidirectionality. As shown in Fig. 8, it has excellent performance in omnidirectionality and has a 360 degree dead angle equidistance omnidirectionality. As shown in Figure 7, its return loss performance is outstanding, especially at 925MHz, the minimum return loss is -65dB, and the return loss is maintained at -10dB throughout the high frequency range. The average level is higher than other similar antenna levels.

According to the test, the effective distance is 11-13m under different tensile lengths.

In addition, the input impedance of the antenna test is shown in Fig. 6. The measured impedance is 11+144j ohms at 925MHz, which is conjugate matched with the impedance 11+143j of the chip Monza4Dura. The label achieves optimal results at 925MHz.

The above description is only a preferred embodiment of the present invention, and equivalent changes or modifications made to the structures, features and principles described in the scope of the present patent application are included in the protection of the present patent application. Within the scope.

Claims

An RFID tag, comprising: a substrate (6), and a plug-in RFID tag antenna disposed on the substrate (6), the tag antenna comprising a first antenna (1) and a second antenna (2), The distance between the first antenna (1) and the second antenna (2) is telescopically adjustable; the second antenna (2) is provided with a dielectric plate (4), and the dielectric plate (4) is provided with a label chip ( 5) The tag chip (5) is electrically connected to the antenna;

The first antenna (1) is provided with an elongated isolation groove (17);

An increased frequency gap (18) is disposed on the second antenna (2) and the first antenna (1).
The RFID tag according to claim 1, wherein the first antenna (1) comprises an elongated first body, and one end of the first body is provided with a first gain rod (13), The free end of the first gain rod (13) is provided with an arc-shaped first gain antenna (14), and further comprises two coupling grooves (11), the two coupling grooves (11) opening toward the first body One end, the two coupling grooves (11) are disposed in parallel in the first body, and the upper and lower sides of each coupling groove (11) are provided with serrated zigzag grooves (12); the second antenna (2) Included is a second body having a length greater than the second body, one end of the second body is provided with a second gain rod (23), and the free end of the second gain rod (23) is provided with an arc The second gain antenna (24) further includes two coupling strips (21) disposed at the other end of the second body and engaging with the coupling grooves (11), the two coupling strips (21) are arranged in parallel, Each of the upper and lower sides of each coupling strip (21) is provided with a serrated serration (22) that cooperates with the serration groove (12). When mated, the serration (22) is located in the serration groove (12);

A T-shaped adjustment rod (3) is further included, and the second body is provided with an opening toward the first a regulating recess (25) of the body, the horizontal section of the T-shaped adjusting rod (3) is located in the adjusting recess (25);

The distance between the free end of the coupling strip (21) and the inner side of the coupling groove (11) is L, and the horizontal distance between the free end of the horizontal section of the T-shaped adjustment rod (3) and the inner side of the adjustment recess (25) is set. For M, the L = M * 3.75.
The RFID tag according to claim 2, wherein one end of the first body is a curved surface and the arc is the same as the arc of the first gain antenna (14).
The RFID tag according to claim 2, wherein one end of the second body is a curved surface and the arc is the same as the arc of the second gain antenna (24).
The RFID tag according to claim 2, wherein the first gain antenna (14) and the second gain antenna (24) have the same arc, both of which are 60°-80°.
The RFID tag according to claim 2, characterized in that: one side of the first gain antenna (14) is further provided with a third gain lever (15), and the third gain lever (15) is free. A third gain antenna (16) is provided at the end.
An RFID tag according to claim 6, characterized in that the arc of the third gain lever (15) is the same as the arc of the first gain lever (13).
An RFID tag according to claim 2, wherein said first body has a height of less than 10 cm.