CN101351816A - RFID antenna and RFID tag - Google Patents

RFID antenna and RFID tag Download PDF

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Publication number
CN101351816A
CN101351816A CNA2007800010891A CN200780001089A CN101351816A CN 101351816 A CN101351816 A CN 101351816A CN A2007800010891 A CNA2007800010891 A CN A2007800010891A CN 200780001089 A CN200780001089 A CN 200780001089A CN 101351816 A CN101351816 A CN 101351816A
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China
Prior art keywords
conductor
antenna
electric
radio frequency
electric conductor
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CNA2007800010891A
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Chinese (zh)
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CN101351816B (en
Inventor
权洪逸
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LG CNS Co Ltd
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LG Innotek Co Ltd
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Priority claimed from KR1020060037909A external-priority patent/KR100793525B1/en
Application filed by LG Innotek Co Ltd filed Critical LG Innotek Co Ltd
Priority claimed from PCT/KR2007/001832 external-priority patent/WO2007119992A1/en
Publication of CN101351816A publication Critical patent/CN101351816A/en
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Publication of CN101351816B publication Critical patent/CN101351816B/en
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
    • G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
    • G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
    • G06K19/077—Constructional details, e.g. mounting of circuits in the carrier
    • G06K19/07749—Constructional details, e.g. mounting of circuits in the carrier the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
    • G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
    • G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
    • G06K19/077—Constructional details, e.g. mounting of circuits in the carrier
    • G06K19/07749—Constructional details, e.g. mounting of circuits in the carrier the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card
    • G06K19/07766—Constructional details, e.g. mounting of circuits in the carrier the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card comprising at least a second communication arrangement in addition to a first non-contact communication arrangement
    • G06K19/07767—Constructional details, e.g. mounting of circuits in the carrier the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card comprising at least a second communication arrangement in addition to a first non-contact communication arrangement the first and second communication means being two different antennas types, e.g. dipole and coil type, or two antennas of the same kind but operating at different frequencies
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/2208—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems
    • H01Q1/2225—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems used in active tags, i.e. provided with its own power source or in passive tags, i.e. deriving power from RF signal
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
    • H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support

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  • Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Details Of Aerials (AREA)

Abstract

Provided are a radio frequency identification (RFID) antenna and an RFID tag including the RFID antenna. The RFID antenna includes an electric conductor and a conductor that radiate electromagnetic fields isotropically. The RFID tag including the RFID antenna can be installed on a metal plate.

Description

RFID antenna and RFID tag
Technical field
The embodiment of the invention relates to radio frequency identification (RFID) antenna and RFID label.
Background technology
Rfid system is utilizing radiowave to exchange various data with bandwidth generally each other.
Rfid system comprises label (or transponder) and reader (or plug-in reader).Label comprises unique identifying information.Label is attached to for example object or animal.Reader is read identifying information/identifying information is write label from label.
Reader can be recognized, follow the tracks of and manage and be attached to for example product, animal or human's label by contact or noncontact mode.In addition, reader can record information to label.
Fig. 1 shows the RFID label 10 according to correlation technique.
With reference to figure 1, RFID label 10 comprises semi-conductor chip 20 and antenna 30.Semi-conductor chip 20 sends or receives radio wave frequency by antenna 30.
10 pairs of signals from predetermined less radio-frequency (RF) frequency band of RFID reader (not shown) transmission of RFID label reflect.Here, 10 pairs of RF signals of RFID label are modulated to add identifying information and to send it to the RFID reader.
The antenna 30 of RFID label 10 is formed on the dielectric film 40 by the form of printing with dipole antenna.Therefore, have null value (null) in a certain direction that does not form radiation pattern of dipole antenna 30, RFID label 10 can not be in this zero-signal direction and the proper communication of RFID reader like this.
Summary of the invention
An embodiment provides antenna with isotropic radiation pattern and radio frequency identification (RFID) label that comprises this antenna.
An embodiment provides antenna that utilizes inductive coupling and the RFID label that comprises this antenna.
