CN101355195A - UHF RF dual-frequency-recognizing metal-resistance label antenna - Google Patents
UHF RF dual-frequency-recognizing metal-resistance label antenna Download PDFInfo
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- CN101355195A CN101355195A CNA2008101204617A CN200810120461A CN101355195A CN 101355195 A CN101355195 A CN 101355195A CN A2008101204617 A CNA2008101204617 A CN A2008101204617A CN 200810120461 A CN200810120461 A CN 200810120461A CN 101355195 A CN101355195 A CN 101355195A
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Abstract
The invention discloses a double-frequency band anti-metal ultrahigh frequency radio frequency identification tag antenna, comprising a metal ground surface, a metal radiation surface, a substrate, a rectangular groove, a first feeder line, a second feeder line, a via hole, a radio frequency identification chip and U-shaped apertures, wherein the substrate is rectangular, the metal radiation surface is positioned on the surface of the substrate, the metal ground surface is positioned on the lower surface of the substrate, one side of the metal radiation surface close to the short side is embedded with the rectangular groove, the middle part of the rectangular groove is provided with the first feeder line and the second feeder line, the radio frequency identification chip is arranged between one end of the first feeder line and one end of the second feeder line, the other end of the first feeder line is connected with the metal radiation surface, the second feeder line is provided with the via hole, the upper end of the via hole is connected with the second feeder line, the lower end of the via hole is connected with the metal ground surface, and two sides of the metal radiation surface close to the long side are embedded with a pair of the U-shaped apertures. The radio frequency identification anti-metal tag of the antenna can cover the two frequency bands of the ultra-high frequency radio frequency identification in China or two frequency bands of the ultra-high frequency radio frequency identification in North America and Europe.
Description
Technical field
The present invention relates to the anti-metal super high frequency radio frequency identification label of a kind of double frequency-band antenna.
Background technology
Radio frequency identification (Radio frequency identification is called for short RFID) is a kind of contactless automatic identification technology that utilizes radio frequency to realize.Rfid system generally is made up of reader and label, and reader is by the information on the less radio-frequency reading tag.Compare with conventional barcode, it has the distance of reading, reading speed is fast, does not fear spot, advantage such as can read while write, and has wide application space in various fields such as logistics supply chain, the production automation, traffic administration and security protections.Rfid system operates mainly in low frequency (LF), high frequency (HF), hyperfrequency (UHF) and microwave frequency ranges such as (MW).Low frequency and high frequency rfid system mainly utilize inductance coupling high to finish recognition function, read close together.Hyperfrequency and microwave frequency band rfid system come reading of data by electromagnetic wave propagation, have the distance that reads far away.Wherein, hyperfrequency is particularly suitable for remote passive RFID system and uses because its frequency is moderate.In view of the great potential that ultrahigh frequency RFID is used, various countries have issued the frequency range and the standard of ultrahigh frequency RFID in succession.The frequency range that international standard ISO/IEC 18000-6 recommends uhf band RFID equipment to use is 860MHz～960MHz.The frequency that use its Middle and North America is 902MHz-928MHz, and the frequency that use in Europe is 865MHz-868MHz.China has also issued the ultrahigh frequency RFID application specifies in April, 2007 by the Ministry of Information Industry, and radio-frequency (RF) index such as the operating frequency of Chinese ultrahigh frequency RFID wireless transmitting device, transmitting power, occupied bandwidth have been made detailed regulation.Middle Inter Milan usefulness 840MHz～845MHz and two frequency ranges of 920MHz～925MHz are as the operating frequency of ultrahigh frequency RFID, operating power is 2 W ERP (Effective Radiated Power), is about 3.3WEIRP (Effective Isotropic Radiated Power).
