CN206224566U - Anti-metal RFID tag and the radio-frequency recognition system including the label - Google Patents
Anti-metal RFID tag and the radio-frequency recognition system including the label Download PDFInfo
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- CN206224566U CN206224566U CN201621319085.0U CN201621319085U CN206224566U CN 206224566 U CN206224566 U CN 206224566U CN 201621319085 U CN201621319085 U CN 201621319085U CN 206224566 U CN206224566 U CN 206224566U
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Abstract
The utility model provides a kind of anti-metal radio frequency identification (RFID) label and the radio-frequency recognition system including the label, belongs to technical field of RFID.The label antenna of the RFID label tag include one on block main radiator substantially symmetrical about its central axis, the main radiator first end set and both sides positioned at the central shaft two inverted L-shapeds fluting, the second end of the main radiator set and two block flutings of both sides positioned at the central shaft, the Y shape being made up of two parts fluting that is set in the main radiator slot.The RIFD labels have that anti-metal characteristic is good, low cost, and thickness is small and the characteristics of bandwidth.
Description
Technical field
The utility model belongs to radio frequency identification (Radio Frequency Identification, RFID) technical field,
It is related to a kind of can be used for the anti-metal RFID label tag of metal surface and the rfid system including the RFID label tag.
Background technology
RFID technique has been widely used in every field extensively, for example, sale of goods, transport, production, useless
The fields such as property management reason, postal tracking, aviation luggage management, vehicle toll management, traditional paper tape bar code is because of its storage capacity
It is small, the shortcomings of can not rewrite, in identification field, it is slowly substituted by rfid system.
Rfid system normally include that multiple RFID label tags, at least one communicate with the RFID label tag with antenna
RFID reader and the computing device for controlling the RFID reader.Normally, RFID label tag by RFID label antenna and
Label chip is constituted；RFID reader includes：For by energy or information provide to RFID label tag transmitter and for from
RFID tag identity and other information；The information that computing device treatment is obtained by RFID reader.RFID reader
Transmitter via antenna export RF (Radio Frequency, radio frequency) signal, so as to produce electromagnetic field, the electromagnetic field is caused
Label returns to the RF signals of carrying information.
In an rfid tag, the radio wave signal produced by electromagnetic field is to be sent to label via its RFID label antenna
Chip, also, the current signal of label chip is sent in space by RFID label antenna.But, ordinary RFID tag
When attaching is applied on the product of metal surface (such as car plate), because metal surface is to the reflex of incident electromagnetic wave,
Stronger opposite direction electromagnetic wave will be had thus produced also through electronic tag, between metal and RFID label tag and closely couple effect
Should so that the parameter such as input impedance, directional diagram, gain, bandwidth of RFID antenna all changes, and then have a strong impact on RFID readings
Reading distance of the device to RFID label tag is taken, or even cannot be read and be caused antenna failure.
Therefore, to avoid application of the above phenomenon limit RFI D labels under metal environment, mainly pass through in the prior art
Following several ways improve reading situation of the RFID label tag under metal environment.
The first is, by adjusting distance between antenna and metal surface in RFID label tag.When antenna and metal surface
The distance between be adjusted to 0.25 λ0When (operation wavelength in vacuum), back wave and work electromagnetism that metal surface is caused
In-phase stacking, the performance of antenna will be maintained even improving by ripple.But the method inevitably makes the thickness of RFID label tag
Degree and volume are greatly increased.
Second is that high-k material is filled between metal surface and the antenna of RFID label tag.The dielectric high is normal
Number material can serve as the substrate or matrix of RFID label tag, such that it is able to shorten the electromagnetic wave ripple between metal surface and antenna
It is long, and make back wave become to contribute to the electromagnetic wave of antenna normal work.For example, Application No. PCT/JP2007/001287
The RFID label tag of EGB (Electromagnetic Band-Gap, electro-magnetic bandgap) structure, this EGB structures are proposed in the world
It is relative complex in structure, it is difficult to fabricate.And this mode depends on high-k material, inevitably brings
The problem of high cost.
In addition, also also have that absorbing material is set in an rfid tag to absorb the settling mode of back wave, for example, IFA
(Inverted F Antenna, reverse F antennas).But, absorbing material absorbs the part electricity for also absorbing RFID reader transmitting
Magnetic wave, causes energy to be easily dissipated in absorbing material, not by RFID label tag (particularly passive tag types) well
Utilize.Also, the setting of absorbing material also inevitably brings the problem of high cost.
