TWI415004B - Wireless identification tag for use in metal plates - Google Patents

Abstract

A wireless identification label used for a metal plate includes a main body, a wireless identification chip and an antenna. The wireless identification label is adhered to a side face of a metal plate or an inner side face of a steel roll. Moreover, by means of mutually associating the main body with the antenna, the antenna has the same electromagnetic field distribution property as a vertical slot antenna does, such that the wireless identification label is made to have the smallest interference received from the metal plate after being electrically connected to the wireless identification chip, and to have an induction direction located on the two sides of the long direction. Furthermore, by means of simple improved means, the reading distance and bandwidth can be increased; and the thickness of the wireless identification label is thinner than the minimal standard thickness of 5mm for a general metal plate, thereby being able to be adhered to the side of the metal plate, so that the application towards the metal-plate products already achieves the requirement of practical uses, and therefore can exactly achieve the purpose of the present invention.

Description

Wireless identification tag for metal plates

The present invention relates to a wireless identification tag, and more particularly to a wireless identification tag for use in a metal plate.

The main purpose of the antenna is to transmit and receive electromagnetic waves, and the information to be transmitted can be modulated into electromagnetic waves to achieve the function of information transmission and communication. Due to the maturity of Radio Frequency Identification (RFID) technology in recent years, a large amount of data can be stored in an RFID chip, and a remote data exchange is performed through the antenna and the reading system. An RFID tag is composed of two components, an RFID chip that stores data and an antenna that transmits and receives electromagnetic waves. Since the metal can be regarded as a good conductor and a perfect reflection surface for electromagnetic waves, attaching the RFID tag to the surface of the metal plate often causes interference of the signal, so that the electromagnetic wave cannot be effectively received and emitted, so that the reading distance is made. It is reduced by 1 to 2 cm from a few meters.

In order to overcome this problem, some RFID manufacturers add a layer of plastic, wood gasket or electromagnetic wave absorber between the label and the metal plate, which will reduce the metal interference. In addition, according to the characteristics of the electromagnetic field distribution of the loop antenna, it is also possible to overcome the metal interference by erecting a loop antenna to the metal surface.

Since the metal plates need to be stacked several pieces of metal during transportation, the RFID tag can only be attached to the side of the metal plate. Since the thickness of the metal plate is at least 5 mm, which limits the allowable area of the RFID tag, the RFID antennas in the literature or on the market cannot be applied to the metal plate, so that the steel mills all over the world cannot yet give Metal plate number.

In addition, the industry has proposed to use a vertical loop antenna to cooperate with an RFID tag to produce a wireless identification tag that can be applied to metal objects (for example, National Patent No. 267788), although the reading distance is Progressive, but after electric field pattern analysis, the electric field generated by the vertical loop antenna is perpendicular to a surface to which the wireless identification tag is attached, that is, the sensing direction is also perpendicular to the surface, and this is The characteristics still have many limitations in the application to the metal industry.

As described above, when the wireless identification tag is used on a steel coil or a bundled metal wire product, the wireless identification is generally used in order to reduce the complexity of the installation and the damage caused by the external force collision friction. The label is placed on the inner side of the steel coil or bundled metal wire, and this arrangement plus the aforementioned sensing direction perpendicular to the mounting surface must be matched with an induction that can extend into the inside of the coil or coil. The arm can operate successfully, resulting in considerable inconvenience in reading. Therefore, such a loop antenna type wireless identification tag still has a lot of room for improvement.

Accordingly, it is an object of the present invention to provide a wireless identification tag that is directly attached to a metal plate but is not easily disturbed by the metal plate, and whose sensing direction is not limited to a perpendicular identification surface.

Therefore, the wireless identification tag for the metal plate of the present invention comprises a body, an antenna, and a wireless identification chip.

The body is made of a dielectric substance. The antenna has a first branch and a second branch attached to opposite sides of the body, and a third branch spaced apart from each other and interconnecting the first branch and the second branch respectively A fourth branch.

The wireless identification chip has a first contact portion and a second contact portion electrically connected to the outside, the first contact portion is electrically connected to the first leg of the antenna, and the second contact portion is connected to the antenna The second segment is electrically connected, and when the wireless identification chip is in operation, a first contact portion, the first branch portion, the third branch portion, the second branch portion, and the Forming a current loop in the second contact portion, and sequentially forming another current through the first contact portion, the first branch portion, the fourth branch portion, the second branch portion, and the second contact portion The circuit, and thus the wireless identification chip, the first leg, the second leg, the third leg, and the fourth leg cooperate to form a two current loop.

