CN106654524A - Double-layer structured broadband UHF RFID anti-metal tag antenna - Google Patents
Double-layer structured broadband UHF RFID anti-metal tag antenna Download PDFInfo
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- CN106654524A CN106654524A CN201611243824.7A CN201611243824A CN106654524A CN 106654524 A CN106654524 A CN 106654524A CN 201611243824 A CN201611243824 A CN 201611243824A CN 106654524 A CN106654524 A CN 106654524A
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- 239000002184 metal Substances 0.000 title claims abstract description 42
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 42
- 230000008878 coupling Effects 0.000 claims abstract description 17
- 238000010168 coupling process Methods 0.000 claims abstract description 17
- 238000005859 coupling reaction Methods 0.000 claims abstract description 17
- 239000004593 Epoxy Substances 0.000 claims description 3
- 239000003365 glass fiber Substances 0.000 claims description 3
- 238000012545 processing Methods 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 9
- 238000012360 testing method Methods 0.000 description 7
- 238000005259 measurement Methods 0.000 description 6
- 238000013461 design Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- PEZNEXFPRSOYPL-UHFFFAOYSA-N (bis(trifluoroacetoxy)iodo)benzene Chemical compound FC(F)(F)C(=O)OI(OC(=O)C(F)(F)F)C1=CC=CC=C1 PEZNEXFPRSOYPL-UHFFFAOYSA-N 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 230000010287 polarization Effects 0.000 description 2
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 2
- 239000004810 polytetrafluoroethylene Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000021615 conjugation Effects 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- 239000003989 dielectric material Substances 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- -1 polytetrafluoroethylene Polymers 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
Classifications
-
- 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
-
- 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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- Variable-Direction Aerials And Aerial Arrays (AREA)
Abstract
The invention discloses a double-layer structured broadband UHF RFID anti-metal tag antenna. The double-layer structured broadband UHF RFID anti-metal tag antenna comprises an upper dielectric plate, a lower dielectric plate and a tag chip; a quasi-dipole antenna is printed on the upper surface of the upper dielectric plate; metal patches are wrapped at the upper surface, the lower surface and the two sides of the lower dielectric plate; a rectangular coupling aperture is formed in the metal patch at the upper surface; the tag chip is located at the position opposite to the coupling aperture at the upper surface of the upper dielectric plate and is connected with the quasi-dipole antenna; the quasi-dipole antenna is provided with a central groove and quadrate grooves in even number; the central groove lengthways runs through the middle part of the quasi-dipole antenna to contain the tag chip; and the quadrate grooves are distributed lengthways and are located at the two sides of the central groove. The double-layer structured broadband UHF RFID anti-metal tag antenna leaves out short-circuited pin nails or short-circuited through holes, reduces the processing difficulty, is steady in working state, can match various tag chips with different impedances and has the advantages such as small size, wide bandwidth and far identification distance.
Description
Technical field
The present invention relates to label antenna field, particularly a kind of double-decker broadband UHF RFID anti-metal tags day
Line.
Background technology
During RF identification (Radio Frequency Identification) technology originates from World War II
Identification of friend or foe, be a kind of non-contact automatic identification technology realized based on radio communication principle and Principles of Radar.UHF
The RFID technique (860～960MHz) of frequency range has the advantages that stable work in work, identification apart from remote, with low cost, therefore extensive
Be applied to logistics supply, warehousing management, commodity retail and the production automation management etc. field.
Passive RFID tags are made up of label antenna and chip, common uhf band RFID label chip impedance representative value
For real part tens of Ohms, the hundreds of ohms of imaginary part, in order that label antenna is operated under good performance state, label antenna should be made
Input impedance reaches conjugate match with the impedance of label chip.For reduces cost and production difficulty, general label antenna is usual
Using be all dipole structure antenna and its deformation, however, but when label is placed in metal object surface, the input of label
Impedance, directional diagram and gain can all produce rapidly decay, cause antenna failure.In order to solve metal environment to label antenna work
Make the problem of performance impact, people did many researchs, such as adhere to EBG (Electronic Band below label antenna
Gap) dielectric material or artificial magnetic conductor AMC (Artificial Magnetic Conductor) material, change reflection wave phase
So as to improve the performance of label antenna, but this method often high cost, difficulty of processing are big；Also with good grounds PIFA antennas need to make
For the characteristic of metal floor, using metal surface as floor PIFA type label antennas, but this kind of structure generally requires short-circuit pin
Nail or paster are connected antenna with floor, improve difficulty of processing.
