KR20130129764A - An appratus for transmitting wireless frequency signals for communicating with a wireless tag, a method for transmitting it and an appratus for reading wireless tag comprising it - Google Patents

An appratus for transmitting wireless frequency signals for communicating with a wireless tag, a method for transmitting it and an appratus for reading wireless tag comprising it Download PDF

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Publication number
KR20130129764A
KR20130129764A KR1020120053860A KR20120053860A KR20130129764A KR 20130129764 A KR20130129764 A KR 20130129764A KR 1020120053860 A KR1020120053860 A KR 1020120053860A KR 20120053860 A KR20120053860 A KR 20120053860A KR 20130129764 A KR20130129764 A KR 20130129764A
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South Korea
Prior art keywords
frequency
signal
wireless tag
antenna
digital signal
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KR1020120053860A
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Korean (ko)
Inventor
임재환
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엘에스산전 주식회사
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Priority to KR1020120053860A priority Critical patent/KR20130129764A/en
Publication of KR20130129764A publication Critical patent/KR20130129764A/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/005—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
    • H04B1/0064—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with separate antennas for the more than one band
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/02—Transmitters
    • H04B1/04—Circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/10—Frequency-modulated carrier systems, i.e. using frequency-shift keying

Abstract

The embodiment of the present invention relates to a wireless frequency signal transmitter for communicating with a wireless tag, and the wireless frequency signal transmitter comprises a protocol processor for processing a protocol by receiving a digital signal in order to transmit the digital signal to the wireless tag; a digital signal processor capable of generating a sub-carrier for the processed signal; a modulation unit for modulating the generated sub-carrier into a first frequency; and a switch unit for selecting the transmission path of the modulated first frequency signal according to the selected operation mode. [Reference numerals] (101) First antenna;(102) Second antenna;(110) Signal processing unit;(200) Wireless tag reading unit

Description

An apparatus for transmitting radio frequency signals for communication with a wireless tag, a method of transmitting the same, and a wireless tag reading apparatus including the same, and a wireless tag reading apparatus including the same. TAG COMPRISING IT}

The present invention relates to a radio frequency signal transmission apparatus, a transmission method thereof, and a radio tag reading apparatus including the same, and more particularly, to a radio frequency signal transmission apparatus supporting multiple frequency bands, a transmission method thereof, and a radio tag reading including the same. Relates to a device. More specifically, the present invention relates to a radio frequency signal transmission apparatus capable of supporting multiple frequency bands while minimizing hardware cost, a transmission method thereof, and a wireless tag reading apparatus including the same.

In general, a wireless tag receives a radio frequency signal transmitted from a wireless tag reader and sends a response to the wireless tag reader. By using this, it is possible to track and manage the unique identification information of the tag. Such wireless tag technology may use a short range wireless communication technology such as WIFI, RFID, NFC, and the like.

In particular, for example, a typical RFID technology using a radio tag is a radio-frequency tag that can be tagged, by contactless reading or recording information from a tag having unique identification information, It is a technology to recognize, track and manage animals and humans.

In other words, RFID technology refers to a technology that uses RFID to recognize information from a long distance. RFID tags and RFID readers are needed to implement RFID technology. The above-mentioned RFID tag is composed of an antenna and an integrated circuit, which records information in an integrated circuit and transmits information to the reader through an antenna.

This information is used to identify the tagged object, and is simply a function similar to a bar code. RFID differs from bar code system in that it uses electric waves instead of reading light. Thus, it does not work at short distances like a barcode reader, it can read tags from a long distance, or even receive information through objects between objects and objects.

The above RFID system using RFID technology has unique identification information, and is composed of a plurality of tags (electronic tags or transponders) attached to objects or animals, and an RFID reader (reader or interrogator) for reading or writing tag information The configuration is as described above.

At this time, the RFID system is divided into a mutual induction method and an electromagnetic wave method according to a mutual communication method between a reader and a tag, and is divided into an active type and a passive type according to whether the tag operates by its own power. Medium wave, short wave, microwave, and microwave.

In this way, the RFID that reads and communicates information of the chip only by the power of the reader is referred to as a passive RFID. Semi-passive RFID refers to the use of the power of the reader to read information from the chip, and the power of the reader to communicate with the battery because the tag is embedded in the tag. Finally, active RFID reads the information of the chip and uses the power of the tag to communicate the information.

