CN102110871A - Radio frequency identification tag antenna suitable for metal surface - Google Patents
Radio frequency identification tag antenna suitable for metal surface Download PDFInfo
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- CN102110871A CN102110871A CN2011100572702A CN201110057270A CN102110871A CN 102110871 A CN102110871 A CN 102110871A CN 2011100572702 A CN2011100572702 A CN 2011100572702A CN 201110057270 A CN201110057270 A CN 201110057270A CN 102110871 A CN102110871 A CN 102110871A
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Abstract
The invention discloses a radio frequency identification tag antenna suitable for a metal surface. The radio frequency identification tag antenna comprises an upper layer dielectric slab and a lower layer dielectric slab which are adhered to each other, a metal layer arranged on an upper surface of the upper layer dielectric slab, a tag chip port formed on a central axis of the upper layer dielectric slab, and a metal earth plate arranged on a lower surface of the lower layer dielectric slab, wherein two sides of the tag chip port are connected with a microstrip feed circuit and are connected with a microstrip radiation unit through the microstrip feed circuit; and two lateral margins of the microstrip radiation unit are connected with the metal earth plate through a short-circuited arm respectively to form a planar inverted-F antenna (PIFE) structure. Under the condition of maintaining a small antenna size, the antenna is in conjugate match with a tag chip at a resonance frequency (915MHz), so that the tag chip obtains the maximum power, and has low return loss in an ultra high frequency (UHF) frequency range, and high impedance bandwidth and radiation characteristics.
Description
Technical field
The invention belongs to the REID field, be specifically related to a kind of hyperfrequency (UHF) radio-frequency (RF) identification (RFID) label antenna that is applicable to the metal surface.
Background technology
In recent years, the RFID technology has obtained using widely in a lot of fields, and it is a kind of non-contact automatic identification technology of realizing based on radio frequency principle.The operating frequency of rfid system has low frequency 100-500KHz, high frequency 13.56MHz, hyper band 860-960MHz, and microwave frequency band 2.45GHz and 5.8GHz.Antenna has been played the part of crucial role as the air interface of radio-frequency (RF) identification in rfid system.Because label is secured at and is identified on the object, so require the area of label to want enough little, this just requires label antenna to have small size.In passive RFID system, require antenna and chip conjugate impedance match, thereby, improve the efficient of antenna simultaneously for chip provides maximal efficiency.In addition, the impedance of label chip is not 50 ohm usually, and it is very little to show as resistance, and reactance is very big.During design RFID label antenna, also should make antenna structure simple and easy of integration as far as possible.Yet such design tends to bring some adverse influences, such as frequency range is narrow, and efficient is low.How to make antenna keep realizing under the prerequisite of certain performance the miniaturization of antenna in required frequency range, become one of focus of international research.
Present most of label antenna, when being placed on metal object surface, because the tangential electric field of high conductivity body surface is close to zero, the label two ends will can not produce needed electrical potential difference, and antenna just can't operate as normal like this.Microstrip antenna for commonly used can adopt PIFA (planar inverted-F antenna) structure to reduce the size of antenna, reduces the influence of metal object to antenna performance simultaneously.But the ground plate size of most of PIFA is bigger than dielectric layer, and dielectric layer is generally air layer, has reduced the fastness of antenna like this, and the impedance of this class antenna all is 50 ohm generally in addition, is not suitable for the RFID label antenna.In order to satisfy different coupling requirements, antenna needs and can adjust within the specific limits input impedance, so just needs structure that is used for impedance matching of design.
Summary of the invention
Goal of the invention: the objective of the invention is at the deficiencies in the prior art, provide a kind of volume the little RFID antenna that is applicable to the metal surface, this antenna and label chip can reach conjugate impedance match in centre frequency, at uhf band lower return loss are arranged.
