CN102820535A - Near-field radio frequency identification (RFID) reader plane opening dual-ring antenna for ultra high frequency (UHF) band - Google Patents
Near-field radio frequency identification (RFID) reader plane opening dual-ring antenna for ultra high frequency (UHF) band Download PDFInfo
- Publication number
- CN102820535A CN102820535A CN2012101484135A CN201210148413A CN102820535A CN 102820535 A CN102820535 A CN 102820535A CN 2012101484135 A CN2012101484135 A CN 2012101484135A CN 201210148413 A CN201210148413 A CN 201210148413A CN 102820535 A CN102820535 A CN 102820535A
- Authority
- CN
- China
- Prior art keywords
- antenna
- square
- endless belt
- shaped metal
- metal endless
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Abstract
The invention discloses a near-field radio frequency identification (RFID) reader plane opening dual-ring antenna for an ultra high frequency (UHF) band. The antenna is in a plane structure and comprises an antenna radiating unit, a dielectric substrate and a matching patch, wherein the antenna radiating unit is attached to one surface of the dielectric substrate and is a radiating body of the antenna, and the matching patch is attached to the other surface of the dielectric substrate and is a ground terminal of the antenna. The antenna is simple in structure and easy to produce. Frequency points and bandwidths of resonance frequency of the antenna can be changed within broad radio-wave spectrum through the adjustment of antenna structural parameters. The antenna can meet RFID system radio-wave spectrum which is regulated by different nations and is applied to near-field mobile terminal RFID application such as mobile payment and article anti-faking and tracing.
Description
Technical field
The present invention relates near field RFID (radio frequency identification) systems technology field, particularly relate to the radio-frequency identification reader/writer antenna of a kind of plane opening twin nuclei.
Background technology
Radio frequency identification (Radio Frequency Identification is called for short RFID) technology is a technology of utilizing radiofrequency signal to realize identification automatically and wireless data transmission through backscattering or electromagnetic field couples.Along with the proposition and the development of Internet of Things, as important component part indispensable in the Internet of Things, the RFID technology has obtained using widely.And in the recent period become a shareholder Pudong Development Bank and China Unionpay of China Mobile 40,000,000,000 announces that mobile-phone payment business of new generation will get into extensive pilot phase, shown that all the RFID technology and the business model of portable terminal fusion move to maturity.Portable terminal such as rfid system and mobile phone integrated can realize that mobile Internets such as mobile payment, article anti-counterfeit and tracking use, and has higher commercial value.
The actual environment that RFID uses on the mobile terminal device has proposed the requirement of near fieldization and miniaturization for the rfid interrogator antenna.On the one hand; UHF and microwave rfid system are based on electromagnetic wave propagation and the backscattered far field operation principle between read write line and the label; Receive the influence of contiguous medium object easily, can't penetrate restrictions such as hydrous matter, use in fields such as medicine, retail business, logistics and receive considerable restraint.So the UHF of near field coupling in recent years and the research of microwave rfid system obtain increasing attention.The near field RFID system uses the magnetic field coupling, and the work in the antenna near-field district has preferable performance under liquid and environment, be suitable for single grade tag recognition, forms complementation with traditional far-field R FID system.Meanwhile; In practical application, the distance between mobile phone and the labeled commodity can be not oversize, and the RFID label all is operated in the near-field region of mobile phone RFID reading and writing device antenna; Even requirement must uniquely read the object label of near-field region, the interference of the non-object label in the eliminating far-field region.Therefore, the design of near field reading and writing device antenna is the important step that realizes the mobile phone RFID system.On the other hand, mobile terminal device requires light and flexible, therefore, must have the design requirement of miniaturization as the rfid interrogator antenna on the portable terminal.Traditional far can not satisfy the designing requirement of mobile phone RFID card reader antenna, must realize the rfid interrogator antenna miniaturization of mobile terminal device based on the near field operation principle based on the uhf band rfid interrogator antenna of far field scattering principle.
Summary of the invention
It is oversize that the object of the invention is to overcome existing uhf band rfid interrogator antenna structure, is not easy to be integrated into the shortcoming of portable terminal, is provided for the near field RFID read write line plane opening double loop antenna of uhf band, and concrete technical scheme is following.
