KR20120128922A - RFID tag for metal having corrosion resistance - Google Patents

Abstract

The present invention is packaged in an enclosure to minimize thermal conductivity, double wrapped with epoxy, etc. inside the RFID IC chip to withstand high temperatures, and use high-temperature silicon having high specific heat and low thermal conductivity as a heat-resistant filler, In consideration of processability and antenna gain, the lower surface of the FR4 dielectric substrate relates to an RFID tag for metal having excellent environmental resistance by using a predetermined distance away from an article of metal material.
To this end, in the RFID tag for metal, rectangular antenna patterns 2a and 2b having the largest area on the FR4 dielectric substrate 1 are formed on the FR4 dielectric substrate 1, and the rectangular antenna patterns 2a and 2b are formed. At one end, a zigzag pattern and a “?” Shaped pattern including an RFID IC chip are integrally combined.

Description

 RF tag for metal having corrosion resistance}

The present invention relates to an RFID tag for metal, and more particularly, to minimize heat conduction by packaging into an enclosure, and to wrap it with epoxy and the like inside the RFID IC chip to withstand high temperatures, and as a heat-resistant filler. The lower surface of the FR4 dielectric substrate uses high thermal silicon with high specific heat and low thermal conductivity, and in consideration of processability and antenna gain, is used to separate the RFID tag for metal having excellent environmental resistance by using a predetermined distance away from the metal material. will be.

Recently, RF (Radio Frequency IDentification) technology for automatically recognizing objects has been in the spotlight. In other words, it is called wireless recognition technology, which refers to a system that can transmit and receive various data in a wireless manner using a predetermined frequency band.

In the case of magnetic or barcode, the external marking is required, and since it is displayed on the outer surface, RFID ID tag can solve the disadvantage while the recognition rate gradually decreases over time due to damage or wear.

These RFID tags are emerging as a new solution used in various automation business, logistics, distribution, etc., for example, credit / debit card, prepaid / postpaid bus, subway card, parking card, mail delivery system, animal It is used for the history table of the.

In general, an RFID tag consists of an IC chip, an antenna, and a case in which the RFID tag is embedded. The RFID tag refers to a device capable of transmitting and receiving data with an external reader or interrogator, and is commonly referred to as a transponder.

Unlike magnetic systems used for conventional object recognition, RFID tags transmit and receive data to and from readers in a non-contact manner, and are classified into low frequency, high frequency, and UHF according to the high and low frequency used, and active tags according to the built-in battery. And manual tag.

In terms of frequency band, the low frequency band of 125KHz or 13.56Mhz has been used in the past, but in recent logistic management, the use of 900Mhz UHF (Ultra High Frequency) region has increased significantly. Passive tags are often used to manually operate on changes to generate the required current.

The size of the antenna increases as the recognition distance required by the RFID reader increases, and as the radiation power of the reader increases, the size of the antenna decreases, and decreases as the frequency used increases.

RFID tags in the frequency band of 900Mhz or more can be alleviated more antenna size and housing materials than in the tag of the frequency band below 13.56Mhz.

However, the RFID tag does not operate when metal is present between the RFID device and the antenna. In a system using inductive coupling, the magnetic flux passing through the metal plane induces a eddy current inside the metal, causing a repulsion field to block the magnetic field at the metal plane such that communication between the RFID reader and the tag is no longer possible. to be.

In order to solve this problem, conventionally, by inserting a ferrite of high permeability between the tag and the metal surface, generation of eddy currents can be suppressed. However, even when ferrite was attached, it was only 60% or less of the original performance.

The above problem occurs similarly in the RFID system of the 900Mhz band using the backscattering of electromagnetic waves. The metal contacting the antenna embedded in the RFID tag affects the impedance of the tag and prevents the tag from properly resonating at the frequency of the 900Mhz band. In addition, scattered electromagnetic waves interfere with communication between the RFID reader and the tag.

In addition, the RFID tag of the 900Mhz band that can be applied to the article of the metal material has a problem that the shape is easily deformed by the minute crack (cracks) very weak to the shock in the product with the vacuum inside.

The present invention has been proposed to solve the above problems of the prior art, the object of the present invention is to package the enclosure (packaging) to minimize the heat conduction, double wrapped in epoxy, etc. inside the RFID IC chip to withstand high temperatures As the heat-resistant filler, high-temperature silicon with high specific heat and low thermal conductivity is used, and in consideration of processability and antenna gain, the lower surface of the FR4 dielectric substrate is used at a predetermined distance away from the metal material for excellent metal resistance. It is in providing an RFID tag.

In order to achieve the above object, according to the present invention, a rectangular antenna pattern having the largest area on the FR4 dielectric substrate is formed on the FR4 dielectric substrate, and a zigzag shape and an RFID IC are formed at one end of the rectangular antenna pattern. Characterized by combining the "?" Shaped pattern including a chip is configured.

In addition, the present invention is characterized in that the lower surface of the FR4 dielectric substrate of the metal RFID tag is used at a predetermined distance from the metal material.

In addition, the present invention is characterized in that the predetermined distance is 5mm.

 According to the RFID tag for environmental metal according to the present invention made in this way, to minimize the thermal conductivity by packaging (boxing) to the enclosure, double wrapped with epoxy, etc. inside the RFID IC chip to withstand high temperatures, as a heat-resistant filler The high specific heat and low thermal conductivity of high temperature silicon, and considering the processability and antenna gain, the lower surface of the FR4 dielectric substrate is used to be separated from the metal material by a certain distance can have a very excellent environmental resistance effect. .

