KR20070115130A - Reader of rfid system having multi frequency and multi protocol - Google Patents

Abstract

A reader for an RFID system having multiple frequencies and protocols is provided to offer compatibility for a plurality of frequencies/protocols by receiving signals of all frequency channels and selecting one RF signal of one frequency band according to an external command signal. An antenna receives the signal of a plurality of frequency channels. A signal receiving unit includes a plurality of signal receivers, and demodulates the signal by receiving the signal of each frequency band among the received signals and mixing the received signal with the frequency used in a PLL(Phase Locked Loop). A digital signal processor selects the signal receiver receiving the RF signal of a tag among demultiplexed data according to the external command signal and outputs the selected demultiplexed data. A controller transmits the demodulated data to a terminal by using the WLAN(Wireless Local Area Network), the Ad-hoc network, or the WiBro(Wireless Broadband) network.

Description

READER OF RFID SYSTEM HAVING MULTI FREQUENCY AND MULTI PROTOCOL

1 is a view showing the configuration of a general radio frequency recognition system.

2 is a diagram illustrating a configuration of a radio frequency recognition system to which the present invention is applied.

3 is a view showing the configuration of a reader device of a radio frequency recognition system according to the present invention.

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

100: reader 10: signal receiving unit

20: digital signal processing unit 30: control unit

40: display control unit 50: display unit

300: tag

The present invention relates to a reader device of a radio frequency recognition system having multiple frequencies and multiple protocols, and more particularly, a tag selected according to a command signal supplied from an external source among signals of all communicable frequency channels received through an antenna. By demodulating a signal, an apparatus is provided so as to be compatible with multiple frequencies and multiple protocols.

In general, Radio Frequency IDentification (RFID) inputs identification information unique to the smallest IC chip and uses RF to recognize, track, and manage the object or animal to which the chip is attached. Says technology. Such an RFID system is composed of an RFID tag (Tag or Transponder) to which unique identification information is input and attached to an object or animal, and a reader (Reader or Interrogator) to read or write the identification information of the tag without contact. An information processing apparatus such as a computer is connected to the reader to process data collected from a tag.

1 is a block diagram showing the basic configuration of an RFID system according to the prior art. As shown therein, the tag 5 consists of a small semiconductor IC chip and an antenna, in which an RF circuit, logic, and memory are embedded. 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 signal.

That is, the plurality of readers 1 transmit RF signals of a predetermined frequency band including a high frequency carrier signal and a predetermined question signal. When the tag 5 is located in the electromagnetic field of the reader 1 formed by the RF signal, the tag 5 receives the operating power required to operate 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 AC in the antenna of the tag, and the generated AC is rectified and used as electric energy for the IC chip. In addition, the tag 5 modulates the received RF signal and reflects the data stored in the tag 5 based on the received RF signal, and transmits the response signal to the reader 1 as a response signal. As described above, the conventional RFID system performs power transmission for activating the tag 5 as well as transmitting information between the reader 1 and the tag 5.

In the communication between the reader 1 and the tag 5 of such a radio frequency recognition system, the frequency band used usually uses 12.5 KHz, 134 KHz, 13.56 MHz, 433.92 MHz, 900 MHz, or 2.46 GHz.

That is, in a multi-environment in which a reader and a plurality of tags are communicated in such one cell, the reader 1 of the radio frequency recognition system is provided with a tag supplied only in one preset frequency band f _{1 of} the tag 5. Since it is designed to receive an RF signal, it is impossible to receive the RF signal of the tag 5 by the reader 1 when the use frequency band of the tag 5 and the use frequency band of the reader 1 are different. For example, when the radio frequency recognition system designed for the communication frequency between the reader 1 and the tag 5 is 13.56 MHz, the reader device moves to an area where the tag communicates at 900 MHz, the reader 1 and the tag ( 5) Communication between them was not possible.

The present invention is proposed to solve the above problems, and an object of the present invention is to receive an RF signal of one frequency band tag according to a command signal supplied from the outside after receiving signals of all available frequency channels. The purpose of the present invention is to provide a reader device of a radio frequency recognition system having a multi-frequency and a multi-protocol that can be compatible with multi-frequency and multi-protocol.

Another object of the present invention is to transmit and display demodulated data processed through a digital signal processing unit of a radio frequency recognition system to a corresponding terminal through a supported protocol, thereby enabling the radio frequency recognition system to be compatible with various communication networks. An object of the present invention is to provide a reader device for a radio frequency recognition system having a frequency and multiple protocols.

Technical means according to the present invention for achieving this object,

In the radio frequency recognition system for communicating the RF signal between the reader and the tag,

An antenna for receiving signals in a plurality of frequency bands;

A signal receiver provided with a plurality of signal receivers, for receiving a signal of each corresponding frequency band among the signals of the plurality of frequency bands received through the antenna, and mixing and demodulating the signal with a frequency used for the phase locked loop;

A digital signal processor which selects the signal receiver in which the RF signal of the tag is received according to a command signal supplied from the demodulation data of the signal receiver and outputs demodulated data of the selected signal receiver; And

And a control unit for supporting demodulated data of the digital signal processor and transmitting the demodulated data to the corresponding terminal using one of a wireless local area network, an Ed Hawk communication network, and a WiBro, wherein the signal receiving unit includes 12.5KHz, 134KHz, 13.56 MHz, 433.92 MHz, 900 MHz, and 2.46 GHz respectively.