In quite a few RFID uses, the RFID label need be pasted on the metal surface, for example: automobile, steel cylinder, container or the like.But, when the hyperfrequency label, especially having the label of class dipole antenna, when being placed on the metal surface, the distance that reads of label can shorten rapidly, even can not be read.This is because the such boundary condition in metal surface can change radiation efficiency, impedance matching and the directional diagram of label antenna.For this reason, some label antennas that can be applied to the metal surface are devised, and are called anti-metal tag or metal label.Micro-strip paster antenna or planar inverted-F antenna can be with the metal surface as its floors, thereby are used for designing the RFID anti-metal tag antenna.Because the antenna impedance and the chip impedance of RFID label need conjugate impedance match, researchers have designed the various micro-strip paster antennas that can realize the impedance flexible.But the bandwidth of micro-strip paster antenna is often very limited, generally is at a certain single ultrahigh frequency RFID frequency range design.Though the anti-metal tag in some broadbands is also arranged, also can't cover two frequency bands of Chinese ultrahigh frequency RFID standard code or two frequency bands of North America and the identification of European super high frequency radio frequency simultaneously.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, the anti-metal super high frequency radio frequency identification label of a kind of double frequency-band antenna is provided.
It comprises metal ground, the metal radiating surface, substrate, rectangular recess, first feeder line, second feeder line, via hole, radio-frequency (RF) identification chip and U-shaped slot, substrate is a rectangle, the metal radiating surface is positioned at upper surface of base plate, metal ground is positioned at base lower surface, the metal radiating surface is embedded with rectangular recess near a side of minor face, be provided with first feeder line in the middle of the rectangular recess, second feeder line, be provided with radio-frequency (RF) identification chip between first feeder line, one end and second feeder line, one end, the first feeder line other end is connected with the metal radiating surface, second feeder line is provided with via hole, the via hole upper end is connected with second feeder line, the via hole lower end is connected with metal ground, and the metal radiating surface is embedded with the pair of U-shaped slot on the both sides near long limit.
Described metal radiating surface and rectangular recess, first feeder line, second feeder line, radio-frequency (RF) identification chip, U-shaped slot belong to the upper surface of substrate, and rectangular recess and U-shaped slot are formed by the etching of metal radiating surface.The U-shaped slot comprises the shoulder of a centre and is connected the arm at two ends, and the shoulder of U-shaped slot is parallel with the long limit of metal radiating surface, and the arm of U-shaped slot is parallel with the minor face of metal radiating surface, and arm and shoulder meet at right angles, and the opening of U-shaped slot is towards metal radiating surface inside.The long limit of rectangular recess is parallel with the long limit of metal radiating surface, and the axis of rectangular recess overlaps with the axis of metal radiating surface.First feeder line, second feeder line, via hole, radio-frequency (RF) identification chip are positioned on the axis of rectangular recess.Via hole runs through substrate, and the via hole inwall is the conducting metal wall, makes second feeder line be electrically connected with metal ground.
The radio frequency identification anti-metal tag that this antenna is made can cover two frequency bands of Chinese super high frequency radio frequency identification or two frequency bands of North America and the identification of European super high frequency radio frequency simultaneously.
Description of drawings
Fig. 1 is the anti-metal super high frequency radio frequency identification label of a double frequency-band antenna structure view;
Fig. 2 is the double frequency band aerial impedance schematic diagram that covers Chinese super high frequency radio frequency identification frequency range;
Fig. 3 is the double frequency band aerial reflection coefficient schematic diagram that covers Chinese super high frequency radio frequency identification frequency range;
Fig. 4 is the double frequency band aerial impedance schematic diagram that covers North America and European super high frequency radio frequency identification frequency range;
Fig. 5 is the double frequency band aerial reflection coefficient schematic diagram that covers North America and European super high frequency radio frequency identification frequency range;
Among the figure: metal ground 1, metal radiating surface 2, substrate 3, rectangular recess 4, first feeder line 5, second feeder line 6, via hole 7, radio-frequency (RF) identification chip 8, U-shaped slot 9.
