KR101081818B1 - Transmittance/reception separative rfid reader and control method - Google Patents

Abstract

PURPOSE: An RFID(Radio Frequency IDentification) reader and control method thereof are provided to recognize a tag which a user desires. CONSTITUTION: A receiving coupler(30) transfers only the received signal of the transmission-reception antenna to a receiver. A controller(50) is connected to the receiving unit and an RF switch. The controller controls the RF switch according to a receiving result of the receiving unit. A voltage variable unit(40) is connected to the output terminal of the transmission unit.

Description

RF ID reader and control method capable of transmitting and receiving separation {TRANSMITTANCE / RECEPTION SEPARATIVE RFID READER AND CONTROL METHOD}

The present invention relates to an RFID reader and a control method capable of transmitting / receiving separation, and in particular, converting mono-static to bi-static to prevent crosstalk and interference of an RFID reader operating in the UHF band. The present invention relates to a RFID reader and a detachable RFID reader and a control method thereof capable of recognizing only one tag closest to each other.

As is well known, the RFID system that can recognize the information of the object or the tag information for locating at a long distance by using radio waves is widely used in various environments, and the tag and the RFID reader exist only 1: 1 in one space. In the early RFID system, the application of the RFID system has a wide range of applications, such as a metal environment (e.g., an RFID system directly attached to a metal), and RFID systems having several tags or RFID transceivers in one space. As a result, the importance of accuracy of tag recognition and recognition rate is emerging.

As described above, in order to increase the accuracy and recognition rate of the tag recognition, it is important to prevent the interference or interference of the signal when the tag is recognized, and an RFID system having an interference prevention function of the received signal has been proposed. Representative example of the Republic of Korea Patent Publication No. 10-2008-0056555 (Invention name: RFID transmission and reception system capable of preventing interference of the received signal; referred to as 'quotation invention' hereinafter) as shown in Figure 1, the antenna ( 105, transmission / reception separation unit 110, low noise amplifier (LNA) 115, phase synchronization circuit 120, frequency multiplier 125, channel filter 130, the first mixer 140, GA (Gain Amplifier) ) 145, the second mixer 150, the first filter 155, the second filter 160, the demodulator 165, the controller 170, the modulator 175, the third filter 180, and A power amplifier module (PAM) 185 is included.

Here, the antenna 105 is provided as one, not separated according to the transmission and reception signal, and transmits the received signal to the transmission and reception separation unit 110 or radiates the transmission signal transmitted from the transmission and reception separation unit 110 to the atmosphere, At this time, the received signal is a structure that can be received mixed with various interference signals.

Therefore, in the cited invention, the modulator 175 removes the interference signal mixed with the separated received signal after separating using the 25 to 35 dB isolation between the transmission signal and the received signal in the transmission and reception separation unit 110. Multiplying the oscillation frequency signal provided to the second mixer 150 to generate a signal of the harmonic component and convert it into a phase inverted signal by combining it with a received signal mixed with various interference signals received through the antenna 105 In this case, signals that cause interference in demodulation are excluded, thereby preventing interference of a received signal.

However, the cited invention is a transmission and reception separation unit 110, a low noise amplifier (LNA) 115, a phase synchronization circuit 120, a frequency multiplier 125, a channel filter 130, a first mixer 140, GA (Gain Amplifier) 145, second mixer 150, first filter 155, second filter 160, demodulator 165, controller 170, modulator 175, Complex processes such as separating the signals through complex configurations such as the third filter 180, generating signals of harmonic components, synthesizing them, filtering through the filters, and modulating or amplifying the weakened signals through these processes By solving the signal interference problem through the system is complicated, the signal may be lost, there is a problem that the recognition rate is reduced due to the slow processing.

Republic of Korea Patent Publication No. 10-2008-0056555

An object of the present invention is to provide a transmission and reception separation type RFID reader and its control method to increase the recognition rate of the tag at the same time to improve the recognition rate of the tag even in a high cross-talk and interference environment to solve this problem Is in.

In order to achieve the above object, the present invention provides a tag attached to a cylindrical coil that is moved by a tong of a crane, a transmission / reception antenna having a plurality of channels, a transmission unit for transmitting a signal through the transmission / reception antenna, and a signal through the transmission / reception antenna. In the RFID reader configured to receive the information of the tag is configured to receive, the transmitting and receiving antenna is installed in the tongs of the crane, electrically connecting the transmitting and receiving unit of the RFID reader installed in the crane and the transmission and reception antenna RF switch for switching the transmission to be used as either one of the transmission and reception, or only one of the transmission and reception, a reception coupler for transmitting only the reception signal of the transmission and reception antenna to the reception unit, and connected to the reception unit and the RF switch to receive the reception result of the reception unit. Control to control the RF switch And, it is connected to the output terminal of the transmission unit constituted by the hayeoseo voltage variable for varying the output voltage of the transmitter under control of the controller.

