KR20060113228A - Rfid system for communicating readers among tags - Google Patents

Abstract

An RFID(Radio Frequency Identification) system communicating between a reader and a tag is provided to simply relay communication between a reader and a tag and simply execute security by comprising a channel synchronization device for making synchronization with a hopped frequency of the reader. A channel synchronization unit(90) includes channels of every frequency hopping available frequency band of a reader(10), and performs wireless communication through synchronization with a hopped frequency of the reader(10). An RF radiation unit(70) stores an RF signal of the channel synchronization unit(90), transmits an RF, a power supply of a tag(50), to the tag(50) in order to enable communication between the reader(10) and the tag(50).

Description

TECHNICAL FIELD [0001] The present invention relates to a radio frequency identification (RFID)

1 is a block diagram showing a basic configuration of an RFID system according to the related art.

2 is a block diagram showing the operation of the RFID system according to the prior art.

3 is a block diagram showing a basic configuration of a radio frequency identification system according to the present invention.

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

5 is a block diagram showing another embodiment of the RFID system according to the present invention.

FIG. 6 is a detailed diagram illustrating the configuration of the channel synchronization device shown in FIG.

Description of the Related Art

10: Reader 50: Tag

70: Relay device 90: Channel synchronizer

91: antenna 92:

92a: inverter 92b: switch

93: Low noise amplifier for reception 94: Channel synchronizer

95: power supply unit 96: power amplifier for transmission

The present invention relates to a radio frequency identification (RFID) system for reading or recording identification information of an RFID tag in a non-contact manner using a radio frequency, and more particularly, and an RFID reader for communicating between a reader and a tag so as to easily synchronize with a hopped frequency of a reader in an additional device for monitoring communication between the reader and a tag for arbitration.

In general, RFID (Radio Frequency Identification) inputs identification information unique to a smallest IC chip and uses radio frequency (RF) to recognize, track, and manage objects, animals, Technology that can be said. The RFID system includes an RFID tag (Tag or Transponder) to which unique identification information is input and attached to an object or an animal, and a reader (reader or interrogator) for reading or writing the identification information held by the tag in a noncontact manner. An information processing device such as a computer is connected to the reader to process data collected from the tag.

1 is a block diagram showing a basic configuration of an RFID system according to the related art. As shown in the figure, the tag 5 is a passive tag that does not have its own power supply, and is composed of a small-sized semiconductor IC chip and an antenna, and the IC chip has an RF circuit, logic and memory built therein. These tags 5 have various sizes and shapes. The reader 1 includes a transmitter for transmitting an RF signal of a specific frequency band to the tag 5, a receiver for receiving a signal transmitted from the tag 5, and an antenna for transmitting and receiving the RF signal.

2 is a block diagram showing a basic operation of the RFID system according to the related art. As shown in the figure, the reader 1 transmits an RF signal in a predetermined frequency band including a high frequency carrier signal and a predetermined interrogation signal. When the tag 5 is positioned in the electromagnetic field of the reader 1 formed by the RF signal, the tag 5 is supplied with the operating power necessary for operating the IC chip from the high frequency carrier signal of the reader 1. That is, the high frequency carrier signal transmitted from the reader 1 generates an AC in the antenna of the tag, and the generated AC is used as electric energy for the IC chip after being rectified. Further, the tag 5 modulates the received RF signal, and based on the modulated RF signal, reflectively modulates the data stored in the tag 5 and transmits it to the reader 1 as a response signal.

Thus, in the conventional RFID system, not only the information transmission between the reader 1 and the tag 5 but also the power transmission for activating the passive tag is performed.

In order to provide the power consumption of such a tag, there is a technique of transmitting a high-frequency power, which is a high-power transmission having no information related to communication upon completion of interrogation of an RF signal of the reader, . The technology for this high frequency radiation device is disclosed in detail in Korean Patent Publication No. 05-11236. (The eavesdropping is our patent, and the patent is always ON or ON / OFF by communication with the reader.)