Embodiment
The present invention can realize the frequency of two frequency bands and the flexible of impedance by the size of regulating antenna, thereby realizes the dual-band characteristic of anti-metal super high frequency radio frequency identification label antenna.
As shown in Figure 1, the anti-metal super high frequency radio frequency identification label of double frequency-band antenna comprises metal ground 1, metal radiating surface 2, substrate 3, rectangular recess 4, first feeder line 5, second feeder line 6, via hole 7, radio-frequency (RF) identification chip 8 and U-shaped slot 9, substrate 3 is a rectangle, metal radiating surface 2 is positioned at substrate 3 upper surfaces, metal ground 1 is positioned at substrate 3 lower surfaces, metal radiating surface 2 is embedded with rectangular recess 4 near a side of minor face, be provided with first feeder line 5 in the middle of the rectangular recess 4, second feeder line 6, be provided with radio-frequency (RF) identification chip 8 between first feeder line, 5 one ends and second feeder line, 6 one ends, first feeder line, 5 other ends are connected with metal radiating surface 2, second feeder line 6 is provided with via hole 7, via hole 7 upper ends are connected with second feeder line 6, via hole 7 lower ends are connected with metal ground 1, and metal radiating surface 2 is embedded with pair of U-shaped slot 9 on the both sides near long limit.
Described metal radiating surface 2 and rectangular recess 4, first feeder line 5, second feeder line 6, radio-frequency (RF) identification chip 8, U-shaped slot 9 belong to the upper surface of substrate 3, and rectangular recess 4 is formed by 2 etchings of metal radiating surface with U-shaped slot 9.U-shaped slot 9 comprises the shoulder of a centre and is connected the arm at two ends, the shoulder of U-shaped slot 9 is parallel with the long limit of metal radiating surface 2, the arm of U-shaped slot 9 is parallel with the minor face of metal radiating surface 2, and arm and shoulder meet at right angles, and the opening of U-shaped slot 9 is towards metal radiating surface 2 inside.The long limit of rectangular recess 4 is parallel with the long limit of metal radiating surface 2, and the axis of rectangular recess 4 overlaps with the axis of metal radiating surface 2.First feeder line 5, second feeder line 6, via hole 7, radio-frequency (RF) identification chip 8 are positioned on the axis of rectangular recess 4.Via hole 7 runs through substrate 3, and via hole 7 inwalls are the conducting metal wall, makes second feeder line 6 be electrically connected with metal ground 1.
For super high frequency radio frequency identification label, its chip generally is a complex impedance.In order to realize the ceiling capacity transmission of antenna and chip, then need the input impedance and the chip impedance conjugate impedance match of antenna, that is, real part equates, imaginary part is opposite.This just requires the real part of antenna feed impedance and imaginary part all to have the ability of regulating flexibly.
The frequency and the impedance of the anti-metal super high frequency radio frequency identification label of this double frequency-band antenna can be regulated by the dimensional parameters of antenna.The frequency that can regulate first frequency band by the length of regulating metal radiating surface 2.Can reduce the oscillation amplitude of the first frequency-band antenna impedance by the degree of depth that increases rectangular recess 4, and the length that increases part between the chip 8 of second feeder line 6 and the via hole 7 can increase the antenna impedance imaginary part, thereby realizes the conjugate impedance match of the impedance of the impedance of antenna and chip at first frequency band.The frequency that then can regulate second frequency band by the brachium of regulating the U-shaped slot 9 on the metal radiating surface 2.The oscillation amplitude that width by regulating U-shaped slot 9 and U-shaped slot 9 can be regulated the second frequency-band antenna impedance apart from the distance at metal radiating surface 2 edges, thus realize the conjugate impedance match of the impedance of the impedance of antenna and chip at second frequency band.
