CN109840579A - Three-dimensional Split-ring resonator Meta Materials wireless radio frequency identification mark - Google Patents
Three-dimensional Split-ring resonator Meta Materials wireless radio frequency identification mark Download PDFInfo
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- CN109840579A CN109840579A CN201711208423.2A CN201711208423A CN109840579A CN 109840579 A CN109840579 A CN 109840579A CN 201711208423 A CN201711208423 A CN 201711208423A CN 109840579 A CN109840579 A CN 109840579A
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- conductive
- label tag
- rfid label
- antenna
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Abstract
The present invention relates to a kind of for increasing sub- gigahertz (Sub-GHz) low profile 3D SRR (three-dimensional Split-ring resonator) Meta Materials of radio frequency identification range.Meta Materials are made of the sub-wavelength structure periodically placed, to generate the specific effect to incident electromagnetic wave.In general, electromagnetism Meta Materials are 1/2 wavelength dimensions, and these Meta Materials are commonly used in the frequency applications from 10GHz to 20GHz.Sub-GHz is applied, unit size is really fixed too big, has limited to Meta Materials in the application of sub-GHz.The present invention is provided to a kind of low shape ultralow frequency design of material of innovation of UHF (hyperfrequency) RFID (radio frequency identification) label, and the labeling task is in 860MHz to 960MHz.This Meta Materials are a kind of 3D SRR (three-dimensional Split-ring resonator) structures of innovation.The design of this 3D SRR structure permeable model, simulation and test, reach the specific effect of expected ultralow frequency.Since Meta Materials can inhibit the propagation of surface wave, the radiation efficiency of this Meta Materials is also very high.
Description
Technical field
The present invention relates to a kind of for increasing sub- gigahertz (Sub-GHz) the low profile 3D SRR (three of radio frequency identification range
Tie up Split-ring resonator) Meta Materials.For UHF (hyperfrequency) RFID (radio frequency identification) label application, the read range of label compared with
Existing radio frequency identification (RFID) label is winning.
Background technique
(RFID) label of radio frequency identification on object is attached to many purposes.RFID label tag has antenna, usually occasionally
Pole type.Antenna is commonly used in transmitting or receives hyperfrequency (UHF) signal, RFID label antenna and RFID data reader
Antenna communication, read electric power and Data Data.Radio frequency identification (RFID) label is affixed on the object to be tracked.Object
Electromagnetic property will affect the impedance of radio frequency identification (RFID) antenna, bandwidth and radiation efficiency.When RFID antenna is close to conductive body
When, this influence to antenna is strongly.In fact, radio frequency (RFID) label with dipole-type antenna is being connected to conductive material
It may not work when body.If it is desired to track conductive body (such as object of metal can or foil package), then difficulty can be brought.
Meta Materials are the broad definitions of resonance and disresonance artificial material.There are several widely used Meta Materials, i.e. frequency
It selects surface (FSS), electro-magnetic bandgap (EBG) and negative index materials (NIM).Meta Materials have many unique properties, such as negative to be situated between
Electric constant and permeability.These Meta Materials are usually built up by Periodic dielectric material and various conductive patterns.Meta Materials have
The electromagnetic property that novel nature is not present has a wide range of applications in antenna and wave field communication sphere.With inhibition
The Meta Materials of the forbidden band of surface wave may be used as the ground plane of dipole antenna, to realize low configuration design.The forbidden band of meta-materials
Width is defined by its surface wave or reflection phase character.The size of components of this Meta Materials is arranged according to the sequence of wavelength, limitation
Its application in sub- GHz application.For example, the wavelength of 1GHz is about 300 millimeters.The unit block of traditional Meta Materials needs
300 millimeters of rank.
Split-ring resonator (SRR) is a kind of Meta Materials for sub-wavelength dimensions.SRR unit is by two concentric ring groups
At dividing in the opposite direction.Fig. 1 and Fig. 2 shows the structure of two kinds of SRR.Open-loop resonator (SRR) is common super material
One of material.Using the cyclic array of division toroidal cavity resonator, negative magnetoconductivity is realized.It is different from traditional natural material, SRR
Strong magnetic coupling is generated with its electromagnetic field.This unique magnetic susceptibility makes that it is suitable for various electromagnetic applications.(driffractive ring is humorous by SRR
Vibration device) it is a kind of structure manually prepared, strong magnetic coupling is presented with electromagnetic field.