The apparatus may further include a display control unit which is connected to the control unit through a cable and processes the demodulated data to be displayed on the screen and displays the demodulated data.

The command signal is characterized in that it is generated according to the user's selection,

The command signal may be generated according to an analysis result after analyzing a plurality of frequency channels received through an antenna.

The terminal may be displayed after processing the demodulated data received on the screen using a protocol that can be supported by the controller.

Herein, the corresponding terminal is one of a mobile terminal, a GPS receiver, and a Zigbee receiver.

On the other hand, the reader device is characterized in that it is provided to be protected against moisture supplied from the outside.

According to the present invention, after receiving the signals of all available frequency channels, by selecting the RF signal of the tag of one frequency band according to the command signal supplied from the outside, it can be compatible for multiple frequencies and multiple protocols, By transmitting and displaying the digitally processed demodulation data to the corresponding terminal through the protocol of the corresponding communication network, the radio frequency recognition system can be compatible with various communication networks.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings in order to describe the present invention in detail so that those skilled in the art can easily carry out the present invention. .

2 is a view showing the configuration of a reader of a radio frequency recognition system to which the present invention is applied, and FIG. 3 is a view showing a detailed configuration of the reader 100 shown in FIG. As shown in FIGS. 2 and 3, the reader 100 of the radio frequency recognition system according to the present invention receives signals of a plurality of frequency bands f ₁ -f _n received through an antenna ANT. A signal receiver 10 for outputting a signal of a frequency band, a digital signal processor 20 connected to an output side of the signal receiver 10, and a controller 30 connected to an output side of the digital signal processor 20; It includes.

Here, the antenna ANT is provided to receive signals transmitted in a plurality of frequency bands f ₁ -f _n . Here, the plurality of frequency bands f ₁ -f _n are 12.5 KHz, 134 KHz, 13.56 MHz, 433.92 MHz, 900 MHz, and 2.46 GHz.

In addition, the signal receiver 10 includes a plurality of signal receivers, and each signal receiver is provided to output a signal of a corresponding frequency band among the plurality of frequency bands f ₁ -f _n .

Each signal receiver includes a band pass filter (BPF) 11 for receiving a signal received through the antenna ANT and outputting a signal having a predetermined frequency band, and included in the output signal of the BPF 11. A low noise amplifier (LNA) 12 that removes noise components and amplifies the signal to a predetermined level, and an analog / digital converter that mixes and demodulates the output signal of the LNA 12 with a frequency used for the phase locked loop. 13).

Meanwhile, the digital signal processor 20 is configured to output demodulated data of a signal receiver to which an RF signal of a tag is output among demodulated data of the analog / digital converter 13 of each signal receiver according to a command signal supplied from the outside. do.

Here, the command signal is provided to be generated by the user among the output data of the plurality of signal receivers.

The digital signal processor 20 according to an embodiment of the present invention demodulates the demodulated data by demodulating the output data of the signal receiver outputting the RF signal of the tag among the output data of the plurality of signal receivers according to the command signal selected by the user. The signal receiver is provided to search signals received through each frequency band at predetermined time intervals and output RF signals of tags among output data of a plurality of signal receivers according to command signals generated according to the search results. And demodulate the demodulated data by demodulating the output data.

The control unit 30 is provided to be supplied to the mobile terminal through a mobile communication network to transmit the received demodulation data. In this case, the controller 30 includes a protocol supported for supplying demodulation data to the mobile terminal through the mobile communication network.

In an embodiment of the present invention, demodulated data of the digital signal processor 20 is provided to be transmitted to a mobile terminal through a mobile communication network, but may be provided to be transmitted to a corresponding terminal through an Ed Hawk communication network, a WiBro, a wireless local area network, or the like. In this case, the controller 30 includes a corresponding protocol, and the corresponding terminal includes a GPS or a Zigbee receiver.

In addition, the reader 100 according to the present invention is supplied from the display control unit 40 and the display control unit 40 which are processed to display demodulation data of the digital signal processing unit 20 on the screen under the control of the control unit 30. The display unit 50 further includes a display unit 50 to display the image data on the screen.

The display control unit 40 is provided with an already known accelerator, and is provided to variously adjust the size of the screen through a scaling process of the accelerator, and a detailed description of the above process will be omitted.

In the reader 100 of the radio frequency recognition system having a multi-frequency and multi-protocol according to the present invention having the above configuration, the signal of a plurality of frequency bands (f _1- f _n ) is the antenna (ANT) and the signal receiving unit Receive through 10.

That is, the signals of the plurality of frequency bands f ₁ -f _n are supplied to the BPFs 11 of the respective signal receivers of the signal receiver 10, and the BPFs 11 receive signals of the antennas. The RF signal of the predetermined frequency band passes.