On the other hand, there is a possibility that a reader-reader collision occurs among RFID systems in which a plurality of RFID readers are present, which is a great problem in the performance of the RFID system. In order to solve this problem, it has been proposed in the above-mentioned Korean Patent No. 05-11236 that a high frequency radiator has an arbitration function, but when a frequency hopping method is applied to a reader, . If the channel between the reader and the tag and the extended communication protocol are not used, the configuration of the hardware and software of the high frequency radiator and the reader becomes very complicated because of intervention through a separate channel and communication protocol. Therefore, in a communication between a plurality of RFID readers and a radio frequency apparatus using a frequency hopping scheme, a high frequency radiator scans a hopped frequency channel supplied from a reader and synchronizes with a frequency channel of a received RF signal, . In the communication between the reader and the high-frequency radiation device, the responsiveness is determined depending on the frequency scan rate, so that the response is degraded.

In the case of the RFID system using the above-described high-frequency radiation device, in order to completely communicate RF signals between the reader and the tag, the interrogation zone of the reader and the response zone of the tag should overlap. However, since the size of the interrogation zone of the reader is proportional to the output of the RF signal emitted from the reader and is proportional to the response zone of the tag or the output level of the RF signal, the lower the output of the RF signal emitted from the reader The recognition range of the reader becomes narrow. In order to solve such a problem, the high-frequency radiation device is provided so as to easily acquire information of a tag existing in a region other than a question area of a reader. The technology for this high- frequency radiation device is disclosed in Korean Patent Publication No. 05-11235 Lt; / RTI >

In the above-mentioned technology, there has been a problem in that communication between a plurality of readers and a high-frequency radiation apparatus is made only by one channel, and another reader waits until the communication is terminated. Therefore, it is possible to easily add the communication permission request signal (REQ) and the communication permission signal (GRANT) in the communication between the plurality of readers and the high-frequency radiation apparatus, and to allow communication between the multiple readers and the high- One device was required.

SUMMARY OF THE INVENTION The present invention has been made to solve the problems of the RFID system according to the related art. It is a main object of the present invention to provide a RFID system including a channel of all frequency bands capable of frequency hopping of a reader, Reader-tag communication that can solve the communication relay and other additional functions between the reader and the tag by adding the channel synchronizing device synchronizing with the hopped frequency of the reader among the channels of all the frequency bands capable of frequency hopping of the reader in the system And to provide a radio frequency identification system.

According to an aspect of the present invention, there is provided a radio frequency identification system,

Many readers,

A plurality of tags,

A channel synchronizer including a channel of all frequency bands capable of frequency hopping by the reader and performing wireless communication in synchronization with the hopped frequency of the reader;

And a high-frequency radiation device for storing RF signals of the channel synchronizing device, and then communicating between the reader and the tag by transmitting a high-frequency power, which is a power supply of the tag, to the tag.

Here, the channel synchronizer is formed integrally with the intelligent high-frequency radiator and receives an RF signal of a reader through a coherent frequency channel according to a hopping frequency of the reader among the plurality of channels, As shown in Fig. The channel synchronizing apparatus radiates an RF signal that does not include information in the same channel as the channel of the RF signal of the received reader into a plurality of tags.

The channel selection device includes an antenna for reader monitoring; A switching unit switched according to a control signal supplied from the outside to pass an RF signal of a reader received through the reader sensing antenna; A receiving low noise amplifier for filtering and amplifying noise included in the RF signal passed through the switching unit; A channel synchronization unit for passing an output signal of the low noise amplifier through a frequency channel and a coherent frequency channel of an RF signal transmitted through the low noise amplifier among all communicable frequency channels; A power supply unit for supplying power according to a control signal supplied from the outside; And a transmitting power amplifier for amplifying a high frequency provided through the same channel as a channel that has passed through the output signal of the receiving low noise amplifier according to an external power supply of the power supply unit and transmitting the amplified high frequency to the tag through the antenna .

The switching unit includes an inverter for inverting a control signal supplied from the outside, and a switch for switching an RF signal received through the antenna to be switched according to an output signal of the inverter.