An embodiment provides antenna that can be installed on the sheet metal and the RFID label that comprises this antenna.
An embodiment provides a kind of radio frequency identifying antenna, comprising: the closed-loop shaped electric conductor that is provided with electric power; There is not the open loop shape conductor that electrically contacts, be positioned at this electric conductor outside with electric conductor.
An embodiment provides a kind of wireless radio frequency identification mark, comprising: antenna, this antenna comprise the closed-loop shaped electric conductor that is provided with electric power and do not have the open loop shape conductor that electrically contacts, be positioned at this electric conductor outside with this electric conductor; And the semi-conductor chip that is electrically connected with the load point (feeding point) of electric conductor.
An embodiment provides a kind of wireless radio frequency identification mark, comprising: dielectric body; Be positioned on this dielectric body, comprise the flat plane antenna in slit; In dielectric body, have a semi-conductor chip of the end that is electrically connected with antenna.
According to the RFID antenna and the RFID label of exemplary embodiment, this RFID label do not have the RFID label can not with the zero-signal direction of reader communication, so this RFID label can be appended on the product reliably.
And, because the RFID antenna of RFID label forms the simple plane shape by printing, therefore be easy to make the RFID label.
In addition, owing to use the RFID label aspect the installation site, to have less restriction, so can make things convenient for and use rfid system reliably with RFID label.
In addition, because the RFID antenna is formed with the slit, therefore can reduce the size or the length of RFID antenna.
And RFID label even can be installed on the sheet metal can increase the applicability of RFID label like this.
Description of drawings
Fig. 1 shows radio frequency identification (RFID) label according to correlation technique;
Fig. 2 shows the RFID label according to first embodiment;
Fig. 3 shows the radiation pattern according to the RFID antenna of first embodiment;
Fig. 4 shows the radiation pattern according to the three dimensional form of the RFID antenna of first embodiment;
Fig. 5 shows the response characteristic curve map according to the RFID antenna of first embodiment;
Fig. 6 shows the application example according to the RFID label of first embodiment;
Fig. 7 shows the installation according to the semi-conductor chip of first embodiment;
Fig. 8 shows the rfid system that comprises reader and RFID label shown in Figure 6;
Fig. 9 to 13 shows the modification example according to the RFID antenna of first embodiment;
Figure 14 shows the cross-sectional view according to the RFID label of second embodiment;
Figure 15 shows the skeleton view according to the application example of the RFID label of second embodiment.
Embodiment
Below in conjunction with exemplary embodiment radio frequency identification (RFID) antenna and RFID label are described.
[first embodiment]
Fig. 2 shows the RFID label 100 according to first embodiment.
With reference to figure 2, RFID label 100 comprises semi-conductor chip 110 and antenna 140.Antenna 140 comprises electric conductor 120 and a plurality of conductor 130.
Semi-conductor chip 110 is integrated circuit (IC) chips, and comprises less radio-frequency (RF) emission/receiving circuit, steering logic and storer.Semi-conductor chip 110 is by antenna 140 emissions or receive wireless frequency.
Conductive contact member such as band are formed on the load point (for example electric power provides a little) 127 and 128 of electric conductor 120.Semi-conductor chip 110 is installed on the conductive contact member.
Electric conductor 120 is main bodys of antenna 140, and it has the shape of ellipse or polygon (for example rectangle and pentagon).Electric conductor 120 has formed the closed loop except that load point 127 and 128.Electric conductor 120 and conductor 130 can be formed by same material.Electric conductor 120 is electrically connected with semi-conductor chip 110, and conductor 130 is not electrically connected with semi-conductor chip 110.
The electric current electric conductor 120 of flowing through.Electric conductor 120 comprises: be connected to semi-conductor chip 110 first line 121 and 122, be connected to first line 121 and 122 two ends second line 123 and 124, be connected to the three-way 125 of second line 123 and 124 two ends. First line 121 and 122 and the three-way 125 is arranged accordingly, and second line 123 and 124 corresponds to each other. First line 121 and 122 and second line 123 and 124 account for about 60% to 80% of electric conductor 120 on length.