Embodiment 1
This programme is for covering the double frequency-band anti-metal tag antenna of Chinese super high frequency radio frequency identification frequency range.Substrate adopts the FR4 material, and relative dielectric constant is 4.4, and loss angle tangent is 0.02, and thickness is 2mm, and length of long sides is L, and length of short sides is 40mm.Metal ground and metal radiating surface all are metallic copper.The width of the rectangular recess of metal radiating surface minor face is 10mm, and the degree of depth of groove is L
InsetThe width that connects first feeder line of metal radiating surface and chip is 3mm, and length is 8mm.That radio-frequency (RF) identification chip is selected for use is the RI-UHF-STRAP-08 of TI company, and the impedance of 915MHz is about 13-j60 Ω.The width of second feeder line is 3mm, and length is L
Inset-10mm, the partial-length that second feeder line connects via hole and chip is L
sThe diameter of via hole is 2mm, and inwall is a metallic copper.The brachium of U-shaped slot is L
Arm, the width of U-shaped slot is d
w, be d apart from the distance on the limit of metal radiating surface 2
e
In order to make label be operated in two the frequency range 840MHz～845MHz and the 920MHz～925MHz of the identification of Chinese super high frequency radio frequency, need label antenna and chip all to have good impedance matching at these two frequency bands, that is, and conjugate impedance match.By reasonable adjusting antenna size parameter L, L
Inset, L
s, L
Arm, d
eAnd d
w, can be so that antenna be realized impedance matching at two frequency band places of 840MHz～845MHz and 920MHz～925MHz, thus realize dual-band characteristic.For the ease of the impedance matching of antenna, adopt finite element electromagnetic-field simulation method to come this antenna is carried out emulation and optimization.
By regulating the length L of metal radiating surface, the frequency that promptly can regulate first frequency band is near 840MHz～845MHz frequency band.And the impedance matching at the first frequency band place can be by regulating L
InsetAnd L
sRealize.By increasing L
Inset, can effectively reduce the oscillation amplitude of the first frequency band place impedance.And increase L
s, can increase the antenna impedance imaginary values.Therefore, in order to realize the conjugate of chip impedance, can be earlier by increasing L
InsetReducing antenna impedance, mainly is the real part that reduces antenna impedance, again by increasing L
sTo raise the imaginary part of antenna impedance.When first frequency band carried out impedance adjustment, the impedance real part of second frequency band was unaffected substantially.
For second frequency band, by regulating the brachium L of U-shaped slot
ArmChange the resonance frequency of second frequency band.Along with L
ArmIncrease, the frequency of second frequency band is close to the frequency of first frequency band.And the width d of adjusting U-shaped slot
wWith from the radiating surface edge apart from d
e, then can change the impedance oscillation amplitude at the second frequency band place.Reduce d when simultaneously
wAnd d
eThe time, the oscillation amplitude of the second frequency band place impedance is also corresponding to be reduced.By regulating L
Arm, d
wAnd d
e, then can effectively realize of the impedance matching of second frequency band at 920MHz～925MHz frequency band.When second frequency band carried out impedance adjustment, the impedance of first frequency band was unaffected substantially.
Therefore, by changing L, L
Inset, L
s, L
Arm, d
e, d
wCan realize the flexible of two frequency bands and impedance.By the emulation and the optimization of Finite Element Method, finally adopt L=88.4mm, L
Inset=40mm, L
s=18mm, L
Arm=8.8mm, d
e=1mm, d
w=0.6mm.The impedance of antenna emulation and reflection coefficient are respectively as Fig. 2, shown in Figure 3 under this size, and antenna match meets the frequency requirement of Chinese super high frequency radio frequency identification standard at 840MHz～845MHz and two frequency bands of 920MHz～925MHz.