The RFID system also divides the RFID into frequencies of radio waves used for communication instead of power. RFID, which uses low frequencies, is called LFID (Low-Frequency IDentification) and uses radio waves of 120 to 140 kilohertz (kHz).

High-Frequency IDentification (HFID) uses 13.56 MHz (Mhz), and UHFID (Ultra High-Frequency IDentification), which uses higher frequency, uses radio waves in the 868-956 MHz (approximately 900 MHz) band. .

FIG. 1 is a diagram illustrating a general configuration of a multi-frequency radio tag reader transceiver for supporting the frequencies of various radio waves.

As shown in FIG. 1, a transceiver of a general wireless tag reader supporting multiple frequencies includes a first frequency (for example, 13.56Mhz) band antenna 11, a first coupler 12, and a first power amplifier 13. , A first modulator 14, a first demodulator 15, a second frequency (eg, 900 MHz) band antenna 21, a second coupler 22, a second power amplifier 23, a second modulator ( 24), the second demodulator 25 and the protocol processor 30 are configured.

The protocol processor 30 receives a signal for wireless tag reading, performs protocol processing, and transmits the signal to the first modulator 14 or the second modulator 24 according to the set frequency bandwidth, and each modulator 14, 24. Modulates the transmitted signal into a preset 13.56Mhz band or 900Mhz frequency band. Each of the power amplifiers 13 and 23 amplifies the modulated signal, and transmits a frequency signal coupled to a predetermined voltage through the corresponding coupler 12 and 22 through each antenna 11 and 21. Each demodulator 15, 25 performs demodulation on the read response signal of the radio tag corresponding to each frequency bandwidth received through each antenna 11, 21 and transmits the demodulator 15 to the protocol processor 30.

As described above, in the case of a wireless tag reader having a transceiver, separate RF equipment including a separate modulator, a voltage amplifier, and a demodulator is required for each supported frequency.

However, the separate wireless RF equipment requires an oscillator for each frequency, for example, 13.56Mhz and 900Mhz, and there is a problem in that cost and volume according to various components increase as the supporting frequency increases.

In addition, in order to support additional frequency bands with the hardware signal processing method, it is difficult to add another hardware.

An object of the present invention is to provide a radio frequency signal transmission apparatus capable of minimizing volume and hardware cost while supporting multiple frequencies, a transmission method thereof, and a wireless tag reading apparatus including the same.

In addition, the present invention provides an efficient radio frequency signal transmission apparatus, a transmission method thereof, and a wireless tag reading apparatus including the same because multi-frequency can be supported without adding additional hardware.

A radio frequency signal transmission apparatus according to an embodiment of the present invention for achieving the above object, in a radio frequency signal transmission apparatus for communication with a radio tag, receives a digital signal for transmission to the radio tag to perform protocol processing A protocol processing unit to perform; A digital signal processor for generating a subcarrier for the protocol processed signal; A modulator for modulating at a first frequency based on the generated subcarrier; And a switch unit for selecting a transmission path of the first frequency modulated signal according to the selected operation mode.

In addition, the wireless tag reading apparatus according to an embodiment of the present invention for achieving the above object, in the wireless tag reading apparatus for transmitting a signal to the wireless tag, receiving and reading the response, for transmitting to the wireless tag A wireless tag reader for generating a digital signal; A protocol processing unit which receives the digital signal generated from the wireless tag reading unit and performs protocol processing; A digital signal processor for generating a subcarrier for the protocol processed signal; A modulator for modulating at a first frequency based on the generated subcarrier; A switch unit selecting a transmission path of the first frequency modulated signal according to a selected operation mode; And an antenna unit configured to form a transmission path of the modulated signal as one of a first path and a second path according to the switch unit.

In addition, the radio frequency signal transmission method according to an embodiment of the present invention for achieving the above object, in the radio frequency signal transmission method for reading a radio tag of the radio frequency signal transmission apparatus, the frequency band supported by the radio tag Selecting an operation mode according to; Generating a digital signal for transmission to the wireless tag; Performing protocol processing on the generated signal; Generating a subcarrier for the protocol processed signal; Modulating at a first frequency based on the generated subcarrier; And selecting a transmission path of the first frequency modulated signal according to the selected operation mode.