Conductor 130 is divided at least two parts with open loop form by electricity.Conductor 130 is not electrically connected with electric conductor 120.Conductor 130 is formed on the outside of electric conductor 120.
Conductor 130 comprises first conductor 131 and second conductor 132.First conductor 131 is corresponding to first line and second line 121,122,123 and 124 of electric conductor 120.Second conductor 132 is corresponding to first conductor the 131 and the three-way 125.First line to the of electric conductor 120 three-way 121 to 125 and conductor 130 be standoff distance (d) spatially.This distance (d) can be constant or change for every line.
The two ends 135 of first conductor 131 and second conductor 132 predetermined gap (G) of being separated by.Gap (G) is electric areas of disconnection.Gap (G) can equal the distance between the three-way 125 and second conductor 132 of electric conductor 120
Second conductor 132 can form rectilinear form, or the two ends 136 of second conductor 132 can be crooked.Second conductor 132 is than three-way 125 length of extending in X-direction, and the two ends 136 of second conductor 132 can be positioned at the inside or the outside of the extended line of drawing from the two ends of first conductor 131 parallel with Y-axis.
Conductor 130 and electric conductor 120 can form identical shape or similar linear.For example, conductor 130 and electric conductor 120 can form the polygon or the elliptical line of symmetry or asymmetric pattern.And, can change the live width of conductor 130 and electric conductor 120 according to the characteristic of the hope of antenna 140.
The feed-in electric current (i) that is provided by semi-conductor chip 110 can flow through electric conductor 120 clockwise or counterclockwise.Signal energy with radio frequency is radiated to conductor 130 from the line 121,122,123,124 and 125 of electric conductor 120 gradually with the form in electric field or magnetic field.As a result, the signal energy by electric conductor 120 has produced coupling phenomenon at conductor 130 places.
In other words, electric energy shifts between electric conductor 120 and conductor 130 with the mutual inductance coupling type, has produced inductive coupling.Because the inductive coupling between conductor 130 and the electric conductor 120, the electric capacity of semi-conductor chip 110 can be reduced, and the resonant frequency of semi-conductor chip 110 can be broadened.
In the RFID of this embodiment label 100, the electric current that is provided to electric conductor 120 by semi-conductor chip 110 excites conductor 130, causes inductive coupling.Inductive coupling from semi-conductor chip 110 farthest the three-way 125 around the strongest.
The input resistance component of the feed-in of antenna 140 part and conductor resistance reciprocal proportional.Can regulate the input resistance component by the inductive coupling coefficient between electric conductor 120 and the conductor 130.Therefore, since the decline of the input resistance that the miniaturization of antenna causes can be solved.In addition, the inductance that can easily regulate electric conductor 120 according to the size and the position of the feed-in of antenna 140 part.
The mutual inductance coupling coefficient can followingly be represented:
M = μ 0 2 π l b ln ( 1 + l a d )
Wherein, μ 0The expression permeability of free space, l bExpression electric conductor 120 is at the length of Y direction, l aExpression electric conductor 120 is in the length of X-direction, and d represents the distance between electric conductor 120 and the conductor 130.
The impedance of feed-in loop can be expressed as:
Z loop＝j2πfL loop
L wherein LoopThe self-induction of expression feed-in loop.
In the antenna 140 of RFID label 100, the input impedance component only is the function of mutual inductance coupling coefficient (M), and reactive component only is the inductance L of feed-in loop LoopFunction.Therefore, can regulate distance between electric conductor 120 and the conductor 130 according to the mutual inductance coupling coefficient.
Fig. 3 and Fig. 4 show the radiation pattern according to the antenna of the first embodiment RFID label.
With reference to Fig. 3, the antenna of RFID label has isotropic radiation pattern.This radiation pattern is to be produced by the inductance that is coupled between electric conductor and the conductor.The horizontal component of radiation pattern is produced by the line that is parallel to Z axle and X-axis of antenna, and the vertical component of radiation pattern is produced by the line that is parallel to Y-axis of antenna.θ represents the angle on XY plane,
Figure A20078000108900082
Represent measured angle about Y-axis.