The effect of the present invention is to support the antenna on the metal plate by using the body, and the antenna is perpendicular to the metal plate by the unique configuration of the antenna and the electrical connection with the wireless identification chip. Slot antenna-like operation, and the unique electromagnetic field distribution of such a slot antenna perpendicular to the metal plate can reduce the interference of the metal plate on electromagnetic wave transmission, and the sensing direction is on both sides of the wireless identification chip. The wireless identification wafer can be used not only on a metal plate but also in a steel coil or bundled metal wire and operate smoothly.

The above and other technical contents, features and advantages of the present invention will be apparent from the following detailed description of the preferred embodiments of the invention.

Before the present invention is described in detail, it is noted that in the following description, like elements are denoted by the same reference numerals.

As shown in FIG. 1 and FIG. 2, the first preferred embodiment of the wireless identification tag of the present invention is disposed on a metal plate 5. The wireless identification tag 4 includes a body 1 and an antenna 2, and A wireless identification chip 3 embedded in the body 1. In this embodiment, the metal plate 5 is a steel plate.

The body 1 is in the form of a narrow rectangular thin plate and is made of a dielectric substance. The dielectric material is glass substrate FR4 (dielectric constant 4.4), but it can also be composed of other dielectric materials, depending on the actual application, and how to select the appropriate dielectric material is known to those who have common knowledge of the art. Therefore, it is not described.

The antenna 2 has a first branch 21 and a second branch 22 attached to opposite sides of the body 1 and spaced apart from each other and interconnecting the first branch 21 and the second branch 22 respectively. A third branch 23 and a fourth branch 24.

The wireless identification crystal 3 has a first contact portion 31 and a second contact portion 32 electrically connected to the outside, and the first contact portion 31 is electrically connected to the first branch 21 of the antenna 2, and the first The second contact portion 32 is electrically connected to the second branch 22 of the antenna 2. When the wireless identification chip 3 is in operation, a first contact portion 31, the first branch portion 21, and the The third branch 23, the second branch 22, and the second contact portion 32 form a current loop, and sequentially pass through the first contact portion 31, the first branch portion 21, and the fourth branch portion. 24. The second branch 22 and the second contact portion 32 form another current loop, thereby making the wireless identification chip 3, the first branch 21, the second branch 22, and the third branch 23, and the fourth branch 24 cooperate with each other to form two current loops as indicated by the arrows in FIG. In this embodiment, the material of the antenna 2 is a thin copper piece, but other electrically conductive metals may also be used, so it should not be limited to the description of the embodiment.

As shown in FIG. 3, when the wireless identification chip 3 receives electromagnetic waves and is energized, the electric field generated after the power is applied to the wireless identification chip 3 is distributed on the long sides of the wireless identification tag 4, that is, the sensing can be detected. The direction is the long side of the wireless identification tag 4, and the sensing direction of the conventional product is limited to the direction perpendicular to the mounting surface thereof, and the application range of the present invention in the installation configuration direction is Know more. For example, as shown in FIG. 4, when the wireless identification tag 4 is to be mounted on a steel coil 6 (wound thin metal plate 5), the sensing direction can be utilized in the long direction. The side feature directly adheres to the inner side of the coil 6 adjacent to the opening, and the detecting receiver (not shown) does not need to be inserted into the coil 6 as is conventionally received. The message sent by the wireless identification tag 4 is beneficial to the overall design planning of the logistics control, and even the introduction of fully automated logistics.

In order to increase the reading distance, the wireless identification chip 3 must perform more efficient energy exchange with the antenna 2, and when the impedance properties of the two reach a conjugate complex match, the energy conversion efficiency can be achieved. optimization. Generally, when the antenna 2 is designed, impedance matching can be achieved by modifying the size and partial structure of the antenna 2. The antenna 2 formed by the arrangement described in this embodiment has the same current distribution as that of the general slot antenna 2, and the electric field generated by it is also the same as that of the slot antenna 2 having vertical slots. Generally, the imaginary impedance of the RFID chip is about 5 to 10 times that of the real part. Therefore, the antenna 2 can be impedance-matched by the modification of its own size, for example, the size of the wireless identification tag 4 disclosed in this embodiment. It is 82mm x 5mm x 3.2mm and can reach a reading distance of 60-70cm or more when placed on the side of the 8mm thick metal plate 5.

It should be noted that, if necessary, the wireless identification chip 3 can be connected in series with a capacitor or an inductor (not shown) to achieve impedance matching.

