CN100410960C

CN100410960C - System for detecting RF identification label

Info

Publication number: CN100410960C
Application number: CNB2005100640738A
Authority: CN
Inventors: 方建兴
Original assignee: LEIXIN TECHNOLOGY Co Ltd
Current assignee: LEIXIN TECHNOLOGY Co Ltd
Priority date: 2005-04-06
Filing date: 2005-04-06
Publication date: 2008-08-13
Anticipated expiration: 2025-04-06
Also published as: CN1845123A

Abstract

The present invention provides a system which is used for detecting a radio frequency identification tag on an object. The system comprises a tunnel which has a characteristic straight line size of a characteristic cross-section and/or a straight part and at least one bending part. Particularly, the characteristic straight line size is designed, so that the operation frequency of an antenna is lower than the cutoff frequency of the tunnel. Therefore, the leakage of electromagnetic waves transmitted by an antenna array can be reduced. Besides, the bending part is connected with one end of the straight part so as to avoid the occurrence that the electromagnetic waves are transmitted outside the tunnel.

Description

Detect the system of RF identification label

Technical field

The invention relates in order to detect a RF identification label (radio frequency identification, system RFID).

Background technology

In conventional art, radio-frequency discriminating (RFID) label is in order to status or article of identification one people.Generally speaking, when this class label is excited, can produce a magnetic field or an electric field, it has the first frequency by an identification code (identifying code) institute modulation.These labels can be active formula label (activetags), passive type label (passive tags) or half active formula label (semi-active tags), wherein active formula label has self-contained power supply supply (self contained power supply), exciting so that it can be read or handle in the detection space of a reading machine (reader) of passive type labeling requirement outside, half active formula label then are the features in conjunction with active formula label and passive type label.As if with the angle of a large amount of uses, the passive type label has more economic benefit than other two kinds of patterns.

Fig. 1 has shown in order to detect the system of a passive type RF identification label.This system comprises an antenna (antenna) 101, a reading machine 103 and a computing machine 105.Antenna 101 detects signal in order to transmit one of a certain radio frequency, and when the label on the object 107 109 is in the effective range of antenna 101, accepts the reflection signal from label 109.The reflection signal is received to be used for identification by reading machine 103.Label 109 is by after the identification, and reading machine 103 notice computing machines 105 are further to handle.One of them problem of this system may be disturbed by near other electromagnet source for its detection, similarly is to be disturbed by other magnetic field producer.

In order to address this problem, United States Patent (USP) the 6th, 094 discloses an aerial array (antennaarray) No. 173, in order to when a label detects a space or an inlet by one, and the radio-frequency discriminating signal label signal of having encoded that tags detected produced.Aerial array comprises at least the first antenna, second antenna and circuit, wherein first antenna, second antenna along detect the space around and be distributed in different positions, and circuit has a plurality of input ends and an output terminal, these a plurality of input ends receive the output signal from first and second antenna respectively, and output terminal then is to be connected to a signal receiver (signal receiver) so that the signal of being accepted is deciphered.This circuit provides an output signal, and it comprises the summation of the output signal of indivedual output signals of first and second antenna and first and second antenna.Another patent, United States Patent (USP) the 6th, 696, No. 954 an aerial array is also disclosed, it comprises a plurality of antenna loops (antenna loops), and it is configured to define an inlet, passage, or defines other surveyed area that these a plurality of antenna loops transmitted and/or received the electromagnetic wave signal.The signal that a processor processing that is connected with a plurality of antenna loops receives at least and/or the signal of transmission.A plurality of antennas can be configured to a rectangular array at a flexible base material that hangs, and can be by a wave filter (filter) or switch (selective switch) optionally, and are connected with processor.Processor can combine with an application system, coacts to finish desirable function.

Though United States Patent (USP) the 6th, 094, No. 173 and United States Patent (USP) the 6th, 696, one aerial array and an inlet device are disclosed for No. 954 to improve the detection of label, yet produced the use that the intense electromagnetic ripple may influence near the electronic installation system, the more serious health that may influence the people by aerial array.

Summary of the invention

The invention provides a kind of in order to detect a system of the RF identification label (radiofrequency identification tag) on an object.This system uses for object and passes through, and contains a passage (tunnel) and an aerial array (antenna array).This passage has a characteristic straight-line dimension (characteristic linear dimension) in a characteristic cross section (characteristiccross-section).This aerial array is to arrange on every side along one of characteristic cross section, in order to when object passes through passage, detects RF identification label with an operating frequency.Particularly, design this characteristic straight-line dimension so that operating frequency is lower than the cutoff frequency of passage.Therefore, can reduce near the leakage loss of electromagnetic wave passage that aerial array transmits.