Fig. 4 shows radiation pattern according to the antenna of the RFID label of first embodiment with three dimensional form.With reference to Fig. 4, this antenna has the isotropic radiation pattern about X, Y and Z direction.Therefore, when RFID label and RFID reader communication, form zero-signal zone hardly, like this, the RFID label can be on all directions and the RFID reader communication.
Fig. 5 shows the curve map according to the radar cross section (RCS) of the antenna of the RFID label of first embodiment.RCS is when the RFID reader is changed 0 °, 30 °, 60 ° and 90 ° about the angle θ of RFID label, and with the angle of RFID reader about the RFID label
Figure A20078000108900083
When changing 0 °, 30 °, 60 ° and 90 °, measured volume reflection from antenna.As shown in Figure 5, the antenna from the RFID label almost is constant on all directions to being reflected in of RFID reader.
Fig. 6 shows the RFID label 100 on the basic components 150 of being installed in according to first embodiment.
With reference to Fig. 6, RFID label 100 is installed in the front surface or the rear surface of basic components 150.Use conducting resinl on basic components 150, to form pattern by silk screen print method, so that form antenna 140.Like this, the electric conductor 120 of antenna 140 and conductor 130 can form at grade.
Basic components 150 are formed by the non-conductive material of flexibility.For example, flexible non-conductive material comprises: polyethylene terephthalate (PET), polyimide (PI), PEN (PEN), Polyvinylchloride (PVC), paper, acetic acid esters (acetate), polyester, tygon, polypropylene, the polypropylene with lime carbonate, acrylonitrile-butadiene-styrene copolymer (ABS), or plastics.Basic components 150 can be formed by one or more or its combination of listed material.According to the purposes of RFID label 100, the antenna that is installed on the basic components 150 can have different shape, as polygon and ellipse.
And, comprise that the basic components 150 of RFID label 100 can be coated with the insulating protective layer (not shown).This protective seam can be formed by the material that equals or be similar to the material of basic components 150.For example, this protective seam can use heating and pressurized heat plastic material to form.Because RFID label 100 is between basic components 150 and protective seam, so RFID label 100 can be protected, and be not subjected to environmental factor as collision and moist influence.In addition, in this embodiment, antenna 140 can be by forming electric conductor (or conductor), form conductor (or electric conductor) on protective seam on basic components 150, and basic components 150 and protective seam combined form.
Fig. 7 shows the installation according to the semi-conductor chip 110 of first embodiment.
Shown in (a) among Fig. 7, semi-conductor chip 110 can be installed on the conductive pad 111 that is connected with electric conductor 120 by upside-down method of hull-section construction.Alternatively, shown in (b) among Fig. 7, semi-conductor chip 110 can be connected with electric conductor 120 by line 113.That is to say, semi-conductor chip 110 and electric conductor 120 can be electrically connected by upside-down method of hull-section construction, line connection method or according to other method of using.
Fig. 8 shows the rfid system according to first embodiment.
With reference to Fig. 8, rfid system comprises RFID label (or transponder) 100 and reader (or plug-in reader) 160.RFID label 100 and reader 160 utilize the short-distance wireless communication frequency band to communicate with one another.The short-distance wireless communication frequency band be for example 860MHz to the UHF frequency band of 950MHz.Rfid system can use various wireless communication frequency band according to application.That is to say that this embodiment is not limited to the UHF frequency band.
RFID label 100 is installed on the basic components 150, and communicates by letter with reader 160 by contact or non-contacting method.RFID label 100 transmits the data (as identification information) that are stored in the storer by the backscattering communication law.
RFID label 100 can be the passive RFID tags that comprises the active RFID tag of battery or do not comprise internal electric source (as battery).Under latter event, RFID label 100 can be used to come work from the electric wave energy of reader 160.
