CN103474747A - RFID (Radio Frequency Identification) anti-metal tag antenna - Google Patents
RFID (Radio Frequency Identification) anti-metal tag antenna Download PDFInfo
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- CN103474747A CN103474747A CN2013103843828A CN201310384382A CN103474747A CN 103474747 A CN103474747 A CN 103474747A CN 2013103843828 A CN2013103843828 A CN 2013103843828A CN 201310384382 A CN201310384382 A CN 201310384382A CN 103474747 A CN103474747 A CN 103474747A
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Abstract
The invention discloses an RFID (Radio Frequency Identification) anti-metal tag antenna. The RFID anti-metal tag antenna comprises a substrate as well as an IC (Integrated Circuit), two matching networks, two frequency regulation vibrators and two radiation vibrators, which are positioned on the substrate, wherein the two matching networks, the two frequency regulation vibrators and the two radiation vibrators are in axially symmetrical distribution by taking a straight line with the center line of the long sides of the substrate as an axis of symmetry, the IC is welded at the symmetrical center of the substrate and used for connecting the two matching networks, the other ends of the matching networks are connected with one ends of the frequency regulation vibrators, and the other ends of the frequency regulation vibrators are connected with the radiation vibrators. The RFID anti-metal tag antenna has strong coupling capability, and when the distance between the antenna and a metal surface labeled with a tag is increased, the original bandwidth of the antenna can not be reduced.
Description
Technical field
The invention belongs to wireless communication technology field, be specifically related to a kind of structural design of RFID anti-metal tag antenna.
Background technology
REID (RFID, Radio Frequency Identification) is a kind of emerging automatic identification technology, by wireless mode, carries out bidirectional data communication, and then target is identified.Typical rfid system is comprised of electronic tag, read write line and related software.Owing between RFID label and read write line, without physical contact, can completing identification, so rfid system can be operated in adverse circumstances, and realizes the identification to a plurality of moving targets.
In rfid system, read write line sends the radiofrequency signal of certain frequency by antenna, when label enters this zone, label obtains the read write line order from radiation field by label antenna, process through tag circuit, then send out the response message such as self coding by label antenna, after information is read by read write line and decodes, be sent to the processing of exchanges data administrating system, thereby reach the purpose of automatic recognition object.
As the elementary cell of rfid system, the performance of label antenna will directly affect the accuracy that receives and transmit.And the RFID based on electromagnetic wave transmission principle is in actual applications, there is the application scenario of considerable part all inevitably will come into contacts with metallic object, require its signal conduction can resist metal.
When label is close to metal surface, label antenna is parallel to the magnetic line of force that is distributed in metal surface fully, do not have angle to carry out magnetic force line cutting and obtain energy, can't be read, and start to occur the not magnetic line of force of the bending parallel with metal surface in the magnetic line of force away from metal surface, so cutting magnetic line movement can occur in the label antenna that is in one segment distance from metal surface, from carrying out data communication.Domestic anti-metal tag is generally improved on conventional dipole subtab antenna at present, reduce the impact of metallic reflection in the face of label antenna by the distance that increases label antenna and metal surface, realize the anti-metallicity of label antenna, but its shortcoming is to make the volume of whole label and the Bandwidth Reduction of cost increase and label antenna.
Summary of the invention
The object of the invention is to overcome the problems referred to above that prior art exists, providing a kind of can not affect the label antenna bandwidth when increasing label antenna and metal surface distance, and the small and exquisite RFID anti-metal tag antenna of volume.
For solving the problems of the technologies described above, the present invention by the following technical solutions:
A kind of RFID anti-metal tag antenna, comprise substrate and be positioned at the integrated circuit (IC on substrate, Integrated Circuit), two matching networks, two frequency adjustment oscillators and two radiating doublets, described two matching networks, two frequency adjustment oscillators, two radiating doublets be take the center line place straight line on the long limit of substrate and are distributed axisymmetricly as symmetry axis, described IC is welded in the symmetrical centre place of substrate and two matching networks is coupled together, the other end of described matching network connects an end of described frequency adjustment oscillator, the other end of described frequency adjustment oscillator connects radiating doublet.