The power supply unit is provided with a power switch that is switched according to a control signal supplied from the outside and supplies power to the transmission power amplifier.

Further, the RFID system communicating between the reader-tag according to the present invention,

Many readers,

A plurality of tags,

A channel synchronizer including a channel of all frequency bands capable of frequency hopping by the reader and performing wireless communication in synchronization with the hopped frequency of the reader;

An intelligent high frequency radiation device for storing an RF signal of the channel synchronizing device, transmitting a high frequency power, which is a power supply of the tag, to a tag, collecting information of the tag, and supplying collected information to a reader through a channel synchronizer .

Here, the channel synchronizing device is formed integrally with the intelligent high-frequency wave radiating device, receives the RF signal of the reader through a coherent frequency channel according to the hopping frequency of the reader among the plurality of channels, To the apparatus. The channel synchronizing apparatus radiates an RF signal that does not include information in the same channel as the channel of the RF signal of the received reader into a plurality of tags.

The channel synchronizing apparatus may further comprise: an antenna for reader monitoring; A switching unit switched according to a control signal supplied from the outside to pass an RF signal of a reader received through the reader sensing antenna; A receiving low noise amplifier for filtering and amplifying noise included in the RF signal passed through the switching unit; A channel synchronization unit for passing an output signal of the low noise amplifier through a frequency channel and a coherent frequency channel of an RF signal transmitted through the low noise amplifier among all communicable frequency channels; A power supply unit for supplying power according to a control signal supplied from the outside; And a transmitting power amplifier for amplifying a high frequency provided through the same channel as a channel that has passed through the output signal of the receiving low noise amplifier according to the power source of the power source unit and transmitting the amplified high frequency signal to the tag through the antenna .

The switching unit is provided with an inverter for inverting a control signal supplied from the outside and a switch for switching an RF signal received through the reader monitoring antenna in accordance with an output signal of the inverter.

The power supply unit is provided with a power switch that is switched according to a control signal supplied from the outside and supplies power to the transmission power amplifier.

(Example 1)

 Hereinafter, preferred embodiments of a radio frequency identification system according to the present invention will be described with reference to the accompanying drawings.

3 is a block diagram illustrating an RFID system according to an embodiment of the present invention. As shown in the figure, the RFID system 100 of the present embodiment includes a plurality of readers 10 for transmitting and receiving RF signals, and a plurality of RFID readers 10, A tag 50 for transmitting information of the reader 50 in a backscatterd modulation scheme using an RF signal of the RFID reader 50 and a reader 50 for receiving high frequency power And a channel of all frequency bands capable of being frequency hopped by a plurality of the readers 10 and a frequency f1 of the first reader Rl, And a channel synchronization device (90) for communicating between the reader and the high frequency radiation device (70) in synchronization with each other.

The reader 10 and the tag 50 perform wireless communication using the RF signal f1 in a specific frequency band. Here, the RF signal f1 means a high frequency wave including information such as a question signal and a response signal, and the high frequency wave (CW) means a continuous high frequency wave having no information.

The high frequency wave radiating device 70 is installed separately from the channel synchronizing device 90 but the hopping frequency f1 of the reader 10 and the hopping frequency f2 of the reader 10 are different from each other in order to receive the RF signal supplied from the reader 10 Is wirelessly communicated between the reader 10 and the high frequency radiating device 70 through the synchronized frequency channel f1 and installed integrally with the channel synchronizer 90 for wireless communication via the frequency channel synchronized with this hopping frequency It is possible.

The channel synchronizer 90 transmits the RF signal of the reader R1 through the frequency channel f1 coherent according to the hopping frequency f1 of the reader R1 among the plurality of channels f1- And radiates an RF signal f1, which does not include information on the same channel as the received channel, to the plurality of tags 50.

FIG. 4 is a detailed diagram illustrating the configuration of the channel synchronization device 90 shown in FIG. It should be understood, however, that the present invention is not limited to the above-described embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. The scope of rights of the present invention is not limited to the illustrated examples.