Technical scheme: the RFID antenna that is applicable to the metal surface of the present invention, the top dielectric plate and the layer dielectric plate that comprise mutual applying, and be arranged on metal level, the label chip port of the upper surface of top dielectric plate and be arranged on the metal ground plate of the lower surface of layer dielectric plate, described metal level is made up of little band radiating element and microstrip-fed loop two parts, and described little band radiating element is that symmetry axis is symmetrical arranged and forms by two rectangular microstrip radiation patch with the axis of upper strata dielectric-slab; Described label chip port is arranged on the axis of described top dielectric plate, and its both sides link to each other with described microstrip-fed loop, links to each other with described little band radiating element by described microstrip-fed loop; The place, both sides of the edge of described little band radiating element links to each other with described metal ground plate by the short circuit arm respectively and constitutes the PIFA structure.
The resonance frequency of antenna of the present invention is 915MHz, and has lower return loss and good radiation characteristic at uhf band.
The present invention compared with prior art, its beneficial effect is:
1. in the label antenna of the present invention, the edge of little band radiation patch of symmetry links to each other with metal ground plate by the short circuit arm and constitutes the PIFA structure, this structure has reduced the size of antenna on the one hand, make also that on the other hand this antenna reduces the influence of metal pair antenna performance when being positioned over metal object surface, thereby be suitable as the label antenna of metal surface; The both sides of the edge of little band radiating element connect the short circuit arm can make the maximum and the minimum value that can form electric field in the centre of radiating element simultaneously;
The present invention by regulating little band radiating element length and the structure and the size in width and microstrip-fed loop make antenna in centre frequency and chip conjugate impedance match, and good in the uhf band antenna performance, guarantee that antenna transmission reaches maximum to the power of chip;
3. the present invention adopts the two layer medium plate structure, can reduce return loss and increase bandwidth;
4. metal ground plate of the present invention and layer dielectric plate measure-alike helps improving the fastness of antenna;
5. antenna of the present invention can effectively cover the frequency range that requires of UHF, i.e. 840:960MHz, and have characteristics simple in structure, that volume is little and cost is low.
In sum, antenna of the present invention is under the situation that keeps less antenna size, locate and the label chip conjugate impedance match in resonance frequency (915MHz), make label chip obtain maximum power, at uhf band, return loss is lower, and have impedance bandwidth and radiation characteristic preferably, when it was used for metal label, antenna performance did not almost have any influence at the UHF working frequency range, also is easy to carry out integrated with other circuit.
Description of drawings
Fig. 1 (a) is the vertical view of antenna of the present invention.
Fig. 1 (b) is the left view of antenna of the present invention.
Fig. 2 (a) is antenna resistance characteristic Simulation figure of the present invention.
Fig. 2 (b) is antenna reactance characteristic Simulation figure of the present invention.
Fig. 3 is the return loss analogous diagram of antenna of the present invention.
Fig. 4 is the gain analogous diagram of antenna of the present invention.
Embodiment
Below in conjunction with accompanying drawing, technical solution of the present invention is elaborated, but protection scope of the present invention is not limited to described embodiment.
Being the structural representation of antenna as shown in Figure 1, 2, (a) being vertical view, (b) is end view.Antenna of the present invention comprises the dielectric-slab of two-layer mutual applying, top dielectric plate 1 and layer dielectric plate 2, and be arranged on metal level, the label chip port 5 of the upper surface of top dielectric plate 1 and be arranged on the metal ground plate 7 of the lower surface of layer dielectric plate 2, wherein, the metal level of top dielectric plate 1 upper surface is made up of little band radiating element 3 and microstrip-fed loop 4 two parts, and little band radiating element 3 is that symmetry axis is symmetrical arranged and forms by two rectangular microstrip radiation patch with the axis of upper strata dielectric-slab 1; Label chip port 5 is arranged on the axis of top dielectric plate 1, and its left and right sides links to each other with microstrip-fed loop 4, links to each other with little band radiating element 3 by microstrip-fed loop 4; The place, both sides of the edge of little band radiating element 3 is connected to a short circuit arm 6 respectively, and short circuit arm 6 links to each other with the metal ground plate 7 of layer dielectric plate 2 lower surfaces and constitutes the PIFA structure.