According to an embodiment of the present invention, the wireless tag reader can support multiple frequencies without having to provide separate individual hardware equipment.

In particular, it is possible to generate a frequency band subcarrier set using a digital signal processor, and to filter it and transmit it to various frequency bands.

In addition, according to an embodiment, the supportable frequency band can be changed without adding or changing hardware.

1 is a block diagram illustrating a transceiver of a general wireless tag reading apparatus.
2 is a block diagram schematically illustrating an apparatus for reading a radio tag including an apparatus for transmitting a radio frequency signal according to an embodiment of the present invention.
3 is a block diagram illustrating in detail a radio frequency signal transmission apparatus according to an embodiment of the present invention.
4 is a block diagram illustrating an apparatus for transmitting radio frequency signals according to another embodiment of the present invention.
5 is a flowchart illustrating a radio frequency signal transmission method according to an embodiment of the present invention.
6 is a flowchart illustrating a radio frequency signal transmission method according to another embodiment of the present invention.

The following merely illustrates the principles of the invention. Thus, those skilled in the art will be able to devise various apparatuses which, although not explicitly described or shown herein, embody the principles of the invention and are included in the concept and scope of the invention. Furthermore, all of the conditional terms and embodiments listed herein are, in principle, intended only for the purpose of enabling understanding of the concepts of the present invention, and are not intended to be limiting in any way to the specifically listed embodiments and conditions .

It is also to be understood that the detailed description, as well as the principles, aspects and embodiments of the invention, as well as specific embodiments thereof, are intended to cover structural and functional equivalents thereof. It is also to be understood that such equivalents include all elements contemplated to perform the same function irrespective of the currently known equivalents as well as the equivalents to be developed in the future, i.e., the structure.

Thus, for example, it should be understood that the block diagrams herein represent conceptual views of exemplary circuits embodying the principles of the invention. Similarly, all flowcharts, state transition diagrams, pseudo code, and the like are representative of various processes that may be substantially represented on a computer-readable medium and executed by a computer or processor, whether or not the computer or processor is explicitly shown .

The functions of the various elements shown in the figures, including the functional blocks depicted in the processor or similar concept, may be provided by use of dedicated hardware as well as hardware capable of executing software in connection with appropriate software. When provided by a processor, the functions may be provided by a single dedicated processor, a single shared processor, or a plurality of individual processors, some of which may be shared.

Also, the explicit use of terms such as processor, control, or similar concepts should not be interpreted exclusively as hardware capable of running software, and may be used without limitation as a digital signal processor (DSP) (ROM), random access memory (RAM), and non-volatile memory. Other hardware may also be included.

In the claims hereof, the elements represented as means for performing the functions described in the detailed description include all types of software including, for example, a combination of circuit elements performing the function or firmware / microcode etc. , And is coupled with appropriate circuitry to execute the software to perform the function. It is to be understood that the invention defined by the appended claims is not to be construed as encompassing any means capable of providing such functionality, as the functions provided by the various listed means are combined and combined with the manner in which the claims require .

BRIEF DESCRIPTION OF THE DRAWINGS The above and other objects, features and advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings, in which: There will be. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

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

2 is a block diagram schematically illustrating a wireless tag reading apparatus 300 including a radio frequency signal transmitting apparatus 100 according to an embodiment of the present invention.

Referring to FIG. 2, the radio tag reader 300 according to an embodiment of the present invention includes a radio frequency signal transmission device 100 and a radio tag reader 200, and a radio frequency signal transmission device 100. Includes a first antenna 101, a second antenna 102, and a signal processor 110.

The wireless tag reader 300 generates a signal for reading a wireless tag, transmits the signal to the signal processor 110, receives the response signal from the signal processor 110, and reads the wireless tag that transmits the response signal. The response signal received from the wireless tag is identification information of the wireless tag and may include RFID tag identification information for identifying a product, an animal, an object, and the like.

The signal processing unit 110 receives a signal for reading a wireless tag from the wireless tag reading unit 300 and performs a protocol processing or a modulation process to operate the first antenna 101 or the second antenna 102 according to a frequency operation mode. Sends via wireless tag located nearby. In particular, the signal processor 110 modulates the wireless tag read signal into a first frequency or a second frequency according to a frequency operation mode through a digital signal processor and a protocol processor, which will be described later. The transmission may be performed through the second antenna 102.