The channel synchronizer 90 switches the RF signal of the reader 10 received through the antenna 91 by switching the antenna 91 and a control signal CONT supplied from the outside, A receiving low noise amplifier 93 for filtering and amplifying the noise included in the RF signal having passed through the switching unit 92 and a receiving low noise amplifier 93 for filtering out all of the communicable frequency channels f1 to fn A channel synchronizer 94 for passing an output signal of the low noise amplifier 93 through a communication frequency channel f1 of an RF signal passed through the low noise amplifier 93 and a coherent frequency channel f1, (F1) passing through the output signal of the low noise amplifier (93) in accordance with the power supply (Vcc) of the power supply unit, and a control unit Frequency (CW) or watt-hour signal provided through the same channel (f1) And a transmitting power amplifier 96 for amplifying the information of the tag 50 and transmitting the amplified information to the tag 50 or the reader R1 through the antenna 91. [ Here, the control signal supplied from the outside is a signal for selecting transmission / reception of the channel synchronizer 90.

The switching unit 92 includes an inverter 91a for inverting a control signal CONT supplied from the outside and a switching unit 92b for switching the RF signal received through the antenna 91 in accordance with an output signal of the inverter 91a, As shown in FIG.

The power supply unit is provided with a power switch 95 that is switched according to a control signal CONT supplied from the outside and supplies the power Vcc to the power amplifier 96 for transmission.

The RF signal of the predetermined frequency band f1 supplied from the reader 10 is supplied to the switching unit 92 via the antenna 91. The operation of the channel synchronizer 90 will now be described.

The switching unit 92 passes an RF signal received from the antenna 91 according to a control signal inverted from a control signal CONT supplied from the outside. That is, the control signal CONT is inverted by the inverter 92a, and the inverted control signal is supplied to the gate of the switch 92b. The switch 92b switches the on / off state according to the level of the gate signal, and passes the RF signal received from the antenna 91 when the switch 92b is switched on.

At this time, the frequency channel f1 of the RF signal is one of all frequency channels f1-fn capable of hopping.

The RF signal having passed through the switching unit 92 is filtered and amplified through the receiving low noise amplifier 93, and then supplied to the channel selecting unit 94.

The channel synchronization unit 94 is connected to the frequency channel f1 of the RF signal that has passed through the switching unit 92 among the plurality of frequency channels f1 to fn through a frequency channel f1 coherent with the frequency channel f1. And passes the RF signal of the credit low noise amplifier 93.

The RF signal passed through the frequency channel (f1) of the channel selection unit (94) is supplied to the high frequency radiation device (70). The high frequency radiation device 70 emits a high frequency microwave in a predetermined frequency band that does not have any information so as to transmit power wirelessly to the tag 50 and the reader 10 irradiates the emitted high frequency wave CW And receives the information that the tag 50 transmitted from the tag 50 has.

That is, the high frequency supplied from the high-frequency wave radiating device is supplied to the transmitting power amplifier 96. The high frequency power CW is switched according to a control signal CONT supplied from the outside and amplified and filtered through a transmission power amplifier 96 activated by a power source Vcc supplied thereto, 50). The tag 50 is activated by this high frequency.

In addition, when the radio frequency radiation device has a function of arbitrating the collision between the readers, communication between the reader 10 and the high frequency radiating device 70 must be performed, and the communication permission request signal REQ supplied from the reader 10 is transmitted to the high- Transmits to the reader 10 a communication permission signal GRANT responding to the communication permission request signal REQ transmitted to the radiating device 70 and received via the channel synchronized with the hopping frequency channel of the reader 10 . Communication is made through the authorized channel between the reader 10 which receives this communication permission signal and the tag 50 activated by the high frequency supplied from the high frequency radiation device 70. [ At this time, the communication permission request signal of the reader and the communication permission signal of the radio frequency radiation apparatus are made low output, so that the interference between the reader and the reader is prevented.

The reader 10 demodulates the reflected modulated RF signal supplied from the tag 50 and provides the collected information to a computer or a host server through a network not shown.