Preferred as a comparison scheme, among the present invention, top dielectric plate 1 adopts RF4 sheet material, and dielectric constant is 4.4, and loss tangent is 0.02, and the thickness of sheet material is 1.6mm.Layer dielectric plate 2 adopts foamed material, and dielectric constant is 1.03, and loss tangent is 0.0001, and sheet metal thickness is 3mm.The metal material of metal level and metal ground plate is a copper, thick 0.018mm.Label antenna port 5 is the antenna load port, promptly connect label chip, the label chip that this antenna adopts is ALN-9338-R, the size of little band radiating element 3, microstrip-fed loop 4, short circuit arm 6 is by appropriate design, can make the characteristic impedance of label chip port and the characteristic impedance conjugate impedance match of label chip.The structure that adopts two layer medium is in order to reduce return loss and to increase bandwidth.Ground plate has identical size with dielectric-slab, helps improving the fastness of antenna like this.
Fig. 2 (a) is antenna resistance characteristic Simulation figure for the impedance operator analogous diagram of antenna of the present invention, (b) is antenna reactance characteristic Simulation figure.As we can see from the figure, this antenna is Z at the resistance value of 915MHz
A=6.09+j126.65 Ω, chip is Z at the resistance value of this frequency
C=6.2-j127 Ω, and the variation of the real part of antenna feed impedance and imaginary part is comparatively slow, this shows, and label antenna and chip can be realized conjugate impedance match preferably near 915MHz.
Fig. 3 is the return loss analogous diagram of antenna of the present invention.As we can see from the figure, this antenna resonance has realized good impedance matching herein at 915MHz.S
11The frequency range of＜-10dB is 800MHz:1GHz, and promptly impedance bandwidth is 200MHz (21.9%), can compensate the frequency shift (FS) that produces when label places object.
Fig. 4 is an antenna gain analogous diagram of the present invention.As we can see from the figure, the maximum gain of this antenna is-0.78dB, and the H face is realized omnidirectional radiation, thereby guarantees that antenna can both be caught by read write line in any angle.
As mentioned above, although represented and explained the present invention that with reference to specific preferred embodiment it shall not be construed as the restriction to the present invention self.Under the spirit and scope of the present invention prerequisite that does not break away from the claims definition, can make various variations in the form and details to it.
Claims (5)
1. RFID antenna that is applicable to the metal surface, the top dielectric plate (1) and the layer dielectric plate (2) that comprise mutual applying, and be arranged on metal level, the label chip port (5) of the upper surface of top dielectric plate (1) and be arranged on the metal ground plate (7) of the lower surface of layer dielectric plate (2), it is characterized in that: described metal level is made up of little band radiating element (3) and microstrip-fed loop (4) two parts, and described little band radiating element (3) is that symmetry axis is symmetrical arranged and forms by two rectangular microstrip radiation patch with the axis of upper strata dielectric-slab (1); Described label chip port (5) is arranged on the axis of described top dielectric plate (1), and its both sides link to each other with described microstrip-fed loop (4), links to each other with described little band radiating element (3) by described microstrip-fed loop (4); The place, both sides of the edge of described little band radiating element (3) links to each other with described metal ground plate (7) by short circuit arm (6) respectively and constitutes the PIFA structure.
2. the RFID antenna that is applicable to the metal surface according to claim 1 is characterized in that: the size of described metal ground plate (7) and described layer dielectric plate (2) measure-alike.
3. the RFID antenna that is applicable to the metal surface according to claim 1 is characterized in that: described top dielectric plate (1) is a FR4 sheet material, and dielectric constant is 4.4, and loss tangent is 0.02, and the thickness of sheet material is 1.6mm.
4. the RFID antenna that is applicable to the metal surface according to claim 1 is characterized in that: described layer dielectric plate (2) is a foamed material, and dielectric constant is 1.03, and loss tangent is 0.0001, and sheet metal thickness is 3mm.