Be used for the plane opening double loop antenna of uhf band near field RFID read write line, said antenna is a planar structure, comprises antenna radiation unit, medium substrate and coupling paster; Said antenna radiation unit is the radiating principal of said antenna attached to the one side of medium substrate; Said coupling paster is the earth terminal of said antenna attached to the another side of medium substrate.
The above-mentioned plane opening double loop antenna that is used for uhf band near field RFID read write line; Said antenna radiation unit is to comprise the first square-shaped metal endless belt and the second square-shaped metal endless belt; The geometric center of two square-shaped metal endless belt overlaps; The second square-shaped metal endless belt parallel nested is in the inboard of the first square-shaped metal endless belt; The formation opening is broken off at the place, the upper right corner of the first square-shaped metal endless belt and opening is positioned at the top, and the lower right-hand corner of the second square-shaped metal endless belt is broken off the formation opening and opening is positioned at bottom; Described coupling paster is positioned at the corresponding medium substrate back side of the second square-shaped metal endless belt opening, aligns with the lower end of medium substrate in coupling paster lower end.
The above-mentioned plane opening double loop antenna that is used for uhf band near field RFID read write line, the excitation of said antenna are transmission line excitations or coaxial line excited; Under the transmission line incentive mode, a stimulation terminal and is positioned on the first adjacent square-shaped metal endless belt limit of limit, second square-shaped metal endless belt opening place on antenna radiation unit; Another stimulation terminal the coupling paster on, and be positioned at aforementioned stimulation terminal position under; Under the coaxial line pattern; Coaxial inner conductor is positioned near limit, second square-shaped metal endless belt opening place; And on the first adjacent with it square-shaped metal endless belt limit, coaxial outer conductor is on the coupling paster, and its position is positioned under the medium substrate of coaxial inner conductor position.
The above-mentioned plane opening double loop antenna that is used for uhf band near field RFID read write line, the medium substrate of said antenna is paper material, plastic basis material, ceramic base material or epoxy resin fiberglass plate.
The above-mentioned plane opening double loop antenna that is used for uhf band near field RFID read write line, the radiating element of said antenna can be formed by Copper Foil etching technics or electrically conductive ink typography with the coupling paster.
Principle of the present invention is: the research for the left hand split ring resonator shows, near its resonance frequency, can excite extremely strong induced field, therefore can well be applied in the RFID near field communication system based on inductance coupling high.
The present invention has the following advantages and technique effect compared with prior art:
(1) antenna is a planar structure, and simple in structure, miniaturization, compact dimensions are easy to realize; Ratio is about
between the maximal side resonant frequency wavelength of radiating element, is integrated in the communication terminal easily.
(2) antenna is operated in the pattern of near field, energy mainly with the stored in form of alternation induction field in the near-field region of antenna, radiation loss is little, is not vulnerable to the interference of surrounding environment and far-field region label.
(3) antenna can clocklike be adjusted the frequency and the bandwidth of the resonance frequency of said antenna through regulating the parameter and the combination thereof of antenna structure, satisfies the rfid system radio-frequency spectrum of country variant regulation.
(4) substrate material of antenna can be selected common paper material, plastic material, ceramic material or epoxy resin board for use according to applied environment, and selectable range is bigger, and is with low cost, environmental.
(5) simple and easy, the environmental protection of antenna making technological process can be adopted the method manufacturing of electrically conductive ink printing or Copper Foil etching, steady quality, and cost of manufacture is low, helps large-scale production.
Description of drawings
Fig. 1 is the structure front view of the plane opening double loop antenna that is used for uhf band near field RFID read write line in the execution mode;
Fig. 2 is the structure dorsal view of antenna shown in Figure 1;
Fig. 3 is the longitudinal cross-section end view of antenna illustrated in figures 1 and 2;
Fig. 4 is the S11 curve chart of the emulation and the test of antenna in the execution mode.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is done further detailed explanation, but the scope that the present invention requires to protect is not limited to the scope that embodiment explains.
Like Fig. 1, Fig. 2, shown in Figure 3, be used for the plane opening double loop antenna of uhf band near field RFID read write line, be planar structure, comprise antenna radiation unit, medium substrate and coupling paster; Said antenna radiation unit is the radiating principal of said antenna attached to the one side of medium substrate; Said coupling paster is the earth terminal of said antenna attached to the another side of medium substrate.