Here, the first frequency or the second frequency may be 13.56 MHz or 900 MHz, which is an RFID standard transmission frequency, according to a wireless tag transmission scheme. In addition, according to an embodiment, it may include a radio frequency of 2.5GHz according to the frequency transmission scheme. According to an embodiment of the present invention, the frequency operation mode may include a frequency operation mode between 13.56Mhz and 900Mhz, but the scope of the present invention is not limited or limited according to the frequency value.

3 is a block diagram illustrating in detail the apparatus 100 for transmitting radio frequency signals according to an embodiment of the present invention.

Referring to FIG. 3, the apparatus 100 for transmitting radio frequency signals according to an embodiment of the present invention includes a protocol processor 111, a digital signal processor 112, a modulator 113, an amplifier 114, and a switch unit. 115, a low pass filter 116, a first antenna 101, and a second antenna 102.

The protocol processor 111 receives a digital signal generated from the wireless tag reader 200 and performs a process according to a communication protocol. For example, the protocol processor 111 may perform encoding processing according to a communication protocol on the received digital signal. The digital signal received by the protocol processor 111 and processed by the protocol may be a signal generated by the wireless tag reader 200 to communicate with the wireless tag, and may include an identification information request signal transmitted to read the wireless tag. It may be.

On the other hand, the digital signal processor 112 generates a subcarrier for each frequency band of the protocol-processed signal. To this end, the digital signal processor 112 may include a DSP (Dgital Signal Processor) circuit. The DSP may include an integrated circuit for quickly processing a digital signal, and the digital signal processor 112 may generate a subcarrier signal for each frequency band based on the digital signal processed by the DSP using such a DSP. have.

The modulator 113 performs modulation, that is, modulation, based on the subcarrier generated by processing the digital signal. The modulator 113 modulates the above-described subcarriers at a first frequency for transmission, for example, a high frequency of 900 MHz. The modulation scheme may be an amplitude shift keying (ASK) scheme that changes a magnitude of a frequency to be transmitted wirelessly to perform near field communication, such as RFID. The types of ASK schemes are DSB-ASK, There may be a single sideband ASK (SSB-ASK) or a PR-ASK.

The modulator 113 may include an oscillator for generating a first frequency to modulate the digital signal processed subcarriers according to the first frequency. Here, since the first frequency may be a high frequency of 900Mhz, the oscillator may be a high frequency oscillator generating a frequency of 900Mhz. As such, in order to generate a frequency signal of a band that the radio frequency signal transmission apparatus 100 can support, the first frequency, which is a reference frequency modulated by the modulator 113, preferably has a higher frequency than the second frequency to be described later. In addition, in the embodiment of the present invention, the modulator 113 may modulate the digital signal processed subcarrier according to the frequency of 900Mhz as described above.

Meanwhile, the amplifier 114 amplifies the power of the first frequency modulated signal and transfers the power to the switch 115. The amplifier 114 may include a power amplifier PA for this purpose, and the power amplifier may include a voltage amplifier circuit or a current amplifier circuit. In addition, the amplified signal is transmitted to the switch unit 115 as a signal that can be transmitted through the antenna.

In addition, the switch 115 connects the circuit such that the output of the amplifier 114 is transmitted to either the first antenna 101 or the low pass filter 116 according to the set operation mode.

The operation mode set in the switch 115 may be either the first frequency operation mode or the second frequency operation mode. The first frequency operation mode or the second frequency operation mode may be changed according to a user's setting, or may be changed according to a preset condition.

In addition, according to an embodiment, the radio frequency signal transmission apparatus 100 may be connected to the switch unit 115 and further include an operation mode determination unit (not shown) for determining a frequency operation mode. Here, the operation mode determination unit detects the frequency signal received by the first antenna 101 or the second antenna 102 to determine the operating frequency bandwidth of the current wireless tag, and accordingly determines the frequency operation mode, accordingly the switch The operation of the unit 115 may be controlled.

In addition, in the first frequency operation mode according to the operation mode, the output of the amplifier 114 delivered to the first antenna 101 may be transmitted to a wireless tag located in the vicinity.