From the perspective of equivalent circuit, SRR is considered as the lc circuit with natural resonance frequency.In specific frequency
In range, cause powerful circulating current across the magnetic flux of SRR, to generate effective magnetic moment.This induction magnetic moment is opposite
The effect with phase or reverse phase is made in external magnetic field.Win the read range of the RFID label tag based on 3D SRR far existing wireless
Radio frequency identification (RFID) label.It includes slim, the light-weight advantage low with manufacturing cost that this material, which has more,.
Summary of the invention
As described in part above, unit block can be modeled as lumped circuit model.It is internal in order to reduce resonance frequency
Capacitor and inductance need to increase.Forbidding band gap is to be determined by the inductance and capacitor of unit, but the natural capacity of SRR and inductance are very
It is small.In order to increase intrinsic capacitor and inductance, need to design a kind of novel 3D SRR.This new design is as shown in figure 3, one
Sheet metal is folded to overwrite media core.Dielectric core is made of dielectric constant of 2.2 PE.Conductive layer is made of aluminum.It was found that should
The natural capacity of model is much higher than traditional SRR.Top layer is used as load capacitance, and two current-carrying parts of ground connection are as inductance.It hangs down
The impedance of straight incoming electromagnetic wave surface is shown below
Wherein Z is surface impedance, and ω is the frequency of incident electromagnetic wave, and L is thin slice inductance, and C is thin slice capacitor.
So surface impedance becomes infinitely great when frequency is following:
SRR is one of most important Meta Materials modular construction.The main body that metamaterial unit itself is radiated as wireless Bi.Electricity
Magnetic Meta Materials are the composite materials with specific electromagnetic property designed on sub-wavelength dimensions.By carefully designing Meta Materials list
Member can achieve the function of beyond tradition.The influence of metal environment is one of maximum challenge in RFID application.Unit Meta Materials quilt
As RFID antenna, in order to reduce resonance frequency, internal capacitance and inductance need to increase.Forbid band gap be by unit inductance and
Capacitor determines.Three-dimensional S RR is that covering dielectric core is folded to by piece of metal.Dielectric core is made of high dielectric constant.It leads
Electric layer is made of metal.The natural capacity of the model is much higher than traditional SRR.Top layer be used as load capacitance, two of ground plane
Current-carrying part is as inductance.Metamaterial unit forms pattern on substrate.RFID chip inlay is wrapped in substrate by RFID label tag
On, form Meta Materials unimodule.In order to further decrease unit size, third layer is increased, in the structure to increase more
Natural capacity, as shown in Figure 3.Unit resonance frequency depends on the resonance frequency of intrinsic circuit model.Additional metal layer can be with
Resonance frequency is reduced, thus reduction unit size.
Detailed description of the invention
Fig. 1 shows SRR unit, wherein
C copper sheet width
D stand-off distance
R radius
A unit size
Fig. 2 shows rectangular SRR design, wherein
L: unit cell dimension
The outer length of D1:SRR
The inner ring outer length of D2:SRR
G: annular segmentation width
W: the width of annular trace
S: the distance between ring: the thickness of substrate
Fig. 3 is the design of three layers of 3D SRR；
Fig. 4 is SRR RFID label tag example, wherein (a) is the double-layer structure being folded on PE substrate.There is no conductive substrate
Connection top and bottom conductive layer (b) is the double-layer structure being folded in PE substrate.Conductive substrate connection top and bottom are conductive
Layer.It (c) is the three-decker being folded on PE substrate.The conductive substrate at connection top and bottom conductive layer.In PE bottom and one
There are also additional conductive layers between a conductive substrate.
Specific embodiment
Below with reference to embodiment, to low profile three-dimensional Split-ring resonator Meta Materials wireless radio frequency identification mark of the invention
It is described further:
As shown in table 1, for identical resonance frequency, the size of three layers of three-dimensional S RR is the one third of three layers of SRRR.