5. the RFID antenna that is applicable to the metal surface according to claim 1 is characterized in that: the metal material of described metal level and metal ground plate (7) is a copper, thick 0.018mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100572702A CN102110871A (en) | 2011-03-10 | 2011-03-10 | Radio frequency identification tag antenna suitable for metal surface |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100572702A CN102110871A (en) | 2011-03-10 | 2011-03-10 | Radio frequency identification tag antenna suitable for metal surface |
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| CN102110871A true CN102110871A (en) | 2011-06-29 |
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| CN2011100572702A Pending CN102110871A (en) | 2011-03-10 | 2011-03-10 | Radio frequency identification tag antenna suitable for metal surface |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102263324A (en) * | 2011-07-28 | 2011-11-30 | 群淂数码科技（上海）有限公司 | Radio frequency identification (RFID) tag antenna |
| CN102521645A (en) * | 2011-12-29 | 2012-06-27 | 上海大学 | Broadband anti-metal radio-frequency identification tag and special mounting structure for metal surface thereof |
| CN102709688A (en) * | 2012-06-11 | 2012-10-03 | 杭州电子科技大学 | RFID (radio frequency identification) tag antenna simulation design method and tag antenna |
| CN102916249A (en) * | 2012-10-25 | 2013-02-06 | 深圳先进技术研究院 | Wideband radio frequency label antenna |
| CN102956966A (en) * | 2011-08-12 | 2013-03-06 | 卡西欧计算机株式会社 | Patch antenna device and radio wave receiver |
| CN103138044A (en) * | 2011-11-25 | 2013-06-05 | 刘智佳 | Microstrip patch type radio frequency identification (RFID) tag antenna |
| CN103434759A (en) * | 2013-08-21 | 2013-12-11 | 江苏联浩科技有限公司 | Electronic tag cigarette packaging box capable of improving read-write sensitivity |
| CN103886362A (en) * | 2012-12-24 | 2014-06-25 | 中国科学院上海高等研究院 | RFID (Radio Frequency Identification) tag and manufacturing method thereof |
| CN103886361A (en) * | 2012-12-24 | 2014-06-25 | 中国科学院上海高等研究院 | RFID (Radio Frequency Identification) anti-metallic tag and manufacturing method thereof |
| CN104810614A (en) * | 2015-03-20 | 2015-07-29 | 西北工业大学 | Device for enhancing phased array wide angle scanning gain |
| CN106839965A (en) * | 2017-03-13 | 2017-06-13 | 同济大学 | Label, measuring system and its application process for measuring metal component surface strain |
| CN106981722A (en) * | 2017-05-10 | 2017-07-25 | 江苏明联电子科技有限公司 | A kind of flexible anti-metal RFID label antenna |
| CN108899647A (en) * | 2018-07-04 | 2018-11-27 | 北京宏诚创新科技有限公司 | Novel passive ultrahigh-frequency tag antenna applied to printing |
| CN112103635A (en) * | 2020-08-11 | 2020-12-18 | 东信和平科技股份有限公司 | RFID tag antenna circuit board and RFID tag antenna |
| CN114765308A (en) * | 2021-01-13 | 2022-07-19 | 矽品精密工业股份有限公司 | Electronic device and circuit board thereof |
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| US20080036673A1 (en) * | 2006-08-09 | 2008-02-14 | Fujitsu Limited | RFID tag and manufacturing method thereof |
| CN101385202A (en) * | 2005-12-14 | 2009-03-11 | 堪萨斯州立大学 | Microstrip antenna for rfid device |
| CN101388491A (en) * | 2008-10-24 | 2009-03-18 | 苏州中科集成电路设计中心有限公司 | Micro-strip dual-unit array transceiving antenna for RFID reader |
| CN101527391A (en) * | 2009-04-15 | 2009-09-09 | 南京邮电大学 | Plate-shaped feeding air-dielectric patch antenna |