Further, described matching network adopts the symmetrical coupled structure.
Further, described frequency adjustment oscillator adopts snakelike fold line structure.
Further, described radiating doublet is rectangular microband paste.
Further, described substrate is the glass-epoxy copper-clad plate.
Compared with prior art, the invention has the beneficial effects as follows:
(1) how existing anti-metal tag antenna improves the electromagnetic energy receiving ability by improving the methods such as isolation, increase antenna area, but simultaneously label metal surface to read effect weakened, RFID anti-metal tag antenna of the present invention adopts micro-area of widening radiating doublet with rectangular patch, in the situation that do not increase antenna area, do not adopt and improve the isolation measure, make anti-metal electronic tag be more prone to receive electromagnetic energy, and do not affect and read effect;
(2) traditional anti-metal tag volume is larger, and the impact position of reading, usually read zone and be difficult to fix, and RFID anti-metal tag antenna of the present invention adopts snakelike fold line design, reduces the anti-metal tag volume, and simple in structure, processing cost is low;
(3) RFID anti-metal tag antenna of the present invention adopts the glass-epoxy copper-clad plate, the glass-epoxy copper-clad plate, it is dielectric-slab the most common in Electronic Design, electric property is good, higher mechanical performance and dielectric property (lower than 5.0) are arranged, thermal endurance (150 degrees centigrade still can retention stable) and moisture resistivity preferably, and good machining property arranged, its various aspects of performance parameter all can meet label antenna require in situation, greatly reduce the cost of label antenna;
Therefore (4) because the radiating doublet area coverage is larger, antijamming capability is strong, even RFID anti-metal tag antenna of the present invention is encapsulated in its anti-metallicity in label box and does not also change.
The accompanying drawing explanation
The structural representation that Fig. 1 is RFID anti-metal tag antenna of the present invention.
Description of reference numerals: 1-substrate, 2-IC, 3,3 ＇-matching network, 4,4 ＇-frequency adjustment oscillator, 5,5 ＇-radiating doublet.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
As shown in Figure 1, RFID anti-metal tag antenna in the present embodiment comprises substrate 1 and is positioned at the IC2 on substrate 1, two matching networks 3 and 3 ＇, two frequency adjustment oscillators 4, 4 ＇ and two radiating doublets 5, 5 ＇, two matching networks 3 and 3 ＇, two frequency adjustment oscillators 4, 4 ＇ and two radiating doublets 5, 5 ＇ be take the center line place straight line on the long limit of substrate 1 and are distributed axisymmetricly as symmetry axis, IC2 is welded in the symmetrical centre place of substrate 1 and matching network 3 and 3 ＇ is coupled together, the other end rate of connections of matching network 3 is regulated an end of oscillator 4, the other end of frequency adjustment oscillator 4 connects radiating doublet 5, and the other end rate of connections of matching network 3 ＇ is regulated the end of oscillator 4 ＇, the other end of frequency adjustment oscillator 4 ＇ connects radiating doublet 5 ＇.
In order to regulate the input impedance of antenna, the matching network 3 in the present embodiment and 3 ＇ adopt the symmetrical coupled structure, and can reach by regulating its shape and spacing the effect of impedance matching.
During the close metal surface of label antenna, radiation resistance sharply reduces, cause efficiency sharply to reduce, and Folding structure can improve the radiation resistance of antenna greatly, when the close metal of antenna, radiation resistance is unlikely to drop to makes antenna failure, for this characteristic of Folding structure, the frequency adjustment oscillator 4 of the RFID anti-metal tag antenna in the present embodiment, 4 ＇ adopt snakelike fold line structure to be adjusted the centre frequency of antenna, the employing of this structure simultaneously effectively reduces the volume of antenna, and then effectively reduce the volume of RFID anti-metal tag, improved the stationarity that reads position.