This programme is for covering the double frequency-band anti-metal tag antenna of North America and European super high frequency radio frequency identification frequency range.The frequency that use the North America is 902MHz-928MHz, and the frequency that use in Europe is 865MHz-868MHz.In order to make the anti-metal tag antenna of design can cover North America and European super high frequency radio frequency identification frequency range simultaneously, as long as regulate the frequency of first frequency band and second frequency band, make two frequency bands be operated in the frequency range of North America and the identification of European super high frequency radio frequency respectively.The frequency of first frequency band mainly is to be regulated by the length L of metal radiating surface, and the frequency of second frequency band is by the brachium L of U-shaped slot
ArmRegulate.Antenna impedance matching method is identical with embodiment 1.
Get L=86mm, L
Inset=38mm, L
s=17mm, L
Arm=9.5mm, d
e=1mm, d
w=0.6mm, other parameters are identical with embodiment 1, and the impedance of antenna emulation under this size and reflection coefficient are respectively as Fig. 4, shown in Figure 5.Antenna match meets the frequency requirement of Europe and North America super high frequency radio frequency identification standard at 865MHz～868MHz and two frequency bands of 902MHz～928MHz.
Such scheme is two kinds of embodiments of the present invention, multiple different application scheme can be arranged under feature according to the invention, but these application schemes needs only feature according to the invention, all should belong to the scope of the present invention.
Claims (6)
1. the anti-metal super high frequency radio frequency identification label of double frequency-band antenna, it is characterized in that comprising metal ground (1), metal radiating surface (2), substrate (3), rectangular recess (4), first feeder line (5), second feeder line (6), via hole (7), radio-frequency (RF) identification chip (8) and U-shaped slot (9), substrate (3) is a rectangle, metal radiating surface (2) is positioned at substrate (3) upper surface, metal ground (1) is positioned at substrate (3) lower surface, metal radiating surface (2) is embedded with rectangular recess (4) near a side of minor face, be provided with first feeder line (5) in the middle of the rectangular recess (4), second feeder line (6), be provided with radio-frequency (RF) identification chip (8) between first feeder line (5) one ends and second feeder line (6) one ends, first feeder line (5) other end is connected with metal radiating surface (2), second feeder line (6) is provided with via hole (7), via hole (7) upper end is connected with second feeder line (6), via hole (7) lower end is connected with metal ground (1), and metal radiating surface (2) is embedded with pair of U-shaped slot (9) on the both sides near long limit.
2. the anti-metal super high frequency radio frequency identification label of a kind of double frequency-band according to claim 1 antenna, it is characterized in that described metal radiating surface (2) and rectangular recess (4), first feeder line (5), second feeder line (6), radio-frequency (RF) identification chip (8), U-shaped slot (9) belong to the upper surface of substrate (3), rectangular recess (4) is formed by metal radiating surface (2) etching with U-shaped slot (9).
3. the anti-metal super high frequency radio frequency identification label of a kind of double frequency-band according to claim 1 antenna, it is characterized in that described U-shaped slot (9) comprises the shoulder of a centre and is connected the arm at two ends, the shoulder of U-shaped slot (9) is parallel with the long limit of metal radiating surface (2), the arm of U-shaped slot (9) is parallel with the minor face of metal radiating surface (2), arm and shoulder meet at right angles, and the opening of U-shaped slot (9) is towards metal radiating surface (2) inside.
4. the anti-metal super high frequency radio frequency identification label of a kind of double frequency-band according to claim 1 antenna, the long limit that it is characterized in that described rectangular recess (4) is parallel with the long limit of metal radiating surface (2), and the axis of rectangular recess (4) overlaps with the axis of metal radiating surface (2).
5. the anti-metal super high frequency radio frequency identification label of a kind of double frequency-band according to claim 1 antenna is characterized in that described first feeder line (5), second feeder line (6), via hole (7), radio-frequency (RF) identification chip (8) are positioned on the axis of rectangular recess (4).
6. the anti-metal super high frequency radio frequency identification label of a kind of double frequency-band according to claim 1 antenna, it is characterized in that described via hole (7) runs through substrate (3), via hole (7) inwall is the conducting metal wall, makes second feeder line (6) be electrically connected with metal ground (1).