In addition, according to the operation mode, the output of the amplifier 114 is connected to the low pass filter 116 in the second frequency operation mode.

The low pass filter 116 performs low pass filtering on the first frequency modulated signal transmitted from the amplifier 114 to extract a frequency modulated signal suitable for the second antenna bandwidth. Since the first frequency-modulated signal output from the amplifying unit 114 includes subcarrier signals of various frequency bands, the low pass filter 116 filters the low-frequency bands among them to be required for the second antenna 102. A frequency signal, for example, a frequency signal of 13.56Mhz band can be extracted.

In addition, the low frequency signal passing through the low pass filter 116 may be transmitted to a wireless tag located around the second antenna 102.

Accordingly, the switch unit 115 may form a path such that the first frequency modulated signal is transmitted through the first antenna 101 as it is in the first frequency operation mode. In addition, the switch unit 115 may form a path such that the second frequency modulated subcarrier signal extracted through the low pass filtering 116 is transmitted through the second antenna 102 in the second frequency operation mode.

Therefore, according to an embodiment of the present invention, multiple frequency transmissions are possible using the same modulator 113 and the low pass filter 116 without additional hardware for frequency modulation.

4 is a block diagram illustrating a radio frequency signal transmission apparatus 100 according to another embodiment of the present invention.

Referring to FIG. 4, the apparatus 100 for transmitting a radio frequency signal according to another embodiment of the present invention includes a protocol processor 111, a digital signal processor 112, a modulator 113, an amplifier 114, and a switch. The unit 115, the low pass filter 116, the first antenna 101 and the second antenna 102, the first coupler 121, the second coupler 122, the first waveform detector 123, and the second The waveform detector 124 and the demodulator 125 are configured.

The apparatus 100 for transmitting a radio frequency signal shown in FIG. 4 may not only transmit a multi band radio frequency signal but also receive a multi band radio frequency signal.

For this purpose, the apparatus 100 for transmitting a radio frequency signal includes each component illustrated in FIG. 3, and includes a first coupler 121, a second coupler 122, a first waveform detector 123, and a second waveform detector. 124, the demodulator 125 may be further included.

The first coupler 121 couples to a predetermined voltage to detect a waveform of the first frequency band signal received by the first antenna 101.

In addition, the second coupler 122 couples to a predetermined voltage to detect a waveform of the second frequency band signal received by the second antenna 102.

The first waveform detector 123 detects a waveform or an envelope with respect to the signal coupled by the first coupler 121 and transmits the waveform or envelope to the demodulator 125.

In addition, the second waveform detector 124 also detects a waveform or an envelope with respect to the signal coupled by the second coupler 122 and transmits the waveform or envelope to the demodulator 125.

The demodulator 125 performs demodulation based on each detected frequency waveform, and outputs the digital signal according to the protocol processor 111. To this end, the demodulator 125 may include a comparator (not shown) and an inverter for receiving a frequency waveform, detecting an average voltage, comparing the average voltage with the frequency waveform, and outputting a pulse signal. Accordingly, the demodulator 125 may recover the response digital signal transmitted by protocol processing from the wireless tag by using the detected frequency waveform.

The protocol processor 111 converts the restored digital signal into a digital signal recognizable by the wireless tag reader 200 by performing reverse protocol processing, for example, decoding.

As such, the radio frequency signal transmission apparatus 100 configured in FIG. 4 receives a plurality of frequency band signals, detects, demodulates, and restores each waveform, so that the wireless tag reading apparatus 300 transmits and receives multiple frequency band signals. Do it. In addition, unlike a general wireless tag reading apparatus, the wireless tag reading apparatus 300 according to an embodiment of the present invention does not require each demodulator or demodulator according to a plurality of frequency band signals, and one demodulator 125 Since it is possible to recover a signal capable of digital signal processing and protocol processing as), according to an embodiment of the present invention it is possible to manufacture a wireless tag reading device 300 with a simple configuration and efficient in terms of cost and volume.

5 is a flowchart illustrating a radio frequency signal transmission method of the radio frequency signal transmission apparatus 100 according to an embodiment of the present invention.

Referring to FIG. 5, first, the wireless tag reader 200 generates a signal to be transmitted to a wireless tag.

