CN101916907A - Ultrahigh frequency band near field RFID reader-writer antenna - Google Patents
Ultrahigh frequency band near field RFID reader-writer antenna Download PDFInfo
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- CN101916907A CN101916907A CN2010102211935A CN201010221193A CN101916907A CN 101916907 A CN101916907 A CN 101916907A CN 2010102211935 A CN2010102211935 A CN 2010102211935A CN 201010221193 A CN201010221193 A CN 201010221193A CN 101916907 A CN101916907 A CN 101916907A
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Abstract
The invention discloses an ultrahigh frequency band near field RFID reader-writer antenna. A coaxial connector is connected with one end of a coplanar waveguide on a PCB base plate; the other end of the coplanar waveguide is connected to one end of a coplanar strip line by a balun; the other end of the coplanar strip line is connected with a resistor; the PCB base plate and a metal floor are supported by nylon columns on four corners of the PCB base plate; an air layer is formed between the PCB base plate and the metal floor; and a conduction band width, a gap width between conduction bands, the dielectric constant of the PCB base plate, the thickness of the air layer, the impedance of the balun and the parameters of a resistance value are subject to properly matching the impedance among the coplanar waveguide, the balun, the coplanar strip line and the resistor. The invention has relatively wide frequency band and relatively strong magnetic field, and the antennas with different lengths can be conveniently designed according to the application requirements under different circumstances.
Description
Technical field
The invention belongs to the antenna structure design field, relate to a kind of rfid interrogator antenna.
Background technology
RFID (Radio Frequency Identification, radio-frequency (RF) identification) technology is a kind of non-contacting automatic identification technology.Reading and writing device antenna plays key effect in rfid system.The frequency of reading and writing device antenna work has low frequency (135kHz is following), high frequency (13.56MHz), hyperfrequency (860-960MHz) and microwave frequency band (more than the 2.4GHz) etc.Reading and writing device antenna is divided according to operating distance, can be divided near field antenna and far field antenna.The near field reading and writing device antenna that works in hyperfrequency is highly suitable for work in narrow space.Because near field antenna is only locating that closely stronger electromagnetic field is just arranged, the intensity of distance electromagnetic fields far away slightly sharply weakens, and the far gain of this antenna is very low, so the large-area metal around the antenna can't exert an influence to the performance of antenna.
Because ultrahigh frequency band near field RFID reader-writer antenna has a lot of premium properties, a lot of companies and individual have done many correlative studys, and have product to come out.Impinj company has proposed a lot of antennas based on coupling loop; Siemens company has proposed a kind of loop antenna of amounting to; People such as Daniel M.Dobkin have proposed a kind of loop antenna by the lumped capacitor compensation of phase; The common feature of these antenna is to take to make someway the electric current on the ring to keep same-phase, and the magnetic field that induces like this is the strongest, but above-mentioned these antenna all belongs to resonant antenna, and phase compensation amount is relevant with frequency, so bandwidth is generally narrow.
Summary of the invention
In order to overcome the narrower deficiency of prior art bandwidth, the invention provides a kind of ultrahigh frequency band near field RFID reader-writer antenna.This antenna is a kind of traveling-wave antenna, and frequency band is than broad, and magnetic field is stronger.
The technical solution adopted for the present invention to solve the technical problems is: comprise coaxial fitting, PCB substrate, co-planar waveguide, Ba Lun and coplanar striplines, one end of the co-planar waveguide on coaxial fitting and the PCB substrate links to each other, the other end of co-planar waveguide is connected on the end of coplanar striplines by Ba Lun, the other end of coplanar striplines is connected to resistance, support by the nylon column that is positioned on four angles of PCB substrate between PCB substrate and the metal floor, between PCB substrate and metal floor, form an air layer.The parameter of the gap width between selection conduction band width, conduction band, dielectric constant, air layer thickness, Ba Lun impedance and the resistance value of PCB substrate makes impedance matching between co-planar waveguide, Ba Lun, coplanar striplines and the resistance.Reverse image current is arranged on the metal floor, and air layer is thick more, and reverse image current is far away more, and the near field is strong more.But air layer is thick more, and the size of antenna is big more.
