KR100747508B1 - A system including the RF ID TA and its RF ID TA which can be recognized bidirectionally - Google Patents

Abstract

The present invention relates to an RFID TAG capable of bidirectional recognition and a system including the RFID TAG, and in particular, by installing a memory chip connected to an antenna on both sides of a non-contact RFID TAG, thereby minimizing the influence on the surrounding environment, Wireless communication can be performed in both directions with respect to the reader.

RFID, TAG, Reader, Contactless, Ferrite

Description

RDF ID and system that can recognize bidirectional recognition and its RFID {{RFID TAG RECOGNIZABLE WITH BOTH SIDES AND SYSTEM COMPRISING THE RFID TAG}

1 is a plan view of a general RFID TAG.

2 is a diagram illustrating an RFID TAG according to the prior art.

3 is a diagram illustrating an RFID TAG 100 according to an embodiment of the present invention.

4 is a diagram illustrating a system including an RFID TAG according to an embodiment of the present invention.

The present invention relates to an RFID TAG capable of bidirectional recognition and a system including the RFID TAG.

Credit cards, cash cards, and debit cards, which are currently used a lot, use simple information stored on the magnetic lines on the back of the cards. However, magnetic cards have a limited amount of information that can be stored, and if they are exposed to strong magnetic fields in everyday life, they are not only easily damaged but also have no security.

Recently, an authentication method using radio frequency identification (RFID) has been widely used to overcome this disadvantage.

RFID refers to a technology for identifying an object (article, user, etc.) using a radio frequency (RF). In general, RFID TAG is composed of a memory chip consisting of an antenna and a semiconductor for communication with the reader. Since RFID TAG can store and use not only product information but also personal information in memory, it can be used for various fields such as access management, method system, electronic money, as well as simple article management.

In general, the RFID TAG 100 includes a memory chip 112 and an antenna 114 as shown in FIG. Here, the memory chip 112 stores information for identifying the ID, and the antenna 114 receives the radio wave transmitted from the reader and transmits the radio wave including the information stored in the memory 112 back to the reader 114. do.

On the other hand, depending on how the data is read in the RFID TAG may be divided into contact and contactless. In the case of the contact type, the RFID TAG can be used by tagging the reader, and the input and output process of the information is performed along with the voltage supply required to drive the direct circuit in the memory chip through the contact surface of the TAG. On the other hand, in the case of the non-contact type, the reader can read the contents of the memory chip when it comes within a certain distance from the reader, and since the voltage cannot be supplied from the outside, the induction current using the coil embedded in the RFID TAG is used.

In addition, RFID TAG is divided into ACTIVE type that stores power in TAG according to the position of power and PASSIVE type that receives RF power from external reader and uses it as power.

Like most RFID-enabled products, RFID TAGs are sensitive to the environment. In particular, in the case of PASSIVE type, since there is no internal power supply inside the RFID TAG, it is very important to design an antenna that plays a role of obtaining power through radio waves from the reader, and the READ RANGE decreases significantly when the environment around the antenna changes. Occurs.

In order to overcome such a problem, conventionally, a conductive substrate 130 such as iron is stacked on the rear surface of the RFID TAG 100 as shown in FIG. 2, and includes a front substrate including a memory chip 112 and an antenna 114. A non-conductive material 120 made of an insulator or interface space is inserted between the 110 and the conductive material 130. Therefore, even if the RFID TAG is attached to a steel plate or a human body or an object, the non-conductive material 120 fixes the impedance component generated by the conductive material 130 on the rear side, so that the front side maintains the original read range. do.

However, as shown in FIG. 2, since the antenna 114 and the memory chip 112 are built in only one side of the conventional RFID TAG 100, the reader 300 installed in front of the antenna 114 and the wireless device are wirelessly connected. Since communication is possible, when the rear surface of the RFID TAG is facing the reader, there is a problem that wireless communication with the reader cannot be performed properly.

Accordingly, the present invention has been made in an effort to solve the above-described problems, and to provide a system including an RFID TAG and a RFID TAG that can recognize a radio wave output from a reader in both directions.