The protocol processor 111 receives a signal generated from the wireless tag reader 200 (S100) and performs a protocol process on the received signal (S110). The protocol-processed signal may include a signal encoded according to a communication protocol scheme, and may include an identification information request signal for communication with a wireless tag.

The digital signal processor 112 performs digital signal processing for generating a subcarrier with respect to the protocol-processed signal (S120). The digital signal processor 112 may generate a subcarrier including a signal of multiple frequency bands based on the signal processed by the protocol signal processor 111. To this end, the digital signal processor 112 may include a DSP circuit capable of generating a subcarrier corresponding to a predefined frequency with respect to the input signal. In addition, the generated subcarriers may include signals corresponding to a plurality of frequencies.

The modulator 113 performs modulation or modulation corresponding to the first frequency for transmission based on the generated subcarrier (S130). According to an embodiment, the first frequency may be a high frequency of 900Mhz, and the second frequency may be a low frequency of 13.56Mhz, which is very low than 900Mhz and extracted by low pass filtering as described above.

Then, the amplifier 114 amplifies the voltage of the modulated signal to facilitate transmission (S140).

Thereafter, the switch unit 115 determines whether the current frequency operation mode is the first frequency mode (S150). In the first frequency mode, a path for transmitting an amplified signal to a wireless tag located around the first antenna 101, for example, a 900 MHz band dedicated antenna, is formed. Therefore, in the first frequency mode, the switch unit 115 may form a path through which the first frequency modulated signal is transmitted through the first antenna 101 as it is.

If the current frequency operation mode is not the first frequency mode, the switch unit 115 determines whether the second frequency mode (S155). The switch unit 115 transmits the amplified signal to the low pass filter 116 in the second frequency mode.

The low pass filter 116 extracts the transmission signal of the second frequency by performing low pass filtering on the amplified signal (S165). For example, the second frequency mode may be 13.56Mhz mode, and the low pass filter 116 may perform a low pass filtering on the amplified 900Mhz signal, thereby extracting a signal in the 13.56Mhz band.

The extracted signal is transmitted to a wireless tag located around the second antenna, for example, through an antenna for 13.56Mhz band (S175).

Through the above process, it is possible to transmit a multi-frequency band radio signal without a plurality of separate demodulation device and oscillator.

6 is a flowchart illustrating a radio frequency signal transmission method according to another embodiment of the present invention.

Referring to FIG. 6, first, the first coupler 121 or the second coupler 122 connected to the first antenna 101 and the second antenna 102 is connected to the first antenna 101 and the second antenna 102. Detect the received signal. The first antenna 101 may be an antenna that supports the first frequency band, and the second antenna 102 may be an antenna that supports the second frequency band. In one embodiment, the first antenna 101 may transmit and receive wireless signals in the 900Mhz band, the second antenna 102 may be an antenna capable of transmitting and receiving wireless signals in the 13.56Mhz band.

In addition, when a signal is received through the first antenna 101 or the second antenna 102, the first coupler 121 or the first waveform detector 123 determines whether the received antenna is the first antenna 101. (S210).

When received through the first antenna 101, the received waveform is detected by the first waveform detector 123 (S220). As described above, the first waveform detector 123 removes noise of the first frequency band signal received through the first antenna 101 and detects an envelope or waveform (S230).

On the other hand, when not received through the first antenna 101, the second coupler 122 or the first waveform detector 124 determines whether a signal is received through the second antenna 101 (S215).

In addition, when received through the second antenna 102, the received waveform is detected by the second waveform detector 124 (S225). As in step S220, the second waveform detector 124 removes noise of the second frequency band signal received through the second antenna 102 and detects an envelope or waveform (S225).

The demodulator 125 receives the detected waveform, analyzes the received waveform, generates a demodulated digital pulse signal, and outputs the demodulated digital pulse signal to the protocol processor 111 (S230). The demodulator 125 may generate a square wave pulse signal by comparing the average voltage of the received waveform with the voltage of the received waveform. To this end, the demodulator 125 may include a Schmitt trigger circuit or a positive feedback circuit of a hysteresis scheme.