The invention has the beneficial effects as follows: antenna of the present invention is a kind of traveling-wave structure, and frequency band compares broad; One air layer is arranged between PCB substrate and the metal floor, both reduced requirement, weakened the influence of metal floor retrodirective mirror image current again, so magnetic field is stronger to PCB substrate dielectric constant precision; This antenna is a kind of traveling-wave structure, and the length that changes antenna is little to performance change, so can design the antenna of different length easily according to the needs of different applications.
The present invention is further described below in conjunction with drawings and Examples.
Description of drawings
Fig. 1 is a ultrahigh frequency band near field RFID reader-writer antenna structural representation of the present invention.
Fig. 2 is the top view of Fig. 1.
Fig. 3 is the A-A cutaway view of Fig. 1.
Among the figure, 1, coaxial fitting, 2, co-planar waveguide, 3, Ba Lun, 4, coplanar striplines, 5, the PCB substrate, 6, resistance, 7, air layer, 8, metal floor, 9, nylon column.
Embodiment
With reference to Fig. 1～3, the present invention is made up of coaxial fitting 1, co-planar waveguide 2, Ba Lun 3, coplanar striplines 4, PCB substrate 5, resistance 6, air layer 7, metal floor 8 and nylon column 9.
Technology modes such as co-planar waveguide 2 and coplanar striplines 4 employing etchings are arranged on the upper surface of PCB substrate 5.The face down bonding that coaxial fitting 1 is close to PCB substrate 5 is connected on the co-planar waveguide 2.Ba Lun 3 is welded between co-planar waveguide 2 and the coplanar striplines 4.Resistance 6 is welded on the opposite side top of coplanar striplines 4.Support by the nylon column on four angles 9 between PCB substrate 5 and the metal floor 8, form an air layer 7 in the centre.
Embodiment one
The length of PCB substrate 5 and metal floor 8 and the size of width are 110mm and 50mm respectively; It is that 1.5mm, relative dielectric constant are 4.4 FR4 dielectric-slab that PCB substrate 5 adopts thickness; The thickness of air layer 7 is 5mm.
Select the center conduction band width and the gap width of co-planar waveguide 2, making its characteristic impedance is 50 Ω, so that and coaxial fitting 1 coupling.Adopt the Ba Lun of 1: 4 impedance ratio.Ba Lun 3 is 50 Ω in the port Impedance of co-planar waveguide 2 one sides, is 200 Ω in the port Impedance of coplanar striplines 4 one sides.The conduction band width of selecting coplanar striplines 4 is that the distance between 5mm and the conduction band is 10mm, and making its characteristic impedance is 200 Ω.The impedance of resistance 6 is the characteristic impedance coupling of 200 Ω and coplanar striplines 4.
From coaxial fitting 1, through co-planar waveguide 2, Ba Lun 3, coplanar striplines 4, until resistance 6, impedance is all mated.Therefore be a kind of traveling-wave structure, frequency band compares broad.
Opposite current on two conduction bands of coplanar striplines 4.The opposite electric current of direction can form the magnetic field perpendicular to PCB substrate 5 in the same way on two conduction bands between two conduction bands.
Because this antenna is a traveling-wave antenna, coplanar striplines 4 is a uniform transmission line, so can be according to the needs of different applications, change the length of coplanar striplines 4, other parameter constant is designed the antenna of different length, easily to obtain the different antenna zones of action.
Ba Lun 3 also can adopt other impedance ratio.Coplanar striplines 4 also can change the line of rabbet joint or parallel wire isoequilibrium transmission line into.PCB substrate 5 also can adopt other medium.
Embodiment two
The increase of the reduction of coplanar striplines 4 characteristic impedances and air layer 7 thickness all can increase magnetic field intensity, further expands the operating distance of antenna.
The length of PCB substrate 5 and metal floor 8 and the size of width are 110mm and 80mm respectively; It is that 1.5mm, relative dielectric constant are 4.4 FR4 dielectric-slab that PCB substrate 5 adopts thickness; The thickness of air layer 7 is 10mm.