Said antenna radiation unit is made up of two the first square-shaped metal endless belt 1 and second square-shaped metal endless belt 2 with opening.The geometric center of the first square-shaped metal endless belt 1 and the second square-shaped metal endless belt 2 overlaps, and has gap 9 between the first square-shaped metal endless belt, the 1 nested second square-shaped metal endless belt, 2, two endless belt.Break off the lower right-hand corner of opening 5, the second square-shaped metal endless belt and break off an opening 6 at the place, the upper right corner of the first square-shaped metal endless belt 1.Described coupling paster 4 is medium substrate 3 back sides that extend to position, limit, second square-shaped metal endless belt opening 5 place from medium substrate 3 dorsal edge near the second square-shaped metal endless belt opening, 5 positions.
The excitation of said antenna can be transmission line excitation or coaxial line excited.Stimulation terminal (a perhaps coaxial inner conductor) 7 and is positioned on the first adjacent square-shaped metal endless belt limit of limit, second square-shaped metal endless belt opening 6 place on antenna radiation unit; Another (perhaps coaxial outer conductor) 8 the coupling paster on, and be positioned at aforementioned stimulation terminal position under; Under the coaxial line pattern; Coaxial inner conductor is positioned near limit, second square-shaped metal endless belt opening place; And on the first adjacent with it square-shaped metal endless belt limit, coaxial outer conductor is on the coupling paster, and its position is positioned under the medium substrate of coaxial inner conductor position.
Through regulating the first square-shaped metal endless belt, 1 length of side of antenna radiation unit; The spacing 9 of the first square-shaped metal endless belt 1 and the second square-shaped metal endless belt 2; The width of the opening 5 of the first square-shaped metal endless belt 1 and the position at place; The frequency of said antenna resonant frequency can be adjusted in the width of the opening 6 of the second square-shaped metal endless belt 2 and the position at place in the radio-frequency spectrum of broad.
Through the first square-shaped metal endless belt 1 or the second square-shaped metal endless belt, 2 certain width on one side of regulating said antenna radiation unit, can finely tune the bandwidth of said antenna resonant frequency.General, on one side when the first square-shaped metal endless belt 1 or the second square-shaped metal endless belt 2 when certain broadens, the resonant frequency bandwidth phase strain of reading and writing device antenna is big.
The medium substrate 3 of present embodiment is selected the epoxy resin fiberglass plate for use, and this medium substrate 3 also can be selected paper substrates (corrugated paper), plastic basis material or ceramic base material for use.
Job analysis a: if mM disodium hydrogen phosphate is passed the axis like the first square-shaped metal endless belt 1 and the second square-shaped metal endless belt 2 among Fig. 1; Then because the discontinuity of ring; Circular current can only exist with the form of displacement current, thereby produces the effect that is similar to inductance, and the space between two rings produces capacity effect in addition; Both combine, and whole split ring result will show as a resonator.Its characteristics mainly are between interior ring and outer shroud, to have introduced capacity effect; When the magnetic field perpendicular to anchor ring gets into resonant ring, can produce induced current respectively at two rings, but because inside and outside driffractive ring is in the opposite direction; Accumulation is in the opposite direction, thereby produces capacity effect.Because ring is gone up inductance and interannular electric capacity, this ring has an intrinsic resonance frequency, and the resonance frequency that the present invention sets is 923MHz.Near resonance frequency, can produce extremely strong induced field.In addition; Because the split ring resonator physical dimension is far smaller than the wavelength of electromagnetic wave in free space; Thereby its radiation loss is very little; The Q value is very big; Can obtain the structure of
in theory; Wherein
is the equivalent redius of resonant ring, and its planar structure and the little advantage of electric size are convenient to make the miniaturization with antenna.
The first square-shaped metal endless belt 1 of the antenna radiation unit of present embodiment and the second square-shaped metal endless belt 2 and coupling paster 4 are formed by the Copper Foil etching, also can be formed by the electrically conductive ink printing.
Only as a kind of instance, emulation testing institute design antenna, antenna is operated in 923MHz frequency place, and antenna-10dB bandwidth is about 12MHz, and Fig. 4 has provided the S11 curve chart of the emulation and the test of antenna.The antenna size of population is 25mm*25mm; The 923MHz wavelength is about 325mm;
realized the miniaturization of antenna.