As shown in FIG. 5, the second preferred embodiment of the wireless identification tag used in the metal plate of the present invention is substantially the same as the first preferred embodiment, and the similarities are no longer in common, wherein the difference is that The main body 1 has a first base portion 11 in the shape of a narrow rectangular thin plate, an intermediate portion 12 extending from the first base portion 11 away from the first base portion 11, and a middle portion 12 disposed away from the first portion A second base portion 13 of one of the base portions 11 and also having a narrow rectangular thin plate shape is embedded in the middle portion 12 of the body 1.

The configuration of the antenna 2 disclosed in this embodiment is equivalent to the dual-slot antenna 2 of the upright position. The shortcoming of the slot antenna 2 is that the bandwidth is narrow, and the bandwidth can be increased by the structure of the double slot. A double resonant frequency is achieved and thereby the bandwidth is increased.

As shown in FIG. 6 and FIG. 7, the third preferred embodiment of the wireless identification tag used in the metal plate of the present invention is substantially the same as the first preferred embodiment, and the similarities are no longer in common, and the difference is not the same. The first body 21 is formed with a first perforation 14 through which a second perforation 211 is formed. When the antenna 2 is circumferentially adhered to the outer periphery of the body 1 The second perforating hole 211 overlaps and communicates with the first perforating hole 14 . The wireless identification chip 3 is disposed on the antenna 2 and has the first branch 21, and the first contact portion of the wireless identification chip 3 is electrically connected to the first branch 21 having the second cutout 211. The second contact portion is electrically connected to the second branch 22 of the antenna 2 through the first and second holes 14 and 211.

This embodiment is similar in efficiency to the first preferred embodiment, but the advantage of this embodiment is that the first boring hole 14 formed on the body 1 and the second boring hole 211 formed on the antenna 2 are utilized. The wireless identification chip 3 can be electrically connected to the first and second branches 21, 22 by the first and second holes 14, 211, thereby eliminating the need for an embedded feed mode. The identification chip 3 can be directly attached to the antenna 2. The feeding method of the wireless identification chip 3 is simpler than the embedded method, and the manufacturing cost is saved.

As shown in FIGS. 8 and 9, the fourth preferred embodiment of the wireless identification tag of the present invention for use in a metal plate is substantially the same as the first preferred embodiment, and the same is no longer a common one, and the difference is not the same. The main body 1 is formed in a narrow rectangular shape, and the body 1 is formed with a first perforation 14 and two third perforations 15 . The first leg 21 of the antenna 2 is formed with a through hole. The second perforating hole 211 is overlapped and communicated with the first perforating hole 14 when the antenna 2 is attached to the main body 1. The wireless identification chip 3 is disposed on the antenna 2 The first branch portion 21 of the second identification hole 211 is electrically connected to the first branch portion 21 of the antenna 2 having the second perforation 211, and The second contact portion 32 is electrically connected to the second branch 22 of the antenna 2 through the first perforating hole 14 and the second perforating hole 211. The third branch 23 of the antenna 2 and the first portion The four segments 24 are electrically connected to the second branch 22 through the third holes 15 respectively.

The present embodiment is the same as the first preferred embodiment in terms of efficiency, but the advantage of this embodiment is that the first perforating hole 14 formed on the body 1 and the third perforating holes 15 are formed and formed on The second hole 211 on the antenna 2 enables the wireless identification chip 3 to be electrically connected to the first and second branches 21, 22 by the first and second holes 14, 211, respectively, and The third branch 23 and the fourth branch 24 of the antenna 2 can electrically connect the first branch 21 and the second branch 22 respectively through the third holes 15, thereby eliminating the need for embedding. The feeding mode is such that the wireless identification chip 3 can be directly attached to the antenna 2. The feeding method of the wireless identification chip 3 is simpler than the embedded method, thereby saving manufacturing cost. .

In summary, the wireless identification tag used in the metal plate of the present invention uses the antenna 2 to cooperate with the body 1 to design a vertical slot antenna 2 to minimize interference from the metal plate 5, and then simply The improved means can achieve impedance matching with the wireless identification chip 3 and increase its maximum reading distance and bandwidth, and the thickness of the wireless identification tag 4 is thinner than the minimum standard thickness of the metal plate 5 by 5 mm, so that it can be pasted. On the side of the metal plate 5, the application of the metal plate 5 product has reached the practical requirements, so the object of the present invention can be achieved.

The above is only the preferred embodiment of the present invention, and the scope of the invention is not limited thereto, that is, the simple equivalent changes and modifications made by the scope of the invention and the description of the invention are All remain within the scope of the invention patent.