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| CNA2008101204617A CN101355195A (en) | 2008-08-29 | 2008-08-29 | UHF RF dual-frequency-recognizing metal-resistance label antenna |
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|---|---|---|---|
| CNA2008101204617A CN101355195A (en) | 2008-08-29 | 2008-08-29 | UHF RF dual-frequency-recognizing metal-resistance label antenna |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102254213A (en) * | 2011-07-14 | 2011-11-23 | 上海复旦天臣新技术有限公司 | Double-frequency radio-frequency identification tag |
| CN102542326A (en) * | 2011-12-19 | 2012-07-04 | 君毅工业股份有限公司 | Manufacturing method and structure of long-distance radio frequency identification metal product |
| CN102683806A (en) * | 2011-03-14 | 2012-09-19 | 深圳光启高等理工研究院 | Small foldable metamaterial radio-frequency antenna |
| CN101533946B (en) * | 2009-04-23 | 2012-11-14 | 杭州杰竞科技有限公司 | Micro embedded UHF radio frequency identification anti-metal tag antenna |
| CN102810166A (en) * | 2011-06-24 | 2012-12-05 | 深圳光启高等理工研究院 | Reader-writer, electronic tag and radio frequency identification system |
| CN102819761A (en) * | 2011-06-09 | 2012-12-12 | 北京同方微电子有限公司 | Anti-tamper ultrahigh frequency metal-resistant electronic tag structure |
| CN102916249A (en) * | 2012-10-25 | 2013-02-06 | 深圳先进技术研究院 | Wideband radio frequency label antenna |
| CN101667678B (en) * | 2009-10-12 | 2013-06-12 | 嘉兴佳利电子股份有限公司 | Radio frequency identification antenna |
| CN103839100A (en) * | 2014-03-13 | 2014-06-04 | 湖南理工学院 | Double-frequency dual-purpose remote metal-resistant RFID passive tag |
| CN103956570A (en) * | 2014-04-28 | 2014-07-30 | 华南理工大学 | Low-profile metal-resistant broadband ultrahigh-frequency RFID tag antenna |
| CN105896042A (en) * | 2016-04-08 | 2016-08-24 | 东南大学 | Slot antenna of metal via hole stepped-impedance |
| CN107392288A (en) * | 2017-07-14 | 2017-11-24 | 国电南瑞科技股份有限公司 | A kind of omnidirectional's power equipment inspection RF tag |
| CN107768832A (en) * | 2016-08-22 | 2018-03-06 | 瑞章科技有限公司 | RFID label tag and RFID label antenna |
| CN107946759A (en) * | 2017-11-15 | 2018-04-20 | 北京工业大学 | A kind of array strain transducer based on microstrip antenna formula RFID tag |
| CN108306096A (en) * | 2017-01-12 | 2018-07-20 | 南宁富桂精密工业有限公司 | A kind of anti-metal tag antenna and the electronic labelling system comprising the antenna |
| CN110084350A (en) * | 2019-04-16 | 2019-08-02 | 上扬无线射频科技扬州有限公司 | A kind of double frequency flexible ultra-high-frequency RFID anti-metal tag |
| CN110224223A (en) * | 2018-03-02 | 2019-09-10 | 三星电机株式会社 | Antenna equipment |
| CN113937483A (en) * | 2021-10-14 | 2022-01-14 | 合肥工业大学 | Low-profile anti-metal tag antenna applied to ultrahigh frequency band |
| CN114665259A (en) * | 2022-04-15 | 2022-06-24 | 合肥工业大学 | Ultra-wideband tag antenna suitable for metal liquid cross-coupling environment |
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| CN101533946B (en) * | 2009-04-23 | 2012-11-14 | 杭州杰竞科技有限公司 | Micro embedded UHF radio frequency identification anti-metal tag antenna |