How existing anti-metal tag antenna improves the electromagnetic energy receiving ability by improving the methods such as isolation, increase antenna area, but simultaneously label metal surface to read effect weakened, for in the situation that do not increase antenna area, do not adopt and improve the isolation measure, make anti-metal electronic tag be more prone to receive electromagnetic energy, and do not affect and read effect, radiating doublet 5,5 ＇ of the RFID anti-metal tag antenna in the present embodiment adopt rectangular microband paste.
For in the situation that meet the label antenna performance parameter and reduce costs to greatest extent, the substrate 1 in the present embodiment adopts the glass-epoxy copper-clad plate.
The manufacturing process of the RFID anti-metal tag antenna in the present embodiment is as follows:
Make successively rectangular microstrip radiating doublet 5,5 ＇, snakelike fold line frequency adjustment oscillator 4,4 ＇ being provided with on the glass-epoxy copper-clad base plate 1 of fixing hole 11, adjust spacing between symmetrical matching network 3 and 3 ＇ and width and arrive the symmetrical centre position that IC2 is welded on after optimum efficiency to substrate 1.
The performance parameter of the RFID anti-metal tag antenna in the present embodiment is as follows:
Centre frequency: 925MHz;
Gain: 0.5dBi;
VSWR：<2.0；
Input impedance: 50 ohm;
Bandwidth: 30MHz;
Polarization mode: linear polarization.
Although with reference to best interpretations embodiment of the present invention, invention has been described here, but, should be appreciated that, those skilled in the art can design a lot of other modification and execution modes, and these are revised and within execution mode will drop on the disclosed principle scope and spirit of the application.More particularly, in the scope of, accompanying drawing open in the application and claim, can carry out multiple modification and improvement to building block and/or the layout of subject combination layout.Except modification that building block and/or layout are carried out with improving, to those skilled in the art, other purposes will be also obvious.
Claims (5)
1. a RFID anti-metal tag antenna, it is characterized in that: comprise substrate (1) and be positioned at the integrated circuit (2) on substrate (1), two matching networks (3), (3 ＇), two frequency adjustment oscillators (4), (4 ＇) and two radiating doublets (5), (5 ＇), two matching networks (3), (3 ＇), two frequency adjustment oscillators (4), (4 ＇), two radiating doublets (5), (5 ＇) take the center line place straight line on the long limit of substrate (1) is that the symmetry axis axial symmetry distributes, integrated circuit (2) is welded in the symmetrical centre place of substrate (1) and matching network (3) and (3 ＇) is coupled together, the other end rate of connections of matching network (3) is regulated an end of oscillator (4), the other end of frequency adjustment oscillator (4) connects radiating doublet (5), the other end rate of connections of matching network (3 ＇) is regulated an end of oscillator (4 ＇), and the other end of frequency adjustment oscillator (4 ＇) connects radiating doublet (5 ＇).
2. RFID anti-metal tag antenna according to claim 1 is characterized in that: described matching network (3), (3 ＇) are the symmetrical coupled structure.
3. RFID anti-metal tag antenna according to claim 1 is characterized in that: described frequency adjustment oscillator (4), (4 ＇) are shaped as snakelike fold line.
4. RFID anti-metal tag antenna according to claim 1 is characterized in that: described radiating doublet (5), (5 ＇) are rectangular microband paste.