1 is a front perspective view of the RFID tag for environmental metal according to the present invention.
Figure 2 is a rear perspective view of the RFID tag for environmental metals according to the present invention.
Figure 3 is a vertical cross-sectional view of the RFID tag for environmental metal according to the present invention.
Figure 4 is an exemplary state of use of the RFID tag for environmental metals according to the present invention.
Fig. 5 is a block diagram of an information recognition device of RFID tag for environmental metal according to the present invention.
6A and 6B are graphs showing reflection coefficients and Smith charts optimized using a simulation tool of RFID tag for environmental metal according to the present invention.

Hereinafter, with reference to the accompanying drawings of the present invention will be described in detail.

1 is a front perspective view of an RFID tag for an environmentally friendly metal according to the present invention, FIG. 2 is a rear perspective view of an RFID tag for an environmentally friendly metal according to the present invention, and FIG. 3 is an RFID for an environmentally friendly metal according to the present invention. Figure 4 is a vertical cross-sectional view of the ID tag, Figure 4 is an exemplary view showing a state of use of the RFID tag for environmental metals according to the present invention.

As shown in Figs. 1 to 3, the RFID tag for environmentally-friendly metal 10 according to the present invention is a rectangular antenna having the largest area on the FR4 dielectric substrate 1 on the left and right sides of the RFID tag for the metal. Patterns 2a and 2b are formed, and a zigzag pattern and a “?” Shaped pattern including the RFID IC chip 3 are combined with one end of the rectangular antenna patterns 2a and 2b.

As shown in FIG. 4, the bottom surface of the FR4 dielectric substrate 1 of the metal RFID tag 10 is configured to be used at a predetermined distance from the metal material 20, and the predetermined distance is preferably 5 mm. Do.

The operation of the RFID tag for environmental metal according to the present invention configured as described above will be described in detail with reference to FIGS. 5 and 6.

First, the dielectric constant of the lossy FR4 dielectric substrate 1 is considered and the center frequency is set at 920Mhz (domestic use band is 917 ~ 923.5Mhz).

In addition, considering the gain of the antenna, rectangular antenna patterns 2a and 2b having the largest area are formed on the left and right sides of the rectangular metal RFID tag 10, and the rectangular antenna patterns 2a and 2b At one end, a zig-zag pattern and a "?" Shaped pattern including the RFID IC chip 3 are integrally combined.

As shown in FIG. 4, the lower surface of the FR4 dielectric substrate 1 of the metal RFID tag 10 is used at a predetermined distance from the metal material 20, in which case the predetermined distance is preferably 5 mm. Do.

The reason is that it is spaced apart from the dipole antenna in consideration of processability and antenna gain.

If the metal RFID tag 10 is used in contact with the metal material 20 without being spaced apart from a certain distance, scattering of electromagnetic waves may occur, thereby degrading the performance of the metal RFID tag 10. There is this.

In addition, since the metal RFID tag 10 according to the present invention is exposed to a low temperature and high temperature environment, it is a structure that requires insulation and enclosure packaging (not shown).

In particular, by enclosing the packaging to minimize the heat conduction, double wrapped in the epoxy IC chip 3, such as epoxy to withstand high temperatures.

As heat-resistant fillers, high-temperature silicon having high specific heat and low thermal conductivity is used.

In the present invention, in order to analyze the characteristics of the RFID tag antenna, the matching of the RFID IC chip 3 and the RFID tag antenna was induced using a simulation tool.

FIG. 6A shows the reflection coefficient optimized using the simulation tool, and FIG. 6B shows the Smith chart optimized using the simulation tool.

To illustrate the size and characteristics of the environmentally-resistant RFID tag 10 for metal according to the present invention is shown in Table 1.

division Environmental tag Tag size 97 × 17 mm or less Recognition distance 6m Immunity temperature -45? 240 ℃

In addition, the impedance measurement value of the RFID IC chip 3 according to the present invention is shown in Table 2 below.

division
Sample # 1 Sample # 2 Sample # 3 Sample # 4 Sample # 5 medium Center frequency (920Mhz) 26-j164 27-j163 25-j165 24-j162 25-j164 26-j163

Figure 5 is a block diagram of the information recognition device of the RFID tag for environmental metals related to the present invention, as shown in the metal material 20 to be used at a predetermined distance (5mm) away from the metal material 20 Recognition related information of the metal material 20 stored in the RFID IC chip 3 included in the RFID tag 10 passes through an antenna pattern formed on the front surface of the metal RFID tag 10. When received by the RFID reader 40 through the antenna 30 provided in the), the RFID reader 40 transmits various related information of the metal material article 20 transmitted from the metal RFID tag 10. LAN) to the computer 50,

Accordingly, the computer 50 may provide various related information services required for the metal article 20 to the user through an output device such as a monitor as compared with a previously stored database.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention.

Therefore, the technical scope of the present invention should not be limited to the contents described in the embodiments, but should be defined by the claims and their equivalents.

1: FR4 dielectric substrate 2a, 2b: rectangular antenna pattern
3: RFID IC chip 10: RFID tag for metal
20: metal material 30: RFID reader antenna
40: RFID reader 50: computer

Claims (3)

In RFID tag for metal,
On the FR4 dielectric substrate 1, rectangular antenna patterns 2a and 2b having the largest area are formed on the left and right sides, and a zigzag shape and an RFID IC chip are formed at one end of the rectangular antenna patterns 2a and 2b. RFID tag for environmental metals, characterized in that the "?" Shaped pattern is integrally combined. The method of claim 1,
The lower surface of the FR4 dielectric substrate (1) of the RFID tag for metal is an RFID tag for environmental metals, characterized in that used at a predetermined distance away from the metal material (20). The method of claim 2,
The predetermined distance is 5mm RFID tag for environmental metals, characterized in that.

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