Fig. 9 shows example according to the change of the RFID antenna of first embodiment to Figure 13.Fig. 9 is exemplary antenna to RFID antenna shown in Figure 13.That is to say that RFID antenna of the present invention can have various structures according to application.
With reference to Fig. 9, RFID label 200 comprises semi-conductor chip 210 and pentagon antenna 240.Antenna 240 comprises electric conductor 220 and the conductor 230 that forms with two pentagon patterns.
Electric conductor 220 can have 60 ° to 120 ° interior angle θ 0 and the θ 1 in the scope.The interior angle θ 2 of conductor 230 is determined by the interior angle of electric conductor 220.In the interior angle of electric conductor 220 or conductor 230 one can be in 60 ° to 320 ° scope for example, so that minimize the wave interference between the adjacent lines.
With reference to Figure 10, RFID label 300 comprises the antenna 340 of semi-conductor chip 310 and round rectangle.Antenna 340 comprises electric conductor 320 and conductor 330.The angle of electric conductor 320 or conductor 330 is round.Conductor 330 comprises first conductor 331 and second conductor 332.Conductor 330 can form the reservation shape with at least one smooth curve part, as oval, rhombus and trapezoidal.
With reference to Figure 11, RFID label 400 comprises semi-conductor chip 410 and the antenna 440 with predetermined aspect ratio.Antenna 440 comprises electric conductor 420 and conductor 430.The aspect ratio of electric conductor 420 or conductor 430 can be 4: 5 or 5: 4.
With reference to Figure 12, RFID label 500 comprises semi-conductor chip 510 and the antenna 540 with different interior angles.Antenna 540 comprises electric conductor 520 and conductor 530.Electric conductor 520 comprises first line 521 and 522, and the angle of Xing Chenging is θ 3 each other; Form angle theta 4 between second line 523, itself and first line 521.Angle θ 3 is equal to or greater than 180 °, and angle θ 4 is less than 120 °.For example, angle θ 3 can be in 180 ° to 300 ° scope, and angle θ 4 can be in 60 ° to 120 ° scope.Conductor 530 is formed at the outside of electric conductor 520, and has the interior angle that is similar to electric conductor 520.
With reference to Figure 13, RFID label 600 comprises semi-conductor chip 610 and antenna 640.Antenna 640 comprises electric conductor 620 and is formed at the conductor 630 in electric conductor 620 outsides.The two ends 636 of second conductor 632 of conductor 630 bend towards the two ends 635 of first conductor 631 of conductor 630.The two ends 636 of second conductor 632 can extend upward by with the three-way 625 of electric conductor 620 the parallel line L1.
According to the example of the change of first embodiment and first embodiment, the antenna of RFID label comprises electric conductor and the conductor that forms dual structure.Therefore, by the inductive coupling between electric conductor and the conductor (or mutual inductance coupling input method), the RFID label can have isotropic pattern.
[second embodiment]
Figure 14 shows second embodiment to Figure 15.Figure 14 shows the sectional view according to the RFID label of second embodiment.Figure 15 shows the skeleton view according to the application example of the RFID label of second embodiment.
With reference to Figure 14 and 15, RFID label 700 comprises semi-conductor chip 710 and antenna 730, and dielectric body 740.
Semi-conductor chip 710 places in the dielectric body 740, and is with 722 to be connected with 724 with first band and second.First is connected with the back of antenna 730 with 722, and second is with 724 to be connected with ground.
Because semi-conductor chip 710 places the inside of dielectric body 740, so semi-conductor chip 710 can easily be installed.Dielectric body 740 can be formed by frame resistance 4 (FR-4).
Antenna 730 is formed on the dielectric body 740 with the form of planar inverted F type antenna (PIFA).For example, antenna 730 can comprise upper plate 732 and from the side plate 731 of upper plate 732 bendings.In the scope of 2mm, the area of upper plate 732 is approximately 50*30mm to the height of side plate 731 at 1mm.Antenna 730 can have various sizes according to application.
Antenna 730 can comprise at least one slit 735 in the upper plate 732 that is electrically connected with semi-conductor chip 710.The distance D 2 that slit 735 is predetermined at interval with semi-conductor chip 710.