In this way, the present invention can be applied to the transmission and reception integrated or separate type according to the interference situation by the controller for determining the reception information of the receiving unit to increase the tag recognition rate and to control the transmission power to control the metal environment or the reader, In the environment where there is a lot of interference of the tag signal, the user can recognize the desired tag accurately. Therefore, the accuracy of the tag recognition can be improved. In addition, the crane can be controlled by adjusting the output voltage of the transmitter in the voltage variable part controlled by the controller. Since the tongs are read only the closest tag information that the user wants to read, the malfunction rate due to unnecessary tag recognition can be reduced, thereby increasing the reliability of the RFID system.

1 is a block diagram showing the configuration of the cited invention.
2 and 3 is a block diagram showing a specific embodiment of the RFID transmitter and reception detachable type according to the present invention.
4 is an explanatory diagram illustrating a steel mill environment to which a RFID transmitter / receiver RFID reader according to the present invention is applied;

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

Figure 2 shows the overall configuration of a specific embodiment of a transmission and reception detachable RFID reader according to the present invention.

As can be seen from the above, the present invention is a transmission and reception antenna 10 having a plurality of channels, a transmission unit 60 for transmitting a signal through the transmission and reception antenna 10, and the signal through the transmission and reception antenna 10 In the RFID reader 5 consisting of a receiving unit 70 for receiving,

An RF switch 20 for switching the transmit / receive antenna 10 to be used as only one of a transmission and a reception;

A reception coupler 30 for transmitting only the reception signal of the transmission / reception antenna 10 to the reception unit 70;

A controller 50 connected to the receiver 70 and the RF switch 20 to control the RF switch 20 according to the reception result of the receiver 70;

The voltage variable unit 40 may be connected to an output terminal of the transmitter 60 to change an output voltage of the transmitter 60 under the control of the controller 50. The voltage variable part 40 may be configured as a variable attenuator.

If you explain this in more detail for each component,

The above-described RF switch 20 switches the first switch 21 for switching the connection of the transmit / receive antenna 10 and another transmit / receive antenna 10 not connected to the first switch 21 to receive only. It may be composed of a second switch 22 and the third switch 23 for channel distribution, when the first switch 21 and the second switch 22 is connected to the transmission and reception antenna 10 when the transmission and reception integral operation The third switch 23 switches to distribute the channel of the transmission / reception antenna 10, and when the transmission / reception is operated, the first switch 21 switches, and the third switch 23 switches the first switch. 21 to connect the antenna connected to the first switch 21 to be used only for transmission, the second switch 22 is connected to the transmitting and receiving antenna 10 in a path connected to the receiving unit 70 to the second switch ( The transmission and reception antenna 10 connected to 22 may be used only for reception.

2, the third switch 23 connects the transmission / reception antenna 10 and the transmission unit 60, but distributes the first antenna 11 and the second antenna 12 of the transmission / reception antenna 10. The first switch 21 switches the first antenna 11 and the third switch 23 of the transmission / reception antenna 10, and the second switch 22 is the second antenna of the transmission / reception antenna 10. 12 and the third switch 23 and the receiver 70 is switched. In order to extend this to four channels, the sixth switch 26 having the same function as the third switch 23, and the fourth switch switching the third antenna 13 and the sixth switch 26 of the transmit / receive antenna 10. Of course, the switch 24 and the fifth switch 25 for switching the connection between the fourth antenna 14 and the sixth switch 26 and the receiver 70 of the transmission / reception antenna 10 may be further configured. .

The first switch 21 is closed when the transmission / reception unit is used to transmit / receive all the channels of the transmission / reception antenna 10 in order to increase the recognition rate of the tag 4. The first port of the antenna 11 and the third switch 23 are connected, and the second switch 22 is connected to the second antenna 12 and the third switch 23 which are the second channels of the transmission / reception antenna 10. The channel of the transmitting and receiving antenna 10 is distributed by switching the third switch 23 by connecting the second port, and the receiving coupler is connected between the third switch 23 of the RF switch 20 and the transmitter 60. 30 is configured to transmit the transmission signal from the transmission unit 60 as it is, and the reception signal received through the transmission and reception antenna 10 is transmitted to the reception unit 70 so that transmission and reception are made.