According to the first embodiment of the present invention, the frequency channel for communication between the high-frequency radiation device and the reader is simply synchronized with the frequency hopped by the reader, and also, It is possible to simply add the communication permission request signal of the reader and the communication function of the communication permission signal of the radio frequency radiation device to the communication protocol between the existing reader and the high frequency radiation device.

(Example 2)

 Hereinafter, preferred embodiments of a radio frequency identification system according to the present invention will be described with reference to the accompanying drawings.

5 is a block diagram illustrating an RFID system according to an embodiment of the present invention. As shown in the figure, the RFID system 100 of the present embodiment includes a plurality of readers 110 for transmitting and receiving an RF signal, a first reader R 1 of the plurality of readers 110, and an intelligent high- A tag 150 for transmitting information possessed by the RF signal in a backscattered modulation scheme using an RF signal of a specific frequency band f1 to be transmitted, An intelligent radio frequency device 170 for responding to a question of a reader using information of a tag 150 and a channel of all frequency bands capable of frequency hopping of a plurality of readers 10, And a channel synchronizer 190 that performs radio communication in synchronism with the hopped frequency f1 of the channel synchronizer 190. [

The reader 110 and the tag 150 perform wireless communication using the RF signal f1 in a specific frequency band. Here, the RF signal f1 means a high frequency wave including information such as a question signal and a response signal, and the high frequency wave (CW) means a continuous high frequency wave having no information.

The intelligent high frequency radiator 170 may be installed separately from the channel synchronizer 90 so as to detect the communication state between the reader 110 and the tag 150, may be wirelessly communicated via the frequency channel f1 synchronized with the hopping frequency f1 and integrated with the channel synchronizer 190 for wireless communication via the frequency channel synchronized with this hopping frequency.

The channel synchronizer 190 receives the RF signal of the reader R1 through a frequency channel f1 coherent according to the hopping frequency f1 of the reader R1 among the plurality of channels f1- And radiates the RF signal f1 including the tag information collected in advance to the reader 110 in the same channel as the received channel. In order to collect tag information in advance, the intelligent high frequency radiator 170 operates like a fixed reader that periodically sends a query signal to a tag and receives a response signal.

FIG. 6 is a detailed diagram of the configuration of the channel synchronization device 90 shown in FIG. It should be understood, however, that the present invention is not limited to the above-described embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. The scope of rights of the present invention is not limited to the illustrated examples.

The channel synchronizer 190 switches the RF signal of the reader 110 received through the antenna 191 according to the control signal CONT supplied from the outside and the antenna 191, A receiving low noise amplifier 193 for filtering and amplifying the noise included in the RF signal having passed through the switching unit 192 and a receiving low noise amplifier 193 for filtering out all of the communicating frequency channels f1 to fn A channel synchronizer 194 for passing an output signal of the low noise amplifier 93 through a communication frequency channel f1 of an RF signal passed through the low noise amplifier 193 and a coherent frequency channel f1, A power supply unit for passing a power supply Vcc according to a control signal CONT supplied from the outside and a power supply unit for supplying power to the frequency channel f1 ) Provided through the same channel (f1) And a transmission power amplifier 196 for amplifying the information of the tag 50 or the tag 50 and transmitting the amplified information to the tag 150 or the reader R 1 through the antenna 91. Here, the control signal supplied from the outside is a signal for selecting transmission / reception of the channel synchronizer 190.

The switching unit 192 includes an inverter 191a for inverting a control signal CONT supplied from the outside and a switching unit 191b for switching the RF signal received through the antenna 191 in accordance with an output signal of the inverter 191a, As shown in FIG.

The power supply unit is provided with a power switch 95 that is switched according to a control signal CONT supplied from the outside and supplies the power Vcc to the transmission power amplifier 196.

The RF signal of the predetermined frequency band f1 supplied from the reader 110 is supplied to the switching unit 192 through the antenna 191. The operation of the channel synchronizer 190 will now be described.

