KR20090006340A - Radio frequency identification tag for preserving tag data and radio frequency identification system for using the radio frequency identification tag - Google Patents

Abstract

A radio frequency identification tag for preserving tag data and a radio frequency identification system for using the radio frequency identification tag are provided to expose or change the information of an RFID tag(Radio Frequency IDentification) tag by selectively shielding the RFID tag only when a user of the RFID tag wants. An RFID tag selectively transmits tag information according to a request from an RFID reader(201) when the RFID reader transmits a tag information request signal to an RFID tag(202) which exists in a recognition range. An RFID signal controller(205) which is installed between an RFID tag chip(203) including tag information and an antenna radiator(204) transceiving an electronic wave signal controls the transmission and reception of the RFID signal according to an external signal inputted to an RFID tag to selectively transmit the tag information.

Description

RDF tag protecting RID information and RDF system using the RDF tag {RADIO FREQUENCY IDENTIFICATION TAG FOR PRESERVING TAG DATA AND RADIO FREQUENCY IDENTIFICATION SYSTEM FOR USING THE RADIO FREQUENCY IDENTIFICATION TAG}

RFID is a technology for processing information of an object using a small semiconductor chip. A RFID is a non-contact recognition system that transmits and processes information of an object and surrounding environment information at a radio frequency by attaching a small chip to various items. RFID, which consists of an RFID reader with a read / decode function and an RF tag with unique information, operating software, and a network, RFID processes information by identifying a thin flat tag attached to an object.

Such RFID does not have to be in direct contact or scanning in the visible band as a bar code. Because of these advantages, it is evaluated as a technology to replace the bar code, and the scope of application is expanding. Low frequency identification systems (30 kHz to 500 kHz) are used at short distances of less than 1.8 m, while high frequency systems (850 MHz to 950 MHz or 2.4 GHz to 2.5 GHz) are capable of transmission over long distances of more than 27 m. That is, RFID is a system that recognizes the information of the RFID tag within a few meters by processing the data by connecting the antenna to the RFID reader.

In particular, in the RFID system of the UHF band, when the RFID reader outputs a transmission signal, the tag converts the signal into an operating power source, reads the transmission signal based on this, and exchanges tag information. Such an RFID system may be used as a means of constant control such as management or security such as logistics.

1 is an example for explaining an RFID system in the prior art. When the RFID reader 101 requests the tag information included in the RFID tag 102 from the RFID tag 102, the RFID reader 102 uses its own power source or transmits a transmission signal according to the tag information request as an operation power source. The tag information is transmitted to the RFID reader 101 by using the tag information, and the tag information is received by the RFID reader 101.

However, the procedure of receiving tag information according to the related art has a problem that tag information of an RFID tag may be exposed or changed by an arbitrary RFID reader regardless of the owner's intention. In addition, there is a problem that causes the malfunction if the owner makes unintended access to the recognition range of any reader.

In addition, when only one ID is used for one tag, when only one service is supported with one tag, a reception rate may be lowered due to overlap when multiple tags are used, and collision may occur.

According to the present invention, by selectively shielding an RFID tag or shorting / opening an RFID tag chip unit and an antenna radiator using an impedance mismatch or a switch, the tag information of the RFID tag can be exposed or changed only when the owner of the RFID tag wants to. An RFID tag and an RFID system using the RFID tag are provided.

According to the present invention, by storing a plurality of different tag information through an RFID tag chip unit composed of a plurality of chips, and selectively exposing through a switch, it is possible to reduce the inconvenience of having a plurality of RFID tags and to reduce costs. An RFID tag and an RFID system using the RFID tag are provided.

The present invention provides a single RFID tag by exposing the tag information through a multi-band antenna by switching the plurality of chips or by exposing the tag information by switching the plurality of radiating elements and the plurality of chips having different frequencies. Provided are an RFID tag usable in various frequency bands and an RFID system using the RFID tag.

The present invention includes a plurality of tag identifiers in one tag having a plurality of chips, and by transmitting the plurality of tag identifiers simultaneously or sequentially RFID tag and the interference problem of radio signals between antennas and the collision can be solved Provides an RFID system using an RFID tag.

The present invention can prevent the exposure and change of unwanted tag information by detaching the RFID tag or adjusting the radio wave inflow rate only when the owner wants through the function of detaching the RFID tag, blocking the radio wave inflow or adjusting the radio wave inflow amount. It provides a radio wave shielding device.