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| CN101385202A (en) * | 2005-12-14 | 2009-03-11 | 堪萨斯州立大学 | Microstrip antenna for rfid device |
| US20080036673A1 (en) * | 2006-08-09 | 2008-02-14 | Fujitsu Limited | RFID tag and manufacturing method thereof |
| CN101388491A (en) * | 2008-10-24 | 2009-03-18 | 苏州中科集成电路设计中心有限公司 | Micro-strip dual-unit array transceiving antenna for RFID reader |
| CN101527391A (en) * | 2009-04-15 | 2009-09-09 | 南京邮电大学 | Plate-shaped feeding air-dielectric patch antenna |
Cited By (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102263324A (en) * | 2011-07-28 | 2011-11-30 | 群淂数码科技（上海）有限公司 | Radio frequency identification (RFID) tag antenna |
| CN102263324B (en) * | 2011-07-28 | 2016-05-18 | 群淂数码科技（上海）有限公司 | RFID antenna |
| CN102956966A (en) * | 2011-08-12 | 2013-03-06 | 卡西欧计算机株式会社 | Patch antenna device and radio wave receiver |
| CN103138044A (en) * | 2011-11-25 | 2013-06-05 | 刘智佳 | Microstrip patch type radio frequency identification (RFID) tag antenna |
| CN102521645B (en) * | 2011-12-29 | 2014-12-03 | 上海大学 | Broadband anti-metal radio-frequency identification tag and special mounting structure for metal surface thereof |
| CN102521645A (en) * | 2011-12-29 | 2012-06-27 | 上海大学 | Broadband anti-metal radio-frequency identification tag and special mounting structure for metal surface thereof |
| CN102709688A (en) * | 2012-06-11 | 2012-10-03 | 杭州电子科技大学 | RFID (radio frequency identification) tag antenna simulation design method and tag antenna |
| CN102916249A (en) * | 2012-10-25 | 2013-02-06 | 深圳先进技术研究院 | Wideband radio frequency label antenna |
| CN103886362B (en) * | 2012-12-24 | 2018-01-09 | 中国科学院上海高等研究院 | RFID label tag and its manufacture method |
| CN103886361A (en) * | 2012-12-24 | 2014-06-25 | 中国科学院上海高等研究院 | RFID (Radio Frequency Identification) anti-metallic tag and manufacturing method thereof |
| CN103886362A (en) * | 2012-12-24 | 2014-06-25 | 中国科学院上海高等研究院 | RFID (Radio Frequency Identification) tag and manufacturing method thereof |
| CN103434759B (en) * | 2013-08-21 | 2015-11-18 | 江苏联浩科技有限公司 | There is the electronic tag cigarette packing case improving read-write sensitivity |
| CN103434759A (en) * | 2013-08-21 | 2013-12-11 | 江苏联浩科技有限公司 | Electronic tag cigarette packaging box capable of improving read-write sensitivity |
| CN104810614A (en) * | 2015-03-20 | 2015-07-29 | 西北工业大学 | Device for enhancing phased array wide angle scanning gain |
| CN104810614B (en) * | 2015-03-20 | 2018-10-19 | 西北工业大学 | A kind of device improving phased array large-angle scanning gain |
| CN106839965A (en) * | 2017-03-13 | 2017-06-13 | 同济大学 | Label, measuring system and its application process for measuring metal component surface strain |
| CN106981722A (en) * | 2017-05-10 | 2017-07-25 | 江苏明联电子科技有限公司 | A kind of flexible anti-metal RFID label antenna |
| CN108899647A (en) * | 2018-07-04 | 2018-11-27 | 北京宏诚创新科技有限公司 | Novel passive ultrahigh-frequency tag antenna applied to printing |
| CN112103635A (en) * | 2020-08-11 | 2020-12-18 | 东信和平科技股份有限公司 | RFID tag antenna circuit board and RFID tag antenna |
| CN114765308A (en) * | 2021-01-13 | 2022-07-19 | 矽品精密工业股份有限公司 | Electronic device and circuit board thereof |
| CN114765308B (en) * | 2021-01-13 | 2024-04-19 | 矽品精密工业股份有限公司 | Electronic device and circuit board thereof |
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Application publication date: 20110629 |