SRR is one of most important Meta Materials modular construction.Metamaterial unit itself is used as the main body of wireless wave radiation.Electricity
Magnetic Meta Materials are the composite materials with specific electromagnetic property designed on sub-wavelength dimensions.By carefully designing Meta Materials list
Member can achieve the function of beyond tradition.The influence of metal environment is one of maximum challenge in RFID application.Unit Meta Materials quilt
As RFID antenna, in order to reduce resonance frequency, internal capacitance and inductance need to increase.Forbid band gap be by unit inductance and
Capacitor determines.Three-dimensional S RR is that covering dielectric core is folded to by piece of metal.The PE that dielectric core is 2.2 by dielectric constant
It is made.Conductive layer is made of aluminum, structure example as Figure 4 shows.The natural capacity of the model is much higher than traditional SRR.Top
Layer is used as load capacitance, and two current-carrying parts of ground plane are as inductance.Metamaterial unit is on aluminium (PE) (polyethylene) substrate
Form pattern.Then, the RFID inlay of formation is wrapped on PE substrate, forms Meta Materials unimodule.In order to further decrease
Third layer is added in structure to increase natural capacity by the size of unit cell.The resonance frequency of unit depends on circuit
Resonance.Additional metal layer can reduce resonance frequency, thus reduction unit size.The bright discovery of simulation knot is for identical resonance
Frequency, the size of three layers of three-dimensional S RR are only the one third of two layers of three-dimensional S RR.The radiation gain of SRR unit and the thickness of unit
It is highly relevant.It will be apparent that gain increases to 3dB from -5dB, thickness increases to 5mm from 0.5mm.When thickness is more than 5mm, gain
It can decline.This is to say, resonance frequency is transferred to lower frequency by thicker unit.104mm x 30mm x 5mm type is certainly
By the reading distance in space up to 19 meters, and the reading distance on metal is up to 30 meters.42mm x 15mm x 5mm type is read
Range is up to 8 meters, and the read range on metal is also up to 10 meters.The reading distance of 15mm x 5mm x 5mm type is up to 3.5
Rice.
Unit block works as both lumped circuit components.For model 1, dielectric substance is reinstated with two metal plates one
Make capacitor, and the metal plate wrapped up serves as inductor.For model 2, top and bottom metal plate is by metal plate short circuit.
Internal inductance increases, and the size of unit can reduce.For model 3, it is inserted into additional metal plate, this considerably increases intrinsic electricity
Hold.It can be substantially reduced the size of structure cell in this way.In this case, the size of model 3 is 1/10 and the model 1 of model 2
1/20 size.Electric field forms standing wave at resonant frequency, and surface wave is suppressed, and radiation efficiency reaches maximum.
Sub- gigahertz (Sub-GHz) slim 3D SRR (three-dimensional Split-ring resonator) Meta Materials of the invention can be applied
Radio frequency identification (RFID) label.Measurement result proves that the read range of the RFID label tag based on 3D SRR far wins existing
Radio frequency identification (RFID) label.
Claims (15)
1. a kind of Meta Materials RFID label tag, comprising:
A) RFID chip for storing data；
B) RFID chip and the antenna with working frequency are connected to；With
C) the Meta Materials electro-magnetic bandgap top Gu bottom plate being located near the antenna, electro-magnetic bandgap gap top Gu bottom plate have in institute
State the reflected phase under the working frequency of antenna different from 180 °.
2. RFID label tag according to claim 1, wherein the phase reflection phase is under the working frequency of the antenna
It is zero.
3. RFID label tag according to claim 1, which is characterized in that the working frequency of the antenna be 750MHZ extremely
960MHZ。
4. RFID label tag according to claim 1, which is characterized in that the working frequency of the antenna be 5.0GHz~
6.0GHz。
5. RFID label tag according to claim 1, wherein the electro-magnetic bandgap substrate has the frequency of 750MHz to 960MHz
Zero phase reflection under rate.
6. RFID label tag according to claim 1, wherein the electro-magnetic bandgap substrate have 2.0GHZ and 2.6GHZ it
Between frequency under zero phase reflect phase.
7. RFID label tag according to claim 1, wherein the electro-magnetic bandgap substrate have 5.0GHZ and 6.0GHZ it
Between frequency under zero phase reflection.