In view of this, it is necessary to propose a kind of new anti-metal RFID label tag.
Utility model content
One of the purpose of this utility model be realize RFID label tag can be used for the characteristic of metal surface.
A further object of the present utility model is that reduction can be used for the cost of the RFID label tag of metal surface.
To realize object above or other purposes, the utility model provides following technical scheme.
According to one side of the present utility model, there is provided a kind of anti-metal RFID label tag, including matrix and it is arranged at described
Label antenna and label chip on matrix；The label antenna includes：
One main radiator of bulk, it is on substantially symmetrical about its central axis；
In two inverted L-shapeds fluting of first end setting and positioned at the central shaft the both sides of the main radiator, should
Two L-shaped flutings are on substantially symmetrical about its central axis；
In two block flutings of the setting of the second end and positioned at the central shaft the both sides of the main radiator, this two
Individual sector is slotted on substantially symmetrical about its central axis, wherein what the first end and the second end defined along the central axis direction；
The Y shape being made up of two parts fluting set in the main radiator is slotted, wherein, described two parts slot it
Between form feeder line, two parts of the Y shape fluting are slotted on substantially symmetrical about its central axis；
Wherein, the main radiator and L-shaped fluting are jointly configured as making the label antenna with the label chip
Capacitive is matched, and the block fluting and Y shape fluting are jointly configured as making the label antenna with label chip perception
Matching.
One embodiment of the anti-metal RFID label tag provided according to the utility model, wherein, the feed of the label antenna
Point is located at the interface between the feeder line and the radiant body, and the label chip is placed in the distributing point.
The another embodiment of the anti-metal RFID label tag provided according to the utility model, wherein, in 0.1mm to 13mm scopes
Inside operationally be respectively provided with the width of inverted L-shaped fluting horizontal component and vertical component, with realize label antenna with it is described
Label chip capacitive is matched；And/or the inverted L-shaped fluting is operationally respectively provided with the range of 0.1mm to 15mm
The distance of horizontal component and vertical component and radiant body edge, to realize that label antenna is matched with the label chip capacitive；And
And/or person is respectively provided with the inverted L-shaped fluting horizontal component and vertical component and radiant body edge in the range of 0.1mm to 15mm
Distance, to realize that label antenna is matched with the label chip capacitive.
In the anti-metal RFID label tag of the embodiment any before, it is preferable that the L-shaped fluting mutually hangs down for two sections
Straight fluting is connected and constituted, and the width of every section of fluting is operationally respectively provided with the range of 0.1mm to 13mm.
In the anti-metal RFID label tag of the embodiment any before, alternatively, the main radiator can be rectangle
Square block, trapezoidal square block, square dice shape or fan-shaped block, or can be rectangular block shape, trapezoidal square block, just
The assembly of rectangular block shape and fan-shaped block.
The another embodiment of the anti-metal RFID label tag provided according to the utility model, wherein, in the range of 0mm to 40mm
The radius of the fan-shaped fluting is operationally set, to realize that label antenna is matched with label chip perception；And/or
Three sections of any part of two parts fluting of the Y shape fluting are operationally respectively provided with the range of 0.2mm to 30mm
Wire fluting width, namely three sections of wire fluting width can be arranged to different, with realize label antenna with
The label chip perception matching；And/or the composition Y shape is operationally respectively provided with the range of 0.2mm to 30mm
The length of three sections of wire fluting of any part of two parts fluting of fluting, namely the length of three sections of wire fluting can
It is different to be arranged to, to realize that label antenna is matched with label chip perception.
In the anti-metal RFID label tag of as described before any embodiment, it is preferable that two parts fluting of the Y shape fluting
It is any a part by three sections fluting connections constitute.
Wherein, the Y shape is slotted relatively close second end, and the opening of the Y shape fluting is towards the first end.
In the anti-metal RFID label tag of the embodiment any before, it is preferable that the Y shape fluting is located at the center
At axle, and on substantially symmetrical about its central axis.
In the anti-metal RFID label tag of the embodiment any before, it is preferable that two flutings of the Y shape fluting
Vertical edges of the vertical section relative to the main radiator in three sections of flutings are along substantially parallel setting.