The output signal of the BPF 11 is supplied to the LNA 12, and the LNA 12 removes the noise component included in the RF signal and amplifies the signal to a predetermined level to the analog / digital converter 13. Supply. The analog-to-digital converter 13 demodulates the output signal of the LNA 12 by mixing with the frequency used for the phase locked loop, and the demodulated data is supplied to the digital signal processor 20.

Demodulation data of the plurality of signal receivers is supplied to the digital signal processor 20 through the above process.

The digital signal processor 20 outputs demodulation data selected by the user among demodulation data of the plurality of signal receivers according to a command signal generated according to the user's will.

Although the digital signal processing unit 20 according to the embodiment of the present invention has been described to output the output data of the signal receiver in which the RF signal of the tag is received according to the user's selection among the output data of the plurality of signal receivers, Search the signals of all the frequency bands received through and generate a command signal for selecting the output data of the signal receiver received the RF signal of the tag according to the search result, and according to the generated command signal The RF signal may output the output data of the received signal receiver.

The output data of the digital signal processor 20 is supplied to the controller 30.

The control unit 30 transmits the received demodulated data to the mobile terminal through a mobile communication network using a protocol that can support the demodulated data, and the demodulated data is displayed on the screen. That is, it is possible to check the RF signal of the tag through the mobile terminal.

Although the mobile terminal has been described as an example to receive and display demodulated data transmitted through a wired / wireless communication network in an exemplary embodiment of the present invention, the demodulated data may be supported by the hawk, network, WiBro, and the like. It may be transmitted to the corresponding terminal through a protocol of the local area network. In this case, the corresponding terminal processes the demodulated data received using a protocol that can be supported by the controller to be displayed on the screen and displays the demodulated data on the screen.

The display control unit 40 connected to the control unit 20 via a cable processes the received demodulation data to be displayed on the screen, and the processed image data may be displayed on the screen through the display unit 50.

As described above, a reader device of a radio frequency recognition system having a multi-frequency and a multi-protocol according to the present invention includes a command signal supplied from the outside of a plurality of signal receivers each receiving signals of all frequency bands available through an antenna. By selecting one signal receiver that receives the RF signal of the tag according to the present invention, it is compatible with multiple frequencies and multiple protocols, and transmits and displays digitally processed demodulated data to the corresponding terminal through the corresponding protocol. The effect is that the recognition system can be compatible with various communication networks.

What has been described above is only one embodiment for implementing the reader device of the radio frequency identification system according to the present invention, the present invention is not limited to the above embodiment, as claimed in the following claims Without departing from the gist of the invention, anyone of ordinary skill in the art to which the present invention will have the technical spirit of the present invention to the extent that various modifications can be made.

Claims (8)

In the radio frequency recognition system for communicating the RF signal between the reader and the tag, An antenna for receiving signals in a plurality of frequency bands; A signal receiver provided with a plurality of signal receivers, for receiving a signal of each corresponding frequency band among the signals of the plurality of frequency bands received through the antenna, and mixing and demodulating the signal with a frequency used for the phase locked loop; A digital signal processor which selects the signal receiver in which the RF signal of the tag is received according to a command signal supplied from the demodulation data of the signal receiver and outputs demodulated data of the selected signal receiver; And A radio frequency having a multi-frequency and multi-protocol, comprising a controllable protocol and a control unit for transmitting demodulated data of the digital signal processing unit to a corresponding terminal using one of a wireless local area network, an Ed Hawk communication network, and a WiBro. Reader device in recognition system. The wireless signal receiver of claim 1, wherein the signal receiver comprises a plurality of signal receivers for receiving 12.5 KHz, 134 KHz, 13.56 MHz, 433.92 MHz, 900 MHz, and 2.46 GHz, respectively. Reader device of frequency recognition system. The multi-frequency and multi-protocol protocol according to claim 2, wherein the command signal is generated by a user's selection to select the signal receiver in which the RF signal of a tag is received among the plurality of signal receivers. Reader device for radio frequency recognition system. The method of claim 2, wherein the command signal is searched at predetermined time intervals for signals supplied from the plurality of signal receivers in order to select a signal receiver in which an RF signal of a tag is received, and is generated according to a search result. Reader device of a radio frequency recognition system having a multi-frequency and multi-protocol. The multi-frequency and multi-channel according to any one of claims 3 and 4, further comprising a display control unit which is connected to the control unit via a cable and processes the demodulated data to be displayed on the screen and displays the demodulated data. Reader device of a radio frequency identification system having a protocol. The multi-frequency and multi-protocol according to claim 3 or 4, wherein the terminal processes and displays the demodulated data received on the screen using a protocol supported by the controller. The reader device of the radio frequency recognition system having. The reader device of claim 6, wherein the corresponding terminal is one of a mobile terminal, a GPS receiver, and a Zigbee receiver. The reader device of claim 1, wherein the reader device is provided to protect against moisture supplied from the outside.

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