The switching unit 192 inverts the control signal CONT supplied from the outside and then passes the RF signal received from the antenna 191 according to the inverted control signal. That is, the control signal CONT is inverted by the inverter 192a, and the inverted control signal is supplied to the gate of the switch 192b. The switch 192b switches the on / off state according to the level of the gate signal, and passes the RF signal received from the reader monitoring antenna 191 when the switch 192b is switched to the on state.

At this time, the frequency channel f1 of the RF signal is one of all frequency channels f1-fn capable of hopping.

The RF signal having passed through the switching unit 192 is filtered and amplified by the receiving low noise amplifier 193, and then supplied to the channel selecting unit 194. [

The channel synchronization unit 194 may receive the frequency channel f1 of the RF signal transmitted through the switching unit 192 among a plurality of frequency channels f1 to fn through a frequency channel f1 coherent with the frequency channel f1, And passes the RF signal of the credit low noise amplifier 193.

The RF signal passed through the frequency channel f1 of the channel selector 94 is supplied to the intelligent high frequency radiator 170. [ The intelligent high frequency radiator 170 transmits the information of the tag 150 collected in advance to the reader in the form of a response signal.

The intelligent high frequency radiator 170 transmits an RF signal having a command for requesting transmission of information held by the tag 150 to a plurality of tags 150 periodically activated, 150 radiates information including the identification information of the tag to the intelligent high frequency radiator 170. The information of the plurality of emitted tags 150 is transmitted to the intelligent high frequency radiator 170, (170) stores information of the tag (150).

At this time, if an RF signal having a command to request a response of the tag 150 from one of the readers 110 of the plurality of the readers 110 is radiated and received by the intelligent high frequency radiator 170, Transmits the information of the previously stored tag 150 to the tag 150 or the communicating reader R1 in the same frequency channel f1 as the frequency channel f1 of the RF signal passed through the channel synchronizer 194 .

That is, information of the high frequency or the tag 150 supplied from the intelligent high frequency radiator 170 is supplied to the transmitting power amplifier 196. The high frequency CW and the response signal are filtered and amplified through a power amplifier 96 activated by an external power supply Vcc switched and supplied according to a control signal CONT supplied from the outside, Tag 150 as shown in FIG.

In the RFID system according to the above embodiment, the intelligent high frequency radiator 170 processes RFID tag operating software for processing information received from the tag 150 and information supplied from the reader of each reader 110 And receives the RF signal of the predetermined frequency channel f1 of the channel synchronization unit 194 and stores the RF signal of the predetermined frequency channel f1 of the tag synchronization unit 194, And supplies it to the reader R1 via the frequency channel f1.

The reader 110 demodulates the reflected and modulated RF signal and provides the collected information to a computer or a host server through a network not shown.

According to the second embodiment of the present invention, since the intelligent high-frequency radiation apparatus includes information on a plurality of tags, communication can be simultaneously performed between each of the plurality of readers and the intelligent high-frequency radiation apparatus, .

As described above, the radio frequency identification system for communicating between the reader tags according to the present invention monitors the communication between the reader and the tag by simply synchronizing with the channel of the hopped frequency of the reader among the channels of all frequencies capable of frequency hopping of the reader The communication relay and security between the reader and the tag can be easily performed.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. It is, therefore, to be understood that the above-described embodiments are illustrative in all respects and not as restrictive. The scope of the present invention is defined by the appended claims rather than the foregoing detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be interpreted as being included in the scope of the present invention .

Claims (15)