8. RFID label tag according to claim 1, wherein the electro-magnetic bandgap lining has the first conductive layer, second is conductive
Layer and public conductive ground layer, the first and second conductive layers, the first and second conductive layers and the second conductive layer described in circuit connection
Has dielectric between earth plate.
9. RFID label tag according to claim 1 is led wherein first conductive layer is located at the antenna with described second
Between electric layer.
10. RFID label tag according to claim 1, wherein there are air gaps between the antenna and first conductive layer
Or dielectric.
11. RFID label tag according to claim 1, wherein the antenna is installed to the side of substrate, and the substrate
Opposite side be installed to the article to be tracked by the RFID label tag.
12. RFID label tag according to claim 1, wherein there are two have three-dimensional splitting ring for electromagnetic bandgap structure tool
The conductive layer of resonator structure, the three-dimensional Split-ring resonator are formed by two layers of conductive sheet with conductive trace, top conductive
Piece is connected to bottom conductive piece by conductive trace.
13. RFID label tag according to claim 1, wherein there are two have three-dimensional splitting ring for electromagnetic bandgap structure tool
The conductive layer of resonator structure, the three-dimensional Split-ring resonator are formed by two layers of Electricity conductive plaster with conductive trace, another layer
Under bringing to Front, top conductive piece is connected to bottom conductive piece by conductive trace.
14. a kind of antenna system being used together with RFID label tag, the system comprises electro-magnetic bandgap substrate, the electro-magnetic bandgap
Substrate includes the first conductive layer, and the second conductive layer is electrically connected to the public conductive earth plate of first and second conductive layer, the
One and second conductive layer and second conductive layer and the earth plate；And the antenna close to the installation of the first conductive layer.
15. antenna system according to claim 14, wherein there is electricity between first conductive layer and the antenna
Medium or air gap.
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| CN201711208423.2A CN109840579A (en) | 2017-11-27 | 2017-11-27 | Three-dimensional Split-ring resonator Meta Materials wireless radio frequency identification mark |
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| CN201711208423.2A CN109840579A (en) | 2017-11-27 | 2017-11-27 | Three-dimensional Split-ring resonator Meta Materials wireless radio frequency identification mark |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110336125A (en) * | 2019-06-10 | 2019-10-15 | 重庆大学 | A kind of dual-polarized, microstrip filter antenna based on SRR |
| CN110690580A (en) * | 2019-09-18 | 2020-01-14 | 中国科学院国家空间科学中心 | Terahertz low-loss two-dimensional multi-beam super-surface antenna and design method thereof |
| CN113437500A (en) * | 2021-06-03 | 2021-09-24 | 中国电子科技集团公司第三十八研究所 | Three-dimensional SRRs-based metamaterial microstrip antenna and manufacturing method thereof |
| CN117120279A (en) * | 2021-04-09 | 2023-11-24 | 利腾股份有限公司 | Tyre comprising split-ring resonator |
-
2017
- 2017-11-27 CN CN201711208423.2A patent/CN109840579A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110336125A (en) * | 2019-06-10 | 2019-10-15 | 重庆大学 | A kind of dual-polarized, microstrip filter antenna based on SRR |
| CN110336125B (en) * | 2019-06-10 | 2020-10-30 | 重庆大学 | Dual-polarization microstrip filtering antenna based on SRR |
| CN110690580A (en) * | 2019-09-18 | 2020-01-14 | 中国科学院国家空间科学中心 | Terahertz low-loss two-dimensional multi-beam super-surface antenna and design method thereof |
| CN117120279A (en) * | 2021-04-09 | 2023-11-24 | 利腾股份有限公司 | Tyre comprising split-ring resonator |
| CN113437500A (en) * | 2021-06-03 | 2021-09-24 | 中国电子科技集团公司第三十八研究所 | Three-dimensional SRRs-based metamaterial microstrip antenna and manufacturing method thereof |
| CN113437500B (en) * | 2021-06-03 | 2022-12-16 | 中国电子科技集团公司第三十八研究所 | Three-dimensional SRRs-based metamaterial microstrip antenna and manufacturing method thereof |
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Application publication date: 20190604 |