CN202817177U - Plane opening double-ring antenna of near-field RFID reader-writer used for UHF frequency range - Google Patents
Plane opening double-ring antenna of near-field RFID reader-writer used for UHF frequency range Download PDFInfo
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- CN202817177U CN202817177U CN 201220215515 CN201220215515U CN202817177U CN 202817177 U CN202817177 U CN 202817177U CN 201220215515 CN201220215515 CN 201220215515 CN 201220215515 U CN201220215515 U CN 201220215515U CN 202817177 U CN202817177 U CN 202817177U
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Abstract
The utility model discloses a plane opening double-ring antenna of a near0field RFID reader-writer used for a UHF frequency range. The antenna is of a plane structure, comprising an antenna radiating unit, a dielectric substrate and a matched patch, wherein the antenna radiating unit is attached to one face of the dielectric substrate, and is a radiating body of the antenna, and the matched patch is attached to the other face of the dielectric substrate, and is a ground terminal of the antenna. The antenna is simple in structure and easy to manufacture, by adjusting structure parameters of the antenna, the frequency point and the bandwidth of the resonant frequency of the antenna can be changed in a relatively wide radio frequency spectrum, so as to satisfy radio frequency spectrums of an RFID system which are specified by different countries, and the antenna is suitable for RFID applications of a near-field mobile terminal, such as mobile payment, and article anti-counterfeiting and tracking.
Description
Technical field
The utility model relates near field RFID (radio-frequency (RF) identification) systems technology field, particularly relates to the radio-frequency identification reader/writer antenna of a kind of plane opening twin nuclei.
Background technology
Radio-frequency (RF) identification (Radio Frequency Identification is called for short RFID) technology is a technology of utilizing radiofrequency signal to realize automatically identification and Wireless Data Transmission by backscattering or electromagnetic field couples.Along with proposition and the development of Internet of Things, as important component part indispensable in the Internet of Things, the RFID technology is widely used.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 enter extensive pilot phase, shown that all the business model of RFID technology and portable terminal fusion moves to maturity.The portable terminal such as rfid system and mobile phone integrated can realize that the 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, be subjected to easily the impact of contiguous medium object, can't penetrate the restrictions such as hydrous matter, use in fields such as medicine, retail business, logistics and be subjected to considerable restraint.So the in recent years UHF of near-field coupling and microwave rfid system research is more and more paid attention to.The near field RFID system uses magnetic Field Coupling, in the work of antenna near-field district, preferably performance is arranged under liquid and environment, is suitable for single grade tag recognition, forms complementation with traditional far-field R FID system.Meanwhile, in actual applications, 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 based on the uhf band rfid interrogator antenna of Far Field Scattering principle, must based on the near field operation principle, realize the rfid interrogator antenna miniaturization of mobile terminal device.
The utility model content
It is oversize that the utility model purpose 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 as follows.
Be used for the plane opening double loop antenna of uhf band near field RFID read write line, described antenna is planar structure, comprises antenna radiation unit, medium substrate and coupling paster; Described antenna radiation unit is attached to the one side of medium substrate, is the radiating principal of described antenna; Described coupling paster is attached to the another side of medium substrate, is the earth terminal of described antenna.
The above-mentioned plane opening double loop antenna that is used for uhf band near field RFID read write line, described 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 place, the upper right corner of the first square-shaped metal endless belt disconnects the formation opening and opening is positioned at the top, and the lower right-hand corner of the second square-shaped metal endless belt disconnects the formation opening and opening is positioned at bottom; Described coupling paster is positioned at the medium substrate back side corresponding to 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 described antenna are transmission line excitations or coaxial line excited; Under transmission line excitation, a stimulation terminal and is positioned on the first adjacent square-shaped metal endless belt limit of limit, the 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; Coaxial line excited lower, coaxial inner conductor is positioned near limit, the second square-shaped metal endless belt opening place, and on the first adjacent square-shaped metal endless belt limit, coaxial outer conductor is on the coupling paster with it, 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 described 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 described antenna and coupling paster can be formed by Copper Foil etching technics or electrically conductive ink typography.
Principle of the present utility model is: for studies show that of left hand split ring resonator, 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 utility model has the following advantages and technique effect compared with prior art:
(1) antenna is planar structure, and simple in structure, miniaturization, compact dimensions are easy to realize; Ratio is about D/ λ ≈ 0.08 between the maximal side of radiating element and the resonance frequency wavelength, is integrated in the communication terminal easily.
(2) antenna is operated in the pattern of near field, and energy mainly is stored in the near-field region of antenna with the form of alternation induction field, and radiation loss is little, is not vulnerable to the interference of surrounding environment and far-field region label.
(3) antenna can be by regulating parameter and the combination thereof of antenna structure, and frequency and the bandwidth of the resonance frequency of the described antenna of regular adjustment satisfy the rfid system radio-frequency spectrum that country variant is stipulated.
(4) substrate material of antenna can be selected common paper material, plastic material, ceramic material or epoxy resin board according to applied environment, and selectable range is larger, and is with low cost, environmental.
(5) simple and easy, the environmental protection of the fabrication processing of antenna can be adopted the method manufacturing of electrically conductive ink printing or Copper Foil etching, steady quality, and cost of manufacture is low, is conducive to 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 emulation and the test of antenna.
Embodiment
Below in conjunction with drawings and Examples the utility model is described in further detail, but the claimed scope of the utility model is not limited to the scope of embodiment statement.
Such as 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; Described antenna radiation unit is attached to the one side of medium substrate, is the radiating principal of described antenna; Described coupling paster is attached to the another side of medium substrate, is the earth terminal of described antenna.