Traditional anti-metal tag antenna can all pass through shorting pin, short-circuit through hole or short-circuit patch by label antenna and ground
It is connected come the impact for eliminating metal surface to label antenna performance, but can so increases volume, the production difficulty of label antenna
And cost, and the size of metal surface can produce certain impact to the performance of anti-metal tag antenna.
The content of the invention
Present invention is primarily targeted at overcome drawbacks described above of the prior art, propose one kind eliminate shorting pin or
Short-circuit through hole, difficulty of processing is reduced, reduce the size of antenna, improve double-decker broadband UHF of the gain of antenna
RFID anti-metal tag antennas.
The present invention is adopted the following technical scheme that：
A kind of double-decker broadband UHF RFID anti-metal tag antennas, including top dielectric plate, layer dielectric plate and
Label chip；The top dielectric plate upper surface is printed with class dipole antenna；The upper surface of the layer dielectric plate, lower surface and two
Side is enclosed with metal patch, and the metal patch of upper surface offers the coupling gap of rectangle；The label chip is situated between positioned at upper strata
It is connected at the upper surface opposing coupler gap of scutum and with class dipole antenna；Such dipole antenna is provided with central channel and even number
Individual square groove；Longitudinally through such dipole antenna middle part of the central channel is accommodating the label chip；The square groove is longitudinal cloth
Put and positioned at the both sides of the central channel.
Preferably, the square groove includes the first square groove extended downwardly along the class dipole antenna upper end, institute
State central channel both sides and be equipped with least 1 first square groove.
Preferably, the square groove includes the second square groove upwardly extending along the class dipole antenna lower end, institute
State central channel both sides and be equipped with least 1 second square groove.
Preferably, the square groove quantity of the central channel both sides is identical and parallel to each other.
Preferably, the top dielectric plate adopts dielectric constant for 4.4, and tangent loss angle is 0.02 epoxy glass fiber
Plate, thickness is between 1mm-2mm.
Preferably, the width in the coupling gap is between 2.5mm-4mm.
Preferably, the layer dielectric plate adopts dielectric constant for 3.55, and tangent loss angle is 0.002 polytetrafluoroethylene (PTFE)
Plate, thickness is between 2mm-4mm.
Preferably, the width of the square groove is between 0.9mm-3.9mm.
Preferably, the length of the square groove is between 8.2mm-11.2mm.
Preferably, between 65mm-85mm, width is between 15mm- for the length of the top dielectric plate or layer dielectric plate
30mm。
From the above-mentioned description of this invention, compared with prior art, the present invention has the advantages that：
1st, label antenna of the invention, eliminates shorting pin or short-circuit through hole, reduces difficulty of processing, there is stable
Working condition, and the label chip of various different impedances can be matched, with size is little, wide bandwidth and identification distance it is remote etc. excellent
Point.
2nd, label antenna of the invention, total optimization size is 75mm × 20mm × 3mm (length × width x thickness), and emulation is maximum
Gain 3.3dBi, S11 can be maintained at below -10dB in the broadband of 795MHz-992MHZ, reach with label chip good common
Yoke is matched, and relative bandwidth has reached 197MHz.
3rd, label antenna of the invention, the actual measurement identification distance in 915MH has reached 5.8 meters, it is sufficient to meet anti-metal
The use requirement of label antenna, and it is suitable for the use scene higher with to recognizing stability requirement.
Description of the drawings
Fig. 1 is the front view of the present invention；
Fig. 2 is the side view of the present invention；
Fig. 3 is the mark schematic diagram of the present invention；
Fig. 4 is the equivalent circuit diagram of the present invention；
Fig. 5 is the impact for coupling gap width Wf to antenna feed impedance real part；
Fig. 6 is the impact for coupling gap width Wf to antenna feed impedance imaginary part；
Fig. 7 is the impact for coupling gap width Wf to antenna reflection coefficient S11；
Fig. 8 is impacts of the square slot length Lk to antenna feed impedance real part；
Fig. 9 is impacts of the square slot length Lk to antenna feed impedance imaginary part；
Figure 10 is impacts of the square slot length Lk to antenna reflection coefficient S11；
Figure 11 is impacts of the square slot length Wk to antenna feed impedance real part；
Figure 12 is impacts of the square slot length Wk to antenna feed impedance imaginary part；
Figure 13 is impacts of the square slot length Wk to antenna reflection coefficient S11；
Figure 14 is label antenna 2D directional diagrams；
Figure 15 is label antenna 3D directional diagrams；
Figure 16 is the input impedance real part of label antenna actual measurement；
Figure 17 is the input impedance imaginary part of label antenna actual measurement；
Wherein：10th, top dielectric plate, 20, layer dielectric plate, 21, coupling gap, 30, label chip, 40, class dipole
Antenna, 41, central channel, the 42, first square groove, the 43, second square groove, 50, metal patch.