Select the center conduction band width and the gap width of co-planar waveguide 2, making its characteristic impedance is 50 Ω, so that and coaxial fitting 1 coupling.Adopt the Ba Lun of 1: 2 impedance ratio.Ba Lun 3 is 50 Ω in the port Impedance of co-planar waveguide 2 one sides, is 100 Ω in the port Impedance of coplanar striplines 4 one sides.The conduction band width of selecting coplanar striplines 4 is that the distance between 35mm and the conduction band is 10mm, and making its characteristic impedance is 100 Ω.The impedance of resistance 6 is the characteristic impedance coupling of 100 Ω and coplanar striplines 4.From coaxial fitting 1, through co-planar waveguide 2, Ba Lun 3, coplanar striplines 4, until resistance 6, impedance is all mated.
Compare with embodiment one, in the present embodiment, the impedance of Ba Lun 3, coplanar striplines 4 and resistance 6 is all reduced to 100 Ω from 200 Ω.Because impedance reduces, then the electric current on the coplanar striplines 4 increases, so magnetic field strengthens.Compare with embodiment one, in the present embodiment, the thickness of air layer 7 is increased to 10mm from 5mm, the distance of retrodirective mirror image current has increased 10mm on the metal floor 8, so magnetic field strengthens.This antenna is under the situation of input power 1W, and operating distance is 5cm.Compare some increase of the antenna size of present embodiment with embodiment one.Among this embodiment, the operation principle of antenna is identical with embodiment one, repeats no more here.
Claims (1)
1. ultrahigh frequency band near field RFID reader-writer antenna, comprise coaxial fitting, PCB substrate, co-planar waveguide, Ba Lun and coplanar striplines, it is characterized in that: an end of the co-planar waveguide on coaxial fitting and the PCB substrate links to each other, the other end of co-planar waveguide is connected on the end of coplanar striplines by Ba Lun, the other end of coplanar striplines is connected to resistance, support by the nylon column that is positioned on four angles of PCB substrate between PCB substrate and the metal floor, between PCB substrate and metal floor, form an air layer; The parameter of the dielectric constant of the gap width between conduction band width, conduction band, PCB substrate, air layer thickness, Ba Lun impedance and resistance value so that between co-planar waveguide, Ba Lun, coplanar striplines and the resistance impedance matching be as the criterion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010221193.5A CN101916907B (en) | 2010-07-08 | 2010-07-08 | Ultrahigh frequency band near field RFID reader-writer antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010221193.5A CN101916907B (en) | 2010-07-08 | 2010-07-08 | Ultrahigh frequency band near field RFID reader-writer antenna |
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| Publication Number | Publication Date |
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| CN101916907A true CN101916907A (en) | 2010-12-15 |
| CN101916907B CN101916907B (en) | 2014-04-02 |
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| CN201010221193.5A Expired - Fee Related CN101916907B (en) | 2010-07-08 | 2010-07-08 | Ultrahigh frequency band near field RFID reader-writer antenna |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102299413A (en) * | 2011-06-02 | 2011-12-28 | 西北工业大学 | UHF (ultra high frequency) RFID (radio frequency identification) reader-writer antenna of smart shelf |
| CN102567775A (en) * | 2010-12-24 | 2012-07-11 | 刘智佳 | UHF_RFID (Ultra High Frequency-Radio Frequency Identification) tag of multi-dielectric structure and antenna |
| CN102820536A (en) * | 2012-08-22 | 2012-12-12 | 北京中欧美经济技术发展中心 | Ultra-high frequency (UHF) radio frequency identification (RFID) reader-writer antenna |