In the anti-metal RFID label tag of the embodiment any before, it is preferable that two flutings of the Y shape fluting
Horizontal segment in three sections of flutings is relative to the substantially parallel setting of the horizontal edge of the main radiator.
In the anti-metal RFID label tag of the embodiment any before, it is preferable that the Y shape fluting is slotted for wire.
In the anti-metal RFID label tag of the embodiment any before, it is preferable that the areal extent of the main radiator
It is 150 square millimeters to 10000 square millimeters；The thickness range of described matrix is 0.1mm to 60mm.
In described anti-metal RFID label tag any before, it is preferable that described matrix is made up of foamed material.
According to another aspect of the present utility model, there is provided a kind of radio-frequency recognition system, it include it is multiple as described above and
Any one anti-metal RFID label tag.
Of the present utility model to have the technical effect that, the flexibility of the shape that the anti-metal RFID label tag passes through label antenna sets
Meter, so that its adjustable setting property is strong, it is easy to realize the impedance between label antenna and label chip under metal environment
Match somebody with somebody, it is therefore convenient to using with metal surface.Also, the thickness and/or material of the matrix of RFID label tag are not relied on,
Low cost, thickness is small and small volume.
Brief description of the drawings
From described further below with reference to accompanying drawing, it will make above and other purpose of the present utility model and advantage more
It is fully apparent from, wherein, same or analogous key element is adopted and is indicated by the same numeral.
Fig. 1 is the structural representation of the anti-metal RFID label tag provided according to the utility model first embodiment.
Fig. 2 is the structural representation of the anti-metal RFID label tag provided according to the utility model second embodiment.
Fig. 3 is the structural representation of the anti-metal RFID label tag provided according to the utility model 3rd embodiment.
Specific embodiment
What is be described below is multiple some that may be in embodiment of the present utility model, it is desirable to provide to of the present utility model
Basic understanding, it is no intended to confirm of the present utility model crucial or conclusive key element or limit scope of the claimed.Easily
Understand, according to the technical solution of the utility model, in the case where connotation of the present utility model is not changed, the general technology of this area
Personnel can propose other implementations that can mutually replace.Therefore, detailed description below and accompanying drawing are only to this reality
With the exemplary illustration of new technical scheme, and it is not to be construed as whole of the present utility model or is considered as to the utility model
Technical scheme is defined or limited.
Fig. 1 show the structural representation of the anti-metal RFID label tag provided according to the utility model first embodiment.Such as
Shown in Fig. 1, label 10 includes matrix 1000, label chip 900 and the label antenna being placed on the matrix, label chip 900
It is placed at the distributing point 100 of label antenna.Label antenna includes one on the symmetrical block radiant body 160, position of central shaft 150
In one end both sides of radiant body 160 and on the symmetrical inverted L-shaped fluting 140 of central shaft 150, positioned at the other end both sides of radiant body 160
And on central shaft 150 it is symmetrical fall fan-shaped fluting 130, positioned near 130 one end of fan-shaped fluting and symmetrical on central shaft 150
Y shape fluting 120 and positioned at Y types fluting 120 formed feeder lines 110 on distributing point 100.
RFID label antenna can be formed on matrix 1000 (as shown in FIG. by method compositions such as printing, etchings
Shape), so as to form flat plane antenna；Label chip 900 is placed at the distributing point 100 of RFID label antenna.
Structure first to the planar tags antenna of RFID label tag shown in Fig. 1 is described in detail.
As shown in figure 1, label antenna is a radiant body for bulk 160, it is symmetrical on a central shaft 150.Primary radiation
The shape of body 160 can be rectangle, trapezoidal, fan-shaped, square or combinations thereof body etc., but its concrete shape is not by this
Utility model embodiment is limited.Bulk is set to by by main radiator, its effective radiating area is larger, mark can be effectively improved
Sign the entire gain and RCS (Radar Cross-Section, RCS) value of antenna.
