CN103530680A - Dual-frequency radio frequency identification tag and radio frequency identification system with same - Google Patents
Dual-frequency radio frequency identification tag and radio frequency identification system with same Download PDFInfo
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- CN103530680A CN103530680A CN201310422644.5A CN201310422644A CN103530680A CN 103530680 A CN103530680 A CN 103530680A CN 201310422644 A CN201310422644 A CN 201310422644A CN 103530680 A CN103530680 A CN 103530680A
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Abstract
The invention discloses a dual-frequency radio frequency identification tag and a radio frequency identification system with the same. The dual-frequency radio frequency identification tag comprises a substrate, a tag antenna and a tag chip, wherein the tag antenna and the tag chip are arranged on the substrate; the tag antenna is provided with a centerline, and comprises an HF (high-frequency) coil antenna and a UHF (ultrahigh-frequency) antenna; the UHF antenna is axisymmetrical about the centerline; the tag chip comprises an HF tag chip and a UHF tag chip, which are arranged on a feeding point; the HF coil antenna comprises a metal antenna coil and an antenna bridge; the UHF antenna comprises main radiation bodies and a microstrip feeder line; the inner end of the metal antenna coil is connected with the feeding point through the antenna bridge, and the outer end of the metal antenna coil is directly connected with the feeding point; the two ends of the microstrip feeder line are connected with the main radiation bodies. According to the dual-frequency radio frequency identification tag and the radio frequency identification system with the same, a UHF tag antenna and an HF tag antenna are integrated, so that the simultaneous application cost of UHF and HF tags is lowered, and the application efficiency is improved.
Description
Technical field
The invention belongs to radio-frequency (RF) identification (Radio Frequency Identification, RFID) technical field, the radio-frequency recognition system that relates to a kind of double frequency (comprising HF and uhf band) RFID tag and comprise this label.
Background technology
Radio-frequency (RF) identification (Radio Frequency Identification, RFID) technology has extensively been widely used in every field, for example, the fields such as sale of goods, transportation, production, waste management, postal tracking, aviation luggage management, vehicle toll management, traditional strip of paper shape code is because of shortcomings such as its storage capacity are little, can not rewrite, in identification field, it is slowly substituted by rfid system.
Rfid system normally comprises the RFID reader with antenna of a plurality of RFID labels, at least one and this RFID label communication and for controlling the calculation element of this RFID reader.Normally, RFID label is comprised of RFID label antenna and label chip; RFID reader comprises: for energy or information being provided to the transmitter of RFID label and for receiving identity and other information from RFID label; Calculation element is processed the information obtaining by RFID reader.The transmitter of RFID reader is via antenna output RF(Radio Frequency, radio frequency) signal, thus generating an electromagnetic field, this electromagnetic field makes RFID label return to the RF signal of carry information.
In RFID label, the radio wave signal that electromagnetism place produces is to be sent to label chip via its RFID label antenna, and the current signal of label chip is to be sent in space by RFID label antenna.RFID label is mainly divided into 4 frequency bands by frequency range, and its division and performance, application are as shown in table 1 below:
The performance of table 1 different frequency range rfid system
At present, each band RFID label overwhelming majority is one-segment application, and each is incompatible for the RFID label of low frequency, high frequency, ultrahigh frequency, microwave.In actual applications, label of a kind of frequency range.HF label, because it adopts near field coil coupling technique, provides higher level of security and larger information storage space; And UHF label has better reading/writing distance and speed.In some application scenario, need to use HF and UHF label simultaneously, use two independently HF and UHF labels simultaneously, not only formality is loaded down with trivial details, and cost is very high.If HF and UHF can be combined, be integrated into a label the inside and go, can greatly reduce application cost, raise the efficiency.
HF label adopts magnetic Field Coupling to carry out message exchange with rfid interrogator, and antenna substrate and surface metal are less on its impact; And UHF adopts form and the rfid interrogator of electromagnetic transmission to carry out message exchange, antenna substrate and surface metal have a strong impact on gain and the level of impedance match of UHF antenna, and then affect reading/writing distance and the performance performance of UHF label.Therefore, if HF antenna and UHF antenna are integrated on same matrix, HF antenna can produce great electromagnetic coupled to UHF antenna, and both are not easy to integrated.
In view of this, be necessary to propose a kind of Novel double-frequency section (HF and UHF) RFID label.
Summary of the invention
The object of the invention is to for the deficiencies in the prior art the radio-frequency recognition system that a kind of double frequency (comprising HF and uhf band) RFID tag is provided and comprises this label.