5. according to the described RFID anti-metal tag antenna of claim 1 to 4 any one claim, it is characterized in that: described substrate (1) is the glass-epoxy copper-clad plate.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2013103843828A CN103474747A (en) | 2013-08-29 | 2013-08-29 | RFID (Radio Frequency Identification) anti-metal tag antenna |
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| CN2013103843828A CN103474747A (en) | 2013-08-29 | 2013-08-29 | RFID (Radio Frequency Identification) anti-metal tag antenna |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| WO2016141601A1 (en) * | 2015-03-12 | 2016-09-15 | 田艺儿 | Rfid radio-frequency antenna applied to clothing label and book |
| CN106602284A (en) * | 2016-11-30 | 2017-04-26 | 南京邮电大学 | Small-scale metal-resistant broadband tag antenna |
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| CN200965750Y (en) * | 2006-11-13 | 2007-10-24 | 深圳市远望谷信息技术股份有限公司 | Electronic label |
| CN201518348U (en) * | 2009-06-12 | 2010-06-30 | 航天信息股份有限公司 | RFID superfrequency label antenna and circuit using the antenna |
| CN101809595A (en) * | 2007-09-26 | 2010-08-18 | 艾利丹尼森公司 | rfid interposer with impedance matching |
| CN201655968U (en) * | 2009-11-20 | 2010-11-24 | 刘彩凤 | Ultrahigh frequency radio frequency identification tag antenna |
| CN101924268A (en) * | 2009-06-12 | 2010-12-22 | 航天信息股份有限公司 | RFID antenna with asymmetric structure and design method thereof |
| CN201780602U (en) * | 2010-09-06 | 2011-03-30 | 深圳市远望谷信息技术股份有限公司 | Small-size high-gain electronic tag |
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| CN102622647A (en) * | 2012-04-24 | 2012-08-01 | 北京如磐科技有限公司 | RFID (Radio Frequency Identification Device) tag for electronic license plate |
| CN202758380U (en) * | 2012-07-31 | 2013-02-27 | 天津闪联科技有限公司 | Radio frequency label located in special-purpose ear tag for breeding sows |
| CN203164997U (en) * | 2013-01-09 | 2013-08-28 | 国网计量中心 | RFID electronic label |
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2013
- 2013-08-29 CN CN2013103843828A patent/CN103474747A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN200965750Y (en) * | 2006-11-13 | 2007-10-24 | 深圳市远望谷信息技术股份有限公司 | Electronic label |
| CN101809595A (en) * | 2007-09-26 | 2010-08-18 | 艾利丹尼森公司 | rfid interposer with impedance matching |
| CN201518348U (en) * | 2009-06-12 | 2010-06-30 | 航天信息股份有限公司 | RFID superfrequency label antenna and circuit using the antenna |
| CN101924268A (en) * | 2009-06-12 | 2010-12-22 | 航天信息股份有限公司 | RFID antenna with asymmetric structure and design method thereof |
| CN201655968U (en) * | 2009-11-20 | 2010-11-24 | 刘彩凤 | Ultrahigh frequency radio frequency identification tag antenna |
| CN201780602U (en) * | 2010-09-06 | 2011-03-30 | 深圳市远望谷信息技术股份有限公司 | Small-size high-gain electronic tag |
| CN202171820U (en) * | 2011-04-29 | 2012-03-21 | 深圳市远望谷信息技术股份有限公司 | Electronic tag |
| CN102622647A (en) * | 2012-04-24 | 2012-08-01 | 北京如磐科技有限公司 | RFID (Radio Frequency Identification Device) tag for electronic license plate |
| CN202758380U (en) * | 2012-07-31 | 2013-02-27 | 天津闪联科技有限公司 | Radio frequency label located in special-purpose ear tag for breeding sows |
| CN203164997U (en) * | 2013-01-09 | 2013-08-28 | 国网计量中心 | RFID electronic label |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016141601A1 (en) * | 2015-03-12 | 2016-09-15 | 田艺儿 | Rfid radio-frequency antenna applied to clothing label and book |
| 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 |
| CN106602284A (en) * | 2016-11-30 | 2017-04-26 | 南京邮电大学 | Small-scale metal-resistant broadband tag antenna |
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Application publication date: 20131225 |