The areal extent of radiant body 160 is 150 square millimeters to 10000 square millimeters.Both sides are set at the top of radiant body
There are two on inverted L-shaped fluting 140 substantially symmetrical about its central axis.The inverted L-shaped fluting 140 connects structure by level fluting and vertical channel
Into；Wherein, horizontal groove width may range from 0.1mm to 13mm, such as 1mm, and the width range of vertical channel can be
0.1mm to 13mm, such as 1mm；The length range of level fluting can be 0.2mm to 30mm, such as 10mm, the length of vertical channel
Degree may range from 0.2mm to 30mm, such as 20mm.The corresponding side level of inverted L-shaped 140 horizontal components of fluting and radiant body 160
The distance range at edge can be 0.1mm to 15mm, such as 1mm, the vertical edges edge of the corresponding side of vertical component and radiant body 160
Distance range can be 0.1mm to 15mm, such as 1mm.
As shown in figure 1, the two bottom sides of radiant body 160 are provided with two slotted on bulk substantially symmetrical about its central axis, for example
The base angle both sides of rectangular radiant body 160 are slotted to form fan-shaped fluting 130 as shown in Figure 1, the radius of sector fluting 130
Scope be 0mm to 40mm, such as 15mm.In other alternative embodiments, sector fluting 130 can also set triangularity and open
Groove 230 (as shown in Figure 2) or square block are slotted, and 330 (as shown in Figure 3) etc. are block to slot；Certainly, in other embodiments,
Can set in echelon or box-shaped and trapezoidal assembly, it is not limited to the shape that the utility model is mentioned.
It should be noted that above-mentioned " horizontal component " and " vertical component " are the RFID relative to the embodiment illustrated in fig. 1
Come what is defined, they are relative concept in the placement orientation of label.When the placement orientation of RFID label tag changes, its
Relative change therewith.
Continue as shown in figure 1, label antenna also includes the Y shape fluting 120 near 130 one end of fan-shaped fluting.In the implementation
In example, the opening of Y shape fluting 120 towards one end of inverted L-shaped fluting 140, and on substantially symmetrical about its central axis.Y shape fluting 120 by
Two parts fluting composition of the left and right sides of central axis, is isolated and on central shaft pair between two parts fluting by radiant body
Claim；Any part of two parts fluting can be made up of three sections of wire fluting connections, and every section of width slotted and/or length are all
(such as 5mm) can be configured in the range of 0.2mm to 30mm, usually, three sections of flutings there can be identical width；And
And, every section of fluting is parallel with the edge of radiant body 160 or vertical in the horizontal and/or vertical.In other embodiments, group
Three sections of flutings into Y shape fluting 120 can also be arranged to have certain angle with the edge of radiant body 160, such as 15 °.
Distributing point 100 is slotted the feeder line 110 to be formed and the junction of radiant body 160, therefore the distance of distributing point 100 positioned at Y shape
Radiant body 160 may range from 0.2mm to 20mm, such as 3mm.Wherein, feeder line 110 is at least partially disposed at Y shape fluting 120
Between two parts fluting and on central shaft 150.
In actual applications, the impedance of label chip 900 can be expressed as (A '+B ' j) ohm, wherein, " A ' " represents resistance
Anti- real part, " B ' " represents the imaginary part of impedance；The label antenna impedance of RFID label tag can be expressed as (A+Bj) ohm, wherein,
" A " represents the real part of impedance, and " B " represents the imaginary part of impedance.In the utility model, the big I of real part of the impedance of label antenna
Adjusted with setting the area of main radiator 160 by adjusting, and/or by setting the feature size of inverted L-shaped fluting 140
To adjust；The fan-shaped fluting 130, Y shape that the imaginary part size of the impedance of label antenna can set label antenna by adjusting is slotted
130 feature size is adjusted, for example, the length of the horizontal segment part of regulation Y shape fluting 120, and/or regulation sector is opened
Radius of groove 130 etc..