When two or more tags 4 information are mixed and received by the receiving unit 70 during operation as the integrated transmission / reception unit, the mode is converted to the transmission / reception type by the controller 50, and as shown in FIG. The third switch 23 stops channel distribution and connects only the first switch 21, and the first switch 21 is closed only when transmitting to connect the first antenna 11 and opens when receiving the first antenna 11 The signal received from) is blocked to prevent crosstalk, and the second switch 22 directly connects the second antenna 12 to the receiver 70 to be used exclusively for reception, thereby preventing interference or crosstalk between channels. have. Herein, the first switch 21 and the fourth switch 24, the second switch 22 and the fifth switch 25, the third switch 23 and the sixth switch 26 correspond to each other and operate in the same manner. The seventh switch is to switch the third switch 23 and the sixth switch 26.

In addition, the voltage variable unit 40 is connected to the output terminal of the above-described transmission unit 60 and varies the output voltage of the transmission unit 60 under the control of the controller 50. (4) When the information is received, the output voltage of the transmitter 60 is gradually lowered until only one tag 4 information is received, so that only the signal of the closest tag 4 that the user wants to receive can be received. .

In addition, the RFID reader 5 according to the present invention is not limited to four channels as shown in FIGS. 2 and 3, but may be configured as two channels, such as six channels and eight channels. Of course, it can be configured as.

In addition, a number of antennas and switches have been distinguished in order to easily explain and explain the operating principle of the present invention. However, when the first switch 21 and the third switch 23 are integrated into a single transmission / reception unit, the first switch 21 is operated. Switching the antenna 11 and the second antenna 12, and when operating in a separate transmission and reception type, the second antenna 12 is not connected, and only the first antenna 11 is connected to the transmission, such as to form a switch. Even if configured, it is included in the same technical scope.

As shown in FIG. 4, the transmission / reception-separable RFID reader 5 according to the present invention is used in an RFID system applied to a metal environment such as a steel mill. It may be installed in the crane (1), the antenna 20 of the RFID reader (5) may be divided into both ends of the tongs 2 of the crane (1).

Each of the products in the form of a coil 3 made of metal produced in such an ironworks has a tag 4 storing product information and location information therein, and a plurality of coils 3 are stacked as shown in FIG. 4. When moving to a crane (1) to transport or ship a plurality of coils (3) in a warehouse in which the information on the tag (4) attached to the coil (3) must be read correctly to be moved to the location.

However, when a plurality of coils 3 are stacked as shown in FIG. 4, crosstalk, interference, and the like may occur. In this case, as described above, the RFID reader 5 may be operated in a transmission / reception type to prevent interference. Since the tag 4 of the coil 3 picked up by the tongs 2 of the crane 1 is the tag 4 closest to the RFID reader 5, when a plurality of pieces of tag 4 information are received, As described above, only the tag 4 which is closest to the RFID reader 5 by the voltage varying part 40 made of a variable attenuator or the like which varies the output voltage of the transmitting part 60 under the control of the controller 50. Since the output voltage of the transmitting unit 60 can be lowered and transmitted until only one tag 4 information is activated, the user can receive only the desired tag 4 information.

In addition, the control method of the transmit / receive detachable RFID reader 5 which can prevent the interference and accurately read the desired tag 4 information by using the transmit / receive detachable RFID reader 5 according to the present invention is received. If there is no signal, the controller 50 controls the RF switch 20 to transmit and receive an integrated operation step of using all channels of the transmitting and receiving antenna 10 for transmitting and receiving,

When the controller 50 detects that two or more tag 4 information is received during the operation of the transmission / reception integrated operation step, the controller 50 controls the RF switch 20 to transmit a channel of the transmission / reception antenna 10. Separate transmission and reception steps of transmitting and receiving divided into dedicated and receive-only,

When the controller 50 detects that two or more tags 4 are received during the operation of the transmission / reception operation, the voltage variable unit 40 outputs the output voltage of the transmitter 60 under the control of the controller 50. The output unit 60 may be configured to vary the output voltage of the transmitter 60 so that only one tag 4 information is received.

Herein, the above-described transmission / reception integrated operation step may be performed by the controller 50 so that the first switch 21 and the second switch 22 may transmit and receive using all the transmission / reception antennas 10. The third switch 23 is switched to distribute the channel of the transmit / receive antenna 10 and transmit and receive, and the above-described transmit / receive operation is controlled by the controller 50 to prevent interference. The first switch 21 is switched by, the third switch 23 is connected to the first switch 21 so that the antenna connected to the first switch 21 is used only for transmission, the second switch 22 directly transmits and receives the transmit / receive antenna 10 connected to the second switch 22 by directly connecting the transmit / receive antenna 10 in a path connected to the receiver 70.

As described above, the present invention is not limited to the above-described embodiments, but can be variously changed within the spirit and concept of the present invention.