It is a kind of in order to detect the RF identification label on an object that the present invention more provides) a system.This system comprises a passage, an aerial array and processor.This passage is used for object and is passed through, and has a straight portion and at least one sweep.This aerial array is arranged on every side along one of straight portion, in order to when object passes through passage, detects RF identification label, and this processor is in order to analyze by the electromagnetism pattern of this aerial array detect from the signal of this object.Straight portion comprises two relative end points.One of them of this at least one sweep and two relative end points links to each other with the electromagnetic-wave leakage avoiding being produced by the aerial array outside to straight portion.

Description of drawings

Fig. 1 shows a prior art, in order to detect a system of a RF identification label;

Fig. 2 shows in order to detect a system of a RF identification label according to the first embodiment of the present invention;

Fig. 3 shows according to a second embodiment of the present invention in order to detect a system of a RF identification label; And

Fig. 4 a third embodiment in accordance with the invention shows in order to detect a system of a RF identification label.

Fig. 5 a fourth embodiment in accordance with the invention shows in order to detect a system of a RF identification label.

Symbol description

101 antennas, 103 reading machines

105 computing machines, 107 objects

109 labels, 20 systems

201 passages, 203 aerial arrays

203a, 203b, 203c antenna

205 characteristic cross sections, 207 objects

209 labels, 211,213 openings

215 travelling belts, 217 inside surfaces

219 outside surfaces, 221 processors

30 systems, 301,303 barriers

40 systems, 401 passages

403 aerial array 403a, 403b, 403c antenna

405 straight portion, 407 first sweeps

409 second sweeps, 411 objects

Around 413 labels 415

417,419 end points, 421 travelling belts

423,425 openings, 427 inside surfaces

429 outside surfaces, 431 processors

50 systems, 501 passages

503 aerial arrays, 505 straight parts

507 first sweeps, 509 second sweeps

511 objects, 513 labels

515 end points, 517 end points

Embodiment

With reference to figure 2, system 20 is adapted at using in supermarket or the department store, the thing of purchasing with the clearing house.System 20 comprises a passage 201 and an aerial array 203.Passage 201 is fit to allow an object 207 pass through, and has a characteristic straight-line dimension R in a characteristic cross section 205.In this embodiment, characteristic cross section 205 is a border circular areas, and characteristic straight-line dimension R is the diameter of border circular areas for this reason.Aerial array 203 is to arrange on every side along one of characteristic cross section 205, in order to when object 207 passes through passage 201, detects a RF identification label 209 with an operating frequency.Though the characteristic cross section 205 of first embodiment is a border circular areas, the present invention does not limit its shape.For instance, it also can be a rectangle.

The electromagnetic wave that is produced by aerial array 203,201 two openings 211 and 213 are the decay of exponential type from characteristic cross section 205 to passage.Passage 201 has a cutoff frequency.According to waveguide theory, the electromagnetic wave that any frequency is lower than cutoff frequency can't be sent out passage 201, and wherein cutoff frequency is determined by characteristic straight-line dimension R.Particularly, characteristic straight-line dimension R is inversely proportional to cutoff frequency.Therefore, but design characteristics straight-line dimension R makes cutoff frequency also bigger than a predetermined operating frequency.On the other hand, operating frequency can be set to also littler than predetermined cutoff frequency.By the electromagnetic wave that aerial array 203 is produced, above-mentioned two kinds of methods all can make it can not be sent to passage 201 outsides.Therefore, such arrangement can be avoided near the use of the electronic device the system that has influence on 20, and can avoid influencing the health of human body.

System 20 also comprises a travelling belt 215 (conveyer), runs to opening 213 from opening 211, to be used for transmitting object 207 and to control moving of object 207.When object 207 was sent near aerial array 203, label 209 can be detected.

Passage 201 comprises an inside surface 217 and an outside surface 219.The inside surface 217 of passage 201 is equipped with a microwave absorber (microwave absorber) to absorb the electromagnetic wave that is produced by aerial array 203, mainly can avoid electromagnetic wave to be sent to passage 201 outsides.Outside surface 219 is covered by a metallics, and can stop some outside precipitate electromagnetic waves, makes these precipitate external electromagnetic waves can not disturb label to detect.

Aerial array 203 comprises four antennas, and promptly

antenna

203a, 203b, 203c reach one (not being shown among the figure) on the 203b opposite.These four antennas prolonging characteristic cross section 205 around equidistant spaced apart, corresponding label 209 forms a cognizable pattern of an electromagnetic riveting machine signal.Yet the present invention does not limit the antenna amount of aerial array.System 20 also comprises a processor 221 that is attached to aerial array 203, in order to analyzing cognizable pattern, and then by identification label 209 and identification objects 207.

Because there is good barrier in system 20, so the power of scalable aerial array 203, near the people's can not injuring with tags detected 209 clearly is healthy.

Fig. 3 shows a system 30, compares with system 20, and system 30 has also comprised two barriers (shields) (301 and 303), in order to optionally to cover opening 211 and 213 respectively.When barrier 301 and 303 was closed, electromagnetic wave can be isolated in the inside of passage.Barrier 301 and 303 can be door, a dividing plate or the curtain with electric conductivity, is attached on the passage in a movable manner.In addition, barrier 301 can cooperate with the inlet of object with 303, for instance, and in a supermarket, in order to avoid some other object of client due to not of wrong detection.