To realize that RFID label antenna is transmitted with label chip ceiling capacity, it is necessary to realize the conjugation of the two impedance as far as possible
Match somebody with somebody, namely (A '+B ' j)=(A+Bj).Therefore, it is necessary to make to realize capacitive between the RFID label antenna and the label chip 900
Matching, namely the real part of both impedances is of substantially equal (A '=A)；It is necessary that realizing the RFID label antenna and the label core
Perception matching between piece 900, namely the real part of both impedances is of substantially equal (B '=B).In the utility model, by regulation
Set main radiator 160 area come realize the basic capacitive between RFID label antenna and the label chip 900 match (namely
A ' is substantially equal to A), for example, in 150mm2To 10000mm2In the range of adjust set main radiator 160 area (be such as set to
600mm2) realize；RFID label antenna is realized by adjusting the shape facility size of fan-shaped fluting 130, Y shape fluting 120
Basic perception between the label chip 900 matches (namely B ' is substantially equal to B), for example, being adjusted in the range of 0mm to 40mm
The radius (being such as set to 12mm) of the fan-shaped fluting 130 is set, or regulation is set respectively in the range of 0.2mm to 30mm
Three sections of width (being such as set to 1mm or 2mm) of fluting of composition Y shape fluting 120, or in the range of 0.2mm to 30mm
Regulation respectively sets composition Y shape three sections of 120 length (being such as set to 8mm or 20mm) of fluting of fluting, also or by with
Any combination of upper several ways is matched come the basic perception realized jointly between label antenna and the label chip 900.Therefore,
When the RFID label tag is applied to metal surface environment, the design flexibility of RFID label antenna is greatly increased, and is become according to environment
Change can be with adjusted design RFID label antenna, it is easy to label antenna is realized impedance matching with environmental change, eliminates metal
Reflect the influence to RFID label tag.
It should be noted that regulation sets three sections of flutings of composition Y shape fluting 120 respectively in the range of 0.2mm to 30mm
Width and/or during length, groove width/or length per segment section can be with unequal, i.e., three sections flutings can be respective respectively
Its width/or length are adjusted, so as to be conducive to adjustment electric current to lead to resistance degree, realize that trickle impedance is adjusted.
Further, in the case of strong by tag antenna design flexibility of the present utility model, RFID label tag 10 it is anti-
Metallic character is not rely on matrix 1000, for example, matrix 1000 no longer needs to select high-k material, matrix
1000 thickness is also without being set to 0.25 λ0, therefore, the cost of RFID label tag 10 can be substantially reduced, and thickness can also drop
It is low.In this embodiment, matrix 1000 can be with alternative costs are relatively high but radioresistance characteristic is good FR4 (epoxy glass fabric), poly-
The material such as ethene (polyethene) or polyester (polyester), it is also possible to the material such as foam of alternative costs.RFID label tag day
The integral thickness of line 10 can also be arranged in the range of 0.1mm to 60mm (such as 5mm), therefore, while anti-metal, thickness
It is relatively small.
Setting is changed by the shape to the label antenna in embodiment illustrated in fig. 1, following examples can be obtained
RFID label tag.
The planar structure that Fig. 2 show the anti-metal RFID label tag provided according to the utility model second embodiment is illustrated
Figure.As shown in Fig. 2 label 20 is equally including matrix 1000, label chip 900 and the label antenna being placed on the matrix, mark
Chip 900 is signed to be placed at the distributing point 200 of label antenna.Label antenna includes one on the symmetrical block spoke of central shaft 250
Beam 260, positioned at one end both sides of radiant body 260 and on central shaft 250 it is symmetrical inverted L-shaped fluting 240, positioned at radiant body 260
Other end both sides and on central shaft 250 it is symmetrical triangle fluting 230, positioned near triangle slot 230 one end and on
The symmetrical Y shape fluting 220 of central shaft 250 and the distributing point 200 on the feeder line 210 formed positioned at Y types fluting 220.Relatively
With the label antenna of embodiment illustrated in fig. 1, its difference is the difference between fan-shaped fluting 130 and triangle fluting 230.
The planar structure that Fig. 3 show the anti-metal RFID label tag provided according to the utility model 3rd embodiment is illustrated
Figure.As shown in figure 3, label 30 is equally including matrix 1000, label chip 900 and the label antenna being placed on the matrix, mark
Chip 900 is signed to be placed at the distributing point 300 of label antenna.Label antenna includes one on the symmetrical block spoke of central shaft 350
Beam 360, positioned at one end both sides of radiant body 360 and on central shaft 350 it is symmetrical inverted L-shaped fluting 340, positioned at radiant body 360
Other end both sides and on the symmetrical rectangular slot 330 of central shaft 350, positioned near one end of rectangular slot 330 and on center
The symmetrical Y shape fluting 320 of axle 350 and the distributing point 300 on the feeder line 310 formed positioned at Y types fluting 320.Relative and Fig. 1
The label antenna of illustrated embodiment, its difference is the difference between fan-shaped fluting 130 and rectangular slot 330.
