CN103594795A - RFID label antenna - Google Patents
RFID label antenna Download PDFInfo
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- CN103594795A CN103594795A CN201310593629.7A CN201310593629A CN103594795A CN 103594795 A CN103594795 A CN 103594795A CN 201310593629 A CN201310593629 A CN 201310593629A CN 103594795 A CN103594795 A CN 103594795A
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- label
- label antenna
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Abstract
The embodiment of the invention provides an RFID label antenna with a metal-resisting characteristic. The RFID label antenna is characterized by comprising an artificial magnetic conductor structure floor, an antenna substrate and an antenna body, wherein the antenna body is attached above the antenna substrate, the antenna substrate is located above the artificial magnetic conductor structure floor, and a printed dipole mode is adopted for the antenna structure.
Description
Technical field
The present invention relates to a kind of wireless radio-frequency field, be specifically related to a kind of RFID label antenna.
Technical background
Rfid system has a clear superiority in stored prod information, and product information is stored in the electronic chip of RFID label, the identity of identification product that can be unique.RFID technology has obtained sizable occupation rate of market, and is widely used in and does not contact in paying.And Internet of things system is the interconnected developing direction of following article, RFID technology is the indispensable part of Internet of things system, in future ideality, each object of ours at one's side can be by the network interconnection, location, processes, and RFID technology is the basis of everything.
In the numerous application of RFID, there is RFID label in many situations will paste on metallic conductor surface, or near the good object of some conductivity.Container surface for example, surface of vehicle.And most of UHF(hyperfrequencies) the RFID label antenna of frequency range, when being positioned over the position of high conductivity material such as approaching metalloid, water, has obvious performance degradation.Existing uhf band RFID label in this case performance can be restricted.
Therefore, solution label antenna is positioned over metal surface affects this problem of tag performance, can improve greatly the range of application of RFID technology, the reliability of elevator system, the RFID label antenna that therefore research has an anti-metallicity just becomes a technology that is worth exploitation.
Summary of the invention
The embodiment of the present invention provides a kind of RFID label antenna, can be operated in metal object surface, or near the good object of some conductivity, has anti-metallic character.
The embodiment of the present invention provides a kind of RFID label antenna, comprise: artificial magnetic conductor structural flooring, antenna substrate and antenna, described antenna invests described antenna substrate top, described antenna substrate is positioned at described artificial magnetic conductor structural flooring top, and wherein said antenna structure adopts printed dipole form.
Wherein, described antenna is symmetrical printed, folded a period of time antenna.
Wherein, described symmetrical printed, folded a period of time antenna is gradual foldable structure, every section of folding vertical length in described printed, folded a period of time by mind-set both sides increase gradually.
Wherein, to take the folding times that mid line is ，Mei limit, boundary be 3 times to described symmetrical printed, folded a period of time antenna.
Wherein, described antenna end is loaded with large paster structure.
Wherein, in described antenna, include induction reactance component.
Wherein, described induction reactance component is: the impedance matching network of introducing at the chip feed place of described antenna.
Wherein, described induction reactance component is: the coupling ribbon structure adding in described antenna both sides.
Wherein, described artificial magnetic conductor structural flooring comprises 8 artificial magnetic conductor construction units.
Wherein, described artificial magnetic conductor structural flooring thickness is 8mm, and each artificial magnetic conductor construction unit is of a size of 21 * 21mm; Described antenna substrate relative dielectric constant is 4.4, and thickness is 1mm, is of a size of 50 * 40mm; Described in described antenna distance, the distance of artificial magnetic conductor structural flooring is 4mm.
A kind of RFID label antenna that the embodiment of the present invention provides, makes label antenna have anti-metallic character by increase artificial magnetic conductor structural flooring below antenna.
Accompanying drawing explanation
Figure 1 shows that the tag antenna structure schematic diagram that the embodiment of the present invention provides.
Figure 2 shows that the end view of the tag antenna structure that the embodiment of the present invention provides.
Figure 3 shows that the antenna pattern enlarged diagram that the embodiment of the present invention provides.
Figure 4 shows that the label antenna radiation direction schematic diagram that the embodiment of the present invention provides.
Figure 5 shows that the label antenna reflection coefficient exemplary plot that the embodiment of the present invention provides.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
Figure 1 shows that the tag antenna structure schematic diagram that the embodiment of the present invention provides.As shown in Figure 1, this label antenna comprises: artificial magnetic conductor (AMC) structural flooring 100, antenna substrate 200 and antenna 300, antenna 300 invests antenna substrate 200 tops, and antenna substrate 200 is positioned at artificial magnetic conductor structural flooring 100 tops, and antenna 100 structures adopt printed dipole form.By increase artificial magnetic conductor structural flooring below antenna, can effectively prevent the interference of metal pair radiofrequency signal, make this label antenna can be operated in metal object surface, or near the good object of some conductivity.