The slit 735 of antenna 730 is formed in the upper plate 732 with the form of rectangular aperture (or straight slot), and does not extend to the outside of upper plate 732.Can regulate the width in slit 735, make that the capacitive reactance of semiconductor 710 can be the complex conjugate of the induction reactance of antenna 730: (jx ,+jx).
Slit 735 can be formed on the direction vertical with direction of current or cross over shortest path, thereby prevents that electric current from flowing through along shortest path.Because antenna 730 comprises slit 735, so the effective length of antenna (electrical length) can be increased under the situation that does not increase antenna 730 sizes.That is to say, can reduce the size of antenna 730.In addition, in order to reduce size, the upper plate 732 that wherein is formed with slit 735 can be formed zigzag.
Current-carrying plate 760 can be attached to the lower surface of RFID label 700, as shown in figure 15.Current-carrying plate 760 can be formed by metal material, and its size can be greater than the size of upper plate 732.
In other words, RFID label 700 is installed on the current-carrying plate 760.In this case, what be connected with semi-conductor chip 710 first is with 722 to be electrically connected with current-carrying plate 760, and the bottom of side plate 731 is electrically connected with current-carrying plate 760.
Though the antenna 730 of RFID label 700 is electrically connected with current-carrying plate 760, antenna 730 can operate as normal.
When RFID label 700 and RFID reader communication, semi-conductor chip 710 provides electric current to antenna 730.In antenna 730, electric current (i) flows through around the slit 735 of upper plate 732 and leaves slit 735.
In addition, because slit 735 has changed path of current in the antenna 730, so the electrical length of antenna 730 (effective length) can be increased the length in slit 735.That is to say that the length of antenna 730 can be reduced the length in slit 735.Therefore, the size of RFID label 700 can be reduced.
The RFID label 700 of second embodiment utilizes predetermined short-distance wireless communication frequency band and reader communication.Here, the short-distance wireless communication frequency band is the UHF frequency band from 860MHz to the 950MHz scope for example.In addition, RFID label 700 provides identifying information by radio communication to reader.RFID label 700 can be the passive RFID tags 700 that comprises the active RFID tag 700 of battery or do not comprise battery.Under latter event, RFID label 700 can utilize the electric wave energy that receives from reader to come work.
Though by in conjunction with the preferred embodiments the present invention having been carried out concrete demonstration and description, be appreciated that those skilled in the art can carry out the change of various forms and details, and do not break away from the spirit and scope of the present invention that limit as claims.It only is descriptive and do not have the purpose of restriction that preferred embodiment should be considered to.
Therefore, scope of the present invention be can't help detailed description of the present invention and is limited, and is limited by claims, and all differences within this scope will be considered to be included in the present invention.
In RFID antenna and RFID label according to exemplary embodiment of the present invention, the RFID label do not have the RFID label can not with the zero-signal direction of reader communication, so the RFID label can be applied to product reliably.
In addition, because the RFID antenna of RFID label forms the simple plane shape by printing, so the RFID label can easily be made.
In addition, have less restriction owing to can use the RFID label aspect the installation site, the rfid system that therefore has the RFID label can be used easily and reliably.
And because the RFID antenna is formed with the slit, so the size of RFID antenna or length can be reduced.
In addition, RFID label even can be installed on the sheet metal, thus improve the applicability of RFID label.

Claims (20)

1. radio frequency identifying antenna comprises:
Be provided with the closed-loop shaped electric conductor of electric power; And there is not the open loop shape conductor that electrically contacts, be positioned at this electric conductor outside with this electric conductor.
2. radio frequency identifying antenna as claimed in claim 1, wherein said electric conductor and conductor are polygon or ellipse.
3. radio frequency identifying antenna as claimed in claim 1, wherein said electric conductor and conductor are formed on the same plane.
4. radio frequency identifying antenna as claimed in claim 1, wherein said electric conductor and conductor dbus are crossed by the caused inductive coupling of the electric current that provides to electric conductor has isotropic radiation pattern.