1. . . Ontology

11. . . First base

12. . . Middle section

13. . . Second base

14. . . First hole

15. . . Third hole

2. . . antenna

twenty one. . . First segment

211. . . Second hole

twenty two. . . Second branch

twenty three. . . Third branch

twenty four. . . Fourth branch

3. . . Wireless identification chip

31. . . First contact

32. . . Second contact

4. . . Wireless identification tag

5. . . Metal plate

6. . . Steel coil

1 is a cross-sectional view showing a first preferred embodiment of a wireless identification tag for use in a metal plate of the present invention; and FIG. 2 is a perspective view showing the first preferred embodiment mounted on a metal plate; 3 is an electric field distribution diagram illustrating the electric field distribution of the first preferred embodiment during operation; and FIG. 4 is a front view showing the first preferred embodiment mounted on a steel coil; FIG. Figure 2 is a cross-sectional view showing a second preferred embodiment of the wireless identification tag of the present invention for use in a metal plate; Figure 6 is a plan view showing a third preferred embodiment of the wireless identification tag of the present invention for use in a metal plate; Is a cross-sectional view showing the configuration of the third preferred embodiment; FIG. 8 is a plan view showing a fourth preferred embodiment of the wireless identification tag used in the metal plate of the present invention; and FIG. 9 is a cross-sectional view showing the first The construction of the four preferred embodiments.

1. . . Ontology

2. . . antenna

twenty one. . . First segment

twenty two. . . Second branch

twenty three. . . Third branch

twenty four. . . Fourth branch

3. . . Wireless identification chip

31. . . First contact

32. . . Second contact

4. . . Wireless identification tag

Claims (5)

A wireless identification tag for use in a metal plate, disposed on a metal plate, comprising: a body made of a dielectric material, the body having a first base portion in the form of a narrow rectangular thin plate, and a first base portion a middle portion extending away from the first base portion, and a second base portion disposed on the middle portion away from the first base portion and also having a narrow rectangular thin plate shape; an antenna having a second attached to the body a first branch and a second branch of the opposite side, and a third branch and a fourth branch which are spaced apart from each other and respectively connect the first branch and the second branch; and a wireless identification The chip is embedded in the middle portion of the body, and has a first contact portion and a second contact portion electrically connected to the outside, the first contact portion is electrically connected to the first leg of the antenna, and the second portion The contact portion is electrically connected to the second branch of the antenna. When the wireless identification chip is in operation, a first contact portion, the first branch portion, the third branch portion, and the first a second branch, and the second contact portion forms a current back And sequentially forming another current loop through the first contact portion, the first branch portion, the fourth branch portion, the second branch portion, and the second contact portion, thereby further causing the wireless identification chip, The first branch, the second branch, the third branch, and the fourth branch form a two current loop in cooperation with each other. A wireless identification tag for a metal plate, disposed on a metal plate, comprising: a body made of a dielectric material, wherein the body has a narrow length Forming a thin plate shape, and the body is formed with a first perforation hole therethrough; an antenna having a first branch and a second branch attached to opposite sides of the body, and spaced apart and respectively respectively a third branch and a fourth branch connected to each other by a segment and a second branch, a first through hole is formed in the first branch of the antenna, and the antenna is attached to the outer circumference of the body The second hole is overlapped and communicated with the first hole; and a wireless identification chip is disposed on the first leg of the antenna having the second hole, and The first contact portion of the wireless identification chip is electrically connected to the first leg of the antenna having the second perforation, and the second contact portion extends through the first perforation and the second perforation Electrically connecting with the second branch of the antenna, when the wireless identification chip is in operation, forming a first contact portion, the first branch portion, the third branch portion, and the second branch portion And forming a current loop in the second contact portion, and sequentially passing the first contact portion, the first branch The fourth branch, the second branch, and the second contact portion form another current loop, thereby causing the wireless identification chip, the first branch, the second branch, and the third branch And the fourth branch cooperates to form a two current loop. A wireless identification tag for use in a metal plate according to claim 2, wherein the body is further formed with two third holes spaced apart from the first hole, the third branch of the antenna The fourth branch electrically conductively connects the first branch and the second branch through the third boring holes. A wireless identification tag for use in a metal plate according to claim 1, 2 or 3, wherein the wireless identification chip further has a capacitor electrically connected thereto. A wireless identification tag for use in a metal plate according to claim 1, 2 or 3, wherein the wireless identification chip further has an inductance electrically connected thereto.