Described antenna radiation unit is comprised of two the first square-shaped metal endless belt 1 and the 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 1 nested the second square-shaped metal endless belt 2, two endless belt.The lower right-hand corner that the place, the upper right corner of the first square-shaped metal endless belt 1 disconnects opening 5, the second square-shaped metal endless belt disconnects an opening 6.Described coupling paster 4 is medium substrate 3 back sides that extend to position, limit, the 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 described 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, the 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, the second square-shaped metal endless belt opening place, and on the first adjacent square-shaped metal endless belt limit, coaxial outer conductor is on the coupling paster with it, and its position is positioned under the medium substrate of coaxial inner conductor position.
By 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 described 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 wider radio-frequency spectrum.
By the first square-shaped metal endless belt 1 or the second square-shaped metal endless belt 2 certain width on one side of regulating described antenna radiation unit, can finely tune the bandwidth of described 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 large.
The medium substrate 3 of present embodiment is selected the epoxy resin fiberglass plate, and this medium substrate 3 is also optional with paper substrates (corrugated paper), plastic basis material or ceramic base material.
Job analysis: if the axis such as the first square-shaped metal endless belt 1 and the second square-shaped metal endless belt 2 among Fig. 1 is passed in time dependent magnetic field, then because the discontinuity of ring, circular current can only exist with the form of displacement current, thereby produce the effect that is similar to inductance, 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 to have introduced capacity effect between interior ring and outer shroud, when the magnetic field perpendicular to anchor ring enters resonant ring, can produce respectively induced current at two rings, but because inside and outside driffractive ring opposite direction, the accumulation opposite direction, thus capacity effect produced.Because the upper inductance of ring and interannular electric capacity, this ring has an intrinsic resonance frequency, and the resonance frequency that the utility model is set is 923MHz.Near resonance frequency, can produce extremely strong induced field.In addition, because the opening resonance loop structure size is far smaller than the wavelength of electromagnetic wave in free space, thereby its radiation loss is very little, and the Q value is very large, can obtain 2r/ λ in theory
0The structure of ≈ 1/10, wherein r is the equivalent redius of resonant ring, 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 example, the designed antenna of emulation testing, antenna are operated in 923MHz frequency place, and antenna-10dB bandwidth is about 12MHz, and Fig. 4 has provided the S11 curve chart of emulation and the test of antenna.The antenna size of population is 25mm*25mm, and the 923MHz wavelength is about 325mm, and D/ λ=25/325 ≈ 0.077 has realized the miniaturization of antenna.
Claims (3)
1. be used for the plane opening double loop antenna of uhf band near field RFID read write line, it is characterized in that described antenna is planar structure, comprise antenna radiation unit, medium substrate and coupling paster; Described antenna radiation unit is attached to the one side of medium substrate, is the radiating principal of described antenna; Described coupling paster is attached to the another side of medium substrate, is the earth terminal of described antenna.
2. the plane opening double loop antenna for uhf band near field RFID read write line according to claim 1, it is characterized in that, described 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 place, the upper right corner of the first square-shaped metal endless belt disconnects the formation opening and opening is positioned at the top, and the lower right-hand corner of the second square-shaped metal endless belt disconnects the formation opening and opening is positioned at bottom; Described coupling paster is positioned at the medium substrate back side corresponding to 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 for uhf band near field RFID read write line according to claim 1 and 2 is characterized in that, transmission line excitation or coaxial line excited is adopted in the excitation of antenna; When adopting the transmission line excitation, a stimulation terminal and is positioned on the first adjacent square-shaped metal endless belt limit of limit, the 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; Adopt when coaxial line excited, coaxial inner conductor is positioned near limit, the second square-shaped metal endless belt opening place, and on the first adjacent square-shaped metal endless belt limit, coaxial outer conductor is on the coupling paster with it, and its position is positioned under the medium substrate of coaxial inner conductor position.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220215515 CN202817177U (en) | 2012-05-15 | 2012-05-15 | Plane opening double-ring antenna of near-field RFID reader-writer used for UHF frequency range |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220215515 CN202817177U (en) | 2012-05-15 | 2012-05-15 | Plane opening double-ring antenna of near-field RFID reader-writer used for UHF frequency range |
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| Publication Number | Publication Date |
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| CN202817177U true CN202817177U (en) | 2013-03-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201220215515 Expired - Fee Related CN202817177U (en) | 2012-05-15 | 2012-05-15 | Plane opening double-ring antenna of near-field RFID reader-writer used for UHF frequency range |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102820535A (en) * | 2012-05-15 | 2012-12-12 | 华南理工大学 | Near-field radio frequency identification (RFID) reader plane opening dual-ring antenna for ultra high frequency (UHF) band |
| CN103825099A (en) * | 2014-02-28 | 2014-05-28 | 电子科技大学 | Short distance wireless communication tag antenna |
| CN103972640A (en) * | 2014-04-17 | 2014-08-06 | 杭州电子科技大学 | Ultrahigh RFID near field antenna |
-
2012
- 2012-05-15 CN CN 201220215515 patent/CN202817177U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102820535A (en) * | 2012-05-15 | 2012-12-12 | 华南理工大学 | Near-field radio frequency identification (RFID) reader plane opening dual-ring antenna for ultra high frequency (UHF) band |
| CN103825099A (en) * | 2014-02-28 | 2014-05-28 | 电子科技大学 | Short distance wireless communication tag antenna |
| CN103972640A (en) * | 2014-04-17 | 2014-08-06 | 杭州电子科技大学 | Ultrahigh RFID near field antenna |
| CN103972640B (en) * | 2014-04-17 | 2017-01-25 | 杭州电子科技大学 | Ultrahigh RFID near field antenna |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130320 Termination date: 20160515 |
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| CF01 | Termination of patent right due to non-payment of annual fee |