5. radio frequency identifying antenna as claimed in claim 1, wherein said conductor comprises a plurality of conductors, these conductors are in the electric each other disconnection in side angle place away from the load point of electric conductor.
6. radio frequency identifying antenna as claimed in claim 1, wherein said conductor comprises:
First conductor forms along line described electric conductor, that extend from the load point of electric conductor; And
With second conductor of the electric disconnection of first conductor, along the line formation of load point described electric conductor, that leave electric conductor.
7. radio frequency identifying antenna as claimed in claim 1, wherein said electric conductor or described conductor have at least one scope at 60 ° to 320 ° interior angle.
8. wireless radio frequency identification mark comprises:
Antenna, this antenna comprise the closed-loop shaped electric conductor that is provided with electric power and do not have the open loop shape conductor that electrically contacts, be positioned at this electric conductor outside with this electric conductor; And semi-conductor chip, be electrically connected with the load point of described electric conductor.
9. wireless radio frequency identification mark as claimed in claim 8 comprises basic components, and on these basic components, described electric conductor and described conductor are printed as predetermined pattern in the same side.
10. wireless radio frequency identification mark as claimed in claim 8, wherein said electric conductor and described conductor are formed symmetry or asymmetrical polygon, symmetrical or asymmetrical ellipse.
11. wireless radio frequency identification mark as claimed in claim 8, wherein said conductor comprises:
First conductor, the edge is formed with at interval from the outside of the line of the electric conductor of described load point extension; And
With second conductor of the electric disconnection of first conductor, outside the line of the electric conductor that leaves described load point, be formed with at interval.
12. wireless radio frequency identification mark as claimed in claim 11, wherein second conductor is the shape that linear or at least one end bend towards first conductor.
13. wireless radio frequency identification mark as claimed in claim 11, wherein first and second conductors are in the electric each other disconnection in the side angle place of the line of the electric conductor that leaves described load point.
14. wireless radio frequency identification mark as claimed in claim 8, wherein said antenna has isotropic radiation pattern by electric conductor and the inductive coupling between the conductor that is caused by the electric current that provides to electric conductor.
15. wireless radio frequency identification mark as claimed in claim 9, wherein said basic components are formed by the material of selecting from the group that comprises the following: polyethylene terephthalate (PET), polyimide (PI), PEN (PEN), Polyvinylchloride (PVC), acetic acid esters, polyester, tygon, polypropylene, lime carbonate, plastics, non-conductive material and their combination.
16. wireless radio frequency identification mark as claimed in claim 8, wherein said RFID tag are be operated in the UHF frequency band active or passive radio-frequency identification labeled.
17. a wireless radio frequency identification mark comprises:
Dielectric body;
On described dielectric body and comprise the flat plane antenna in slit; And
Semi-conductor chip in described dielectric body, the one end is electrically connected with described antenna.
18. wireless radio frequency identification mark as claimed in claim 17, wherein said antenna are rectangular plate shape or planar inverted F type antenna (PIFA) shape.
19. it is close-shaped that wireless radio frequency identification mark as claimed in claim 17, wherein said slit one of are at least located to form in the position of load point that approaches described antenna and semi-conductor chip.
20. wireless radio frequency identification mark as claimed in claim 17 comprises the current-carrying plate that supports described dielectric body and be connected with an end of the other end of semi-conductor chip and described antenna.
CN2007800010891A 2006-04-19 2007-04-16 RFID antenna and RFID tag Expired - Fee Related CN101351816B (en)

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KR1020060035331A KR100793524B1 (en) 2006-04-19 2006-04-19 RFID antenna, RFID tag and RFID system
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KR10-2006-0035331 2006-04-19
KR1020060037909A KR100793525B1 (en) 2006-04-27 2006-04-27 RFID tag
KR1020060037909 2006-04-27
KR10-2006-0037909 2006-04-27
PCT/KR2007/001832 WO2007119992A1 (en) 2006-04-19 2007-04-16 Rfid antenna and rfid tag

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