According to one aspect of the present invention for achieving the above object, there is provided an RFID TAG that performs authentication through wireless communication with the reader when approaching an external reader. The RFID TAG includes: a fixing member formed by stacking non-conductive materials on both sides of a planar conductive material; A first memory chip mounted on a first surface of the fixing member and storing a first ID; A second memory chip mounted on a second surface of the fixing member and storing a second ID; A first antenna connected to the first memory chip and having a first resonant frequency; It is connected to the second memory chip, and includes a second antenna having a second resonance frequency.

According to another feature of the invention, an RFID system is provided. The RFID system includes: an RFID TAG that mounts a first memory chip storing a first ID and a second memory chip storing a second ID on both sides of a fixing member, respectively; A reader for wireless communication with a first antenna and a second antenna connected to the first and second memory chips when the RFID TAG is in proximity; And a controller for transmitting the information input to the reader to an external device by comparing the first ID and the second ID stored in the first and second memory chips.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention. Like parts are designated by like reference numerals throughout the specification.

An RFID TAG capable of bidirectional recognition according to an embodiment of the present invention will now be described in detail with reference to the accompanying drawings.

3 is a diagram illustrating an RFID TAG 200 according to an embodiment of the present invention. Referring to FIG. 3, the first substrate 210 and the second substrate 230 are stacked with the main substrate 220 interposed therebetween.

The RFID TAG 200 according to FIG. 3 has separate memory chips 212 and 232 embedded in the first and second substrates 210 and 230, and antennas 214 and 234 are connected to the memory chips 212 and 232, respectively. It is.

At this time, in the embodiment of the present invention, the first substrate 210 is a front substrate and the second substrate 230 is a rear substrate, and this order may be arbitrarily determined. In addition, in FIG. 3, two readers 300 are illustrated in order to show that the first substrate 210 and the second substrate 230 communicate with the reader 300 in both directions through the antennas 214 and 234, respectively. In addition, in FIG. 3, for convenience, the direction in which the first substrate 210 faces the front side and the direction in which the second substrate 230 faces the rear surface will be described.

Referring to the embodiment of the present invention, as shown in FIG. 3, the first substrate 210 and the second substrate 230 are stacked with the main substrate 220 interposed therebetween. In this case, the first substrate 210 and the second substrate 230 are made of a transparent plastic material having an empty internal space. Referring to the internal spaces of the first and second substrates 210 and 230, the memory chips 212 and 232 may be formed. The antennas 214 and 234 protrude from the memory chips 212 and 232, respectively, and protrude into the inner spaces of the first and second substrates 210 and 230.

That is, the first memory chip 212 is embedded in the first substrate 210, and the first antenna 214 is connected to both ends of the first memory chip 212. Similarly, a second memory chip 232 is embedded in the second substrate 230, and second antennas 234 are connected to both ends of the second memory chip 232.

In this case, the memory chips 212 and 232 are configured of a semiconductor integrated circuit that stores the same authentication ID and memory, and the integrated circuit includes a microprocessor such as a CPU, a card operating system, a memory, and various modules. In addition, since a large amount of information such as user or transaction information as well as personal information can be stored and used in the ID and memory, various applications such as payment of a card fee as well as a simple door control operation are possible. In particular, this sensitive information can be protected by a microprocessor and encryption. In this case, each of the first memory chip 212 and the second memory chip 232 includes ID confirmation information. In this case, the ID is for having the same authentication and is substantially the same.

The first and second antennas 214 and 234 receive radio waves from the reader 300 and transmit the radio waves including the information stored in the memory chips 212 and 232 back to the reader 300. The antennas 214 and 234 enable to transmit or receive signals in the form of electromagnetic waves in accordance with the principle of electromagnetic induction in the electromagnetic field. At this time, since the reader 300 transmits a radio wave having a predetermined range of resonant frequencies, the RFID TAG 100 operates only when the resonant frequencies of the radio waves received by the antennas 214 and 234 correspond to a predetermined range. In this case, the first antenna 214 and the second antenna 234 have the same resonance frequency as the memory chips 212 and 232. That is, the first antenna 214 and the second antenna 234 receive the radio waves in the frequency band of the same range.