The invention provides that to solve the technical scheme that its technical matters adopts as follows:
, comprising matrix, label antenna and label chip, label antenna and label chip are all arranged on matrix; Described label antenna is provided with a center line, and comprises HF coil antenna and UHF antenna, and UHF antenna is symmetrical arranged about centerline axis; Described label chip comprises HF label chip and UHF label chip, and HF label chip and UHF label chip are all arranged on feeding point;
HF coil antenna comprises metal antenna coil, antenna gap bridge; UHF antenna comprises main radiator, microstrip feed line; Passed a bridge and be connected with feeding point by antenna in the inner of metal antenna coil, outer end is directly connected with feeding point; All into strips, the two ends of microstrip feed line are connected with main radiator for main radiator and microstrip feed line; The syndeton of main radiator and microstrip feed line is symmetrical about center line, and feeding point is arranged on main radiator or microstrip feed line, and coaxial with center line.
Described main radiator and microstrip feed line are vertical bar shape or curved crease line shape.
Described HF coil antenna and UHF antenna duplexer same antenna matrix, and the thickness range of matrix is 0.01mm～60mm.
The width of described HF coil antenna is 0.2mm～2.5mm, and the distance in HF coil antenna between every turn coil is within the scope of 0.2mm～2mm; The length of the outer coil of HF coil antenna is within the scope of 30mm～80mm, and width is within the scope of 15mm～50mm.
Described UHF antenna is arranged on the outside of HF coil antenna, and the main radiator bending in UHF antenna is U-shaped, the metal antenna coil of U-shaped opening in HF coil antenna; The width of the main radiator in described UHF antenna is within the scope of 0.2mm～15mm, and length is within the scope of 10mm～100mm; Distance between main radiator and HF coil antenna is within the scope of 0.5mm～20mm.
In described UHF antenna, the width of microstrip feed line is within the scope of 0.2mm～13mm, and length is within the scope of 0.5mm～15mm; Distance between microstrip feed line and feeding point is within the scope of 0.5mm～15mm; The angle of microstrip feed line bending is within the scope of 0 ゜～90 ゜.
Described microstrip feed line 21 flexible folding repeatedly, take vertical bar and U-shaped be the best.Described main radiator is flexible to be folded repeatedly, and it is best take U-shaped.
, comprise one or more double-frequency radio-frequency identification tags.
Beneficial effect of the present invention is as follows:
The present invention, by integrated UHF label antenna and HF label antenna, makes it can be applicable to uhf band and HF frequency range, reduces the cost that UHF and HF label are applied simultaneously, improves application efficiency.This RFID tag antenna structure is compact to design simultaneously, area is little, and the dirigibility of the shape by label antenna designs, and makes its adjustable setting property strong, applied range.
Accompanying drawing explanation
Fig. 1 is the structural representation of the RFID label that provides according to first embodiment of the invention.
Fig. 2 is the structural representation of the RFID label that provides according to second embodiment of the invention.
Fig. 3 is the structural representation of the RFID label that provides according to third embodiment of the invention.
Fig. 4 is the structural representation of the RFID label that provides according to fourth embodiment of the invention.
In figure, label 30, matrix 20, microstrip feed line 21, main radiator 22, label chip 23, feeding point 24, antenna gap bridge 25, metal antenna coil 26, center line 27.
Embodiment
What introduce below is some in a plurality of possibility embodiment of the present invention, aims to provide basic understanding of the present invention, is not intended to confirm key of the present invention or conclusive key element or limits claimed scope.Easily understand, according to technical scheme of the present invention, do not changing under connotation of the present invention other implementations that one of ordinary skill in the art can propose mutually to replace.Therefore, following embodiment and accompanying drawing are only the exemplary illustrations to technical scheme of the present invention, and should not be considered as of the present invention all or be considered as the restriction of technical solution of the present invention or restriction.
Embodiment 1
The structural representation of the RFID label providing according to first embodiment of the invention is provided.In this embodiment, the RFID label antenna (as black part sub-pattern in figure) that label 30 comprises matrix 20, label chip 23 and formed by metal.RFID label antenna is formed at (shape as shown in FIG.) on matrix 20 by method compositions such as printing, etchings, thereby forms flat plane antenna; Label chip 23 is arranged on feeding point 24 places of RFID label antenna.
RFID label antenna has center line 28, and UHF antenna is about center line 28 symmetries.For realizing more clearly, describe, as shown in Figure 1, the direction at center line 28 places is defined as to y direction, perpendicular to the direction of center line 28, be defined as x direction.