According to an embodiment of the present invention, an RFID tag (Radio Frequency IDentification) includes an RFID tag chip unit including tag information, an antenna radiator for transmitting and receiving a radio signal, and transmission and reception of an RFID signal between the RFID tag chip unit and the antenna radiator. It may include an RFID signal controller for controlling the. In this case, the RFID signal controller may short-circuit or open a line connected between the RFID tag chip unit and the antenna radiator through an electrical or mechanical switch, or electrically or mechanically connect an antenna mismatch circuit or device to a line connected between the RFID tag chip unit and the antenna radiator. Transmission and reception of the RFID signal can be controlled by shorting or opening the switch.

According to one aspect of the invention, the RFID tag chip unit may be composed of a plurality of chips (chip) including different tag information, the RFID signal control unit, one of the plurality of chips and the antenna radiator It may include a switch for switching the connection between the control unit for controlling the switch unit and the selected chip of the plurality of chips connected to the antenna radiator. In this case, the switch unit may include an RF switch that electrically opens or closes the connection, or a mechanical switch that opens or closes the connection by moving a physical short circuit.

According to an aspect of the present invention, the antenna radiator may include a plurality of radiating elements including a multi-band antenna or operating at different frequencies. Here, when the antenna radiator is composed of the plurality of radiating elements, the RFID signal controller may include a switch unit for switching a connection between one chip of the plurality of chips and one radiating element of the plurality of radiating elements; A control unit may be configured to control the switch unit to connect a selected chip among a plurality of chips and a selected radiating element among the plurality of radiating elements.

According to the present invention, by selectively shielding an RFID tag or by shorting / opening an RFID tag chip unit and an antenna radiator by using an impedance mismatch or a switch, the tag information of the RFID tag is exposed or only when the owner of the RFID tag wants to. Can be changed.

According to the present invention, by storing a plurality of different tag information through the RFID tag chip unit consisting of a plurality of chips, and selectively exposed through the switch, it is possible to reduce the inconvenience of having a plurality of RFID tags, to reduce the cost Can be.

According to the present invention, one RFID by switching the plurality of chips to expose the tag information through a multi-band antenna or a plurality of radiating elements having different frequencies and the plurality of chips to expose the tag information The tag is available in various frequency bands.

According to the present invention, by including a plurality of tag identifiers in one tag having a plurality of chips, and transmitting the plurality of tag identifiers simultaneously or sequentially, it is possible to solve the interference and collision problems of radio signals between antennas.

According to the present invention, the RFID tag is detached, and the RFID tag is detached only when the owner wants it through a radio wave shielding device that blocks the radio wave inflow or controls the radio wave inflow, or exposes unwanted tag information by adjusting the radio wave inflow amount. And change can be prevented.

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

2 is an example illustrating an overview of an RFID tag according to an embodiment of the present invention.

When the RFID reader 201 transmits a transmission signal for requesting tag information to the RFID tag 202 existing in the recognition range, the RFID tag 202 may selectively transmit the tag information according to the request. To this end, the RFID tag 202 according to an embodiment of the present invention has an RFID signal controller 205 between the RFID tag chip unit 203 including the tag information and an antenna radiator 204 for transmitting and receiving radio signals. In addition, the tag information may be selectively transmitted by controlling transmission and reception of the RFID signal according to an external signal input to the RFID tag 202.

That is, the RFID tag 202 may include a function that allows the owner to determine whether or not to transmit and receive the RFID signal, and the RFID signal controller 205 may include an RFID tag chip unit according to an external signal generated by the function. The RFID signal may be transmitted between the 203 and the antenna radiator 204 or the transmission of the RFID signal may be blocked. In this case, the function may be provided to the owner through various methods such as a switch or a button.

In addition, in addition to the method of blocking the RFID signal between the RFID tag chip unit 203 and the antenna radiator 204, it is possible to use a method of shielding the RFID tag to block radio waves or blocking the inflow of radio waves as necessary.

Through the method of blocking the RFID signal between the antenna radiator and the RFID tag chip as described above, the RFID tag is shielded through FIGS. In addition, the radio wave shielding device for controlling the transmission of the tag information by adjusting the inflow of radio waves will be described in more detail with reference to FIG. 11.

3 is a block diagram illustrating an internal configuration of an RFID tag according to an embodiment of the present invention. In FIG. 3, the RFID tag 300 includes an RFID tag chip unit 301, an RFID signal controller 302, and an antenna radiator 303.