Claims (5)
1. be used for the plane opening double loop antenna of uhf band near field RFID read write line, it is characterized in that said antenna is a planar structure, comprise antenna radiation unit, medium substrate and coupling paster; Said antenna radiation unit is the radiating principal of said antenna attached to the one side of medium substrate; Said coupling paster is the earth terminal of said antenna attached to the another side of medium substrate.
2. the plane opening double loop antenna that is used for uhf band near field RFID read write line according to claim 1; It is characterized in that; Said antenna radiation unit is to comprise the first square-shaped metal endless belt and the second square-shaped metal endless belt; The geometric center of two square-shaped metal endless belt overlaps; The second square-shaped metal endless belt parallel nested is in the inboard of the first square-shaped metal endless belt, and the formation opening is broken off at place, the upper right corner of the first square-shaped metal endless belt and opening is positioned at the top, and the lower right-hand corner of the second square-shaped metal endless belt is broken off the formation opening and opening is positioned at bottom; Described coupling paster is positioned at the corresponding medium substrate back side of the second square-shaped metal endless belt opening, aligns with the lower end of medium substrate in coupling paster lower end.
3. the plane opening double loop antenna that is used for uhf band near field RFID read write line according to claim 1 is characterized in that, the excitation of said antenna is transmission line excitation or coaxial line excited; Under the transmission line incentive mode, a stimulation terminal and is positioned on the first adjacent square-shaped metal endless belt limit of limit, second square-shaped metal endless belt opening place on antenna radiation unit; Another stimulation terminal the coupling paster on, and be positioned at aforementioned stimulation terminal position under; Under the coaxial line pattern; Coaxial inner conductor is positioned near limit, second square-shaped metal endless belt opening place; And on the first adjacent with it square-shaped metal endless belt limit, coaxial outer conductor is on the coupling paster, and its position is positioned under the medium substrate of coaxial inner conductor position.
4. according to each described plane opening double loop antenna that is used for uhf band near field RFID read write line of claim 1 ~ 3, it is characterized in that the medium substrate of said antenna is paper material, plastic basis material, ceramic base material or epoxy resin fiberglass plate.
5. according to each described plane opening double loop antenna that is used for uhf band near field RFID read write line of claim 1 ~ 3, it is characterized in that the radiating element of said antenna is formed by Copper Foil etching technics or electrically conductive ink typography with the coupling paster.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101484135A CN102820535A (en) | 2012-05-15 | 2012-05-15 | Near-field radio frequency identification (RFID) reader plane opening dual-ring antenna for ultra high frequency (UHF) band |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101484135A CN102820535A (en) | 2012-05-15 | 2012-05-15 | Near-field radio frequency identification (RFID) reader plane opening dual-ring antenna for ultra high frequency (UHF) band |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102820535A true CN102820535A (en) | 2012-12-12 |
Family
ID=47304479
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012101484135A Pending CN102820535A (en) | 2012-05-15 | 2012-05-15 | Near-field radio frequency identification (RFID) reader plane opening dual-ring antenna for ultra high frequency (UHF) band |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102820535A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103606744A (en) * | 2013-11-07 | 2014-02-26 | 中国计量学院 | Dual concentric opening circular patch antenna |
| CN103700931A (en) * | 2013-12-13 | 2014-04-02 | 中科院杭州射频识别技术研发中心 | Small-size fractal-fork anti-metallic tag antenna loaded with split-ring resonators |
| CN104898769A (en) * | 2014-03-03 | 2015-09-09 | 联想(北京)有限公司 | Wearable electronic equipment |