Next, the main substrate 220 has a metal plate 224 made of iron, nickel, or the like, a planar conductive material in the center thereof, and non-conductive materials 222 and 226 such as ferrite or interface space on both sides of the metal plate. ) Are stacked.

The interface composed of ferrite or empty space is non-conductive, and serves to fix the impedance of the metal material around the RFID TAG 200 so that the RFID TAG 200 can communicate with the reader in both directions. That is, the non-conductive materials 222 and 226 are laminated on both sides of the metal plate 224 so that the impedance having a large change amount is fixed in advance by the metal plate 224 and the surrounding environment, and thus belongs to the READ RANGE regardless of the position of the reader 300. In this case, the RFID 200 can stably communicate with the reader 300.

As such, by providing separate antennas 214 and 234 and memory chips 212 and 232 for the first and second substrates 210 and 230, bidirectional communication with the reader 300 is possible without reducing the read range. .

4 schematically shows a configuration of a system including an RFID TAG 200 according to an embodiment of the present invention.

As shown in FIG. 4, a system including an RFID TAG according to an exemplary embodiment of the present invention includes an RFID TAG 200, a reader 300, a host computer 400, and a database 500.

The RFID TAG 200 continuously emits a detection signal having a frequency of a specific band through an antenna provided therein, and at the same time receives data transmitted from an RFID tag, and the reader 300 through antennas 214 and 234 installed on both sides. It serves to deliver.

The reader 300 transmits a detection signal toward the antenna embedded in the RFID TAG 200, and decodes data received from the RFID TAG 200 through the RFID antenna. At this time, even if the reader 300 recognizes each ID through the antennas 214 and 234 installed on both sides of the RFID TAG 200, the reader 300 recognizes that one ID is received because the stored IDs are the same.

The host computer 400 receives the data decrypted by the reader 300, compares the data with the data of the database 500, checks whether the data is registered, and if the data is registered, performs a pre-input operation. That is, the database 500 stores information on accessible users or other information necessary for card payment, asset management, and the like.

Therefore, the system including the RFID TAG 200 according to the embodiment of the present invention can be used not only in the security system but also in various systems such as a payment system and an asset management system in connection with a fee management server.

Although the preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the invention defined in the following claims are also provided. It belongs to the scope of rights.

As described above, the RFID TAG according to the present invention can perform wireless communication in both directions, and perform ID verification with a reader within a certain distance by minimizing the influence of the surrounding environment.

Claims (14)

In the RFID TAG that performs authentication through wireless communication with the reader when the external reader is approached, A fixing member formed by stacking a non-conductive material on both sides of a planar conductive material; A first memory chip mounted on a first surface of the fixing member and storing a first ID; A second memory chip mounted on a second surface of the fixing member and storing a second ID; A first antenna connected to the first memory chip and having a first resonant frequency; A second antenna connected to the second memory chip, the second antenna having a second resonance frequency; The first memory chip and the second memory chip are the same kind of semiconductor chip, The first ID and the second ID is the same ID, And the first resonant frequency and the second resonant frequency are the same frequency. delete delete delete The method of claim 1, RFID TAG capable of wireless communication with the reader in both directions of the first and second surfaces of the fixing member through the first and second antennas. The method according to claim 1 or 5, The RFID TAG is a contactless RFID TAG. The method according to claim 1 or 5, The RFID TAG is an RFID TAG that receives RF power from the external reader and uses the power. The method of claim 7, wherein And the external reader recognizes only one ID of the first ID and the second ID. An RFID TAG that mounts the first memory chip storing the first ID and the second memory chip storing the second ID on both sides of the fixing member, respectively; A reader for wireless communication with a first antenna and a second antenna connected to the first and second memory chips when the RFID TAG is in proximity; And a controller configured to transmit information input to the reader to an external device by comparing the first ID and the second ID stored in the first and second memory chips. The method of claim 9, The fixing member is formed by stacking a non-conductive material on both sides of the planar conductive material. The method of claim 10, And the first ID and the second ID are the same ID. The method of claim 11, And the first antenna and the second antenna have the same resonant frequency band. The method according to any one of claims 9 to 12, The RFID TAG is a contactless RFID system. The method according to any one of claims 9 to 12, The RFID TAG receives an RF power from the external reader and uses it as a power source.

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