First the structure of the RFID label antenna shown in Fig. 1 is elaborated.
As shown in Figure 1, label antenna is provided with a center line 27, comprises HF coil antenna and UHF antenna, and UHF antenna is symmetrical about centerline axis; Label chip 23 comprises HF label chip and UHF label chip, and HF label chip and UHF label chip are all arranged on feeding point 24.HF coil antenna comprises metal antenna coil 26, antenna gap bridge 25; UHF antenna comprises main radiator 22, microstrip feed line 21.Passed a bridge and 25 be connected with feeding point 24 by antenna in the inner of metal antenna coil 26, outer end is directly connected with feeding point 24.The two ends of microstrip feed line 21 are connected with main radiator 22; Main radiator 22 is with the syndeton of microstrip feed line 21 about center line 27 symmetries, and feeding point 24 is arranged on microstrip feed line 21, and coaxial with center line 27.Main radiator 22 and microstrip feed line 21 all into strips, can fold bending, but its concrete shape are not limited by the embodiment of the present invention.
Between main radiator 22 and label chip 23, be provided with microstrip feed line 21, microstrip feed line 21 is about center line 28 symmetries, and the width of microstrip feed line arranges in 0.2mm to 13mm scope, to adjust the impedance of UHF antenna, realizes and UHF label chip conjugate impedance match.
In embodiment 2 (as shown in Figure 2), microstrip feed line 21 is bent into for twice after U-shaped and is connected with main radiator, and in this embodiment, main radiator 22 is near HF coil antenna, and microstrip feed line 21 is away from HF coil antenna.
In embodiment 3 (as shown in Figure 3), microstrip feed line 21 is vertical bar shape, is directly connected with main radiator.
Continue as shown in Figure 1, HF coil antenna is positioned at the inner side that UHF surrounds, and this HF coil antenna is passed a bridge and 25 is connected with the label chip at feeding point 24 places by antenna.
In HF coil antenna, the width of metal antenna coil 26 can arrange in 0.2mm to 2.5mm scope, and the number of turns can arrange between 4～15, and convenient and HF label chip is realized resonance.
As shown in Figure 1, UHF antenna is arranged on HF coil antenna compared with a side of minor face, and forms encirclement shape, and HF label chip and UHF label chip are all placed in same feeding point 24 places.
In embodiment 4 (as shown in Figure 4), UHF antenna is arranged on a side of HF coil antenna longer sides, and forms encirclement shape, and HF label chip and UHF label chip are all placed in same feeding point 24 places.
In actual applications, label chip 23 comprises HF label chip and UHF label chip.The impedance of UHF label chip can be expressed as (A '+B ' j) ohm, and wherein, " A ' " represents the real part of impedance, and " B ' " represents the imaginary part of impedance; The label antenna impedance of RFID label can be expressed as (A+Bj) ohm, and wherein, " A " represents the real part of impedance, and " B " represents the imaginary part of impedance.
For realizing UHF label antenna and the transmission of UHF label chip ceiling capacity, must realize the conjugate impedance match of the two impedance as far as possible, be also (A '+B ' j)=(A+Bj).Therefore, must make to realize capacitive between this RFID label antenna and this label chip and mate, be also that the real part of both impedances equates substantially (A '=A); Also must make to realize perception between the UHF label chip of this RFID label antenna and this chip 11 and mate, be also the imaginary part (B '=-B) substantially on the contrary of both impedances; When A '=A, B '=-B, realized impedance matching.
The capacitance of the loading of HF label chip is expressed as C farad; The inductance value of HF coil antenna is expressed as L henry.For realizing HF label, work in F=13.56MHz, must make following equation set up:
wherein, π is circular constant.
In the present invention, the impedance magnitude of UHF antenna by adjusting the length of main radiator 22 and/or width and/or shape, microstrip feed line 22 length and/or width are set, main radiator 22 regulates with distance area and/or the shape of HF coil antenna.
In the present invention, the resonance frequency of HF coil antenna and HF label chip completes by the distance of adjusting between the width of coil 26 and length, every turn coil.