| CN106549210A (en) * | 2016-12-06 | 2017-03-29 | 华南理工大学 | The insensitive double-deck Chip-free label antenna of a kind of high power capacity and metal |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070188385A1 (en) * | 2006-02-16 | 2007-08-16 | Hyde Roderick A | Variable metamaterial apparatus |
| CN202817177U (en) * | 2012-05-15 | 2013-03-20 | 华南理工大学 | Plane opening double-ring antenna of near-field RFID reader-writer used for UHF frequency range |
-
2012
- 2012-05-15 CN CN2012101484135A patent/CN102820535A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070188385A1 (en) * | 2006-02-16 | 2007-08-16 | Hyde Roderick A | Variable metamaterial apparatus |
| CN202817177U (en) * | 2012-05-15 | 2013-03-20 | 华南理工大学 | Plane opening double-ring antenna of near-field RFID reader-writer used for UHF frequency range |
Non-Patent Citations (1)
| Title |
|---|
| JIAN-WEN CAO, ZE-MING XIE1, XIAO-ZHENG LAI；: ""A COMPACT NEAR FIELD UHF RFID READER ANTENNA USING SRR"", 《MACHINE LEARNING AND CYBERNETICS (ICMLC)》, vol. 1, 13 July 2011 (2011-07-13) * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103606744A (en) * | 2013-11-07 | 2014-02-26 | 中国计量学院 | Dual concentric opening circular patch antenna |
| CN103700931A (en) * | 2013-12-13 | 2014-04-02 | 中科院杭州射频识别技术研发中心 | Small-size fractal-fork anti-metallic tag antenna loaded with split-ring resonators |
| CN103700931B (en) * | 2013-12-13 | 2016-01-20 | 中科院杭州射频识别技术研发中心 | A kind of small fractal crotch anti-metal tag antenna of loading opening resonant ring |
| CN104898769A (en) * | 2014-03-03 | 2015-09-09 | 联想(北京)有限公司 | Wearable electronic equipment |
| CN104898769B (en) * | 2014-03-03 | 2018-08-10 | 联想(北京)有限公司 | A kind of wearable electronic equipment |
| CN106549210A (en) * | 2016-12-06 | 2017-03-29 | 华南理工大学 | The insensitive double-deck Chip-free label antenna of a kind of high power capacity and metal |
| CN106549210B (en) * | 2016-12-06 | 2023-03-21 | 华南理工大学 | High-capacity and metal-insensitive double-layer chip-free tag antenna |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Ren et al. | A robust UHF near-field RFID reader antenna | |
| US8289165B2 (en) | RFID device with conductive loop shield | |
| US8508429B2 (en) | Radio communication equipment | |
| US7633445B2 (en) | Radio frequency identification tag and antenna for radio frequency identification tag | |
| CN106339746B (en) | Multi-frequency transponder with single antenna | |
| EP1895620B1 (en) | Rfid tag antenna and rfid tag | |
| CN101752648B (en) | Broadband RFID UHF antenna and tag and manufacturing method of tag | |
| US10229298B2 (en) | RFID devices using metamaterial antennas | |
| Li et al. | Eye-shaped segmented reader antenna for near-field UHF RFID applications | |
| CN103715499B (en) | Annular UHF near-field RFID reader-writer antenna | |
| CN104733846A (en) | Small UHF meander-line dipole anti-metallic RFID label antenna | |
| CN201332142Y (en) | Broadband RFID ultra-high frequency antenna and e-tag using same | |
| CN101667678B (en) | Radio frequency identification antenna | |
| CN102820535A (en) | Near-field radio frequency identification (RFID) reader plane opening dual-ring antenna for ultra high frequency (UHF) band | |
| Bansal et al. | Platform tolerant dual‐band UHF‐RFID tag antenna with enhanced read range using artificial magnetic conductor structures | |
| CN202817177U (en) | Plane opening double-ring antenna of near-field RFID reader-writer used for UHF frequency range | |
| Zuffanelli | Antenna design solutions for RFID tags based on metamaterial-inspired resonators and other resonant structures | |
| CN101527391A (en) | Plate-shaped feeding air-dielectric patch antenna | |
| Bansal et al. | Compact meandered folded-dipole RFID tag antenna for dual band operation in UHF range | |
| Ding et al. | A novel magnetic coupling UHF near field RFID reader antenna based on multilayer-printed-dipoles array | |
| Xing et al. | Dual-band RFID antenna for 0.92 GHz near-field and 2.45 GHz far-field applications | |
| CN103985958A (en) | Small metal resistance type UHF tag antenna based on EBG structure | |
| CN104466353B (en) | Ultra-wide band can integrated read-write equipment circuit module uhf band RFID reader antenna | |
| CN203839507U (en) | Mini anti-metal UHF label antenna based on EBG structure | |
| Ren et al. | A novel design for UHF near-field RFID reader antenna based on traveling wave |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20121212 |