Antenna 300 is symmetrical printed, folded a period of time antenna, and wherein, this folded state is gradual foldable structure, more past centre, and its folding degree is higher, and each folding vertical length in printed, folded a period of time is reduced to center gradually by both sides.In an embodiment of the present invention, to take the folding times that mid line is ，Mei limit, boundary be 3 times to this symmetry printed, folded a period of time antenna.This method for folding adopts dipole antenna bending technology.By the bending to antenna, in same area, increased the effective length of antenna; Or in the situation that not reducing antenna efficiency, can reduce the size of antenna.
In addition, can also load large paster structure in antenna end, to increase the electric capacity of antenna, reduce the capacitive reactance of antenna, under identical antenna length, can effectively reduce resonance frequency, thereby improve the frequency bandwidth of antenna.Like this, same label antenna can be general under different frequency range standards, and without design iterations, greatly reduce manufacturing cost.
In RFID label, the impedance of the chip of main flow that jointly forms tag transponder with label antenna under UHF frequency generally has higher capacitive reactance, the Higgs3 chip that for example U.S.'s meaning connection science and technology (AlienTechnology) is produced, under 915MHz, chip impedance value is Z
c=16.6-j155 Ω.In order to realize label antenna and chip conjugate impedance match, need in antenna impedance, introduce a larger induction reactance component, thereby make antenna and chip conjugate impedance match.Can introduce impedance matching network, for example T-shaped matching network at the chip feed place of antenna.In an embodiment of the present invention, can also be by add the mode of the ribbon structure that is coupled in antenna both sides.
The end view of the tag antenna structure that shown in Fig. 2, the embodiment of the present invention provides.As shown in Figure 2, the distance of antenna distance artificial magnetic conductor structural flooring is 4mm, and antenna substrate thickness is 1mm, and the thickness of artificial magnetic conductor structural flooring is 8mm.
In a preferred embodiment of the present invention, whole artificial magnetic conductor structural flooring is of a size of 84 * 42mm, and whole artificial magnetic conductor structural flooring consists of 8 construction units, and each construction unit is of a size of 21 * 21mm.
Printed antenna overall dimensions is l * w=50 * 40mm, chooses relative dielectric constant ε
rbe 4.4 material as antenna substrate, the concrete dimensional parameters of antenna as shown in Figure 3, wherein illustrates each parameter value as follows: printed antenna structural entity length l=50mm, width w=40mm; Printed, folded a period of time first's live width d=1mm, second portion live width lc=4mm, folding a period of time wiring gap lb=1mm; Folding horizontal printing length la=5mm of a period of time, feed gap is p=4mm; The vertical length wa=20mm of syllogic printed, folded a period of time first paragraph, the vertical length wb=25mm of second segment, the 3rd section of vertical length wc=30mm; Printing coupling tape length l p=33mm, live width dp=1mm.
Figure 4 shows that the label antenna radiation direction schematic diagram that the embodiment of the present invention provides.In the main radiation direction of antenna, directivity factor is 2.17dBi as shown in Figure 4, and backward directivity factor is 0.77dBi, and front and back are than being 1.4dB.Meanwhile, load the anti-metal tag antenna of 8 unit artificial magnetic conductor structural floorings, gain can reach 2.18dB.The label antenna that the visible embodiment of the present invention provides can be operated in metal object surface or the more close good object of conductivity.
Figure 5 shows that the label antenna reflection coefficient exemplary plot that the embodiment of the present invention provides.As shown in Figure 5, antenna-10dB bandwidth is 812MHz-927MHz, and its centre frequency is 855MHz, and its absolute bandwidth is 115MHz, relative bandwidth 13.4%.As can be seen here, the label antenna that the embodiment of the present invention provides has good broadband character, can meet the requirement that covers China rfid system 840MHz-845MHz and two frequency bands of 920MHz-925MHz simultaneously.In addition, this label antenna is at the antenna impedance Z of center resonance frequency
a=6.1-j153.5 Ω, notch depth is-28.7dB that in the label antenna that the visible embodiment of the present invention provides, antenna mates well with chip.
The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, be equal to replacement etc., within all should being included in protection scope of the present invention.
Claims (10)
1. a RFID label antenna, it is characterized in that, comprising: artificial magnetic conductor structural flooring, antenna substrate and antenna, described antenna invests described antenna substrate top, described antenna substrate is positioned at described artificial magnetic conductor structural flooring top, and wherein said antenna structure adopts printed dipole form.