| CN101667678B (en) * | 2009-10-12 | 2013-06-12 | 嘉兴佳利电子股份有限公司 | Radio frequency identification antenna |
| CN102683806A (en) * | 2011-03-14 | 2012-09-19 | 深圳光启高等理工研究院 | Small foldable metamaterial radio-frequency antenna |
| CN102819761A (en) * | 2011-06-09 | 2012-12-12 | 北京同方微电子有限公司 | Anti-tamper ultrahigh frequency metal-resistant electronic tag structure |
| CN102810166A (en) * | 2011-06-24 | 2012-12-05 | 深圳光启高等理工研究院 | Reader-writer, electronic tag and radio frequency identification system |
| CN102254213A (en) * | 2011-07-14 | 2011-11-23 | 上海复旦天臣新技术有限公司 | Double-frequency radio-frequency identification tag |
| CN102254213B (en) * | 2011-07-14 | 2013-11-06 | 上海天臣防伪技术股份有限公司 | Double-frequency radio-frequency identification tag |
| CN102542326A (en) * | 2011-12-19 | 2012-07-04 | 君毅工业股份有限公司 | Manufacturing method and structure of long-distance radio frequency identification metal product |
| CN102542326B (en) * | 2011-12-19 | 2014-07-02 | 君毅工业股份有限公司 | Manufacturing method and structure of long-distance radio frequency identification metal product |
| CN102916249A (en) * | 2012-10-25 | 2013-02-06 | 深圳先进技术研究院 | Wideband radio frequency label antenna |
| CN103839100A (en) * | 2014-03-13 | 2014-06-04 | 湖南理工学院 | Double-frequency dual-purpose remote metal-resistant RFID passive tag |
| CN103956570A (en) * | 2014-04-28 | 2014-07-30 | 华南理工大学 | Low-profile metal-resistant broadband ultrahigh-frequency RFID tag antenna |
| CN105896042A (en) * | 2016-04-08 | 2016-08-24 | 东南大学 | Slot antenna of metal via hole stepped-impedance |
| CN107768832A (en) * | 2016-08-22 | 2018-03-06 | 瑞章科技有限公司 | RFID label tag and RFID label antenna |
| CN108306096A (en) * | 2017-01-12 | 2018-07-20 | 南宁富桂精密工业有限公司 | A kind of anti-metal tag antenna and the electronic labelling system comprising the antenna |
| CN107392288A (en) * | 2017-07-14 | 2017-11-24 | 国电南瑞科技股份有限公司 | A kind of omnidirectional's power equipment inspection RF tag |
| CN107946759A (en) * | 2017-11-15 | 2018-04-20 | 北京工业大学 | A kind of array strain transducer based on microstrip antenna formula RFID tag |
| CN110224223A (en) * | 2018-03-02 | 2019-09-10 | 三星电机株式会社 | Antenna equipment |
| CN110224223B (en) * | 2018-03-02 | 2021-09-24 | 三星电机株式会社 | Antenna device |
| US11233337B2 (en) | 2018-03-02 | 2022-01-25 | Samsung Electro-Mechanics Co., Ltd. | Antenna apparatus |
| CN110084350A (en) * | 2019-04-16 | 2019-08-02 | 上扬无线射频科技扬州有限公司 | A kind of double frequency flexible ultra-high-frequency RFID anti-metal tag |
| CN113937483A (en) * | 2021-10-14 | 2022-01-14 | 合肥工业大学 | Low-profile anti-metal tag antenna applied to ultrahigh frequency band |
| CN114665259A (en) * | 2022-04-15 | 2022-06-24 | 合肥工业大学 | Ultra-wideband tag antenna suitable for metal liquid cross-coupling environment |
| CN114665259B (en) * | 2022-04-15 | 2023-04-25 | 合肥工业大学 | Ultra-wideband tag antenna suitable for metal-liquid mutual coupling environment |
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Application publication date: 20090128 |