| CN103050778A (en) * | 2013-01-18 | 2013-04-17 | 北京邮电大学 | Radio frequency identification near-field antenna integrated with plane impedance matching balun |
| CN103746173A (en) * | 2013-12-27 | 2014-04-23 | 青岛中科软件股份有限公司 | 485MHz radio frequency module of on-board PCB antenna |
| CN105717466A (en) * | 2016-04-08 | 2016-06-29 | 北京航空航天大学 | Broadband minitype near field magnetic field measurement probe |
| CN105891611A (en) * | 2016-04-08 | 2016-08-24 | 北京航空航天大学 | Broadband miniature near-field electric field test probe |
| CN113300490A (en) * | 2017-05-12 | 2021-08-24 | 艾诺格思公司 | Near field antenna for accumulating energy at near field distance with minimal far field gain |
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| US6046704A (en) * | 1999-01-06 | 2000-04-04 | Marconi Aerospace Systems Inc. Advanced Systems Division | Stamp-and-bend double-tuned radiating elements and antennas |
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| TW201017977A (en) * | 2008-10-22 | 2010-05-01 | Sibeam Inc | A planar antenna |
| CN201758174U (en) * | 2010-07-08 | 2011-03-09 | 西北工业大学 | Ultra-high frequency range near field FRID reader-writer antenna |
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Patent Citations (5)
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| US6046704A (en) * | 1999-01-06 | 2000-04-04 | Marconi Aerospace Systems Inc. Advanced Systems Division | Stamp-and-bend double-tuned radiating elements and antennas |
| US20080272976A1 (en) * | 2006-02-23 | 2008-11-06 | Murata Manufacturing, Co., Ltd. | Antenna Device, Array Antenna, Multi-Sector Antenna, High-Frequency Wave Transceiver |
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| TW201017977A (en) * | 2008-10-22 | 2010-05-01 | Sibeam Inc | A planar antenna |
| CN201758174U (en) * | 2010-07-08 | 2011-03-09 | 西北工业大学 | Ultra-high frequency range near field FRID reader-writer antenna |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102567775A (en) * | 2010-12-24 | 2012-07-11 | 刘智佳 | UHF_RFID (Ultra High Frequency-Radio Frequency Identification) tag of multi-dielectric structure and antenna |
| CN102567775B (en) * | 2010-12-24 | 2016-06-08 | 上海曜传信息科技有限公司 | The UHF_RFID label of a kind of multimedium structure and antenna |
| CN102299413A (en) * | 2011-06-02 | 2011-12-28 | 西北工业大学 | UHF (ultra high frequency) RFID (radio frequency identification) reader-writer antenna of smart shelf |
| CN102820536B (en) * | 2012-08-22 | 2015-11-04 | 北京中欧美经济技术发展中心 | The radio frequency discrimination RFID reading and writing device antenna of hyperfrequency UHF |
| CN102820536A (en) * | 2012-08-22 | 2012-12-12 | 北京中欧美经济技术发展中心 | Ultra-high frequency (UHF) radio frequency identification (RFID) reader-writer antenna |
| CN103050778A (en) * | 2013-01-18 | 2013-04-17 | 北京邮电大学 | Radio frequency identification near-field antenna integrated with plane impedance matching balun |
| CN103050778B (en) * | 2013-01-18 | 2014-09-17 | 北京邮电大学 | Radio frequency identification near-field antenna integrated with plane impedance matching balun |
| CN103746173A (en) * | 2013-12-27 | 2014-04-23 | 青岛中科软件股份有限公司 | 485MHz radio frequency module of on-board PCB antenna |
| CN103746173B (en) * | 2013-12-27 | 2016-06-08 | 青岛中科软件股份有限公司 | Plate carries the 485MHz radio-frequency module of PCB antenna |
| CN105717466A (en) * | 2016-04-08 | 2016-06-29 | 北京航空航天大学 | Broadband minitype near field magnetic field measurement probe |
| CN105891611A (en) * | 2016-04-08 | 2016-08-24 | 北京航空航天大学 | Broadband miniature near-field electric field test probe |
| CN113300490A (en) * | 2017-05-12 | 2021-08-24 | 艾诺格思公司 | Near field antenna for accumulating energy at near field distance with minimal far field gain |
| CN113300490B (en) * | 2017-05-12 | 2024-04-05 | 艾诺格思公司 | Near field antenna for accumulating energy at near field distance with minimal far field gain |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101916907B (en) | 2014-04-02 |
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