In this embodiment, the length that main radiator 22 is set by adjusting realizes RFID UHF antenna mates substantially with the impedance between UHF label chip, for example, in 10mm to 100mm scope, regulate and main radiator 22 is set realizes, yet for example, in 0.2mm to 15mm scope, regulate the width that main radiator 22 is set to realize basic capacitive coupling, by regulating the shape facility size of feeder line 21 to realize RFID UHF label antenna, mate (being also substantially equal-B of B ') with the basic perception between this UHF label chip, for example, for example, by regulate the length (being set to 10mm) that feeder line 21 is set in 0.2mm to 13mm scope, thereby the spacing between main radiator 22 and feeding point is set, or by regulate the distance (such as being set to 6mm or 8mm) that main radiator 22 and HF aerial coil are set in 0.5mm to 20mm scope, also the combination in any or by above several modes realizes label antenna jointly mates with the basic perception between this label chip 30.
In this embodiment, by regulating the length of aerial coil or/and width is realized HF coil antenna and HF label chip at 13.56MHz place resonance, for example, the width that described HF aerial coil 26 is set in 0.2mm to 2.5mm scope is realized; Yet for example, the distance between every circle in described HF aerial coil 26 being set in 0.2mm to 2mm scope realizes; By regulating the number of turns of HF aerial coil to realize HF antenna and HF label chip resonance at 13.56MHz, for example, for example, at 4 to 15 circles (being set to 10 circles), realize.
It should be noted that, when adjusting arranges the length of main radiator 22 and microstrip feed line 21, the number of times of main radiator 22 and microstrip feed line 21 bendings can arrange respectively between 0 to 5; The angle of microstrip feed line bending can be at 0 ゜ (example as shown in Figure 3) to 90 ゜ (example as shown in Figure 1 and Figure 2).
Further, strong by label antenna design flexibility of the present invention in the situation that, the two-band characteristic of RFID label does not also rely on matrix 20, and for example, matrix 20 no longer needs to select RF4 material, and the thickness of matrix 20 does not need to be set to 0.25 λ yet
0, therefore, the cost of RFID label 10 can reduce greatly, and thickness also can reduce.In this embodiment, matrix 20 can alternative costs relatively high but FR4(epoxy glass fabric that radioresistance characteristic is good), the material such as tygon (polyethene) or polyester (polyester), also can the low materials such as foam of alternative costs.The integral thickness of RFID label antenna also can be arranged on (for example 0.8mm) in 0.01mm to 60mm scope.
Shape by the label antenna in embodiment illustrated in fig. 1 changes setting, can obtain the RFID label of following examples.
Embodiment 2
The structural representation of the RFID label providing according to second embodiment of the invention is provided.As shown in Figure 2, the RFID label antenna (as black part sub-pattern in figure) that RFID label 30 similarly comprises matrix 20, label chip 23 and formed by metal.Label antenna is provided with a center line 27, comprises HF coil antenna and UHF antenna, and UHF antenna is symmetrical about centerline axis; Label chip 23 comprises HF label chip and UHF label chip, and HF label chip and UHF label chip are all arranged on feeding point 24.HF coil antenna comprises metal antenna coil 26, antenna gap bridge 25; UHF antenna comprises main radiator 22, microstrip feed line 21.Passed a bridge and 25 be connected with feeding point 24 by antenna in the inner of metal antenna coil 26, outer end is directly connected with feeding point 24.The two ends of microstrip feed line 21 are connected with main radiator 22; Main radiator 22 is with the syndeton of microstrip feed line 21 about center line 27 symmetries, and feeding point 24 is arranged in main radiator 22, and coaxial with center line 27.Microstrip feed line 21 is away from HF coil antenna, and main radiator 22 is near HF coil antenna, and forms semi-surrounding structure.Label antenna than embodiment illustrated in fig. 11, its difference is mainly the difference of microstrip feed line, main radiator is whole near HF coil antenna.
Embodiment 3
The structural representation of the RFID label providing according to third embodiment of the invention is provided.As shown in Figure 3, the RFID label antenna (as black part sub-pattern in figure) that RFID label 30 similarly comprises matrix 20, label chip 23 and formed by metal.Label antenna is provided with a center line 27, comprises HF coil antenna and UHF antenna, and UHF antenna is symmetrical about centerline axis; Label chip 23 comprises HF label chip and UHF label chip, and HF label chip and UHF label chip are all arranged on feeding point 24.HF coil antenna comprises metal antenna coil 26, antenna gap bridge 25; UHF antenna comprises main radiator 22, microstrip feed line 21.Passed a bridge and 25 be connected with feeding point 24 by antenna in the inner of metal antenna coil 26, outer end is directly connected with feeding point 24.The two ends of microstrip feed line 21 are connected with main radiator 22; Main radiator 22 is with the syndeton of microstrip feed line 21 about center line 27 symmetries, and feeding point 24 is arranged on microstrip feed line 21, and coaxial with center line 27.Microstrip feed line 21 is near HF coil antenna, and main radiator 22 is away from HF coil antenna, and forms semi-surrounding structure.