Specific embodiment
Below by way of specific embodiment, the invention will be further described.
Referring to figs. 1 to Fig. 3, a kind of double-decker broadband UHF RFID anti-metal tag antennas, including top dielectric plate
10th, layer dielectric plate 20 and label chip 30.The top dielectric plate 10 adopts dielectric constant for 4.4, and tangent loss angle is 0.02
Epoxy glass fiber plate (FR4), between 1mm-2mm, its upper surface is printed with class dipole antenna 40 to thickness h 1.The lower floor is situated between
Scutum 20 adopts dielectric constant for 3.55, and tangent loss angle is 0.002 polyfluortetraethylene plate, and thickness h 2 is between 2mm-4mm.On
, between 65mm-85mm, width is between 15mm-30mm for the length of layer dielectric-slab 10 and layer dielectric plate 20.The layer dielectric plate 20
Upper surface, lower surface and both sides be enclosed with metal patch 50, and the metal patch 50 of upper surface offers the coupling of rectangle
Gap 21, couples the width Wf in gap 21 between 2.5mm-4mm.The metal patch 50, coupling gap 21 constitute coupled resonator,
And metal patch is Copper Foil.The label chip 30 be located at top dielectric plate 10 upper surface opposing coupler gap 21 at and with class idol
Pole sub-antenna 40 is connected, and such dipole antenna 40 and coupled resonator produce resonance by coupling gap 21, so as to activate mark
Sign chip 30.Activation chip, exactly receives the energy of electromagnetic wave by class dipole antenna 40, activates resonance circuit, so as to
Label chip 30 is set to have enough energy work.The label chip 30 of the present invention is outstanding using U.S.'s English frequency relatively conventional on market
(Impinj) there is the M4QT chips of company's production, the chip -19.5dBm to read sensitivity.Resistance of the chip in 915MHz
Anti- value is Zc=11-j143 Ω.
Such dipole antenna 40 is provided with central channel 41 and four square grooves.Longitudinally through such dipole of the central channel 41
The middle part of antenna 40, label chip 30 is arranged in the central channel 41.These square grooves are to be longitudinally arranged and positioned at the central channel 41
Both sides, the square groove quantity of both sides is identical and parallel to each other.Specifically：The square groove includes two along class dipole antenna 40
The first square groove 42 that upper end extends downwardly, wherein one first square groove 42 is located at the left side of class dipole antenna 40 away from central channel
41 positions, another first square groove 42 is located at the right side of class dipole antenna 40 near the position of central channel 41.The square groove also includes
Two have second square groove 43 upwardly extending along the lower end of class dipole antenna 40, wherein one second square groove 43 is located at class dipole
Near the position of central channel 41, another first square groove 42 is located at the right side of class dipole antenna 40 away from central channel 41 to the left side of antenna 40
Position.And the first square groove 42 and second party of the distance between first square groove 42 and the second square groove 43 in left side with right side
The distance between shape groove 43 is identical.In addition, the first square groove 42 is identical with the size of the second square groove 43, its width Wk between
0.9mm-3.9mm, length Lk is between 8.2mm-11.2mm.The quantity of square groove of the present invention is not unique, can be six, four or
Other even numbers, only need to guarantee that the input impedance of antenna can reach good conjugate impedance match in label chip.
The optimal size of inventive antenna such as following table：
Table 1 (unit mm)
| W | L | h1 | h2 | Wf | W1 | L1 | W2 | L2 | Wk | Lk | dk |
| 20 | 75 | 1 | 2 | 2.5 | 5.5 | 9.5 | 13 | 25 | 1.9 | 10.2 | 8.6 |
By adjust lower floor coupling gap 21 width Wf and upper class dipole antenna 40 square slot length Lk and
Width Wk, can effectively adjust resonant frequency and the impedance of antenna, so that antenna reaches well altogether with label chip 30
Yoke is matched.The equivalent circuit diagram of label antenna of the present invention is as shown in Figure 3.