2. label antenna according to claim 1, is characterized in that, described antenna is symmetrical printed, folded a period of time antenna.
3. label antenna according to claim 2, is characterized in that, described symmetrical printed, folded a period of time antenna is gradual foldable structure, every section of folding vertical length in described printed, folded a period of time by mind-set both sides increase gradually.
4. label antenna according to claim 2, is characterized in that, it is 3 times that described symmetrical printed, folded a period of time antenna be take the folding times that mid line is ，Mei limit, boundary.
5. label antenna according to claim 1, is characterized in that, described antenna end is loaded with large paster structure.
6. label antenna according to claim 1, is characterized in that, includes induction reactance component in described antenna.
7. label antenna according to claim 6, is characterized in that, described induction reactance component is: the impedance matching network of introducing at the chip feed place of described antenna.
8. label antenna according to claim 6, is characterized in that, described induction reactance component is: the coupling ribbon structure adding in described antenna both sides.
9. label antenna according to claim 1, is characterized in that, described artificial magnetic conductor structural flooring comprises 8 artificial magnetic conductor construction units.
10. label antenna according to claim 9, is characterized in that, described artificial magnetic conductor structural flooring thickness is 8mm, and each artificial magnetic conductor construction unit is of a size of 21 * 21mm; Described antenna substrate relative dielectric constant is 4.4, and thickness is 1mm, is of a size of 50 * 40mm; Described in described antenna distance, the distance of artificial magnetic conductor structural flooring is 4mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310593629.7A CN103594795A (en) | 2013-11-21 | 2013-11-21 | RFID label antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310593629.7A CN103594795A (en) | 2013-11-21 | 2013-11-21 | RFID label antenna |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103594795A true CN103594795A (en) | 2014-02-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310593629.7A Pending CN103594795A (en) | 2013-11-21 | 2013-11-21 | RFID label antenna |
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| CN (1) | CN103594795A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104409839A (en) * | 2014-11-26 | 2015-03-11 | 佛山中元创新实业有限公司 | Sliver paste printed double-wideband antenna |
| CN104409832A (en) * | 2014-11-26 | 2015-03-11 | 佛山中元创新实业有限公司 | Planar folded dipole antenna |
| CN104733846A (en) * | 2015-03-24 | 2015-06-24 | 江苏物联网研究发展中心 | Small UHF meander-line dipole anti-metallic RFID label antenna |
| CN110729563A (en) * | 2019-10-14 | 2020-01-24 | Oppo（重庆）智能科技有限公司 | Antenna assembly and electronic equipment |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201117802Y (en) * | 2007-06-25 | 2008-09-17 | 上海坤锐电子科技有限公司 | Ultra- wide-band electronic label antenna |
| CN102147877A (en) * | 2011-03-29 | 2011-08-10 | 成都鼎格科技有限公司 | Electronic tag |
| CN102496776A (en) * | 2011-12-08 | 2012-06-13 | 南京大学 | Tag antenna capable of covering global UHF RFID frequency ranges, electronic tag |
-
2013
- 2013-11-21 CN CN201310593629.7A patent/CN103594795A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201117802Y (en) * | 2007-06-25 | 2008-09-17 | 上海坤锐电子科技有限公司 | Ultra- wide-band electronic label antenna |
| CN102147877A (en) * | 2011-03-29 | 2011-08-10 | 成都鼎格科技有限公司 | Electronic tag |
| CN102496776A (en) * | 2011-12-08 | 2012-06-13 | 南京大学 | Tag antenna capable of covering global UHF RFID frequency ranges, electronic tag |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104409839A (en) * | 2014-11-26 | 2015-03-11 | 佛山中元创新实业有限公司 | Sliver paste printed double-wideband antenna |
| CN104409832A (en) * | 2014-11-26 | 2015-03-11 | 佛山中元创新实业有限公司 | Planar folded dipole antenna |
| CN104409832B (en) * | 2014-11-26 | 2017-04-19 | 广东中元创新科技有限公司 | Planar folded dipole antenna |
| CN104409839B (en) * | 2014-11-26 | 2017-06-06 | 广东中元创新科技有限公司 | A kind of double all channel antennas of silver paste printing-type |
| CN104733846A (en) * | 2015-03-24 | 2015-06-24 | 江苏物联网研究发展中心 | Small UHF meander-line dipole anti-metallic RFID label antenna |
| CN110729563A (en) * | 2019-10-14 | 2020-01-24 | Oppo（重庆）智能科技有限公司 | Antenna assembly and electronic equipment |
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Application publication date: 20140219 |