Than label antenna embodiment illustrated in fig. 1, its difference mainly comprises the shape difference of microstrip feed line 21, and microstrip feed line 21 is vertical bar shape and is directly connected with main radiator.
Embodiment 4
The structural representation of the RFID label providing according to fourth embodiment of the invention is provided.As shown in Figure 4, the RFID label antenna (as black part sub-pattern in figure) that RFID label 30 similarly comprises matrix 20, label chip 23 and formed by metal.Label antenna is provided with a center line 27, comprises HF coil antenna and UHF antenna, and UHF antenna is symmetrical about centerline axis; Label chip 23 comprises HF label chip and UHF label chip, and HF label chip and UHF label chip are all arranged on feeding point 24.HF coil antenna comprises metal antenna coil 26, antenna gap bridge 25; UHF antenna comprises main radiator 22, microstrip feed line 21.Passed a bridge and 25 be connected with feeding point 24 by antenna in the inner of metal antenna coil 26, outer end is directly connected with feeding point 24.The two ends of microstrip feed line 21 are connected with main radiator 22; Main radiator 22 is with the syndeton of microstrip feed line 21 about center line 27 symmetries, and feeding point 24 is arranged on microstrip feed line 21, and coaxial with center line 27.Microstrip feed line 21 is near HF coil antenna, and main radiator 22 is away from HF coil antenna, and forms semi-surrounding structure.Label antenna than embodiment illustrated in fig. 11, its difference is mainly that UHF antenna is positioned at long side of HF coil antenna.
Above Fig. 2 is to describing no longer one by one with setting and the principle of work of the same section of RFID label embodiment illustrated in fig. 1 in RFID label embodiment illustrated in fig. 4, and similarly, the RFID label of Fig. 2 to Fig. 4 embodiment can be applied to uhf band and HF frequency range.
The present invention provides rfid system simultaneously, and it comprises the RFID label (30) described in a plurality of above embodiment, and this rfid system also comprises having the RFID reader of antenna and for controlling the calculation element of this RFID reader.The parts that RFID reader and calculation element can be realized completely for those skilled in the art, describe no longer one by one at this.
Above example has mainly illustrated RFID label of the present invention and rfid system thereof.Although only some of them embodiments of the present invention are described, those of ordinary skills should understand, and the present invention can be within not departing from its purport and scope implements with many other forms.Therefore, the example of showing and embodiment are regarded as illustrative and not restrictive, and in the situation that not departing from spirit of the present invention as defined in appended each claim and scope, the present invention may be contained various modifications and replacement.
Claims (7)
1. a double-frequency radio-frequency identification tag, comprises matrix, label antenna and label chip, and label antenna and label chip are all arranged on matrix; It is characterized in that: described label antenna is provided with a center line, and comprise HF coil antenna and UHF antenna, UHF antenna is symmetrical arranged about centerline axis; Described label chip comprises HF label chip and UHF label chip, and HF label chip and UHF label chip are all arranged on feeding point;
HF coil antenna comprises metal antenna coil, antenna gap bridge; UHF antenna comprises main radiator, microstrip feed line; Passed a bridge and be connected with feeding point by antenna in the inner of metal antenna coil, outer end is directly connected with feeding point; All into strips, the two ends of microstrip feed line are connected with main radiator for main radiator and microstrip feed line; The syndeton of main radiator and microstrip feed line is symmetrical about center line, and feeding point is arranged on main radiator or microstrip feed line, and coaxial with center line.
2. a kind of double-frequency radio-frequency identification tag as claimed in claim 1, is characterized in that described main radiator and microstrip feed line are vertical bar shape or curved crease line shape.
3. a kind of double-frequency radio-frequency identification tag as claimed in claim 1, it is characterized in that described HF coil antenna and UHF antenna duplexer same antenna matrix, and the thickness range of matrix is 0.01mm～60mm.
4. a kind of double-frequency radio-frequency identification tag as claimed in claim 1, is characterized in that the width of described HF coil antenna is 0.2mm～2.5mm, and the distance in HF coil antenna between every turn coil is within the scope of 0.2mm～2mm; The length of the outer coil of HF coil antenna is within the scope of 30mm～80mm, and width is within the scope of 15mm～50mm.