For the accuracy and reliability of quick accurately checking design, using finite element emulation software Ansoft HFSS
Model foundation and simulation optimization are carried out to antenna.It is having for 200mm*200mm that the antenna of the present invention is placed directly within into a size
Impact of the metal environment to label antenna is simulated on limit metal floor.Fig. 5, Fig. 6 and Fig. 7 sets forth coupling gap 21
Impacts of the width Wf to antenna feed impedance and S11.As seen from Figure 3, with the continuous increasing of the coupling width Wf of gap 21
Greatly, the real part and imaginary part of the input impedance of antenna can reduce therewith, i.e., the resonant frequency of antenna can be with the increase of Wf to high frequency
It is mobile.The square slot length Lk and width Wk of class dipole antenna 40 produces impact to antenna feed impedance and S11.By Fig. 8-10
With Figure 11-13 as can be seen that with the square slot length Lk of class dipole antenna 40 and being continuously increased for width Wk, antenna it is defeated
Entering the real part and imaginary part of impedance can increase therewith, i.e., the resonant frequency of antenna can be moved with the increase of Lk and Wk to low frequency.When
When the coupling width Wf=2.5mm of gap 21, square slot length Lk=10.2mm, the width Wk=1.9mm of class dipole antenna 40,
The input impedance of label antenna is 3.48+j143.59, and label antenna of the present invention reaches good conjugation with label chip 30
Match somebody with somebody, now reflectance factor S11=-31.6dB.The S11 of now designed label antenna<- 10dB bandwidth has reached 197MHz,
Can effective all standing UHF working frequency range, realize good service behaviour.
The reading distance of label antenna is most important performance indications, and according to Friis formula calculating label day can be drawn
Lineation opinion reads the formula (1) of distance.
Wherein PEIRPFor equivalent omnidirectional's transmit power of reader antenna, PthFor the minimum startup power of label chip 30
(can find from chip product specification), is the Polarization match factor between label antenna and reader antenna, GtagFor label
The actual gain of antenna, is represented by Gtag=Gt, wherein GtIt is between label antenna and chip for the reading gain of label antenna
Power transmission factor.If the impedance of label chip 30 is Zc=Rc+jXc, the impedance of label antenna is Zt=Rt+jXt, then can table
It is shown as
Due to the requirement of recognition efficiency, the reader antenna of circular polarisation can be typically adopted, so in label antenna and reading
There is the polarization mismatch of a 3dB between device antenna.
Gain and theoretical identification distance of the label antenna of table 2 in each frequency
Table 2 illustrates gain of the label antenna at the RFID frequency ranges that country variant is used and theoretical identification distance.
During centre frequency 915MHz, identification distance has reached 6.24 meters, and actual operation requirements are met enough.Figure 14 and Figure 15 are given respectively
Label antenna 915MH when 2D directional diagrams and 3D directional diagrams, it can be seen that directional diagram has very wide lobe width
Degree, it means that label antenna can realize the identification of wide-angle, there is good recognition success rate and recognition rate.
Using the dual-port vector analysis instrument measurement method based on S parameter, using vector network analyzer label day is measured
The S parameter of line, then calculates the input impedance (Z0=50) of label antenna, the actual measurement impedance of label antenna according to formula (3)
As shown in Figure 10.
Test equipment adopts frequency hopping working method, using the circular polarized antenna that gain is 7dBi as duplexer,
Test equipment power output is set to 26dBm, i.e. radiant power for 33dBm (3.2W EIRP).Can be calculated according to formula (1)
The ideally identification distance of label antenna, the actual measurement identification distance of label antenna is as shown in table 3.The self-control used during test
Testing tool is spliced altogether using two and half firm coaxial feeders, and the resistance of coaxial feeder is 50, and the design of antenna is not
It is to be based on 50 matching, therefore larger loss can be produced.Also due to uncertainties such as machining accuracy and test environments, cause
The reading distance of actual test and theoretical maximum read distance and there is certain deviation.But current test result, the knowledge of label antenna
Other distance meets routine use demand, and is better than traditional anti-metal tag antenna.Table 3 is label antenna actual measurement identification distance.
Table 3
The specific embodiment of the present invention is above are only, but the design concept of the present invention is not limited thereto, it is all to utilize this
Design carries out the change of unsubstantiality to the present invention, all should belong to the behavior for invading the scope of the present invention.
Claims (10)
1. a kind of double-decker broadband UHF RFID anti-metal tag antennas, including top dielectric plate, layer dielectric plate and mark
Sign chip；The top dielectric plate upper surface is printed with class dipole antenna；The upper surface of the layer dielectric plate, lower surface and both sides
Metal patch is enclosed with, and the metal patch of upper surface offers the coupling gap of rectangle；The label chip is located at top dielectric
It is connected at the opposing coupler gap of plate upper surface and with class dipole antenna；It is characterized in that：During such dipole antenna is provided with
Heart groove and even number square groove；Longitudinally through such dipole antenna middle part of the central channel is accommodating the label chip；This is square
Groove is to be longitudinally arranged and positioned at the both sides of the central channel.