Meanwhile, the protocol processor 111 restores the generated digital signal to a digital signal recognizable by the wireless tag reader 200 by inverse protocol processing (S240), and the wireless tag reader 200 wirelessly restores the digital signal according to the restored signal. By reading the identification information and the like of the tag (S250), it is possible to identify the animal, object or product to which the wireless tag is currently attached.

By the above-described radio frequency signal transmission method, multiple frequency band transmission and reception using a subcarrier according to digital signal processing is possible.

The above-described radio frequency signal transmission method according to the present invention may be stored in a computer-readable recording medium that is produced as a program for execution in a computer, and examples of the computer-readable recording medium include ROM, RAM, CD- ROMs, magnetic tapes, floppy disks, optical data storage, and the like, and also include those implemented in the form of carrier waves (eg, transmission over the Internet).

The computer readable recording medium may be distributed over a networked computer system so that computer readable code can be stored and executed in a distributed manner. And, functional programs, codes and code segments for implementing the above method can be easily inferred by programmers of the technical field to which the present invention belongs.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It should be understood that various modifications may be made by those skilled in the art without departing from the spirit and scope of the present invention.

100: radio frequency signal transmission device
101: first antenna
102: second antenna
110: Signal processor
111: protocol processing unit
112: digital signal processing unit
113: modulator
114: amplification unit
115: switch unit
116: low pass filter
200: wireless tag reader
300: wireless tag reader

Claims (10)

In the radio frequency signal transmission apparatus for communication with a radio tag,
A protocol processing unit for receiving a digital signal for transmission to the wireless tag and performing protocol processing;
A digital signal processor for generating a subcarrier for the protocol processed signal;
A modulator for modulating at a first frequency based on the generated subcarrier; And
And a switch unit for selecting a transmission path of the first frequency modulated signal according to a selected operation mode. The method of claim 1,
And the switch unit transmits the first frequency modulated signal through a first antenna when a first frequency mode is selected. The method of claim 1,
And a filtering unit configured to filter the first frequency modulated signal received from the switch unit, extract a second frequency modulated signal, and transmit the extracted signal through a second antenna.
And the switch unit transmits the first frequency modulated signal to the filtering unit when the second frequency mode is selected. The method of claim 1,
A first antenna for receiving a first frequency signal from a first wireless tag using a first frequency band;
A second antenna for receiving a second frequency signal from a second wireless tag using a second frequency band;
At least one waveform detector for detecting a frequency waveform according to each of the received signals; And
And a demodulator for demodulating the detected waveform and outputting a demodulated digital signal. 5. The method of claim 4,
And the protocol processor recovers the signal transmitted from the tag by performing inverse protocol processing on the demodulated digital signal. A wireless tag reading apparatus for transmitting a signal to a wireless tag and receiving and reading the response,
A wireless tag reader for generating a digital signal for transmission to the wireless tag;
A protocol processing unit which receives the digital signal generated from the wireless tag reading unit and performs protocol processing;
A digital signal processor for generating a subcarrier for the protocol processed signal;
A modulator for modulating at a first frequency based on the generated subcarrier;
A switch unit selecting a transmission path of the first frequency modulated signal according to a selected operation mode; And
And an antenna unit configured to form a transmission path of the modulated signal as either a first path or a second path according to the switch unit. The method according to claim 6,
The switch unit selects a first path when a first frequency mode is selected,
And the antenna unit transmits the first frequency modulated signal through a first antenna when a first path is selected. The method according to claim 6,
The antenna unit further includes a filtering unit for extracting a second frequency modulated signal by filtering the first frequency modulated signal received from the switch unit,
The switch unit selects the second path when the second frequency mode is selected,
And the antenna unit extracts the second frequency modulated signal from the first frequency modulated signal through the filtering unit and transmits the second frequency modulated signal through the second antenna when the second path is selected. The method according to claim 6,
At least one antenna for receiving, according to each band, a frequency signal of a plurality of frequency bands received from at least one wireless tag located at a periphery;
At least one waveform detector for detecting a frequency waveform from each band signal received through the at least one antenna; And
A demodulator for demodulating the detected waveform and outputting a demodulated digital signal;
And the protocol processor recovers the signal transmitted from the tag by performing inverse protocol processing on the demodulated digital signal. 10. The method of claim 9,
And the wireless tag reader reads the wireless tag according to the restored signal.

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