The RFID tag chip unit 301 includes tag information. That is, various types of information and tag identifiers to be stored in the RFID tag 300 may be stored in the RFID tag chip unit 301. The RFID tag chip unit 301 may be composed of a plurality of chips including different tag information. This is to overcome the situation of having to use a plurality of tags in accordance with the domestic and international circumstances that it is difficult to use an integrated tag identifier to recognize the tag identifier and tag information required for each institution in each of the plurality of chips, and optionally the desired tag. This is to make identifier and tag information available.

The antenna radiator 303 transmits and receives a radio signal. That is, a radio wave signal transmitted by an RFID reader is received or a radio wave signal is transmitted to transmit the tag information to the RFID reader. The antenna radiator 303 may also be composed of a multiband antenna or a plurality of radiating elements due to the necessity of transmitting the different tag information at different frequencies.

The RFID signal controller 302 controls the transmission and reception of RFID signals between the RFID tag chip unit 301 and the antenna radiator 303. In this case, the RFID signal controller 302 controls the transmission and reception of the RFID signal by shorting or opening a line connected between the RFID tag chip unit and the antenna radiator through an electrical or mechanical switch, or between the RFID tag chip unit and the antenna radiator. Transmission and reception of the RFID signal may be controlled by shorting or opening an antenna mismatch circuit or an element through an electrical or mechanical switch to a connected line.

As described above, the method for controlling the transmission and reception of the RFID signal using the mismatching circuit or the device is described with reference to FIG. 4. This is explained in more detail in section 5. In addition, the case in which the RFID tag chip unit 301 is composed of a plurality of chips including different tag information will be described in more detail with reference to FIGS. 6 to 10.

4 is an example of an RFID tag that controls transmission and reception of an RFID signal using a mismatch circuit or an element according to the present invention. In FIG. 4, an RFID signal is transmitted / received by shorting or opening a mismatched circuit or element 403 using an electrical or mechanical switch 404, which may change impedance in a line between the antenna radiator 401 and the RFID tag chip unit 402. It shows how to control.

That is, when the owner of the RFID tag is not allowed to communicate with the RFID reader, the electrical or mechanical switch 404 may be shorted to the line to cause impedance mismatch between the antenna radiator 401 and the RFID tag chip unit 402. In this case, both the RFID signal applied to the antenna radiator 401 and the RFID signal transmitted from the RFID tag chip unit 402 may be totally reflected to control transmission and reception of the RFID signal.

5 is an example of an RFID tag that controls transmission and reception of an RFID signal using a switch according to the present invention. FIG. 5 illustrates a method of controlling transmission and reception of the RFID signal by shorting or opening a line connected between the antenna radiator 501 and the RFID tag chip unit 502 through an electrical or mechanical switch 503.

That is, when the owner of the RFID tag is not allowed to communicate with the RFID reader, communication between the RFID reader and the RFID tag may be blocked by opening an electrical or mechanical switch 503.

As described above, when using the RFID tag according to the embodiment of the present invention, the RFID tag may be selectively shielded or may be shorted / opened between the RFID tag chip unit and the antenna radiator using an impedance mismatch or a switch. Only when the tag information of the RFID tag can be exposed or changed.

6 is an example illustrating an overview of an RFID tag composed of multiple chips according to the present invention. As described above, the use of a plurality of tags for each institution is not only inconvenient to possess, but also requires a high cost, so the RFID tag chip unit 601 is composed of a plurality of chips each capable of storing different tag information. This can solve the above problem.

In this case, one chip may include one tag information, and the RFID signal controller 602 switches the chip selected by the owner among the plurality of chips or a chip including information required by the RFID reader to switch the antenna radiator 603. ) To control the transmission and reception of RFID signals. For example, when the chip 604 is selected, the RFID signal controller 602 uses only the above-described electrical or mechanical switch, mismatch circuit, or element, so that the RFID signal is transmitted only between the chip 604 and the antenna radiator 603. Can be sent and received.

Alternatively, by sequentially transmitting the information included in the plurality of chips to the RFID reader, it is possible to expect an effect of expanding the amount of information that one RFID tag can store and increasing security by permutation.

In addition, the plurality of chips may use various types of chips by inserting matching circuits for each chip together, and the antenna radiator 603 may also use a multiband antenna or a plurality of radiating elements to adjust frequencies of various bands. It is available.

In addition, when a plurality of tags are used at the same time, the recognition rate may be greatly reduced due to interference and collision problems between antennas, so that a plurality of tag identifiers are placed in a single tag having a plurality of chips. The problem may be solved by simultaneously or sequentially transmitting two tag identifiers.

7 is an example of an RFID tag configured with a single frequency band in accordance with the present invention.