Comprise a passage 401 and an aerial array 403 with reference to figure 4, one systems 40.Passage 401 is in order to allowing an object 411 that contains a label 413 pass through, and passage 401 has a straight portion 405, one first sweep 407 and one second sweep 409.In this embodiment, the cross section of straight portion 405 is a rectangular area.Straight portion 405 has two relative end points 417 and 419.First sweep 407 joins with end points 417, and second sweep 409 joins with end points 419.Aerial array 403 is in order to tags detected 413 when object 411 passes through passage 401, and is prolonging one of

straight portion

405 and 415 arranging on every side.First and second sweep (407,409) all turn 90 degrees and makes passage in the same direction straight portion 405 is a U type shape.The electromagnetic wave that is produced by aerial array 403 is limited in the passage 401 by first and second sweep (407,409).

Aerial array 403 comprises four antennas, and promptly antenna 403a, 403b, one (not being shown among the figure) on the 403a opposite reach one (not being shown among the figure) on the 403b opposite.415 passages 401 had by 415 cutoff frequencys that determined (cutoff frequency) on every side around these four antennas were prolonging.Particularly, 415 length is inversely proportional to cutoff frequency on every side.Therefore, can design on every side and 415 make cutoff frequency also bigger than operating frequency.On the other hand, operating frequency can be set to also littler than cutoff frequency.Above-mentioned two kinds of methods all can make the electromagnetic wave that is produced by aerial array 403 can not be sent to passage 401 outsides.

System 40 also comprises a travelling belt (conveyer) 421, runs to opening 425 from opening 423, to be used for transmitting object 411 and to control moving of object 411.When object 411 was sent near aerial array 403, label 413 can be detected.

Passage 401 comprises an inside surface 427 and an outside surface 429.The inside surface 427 of passage 401 is equipped with a microwave absorber, to absorb the electromagnetic wave that is produced by aerial array 403, can avoid electromagnetic wave to be sent to passage 401 outsides.Outside surface 429 is covered by a metallics, and can stop some outside precipitate electromagnetic waves, makes these precipitate external electromagnetic waves can not disturb label to detect.

System 40 also comprises a processor 431 that is attached to aerial array 403, in order to analyze cognizable pattern and to have followed by identification label 413 and identification objects 411.

Comprise a passage 501 and an aerial array 503 with reference to figure 5, one systems 50.Passage 501 is in order to allowing an object 511 that contains a label 513 pass through, and has a straight portion 505, one first sweep 507 and one second sweep 509.Straight portion 505 has two relative end points 515 and 517.First sweep 507 joins with end points 515, and second sweep 509 joins with end points 517.System 50 is that with the difference of system 40 first and second sweep (507,509) is that straight portion 505 is turn 90 degrees in the opposite direction, is a S type shape and make passage 501.Similarly, first and second sweep (507,509) can avoid being sent to by the electromagnetic wave that aerial array 403 is produced the outside of passage 401.

Use aforesaid system, if increase the power of aerial array, can harm people yet healthy, near the electronic equipment yet can EVAC (Evacuation Network Computer Model).This class The Application of Technology can be at the supermarket, use in department store, retail trade, wholesale business, tourist quarters, government bodies, pharmacy and the relevant place.

The above is the preferred embodiments of the present invention only, is not in order to limit claim of the present invention; All other do not break away from the equivalence of being finished under the disclosed spirit and changes or modification, all should comprise within the scope of the invention.

Claims

1. one kind in order to detect the system of the RF identification label on an object, comprising:

One passage passes through for this object, has a straight portion and at least one sweep; And

One aerial array is arranged on every side along one of this straight portion, in order to when this object passes through this passage, detects this RF identification label;

One processor is in order to analyze by the electromagnetism pattern of this aerial array detect from the signal of this object;

Wherein this straight portion has the end points of two opposition, and in the end points of this at least one sweep and these two opposition one of them joined.

2. system according to claim 1, wherein this aerial array comprises four antennas, equidistant separating around this to should RF identification label, but forms an identification pattern of an electromagnetic riveting machine signal.

3. system according to claim 1, wherein should around determine a cutoff frequency of this passage, and this aerial array is lower than under the operating frequency of this cutoff frequency one and operates.

4. system according to claim 1 also comprises a forwarder, passes this passage and turns round, in order to transmit this object and to control moving of this object.

5. system according to claim 1, wherein this passage comprises an inside surface and an outside surface, this inside surface is equipped with a microwave absorber, and this outside surface is covered by a metallics.

6. system according to claim 1, wherein this passage has an opening and this system comprises a barrier, in order to optionally to cover this opening.

7. system according to claim 1, wherein a cross section of this straight portion is a border circular areas.

8. system according to claim 1, wherein a cross section of this straight portion is a rectangular area.

9. system according to claim 1, wherein this passage be a U type or a S type wherein one.