2. a kind of double-decker broadband UHF RFID anti-metal tag antennas as claimed in claim 1, it is characterised in that：Institute
State square groove and include the first square groove extended downwardly along the class dipole antenna upper end, the central channel both sides are equipped with
At least 1 first square groove.
3. a kind of double-decker broadband UHF RFID anti-metal tag antennas as claimed in claim 1, it is characterised in that：Institute
State square groove and include the second square groove upwardly extending along the class dipole antenna lower end, the central channel both sides are equipped with
At least 1 second square groove.
4. a kind of double-decker broadband UHF RFID anti-metal tag antennas as claimed in claim 1, it is characterised in that：Institute
The square groove quantity for stating central channel both sides is identical and parallel to each other.
5. a kind of double-decker broadband UHF RFID anti-metal tag antennas as claimed in claim 1, it is characterised in that：Institute
State top dielectric plate and adopt dielectric constant for 4.4, tangent loss angle is 0.02 epoxy glass fiber plate, and thickness is between 1mm-
2mm。
6. a kind of double-decker broadband UHF RFID anti-metal tag antennas as claimed in claim 1, it is characterised in that：Institute
The width in coupling gap is stated between 2.5mm-4mm.
7. a kind of double-decker broadband UHF RFID anti-metal tag antennas as claimed in claim 1, it is characterised in that：Institute
State layer dielectric plate and adopt dielectric constant for 3.55, tangent loss angle is 0.002 polyfluortetraethylene plate, and thickness is between 2mm-
4mm。
8. a kind of double-decker broadband UHF RFID anti-metal tag antennas as claimed in claim 1, it is characterised in that：Institute
The width of square groove is stated between 0.9mm-3.9mm.
9. a kind of double-decker broadband UHF RFID anti-metal tag antennas as claimed in claim 1, it is characterised in that：Institute
The length of square groove is stated between 8.2mm-11.2mm.
10. a kind of double-decker broadband UHF RFID anti-metal tag antennas as claimed in claim 1, it is characterised in that：
, between 65mm-85mm, width is between 15mm-30mm for the length of the top dielectric plate or layer dielectric plate.
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| CN201611243824.7A CN106654524A (en) | 2016-12-29 | 2016-12-29 | Double-layer structured broadband UHF RFID anti-metal tag antenna |
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| CN201611243824.7A CN106654524A (en) | 2016-12-29 | 2016-12-29 | Double-layer structured broadband UHF RFID anti-metal tag antenna |
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Cited By (5)
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| CN107275750A (en) * | 2017-05-11 | 2017-10-20 | 电子科技大学 | A kind of remote anti-metal tag antenna sensor |
| CN107994324A (en) * | 2017-11-29 | 2018-05-04 | 哈尔滨工程大学 | Miniature antenna applied to 5G mobile communication |
| CN110796227A (en) * | 2019-10-29 | 2020-02-14 | 北京计算机技术及应用研究所 | Flexible anti-metal RFID passive tag with gap structure |
| CN112701449A (en) * | 2020-12-28 | 2021-04-23 | 成都科灵智能光电科技有限公司 | Ultrahigh frequency high-gain double dipole tag antenna with low profile |
| CN114118332A (en) * | 2021-11-26 | 2022-03-01 | 成都科灵智能光电科技有限公司 | Anti-metal radio frequency identification tag with reactance super-surface |
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| CN107275750A (en) * | 2017-05-11 | 2017-10-20 | 电子科技大学 | A kind of remote anti-metal tag antenna sensor |
| CN107275750B (en) * | 2017-05-11 | 2020-01-17 | 电子科技大学 | Long-distance anti-metal tag antenna sensor and defect detection method |
| CN107994324A (en) * | 2017-11-29 | 2018-05-04 | 哈尔滨工程大学 | Miniature antenna applied to 5G mobile communication |
| CN110796227A (en) * | 2019-10-29 | 2020-02-14 | 北京计算机技术及应用研究所 | Flexible anti-metal RFID passive tag with gap structure |
| CN110796227B (en) * | 2019-10-29 | 2024-01-30 | 北京计算机技术及应用研究所 | Flexible anti-metal RFID passive tag with gap structure |
| CN112701449A (en) * | 2020-12-28 | 2021-04-23 | 成都科灵智能光电科技有限公司 | Ultrahigh frequency high-gain double dipole tag antenna with low profile |
| CN114118332A (en) * | 2021-11-26 | 2022-03-01 | 成都科灵智能光电科技有限公司 | Anti-metal radio frequency identification tag with reactance super-surface |
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