That is, the RFID tag chip unit 701 may be composed of a plurality of chips including different tag information as shown, the above-described RFID signal control unit between the one of the plurality of chips and the antenna radiator 702 It may include a switch unit for switching the connection and the control unit 703 for controlling the switch unit so that the selected chip of the plurality of chips are connected to the antenna radiator 702.

In this case, the switch unit may include a switch 704 such as an RF switch that electrically opens and closes the connection as shown in FIG. 7, or a mechanical switch that opens or closes the connection by moving a physical short circuit.

For example, when one chip 705 of the plurality of chips is selected by an external signal input from a selection switch mounted on an RFID reader or a tag, the controller 703 controls the switch to control the chip 705. By connecting the antenna radiator 702 with each other, the required RFID signal can be transmitted and received.

8 is an example of an RFID tag configured with multiple frequency bands in accordance with the present invention. 8 shows an example of an RFID tag using a frequency of multiple bands.

That is, the RFID tag chip unit 801 may be composed of a plurality of chips including different tag information as shown, the antenna radiator 802 may also be composed of a plurality of radiating elements having different frequencies. .

In this case, the antenna radiator 1-n and the antenna radiator 2-n constituting the antenna radiator 802 may be radiating elements having different polarities operating at the same frequency, and n antenna radiators 1-n and n antenna radiators 2- n may be a radiating element operating at different frequencies. In addition, the radiating elements may be configured separately as shown in FIG. 8, but may be used as a single element using a multiband antenna, that is, the multiband antenna described above.

The above-described RFID signal controller may include a switch unit for switching a connection between one chip of the plurality of chips and one radiating element of the plurality of radiating elements, a chip selected from the plurality of chips, and a plurality of radiating elements. It may include a control unit 803 for controlling the switch unit so that the selected radiating element is connected. Here, the switch unit may include a switch 804 such as an RF switch that electrically opens and closes the connection.

For example, the controller 803 controls the switch 804 so that the chip 805 selected by the external signal and the antenna radiators 1-2 806 corresponding to the operating frequency of the chip 805 are connected to each other. RFID signals can be transmitted and received. In this case, the matching circuit 807 may be used to connect the chip 805 in the switch 804.

Here, even if the plurality of radiating elements are used, since each radiating element does not operate at the same time, there is little interference between frequencies, and it is possible to use various kinds of chips and frequencies of various bands rather than one type.

As described above, when the RFID tag according to the present invention is stored, a plurality of different tag information is stored through an RFID tag chip unit composed of a plurality of chips and selectively exposed through a switch, thereby inconvenient to possess a plurality of RFID tags. Reduce costs and reduce costs. In addition, by switching the plurality of chips to expose the tag information through a multi-band antenna or a plurality of radiating elements having a different frequency and the plurality of chips by switching the plurality of chips to expose a variety of RFID tag Available in the frequency band.

In addition, by including a plurality of tag identifiers in a tag having a plurality of chips, and transmitting the plurality of tag identifiers simultaneously or sequentially, it is possible to solve the interference and collision problems of radio signals between antennas. Selective delivery of the tag identifier by the switch enables security.

9 is an example of an RFID tag constructed via a horizontally movable mechanical switch in accordance with the present invention. Reference numeral 900 denotes an example of an RFID tag using a horizontally movable mechanical switch. At this time, the RFID tag chip unit 901 may be composed of a plurality of chips, the array stage 903 in which the plurality of chips are arranged as shown in FIG. 9 to connect the plurality of chips and the antenna radiator 902. Or the feed stage 904 is moved horizontally, thereby making contactless or couple feeding non-contact chip selection possible.

For example, the RFID signal controller may move the chip 905 and antenna radiator 902 by lowering the array end 903 downward in FIG. 9 or raising the feed end 904 upward in order to select the chip 905. ) Can be connected to each other.

10 is an example of an RFID tag constructed via a vertically movable mechanical switch in accordance with the present invention. Reference numeral 1010 shows an example of an RFID tag using a vertically movable mechanical switch. In this case, as in FIG. 9, the RFID tag chip unit 1011 may be configured of a plurality of chips.

Here, a chip mounting part including each chip is configured to be vertically moved so that one chip is selected and connected to the antenna radiator 1012, or a feed chip corresponding to each chip is vertically moved. Can be selected. That is, as an example, the reference numeral 1020 is connected between the chip 1013 and the antenna radiator 1012 through vertical movement of the chip mounting portion 1014 including the chip 1013 to select the chip 1013. It can be set.

11 is a view for explaining a radio wave shielding apparatus according to the present invention.