1: crane 2: tong 3: coil
4: Tag 5: RFID reader
10: transmitting and receiving antenna 11: first antenna 12: second antenna
13: 3 antenna 14: 4 antenna 20: RF switch
21: first switch 22: second switch 23: third switch
24: fourth switch 25: fifth switch 26: sixth switch
27: seventh switch 30: receiving coupler 40: voltage variable portion
50: controller 60: transmitter 70: receiver

Claims (8)

In an RFID reader comprising a transmitting and receiving antenna having a plurality of channels, a transmitting unit transmitting a signal through the transmitting and receiving antenna, and a receiving unit receiving a signal through the transmitting and receiving antenna,
An RF switch for switching the transmit / receive antenna to be used for either transmit / receive, transmit, or receive only;
A reception coupler for transmitting only a reception signal of the transmission / reception antenna to the reception unit;
A controller connected to the receiver and the RF switch to control the RF switch according to a reception result of the receiver;
Transmittable and detachable RFID reader, characterized in that the voltage variable unit is connected to the output terminal of the transmitter to change the output voltage of the transmitter under the control of the controller.
A tag attached to a cylindrical coil moved by the tongs of the crane,
An RFID reader comprising a transmission / reception antenna having a plurality of channels, a transmission unit for transmitting a signal through the transmission / reception antenna, and a reception unit for receiving a signal through the transmission / reception antenna, and reading the information of the tag,
The transmitting and receiving antenna is installed on the tongs of the crane,
An RF switch electrically connecting the transmitting and receiving parts of the RFID reader installed in the transmitting and receiving antennas and the crane, and switching the transmitting and receiving antennas to be used as either a transmitting / receiving unit, a transmitting unit or a receiving unit;
A reception coupler for transmitting only a reception signal of the transmission / reception antenna to the reception unit;
A controller connected to the receiver and the RF switch to control the RF switch according to a reception result of the receiver;
Transmittable and detachable RFID reader, characterized in that the voltage variable unit is connected to the output terminal of the transmitter to change the output voltage of the transmitter under the control of the controller.
3. The method according to any one of claims 1 to 3,
The above-mentioned RF switch is composed of a first switch for switching the connection of the transmission and reception antennas, a second switch for switching the other transmission and reception antennas not connected to the first switch and a third switch for channel distribution,
The first switch and the second switch is connected to the transmission and reception antenna when the transmission and reception is integrated, the third switch is switched to distribute the channel of the transmission and reception antenna,
When operating as a separate transmission / reception type, the first switch switches, and the third switch connects the first switch so that the antenna connected to the first switch is used only for transmission, and the second switch connects the transmit / receive antenna with a path connected to the receiver. Transmittable and detachable RFID reader, characterized in that the direct connection is used for receiving only the transmitting and receiving antenna connected to the second switch.
The method according to any one of claims 1 and 2,
The above-mentioned receiving coupler passes the transmission signal as it is, and the transmission and reception separation type RFID reader, characterized in that connected to the receiver.
delete If there is no received signal, the controller controls the RF switch to transmit and receive an integrated operation step of using all channels of the transmitting and receiving antenna for transmitting and receiving;
When the controller detects that two or more tag information is received during the operation of the integrated transmission and reception operation step, the controller transmits and receives a separate transmission and reception operation by dividing the channel of the transmission and reception antenna by transmitting and receiving only by controlling the RF switch by the controller;
When the controller detects that two or more tag informations are received during the operation of the separate transmission / reception operation step, the output voltage of the transmitter is controlled so that only one tag information is received by varying the output voltage of the transmitter under the control of the controller. Control method of the transmission and reception separation type RFID reader using the RFID reader of claim 4, characterized in that it comprises a step.
The method of claim 6,
In the above-described transmitting / receiving integrated operation, the RF switch includes a first switch for switching the connection of the transmission / reception antenna, a second switch for converting other transmission / reception antennas not connected to the first switch, and a third switch for channel distribution. The first switch and the second switch is connected to the transmission and reception antenna by using a switch, and the third switch controls the transmission and reception separation type RFID reader, characterized in that for transmitting and receiving by distributing the channel of the transmission and reception antenna Way.
The method of claim 6,
The above-described transmitting / receiving operation may include a first switch for switching a connection of the transmission / reception antenna, a second switch for converting another transmission / reception antenna not connected with the first switch, and a third switch for channel distribution. The first switch is switched using a switch, and the third switch connects the first switch so that the antenna connected to the first switch is used only for transmission, and the second switch directly transmits and receives the transmit / receive antenna through a path connected to the receiver. Control method of the transmission and reception detachable RFID reader characterized in that the transmission and reception so that the transmission and reception antenna connected to the second switch is used only for reception.

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