Many readers, A plurality of tags, A channel synchronizer including a channel of all frequency bands capable of frequency hopping by the reader and performing wireless communication in synchronization with the hopped frequency of the reader; And a high-frequency radiation device communicating between the reader and the tag by transmitting a high-frequency power, which is a power supply of the tag, to the tag after storing the RF signal of the channel synchronizing device. system. [2] The apparatus of claim 1, wherein the channel synchronization device is formed integrally with the high-frequency radiation device, receives an RF signal of the reader through a coherent frequency channel according to a hopping frequency of the reader among the plurality of channels, And the RFID tag is supplied to the high-frequency radiation device.  The RFID reader according to claim 1, wherein the channel synchronization device radiates an RF signal, which does not include information on the same channel as the channel of the RF signal of the received reader, into a plurality of tags. Recognition system. 2. The apparatus of claim 1, antenna; A switching unit switched according to a control signal supplied from the outside to pass an RF signal of a reader received through the reader sensing antenna; A receiving low noise amplifier for filtering and amplifying noise included in the RF signal passed through the switching unit; A channel synchronization unit for passing an output signal of the low noise amplifier through a frequency channel and a coherent frequency channel of an RF signal transmitted through the low noise amplifier among all communicable frequency channels; A power supply unit for passing external power according to a control signal supplied from the outside; And a transmission power amplifier for amplifying a high frequency provided through the same channel as a channel that has passed through the output signal of the low noise amplifier according to an external power supply of the power supply unit and transmitting the amplified high frequency to the tag through the antenna. - A radio frequency identification system communicating between tags. 5. The reader as claimed in claim 4, wherein the switching unit comprises an inverter for inverting a control signal supplied from the outside, and a switch for switching an RF signal received through the antenna to be switched according to an output signal of the inverter - Radio frequency identification system for communication between tags. 5. The communication device as claimed in claim 4, wherein the power supply unit is provided as a power switch that is switched according to a control signal supplied from the outside, Recognition system. 7. The radio frequency identification system according to any one of claims 4 to 6, wherein the RF signal passing through the transmitting power amplifier is a pure continuous signal having no information. Many readers, A plurality of tags, A channel selection device including channels of all frequency bands capable of frequency hopping by the reader and performing wireless communication in synchronization with the hopped frequency of the reader, An intelligent high frequency radiation device for storing an RF signal of the channel synchronizing device, transmitting a high frequency power, which is a power supply of the tag, to a tag, collecting information of the tag, and supplying collected information to a reader through a channel synchronizer Wherein the reader / writer is configured to communicate with the RFID reader / writer. The radio frequency identification system according to claim 8, wherein the channel synchronizing device is formed integrally with an intelligent high frequency radiation device. The apparatus of claim 8, wherein the channel synchronization device receives an RF signal of a reader through a coherent frequency channel according to a hopping frequency of the reader among the plurality of channels and supplies the RF signal to the intelligent high- A radio frequency identification system for communicating between reader-tags. 9. The apparatus of claim 8, wherein the channel synchronization device is a pure continuous wave that does not include information on the same channel as the channel of the RF signal of the received reader, or that the RF signal replaces the response signal of the tag to a plurality of tags A reader-tag communicating with the RFID reader / writer. 12. The apparatus as claimed in any one of claims 8 to 11, Reader monitoring antenna; A switching unit switched according to a control signal supplied from the outside to pass an RF signal of a reader received through the reader sensing antenna; A receiving low noise amplifier for filtering and amplifying noise included in the RF signal passed through the switching unit; A channel synchronization unit for passing an output signal of the low noise amplifier through a frequency channel and a coherent frequency channel of an RF signal transmitted through the low noise amplifier among all communicable frequency channels; A power supply unit for passing external power according to a control signal supplied from the outside; And And a transmitting power amplifier for amplifying a high frequency provided through the same channel through a channel that has passed through the output signal of the low noise amplifier according to an external power supply of the power supply unit and transmitting the amplified high frequency to the tag through the reader monitoring antenna A reader-tag communicating with the RFID reader / writer. The RFID reader according to claim 12, wherein the switching unit comprises an inverter for inverting a control signal supplied from the outside, and a switch for switching an RF signal received through the reader monitoring antenna in accordance with an output signal of the inverter A reader-tag communicating with the RFID reader / writer. 13. The radio frequency identification system according to claim 12, wherein the power supply unit is provided as a power switch that is switched according to a control signal supplied from the outside and supplies power to the power amplifier through a power supply, . 14. The radio frequency identification system according to claim 12, wherein the RF signal passing through the transmitting power amplifier is a pure continuous wave having no information or an RF signal replacing a response signal of the tag.

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