5. a kind of double-frequency radio-frequency identification tag as claimed in claim 1, is characterized in that described UHF antenna is arranged on the outside of HF coil antenna, and the main radiator bending in UHF antenna is U-shaped, the metal antenna coil of U-shaped opening in HF coil antenna; The width of the main radiator in described UHF antenna is within the scope of 0.2mm～15mm, and length is within the scope of 10mm～100mm; Distance between main radiator and HF coil antenna is within the scope of 0.5mm～20mm.
6. a kind of double-frequency radio-frequency identification tag as claimed in claim 1, is characterized in that the width of microstrip feed line in described UHF antenna is within the scope of 0.2mm～13mm, and length is within the scope of 0.5mm～15mm; Distance between microstrip feed line and feeding point is within the scope of 0.5mm～15mm; The angle of microstrip feed line bending is within the scope of 0 ゜～90 ゜.
7. a radio-frequency recognition system, is characterized in that comprising one or more double-frequency radio-frequency identification tags as claimed in claim 1.
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| CN201310422644.5A CN103530680B (en) | 2013-09-16 | 2013-09-16 | A kind of double-frequency radio-frequency identification tag and include the radio-frequency recognition system of this label |
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| CN201310422644.5A CN103530680B (en) | 2013-09-16 | 2013-09-16 | A kind of double-frequency radio-frequency identification tag and include the radio-frequency recognition system of this label |
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| CN103530680B CN103530680B (en) | 2016-08-17 |
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| CN105512718A (en) * | 2016-01-08 | 2016-04-20 | 上海海鼎无线射频系统有限公司 | Double-frequency RFID (Radio Frequency Identification) tag |
| CN107408219A (en) * | 2014-12-22 | 2017-11-28 | 艾利丹尼森零售信息服务公司 | RFID device with multifrequency antenna |
| CN107679612A (en) * | 2017-10-18 | 2018-02-09 | 江苏联恒物宇科技有限公司 | A kind of tamper double frequency RFID label tag and preparation method thereof |
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| JP2020503771A (en) * | 2016-12-29 | 2020-01-30 | エイヴェリー デニソン リテール インフォメーション サービシズ リミテッド ライアビリティ カンパニー | Dual-function strap for resonant elements and microwave antennas |
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| CN112909538A (en) * | 2021-01-13 | 2021-06-04 | 宁波大学 | High-frequency RFID reader-writer antenna |
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| CN105373826A (en) * | 2015-11-19 | 2016-03-02 | 上海仪电智能电子有限公司 | Dual-frequency intelligent label |
| CN105470627A (en) * | 2015-11-19 | 2016-04-06 | 上海仪电智能电子有限公司 | Double-frequency intelligent label antenna |
| CN105373826B (en) * | 2015-11-19 | 2019-02-19 | 上海仪电智能电子有限公司 | A kind of double frequency intelligent label |
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| CN105512718A (en) * | 2016-01-08 | 2016-04-20 | 上海海鼎无线射频系统有限公司 | Double-frequency RFID (Radio Frequency Identification) tag |
| JP2020503771A (en) * | 2016-12-29 | 2020-01-30 | エイヴェリー デニソン リテール インフォメーション サービシズ リミテッド ライアビリティ カンパニー | Dual-function strap for resonant elements and microwave antennas |
| US11488459B2 (en) | 2016-12-29 | 2022-11-01 | Avery Dennison Retail Information Services, Llc | Dual function strap for resonating elements and ultra high frequency antennas |
| US11704985B2 (en) | 2016-12-29 | 2023-07-18 | Avery Dennison Retail Information Services Llc | Dual function strap for resonating elements and ultra high frequency antennas |
| CN107679612A (en) * | 2017-10-18 | 2018-02-09 | 江苏联恒物宇科技有限公司 | A kind of tamper double frequency RFID label tag and preparation method thereof |
| CN107819207A (en) * | 2017-12-04 | 2018-03-20 | 成都思悟革科技有限公司 | A kind of closely radiator |
| CN107819207B (en) * | 2017-12-04 | 2024-05-28 | 成都思悟革科技有限公司 | Short-distance radiator |
| CN108448227A (en) * | 2018-03-28 | 2018-08-24 | 武汉纺织大学 | A kind of reader antenna suitable for intensive counter |
| CN111860738A (en) * | 2020-07-17 | 2020-10-30 | 昆山华冠商标印刷有限公司 | Wireless radio frequency identification device |
| CN112909538A (en) * | 2021-01-13 | 2021-06-04 | 宁波大学 | High-frequency RFID reader-writer antenna |
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