Reference numeral 1101 denotes an example of a radio wave shielding device capable of shielding the RFID tag 1102 itself. In this case, as shown in FIG. 11, the owner may detach the RFID tag 1102 from the radio wave shielding device that blocks radio waves. That is, when the owner removes the RFID tag 1102 from the radio wave shielding device, communication between the RFID tag 1102 and the RFID reader period becomes possible, and when the RFID tag 1102 is attached to the radio wave shielding device, radio waves are transmitted. Communication with the RFID reader may be blocked through the radio wave shielding device having a blocking property.

In addition, in order to eliminate the hassle of detaching the RFID tag 1102 as needed, by using the radio wave shielding device that is controlled whether the inflow of the radio wave is controlled by controlling the inflow of the radio wave as necessary, RFID only when the owner wants It is possible to enable communication between the tag 1102 and the RFID reader period.

As such, when using the radio wave shielding device according to the present invention, the RFID tag is detached, and the RFID tag is detached only when the owner desires through the radio wave shielding device which blocks the radio wave inflow or controls the radio wave inflow amount, or adjusts the radio wave inflow amount. This prevents unwanted exposure and change of tag information.

In the present invention as described above has been described by the specific embodiments, such as specific components and limited embodiments and drawings, but this is provided to help a more general understanding of the present invention, the present invention is not limited to the above embodiments. For those skilled in the art, various modifications and variations are possible from these descriptions.

Therefore, the spirit of the present invention should not be limited to the described embodiments, and all the things that are equivalent to or equivalent to the claims as well as the following claims will belong to the scope of the present invention. .

1 is an example for explaining an RFID system in the prior art.

2 is an example illustrating an overview of an RFID tag according to an embodiment of the present invention.

3 is a block diagram illustrating an internal configuration of an RFID tag according to an embodiment of the present invention.

4 is an example of an RFID tag that controls transmission and reception of an RFID signal using a mismatch circuit or an element according to the present invention.

5 is an example illustrating an overview of an RFID tag composed of multiple chips according to the present invention.

6 is an example of an RFID tag that controls transmission and reception of an RFID signal using a switch according to the present invention.

7 is an example of an RFID tag configured with a single frequency band in accordance with the present invention.

8 is an example of an RFID tag configured with multiple frequency bands in accordance with the present invention.

9 is an example of an RFID tag constructed via a horizontally movable mechanical switch in accordance with the present invention.

10 is an example of an RFID tag constructed via a vertically movable mechanical switch in accordance with the present invention.

11 is a view for explaining a radio wave shielding apparatus according to the present invention.

<Explanation of symbols for the main parts of the drawings>

300: RFID tag

301: RFID tag chip

302: RFID signal control unit

303: antenna radiator

Claims (9)

RFID (Radio Frequency IDentification) tag, An RFID tag chip unit including tag information; An antenna radiator for transmitting and receiving radio signals; And RFID signal controller for controlling the transmission and reception of RFID signals between the RFID tag chip unit and the antenna radiator RFID tag comprising a. The method of claim 1, The RFID signal controller, RFID tag to control transmission and reception of the RFID signal by short-circuit or opening a line connected between the RFID tag chip unit and the antenna radiator through an electrical or mechanical switch. The method of claim 1, The RFID signal controller, RFID tag for controlling transmission and reception of the RFID signal by short-circuit or opening an antenna mismatch circuit or element through an electrical or mechanical switch on a line connected between the RFID tag chip unit and the antenna radiator The method of claim 1, The RFID tag chip unit is composed of a plurality of chips (chip) including different tag information, The RFID signal controller, RFID tag switching a connection between one of the plurality of chips and the antenna radiator. The method of claim 1, The RFID tag chip unit is composed of a plurality of chips (chip) including different tag information, The antenna radiator includes a multi-band antenna radiator, The RFID signal controller, the RFID tag for switching the connection between one of the plurality of chips and the antenna radiator. The method of claim 1, The RFID tag chip unit is composed of a plurality of chips (chip) including different tag information, The antenna radiator is composed of a plurality of radiating elements operating at different frequencies, The RFID signal control unit, the RFID tag for switching the connection between one chip of the plurality of chips and one of the plurality of radiating elements. The method according to any one of claims 4 to 6, And the connection is switched by changing a relative position of the RFID signal controller and the RFID tag chip unit. The method according to any one of claims 4 to 6, And the connection is switched by changing a relative position of the RFID signal controller and the antenna radiator. The method of claim 1, The RFID signal controller, RFID tag for controlling the transmission and reception of the RFID signal in accordance with the input of an electrical signal.

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