Same section in figure 2 above to the RFID label tag of embodiment illustrated in fig. 3 with the RFID label tag of embodiment illustrated in fig. 1
Setting and operation principle no longer describe one by one, similarly, the RFID label tag of Fig. 2 to Fig. 3 embodiments can apply to metal watch
In the environment in face, anti-metal characteristic is good.
The utility model provides rfid system simultaneously, it include described in multiple above example RFID label tag (10,
20 or 30), the rfid system also includes RFID reader with antenna and for controlling the calculating of the RFID reader to fill
Put.RFID reader and computing device are fully able to the part of realization for those skilled in the art, no longer describe one by one herein.
Example above primarily illustrates RFID label tag of the present utility model and its rfid system.Although only to some of them sheet
The implementation method of utility model is described, but those of ordinary skill in the art are it is to be appreciated that the utility model can be
Implement in many other forms with scope without departing from its spirit.Therefore, the example for being shown is considered as showing with implementation method
Meaning property and it is nonrestrictive, do not departing from the situation of the utility model spirit and scope as defined in appended claims
Under, the utility model may cover various modifications and replace.
Claims (9)
1. a kind of anti-metal RFID tag, including matrix and the label antenna and label that are arranged on described matrix
Chip, it is characterised in that the label antenna includes：
One main radiator of bulk, it is on substantially symmetrical about its central axis；
In two inverted L-shapeds fluting of first end setting and positioned at the central shaft the both sides of the main radiator, two L
Shape is slotted on substantially symmetrical about its central axis；
In two block flutings of the setting of the second end and positioned at the central shaft the both sides of the main radiator, this two fans
Shape is slotted on substantially symmetrical about its central axis, wherein what the first end and the second end defined along the central axis direction；
The Y shape being made up of two parts fluting set in the main radiator is slotted, wherein, shape between two parts fluting
Into feeder line, two parts of the Y shape fluting are slotted on substantially symmetrical about its central axis；
Wherein, the main radiator and L-shaped fluting are jointly configured as making the label antenna with the label chip capacitive
Matching, the block fluting and Y shape fluting are jointly configured as making the label antenna be matched with label chip perception.
2. anti-metal RFID tag as claimed in claim 1, it is characterised in that the distributing point of the label antenna is located at
Interface between the feeder line and the main radiator, the label chip is placed in the distributing point.
3. anti-metal RFID tag as claimed in claim 1, it is characterised in that the block fluting is slotted for fan-shaped.
4. anti-metal RFID tag as claimed in claim 1, it is characterised in that the block fluting is triangle fluting
Or square block fluting.
5. anti-metal RFID tag as claimed in claim 1, it is characterised in that the main radiator is oblong-shaped,
The block fluting is arranged on the base angle at the second end of the main radiator of oblong-shaped.
6. anti-metal RFID tag as claimed in claim 1, it is characterised in that the Y shape fluting is relatively close described
The opening of the second end and Y shape fluting is towards the first end.
7. the anti-metal RFID tag as described in claim 1 or 6, it is characterised in that two parts of the Y shape fluting are opened
Any part of groove is made up of three sections of wire fluting connections.
8. anti-metal RFID tag as claimed in claim 2, it is characterised in that the distributing point is located at the central shaft
On.
9. a kind of radio-frequency recognition system, it is characterised in that penetrated including multiple anti-metal as any one of claim 1-8
Frequency identification tag.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201621319085.0U CN206224566U (en) | 2016-11-23 | 2016-11-23 | Anti-metal RFID tag and the radio-frequency recognition system including the label |
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| CN201621319085.0U CN206224566U (en) | 2016-11-23 | 2016-11-23 | Anti-metal RFID tag and the radio-frequency recognition system including the label |
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| CN206224566U true CN206224566U (en) | 2017-06-06 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110866581A (en) * | 2018-08-28 | 2020-03-06 | 江苏省质量和标准化研究院 | Anti-metal antenna radio frequency identification tag and radio frequency identification system comprising same |
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2016
- 2016-11-23 CN CN201621319085.0U patent/CN206224566U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110866581A (en) * | 2018-08-28 | 2020-03-06 | 江苏省质量和标准化研究院 | Anti-metal antenna radio frequency identification tag and radio frequency identification system comprising same |
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