CN103606735A - Near-field RFID (radio frequency identification) reader antenna for UHF (ultra high frequency) band - Google Patents
Near-field RFID (radio frequency identification) reader antenna for UHF (ultra high frequency) band Download PDFInfo
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- CN103606735A CN103606735A CN201310653865.3A CN201310653865A CN103606735A CN 103606735 A CN103606735 A CN 103606735A CN 201310653865 A CN201310653865 A CN 201310653865A CN 103606735 A CN103606735 A CN 103606735A
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Abstract
The invention discloses a near-field RFID (radio frequency identification) reader antenna for UHF (ultra high frequency) band. The near-field RFID reader antenna comprises a dielectric layer, wherein a first metal conduction band layer and a second metal conduction band layer which are parallel to each other are arranged above the dielectric layer; a slot line with adjustable width is formed between the first metal conduction band layer and the second metal conduction band layer. The reader antenna is simple in design structure, convenient to use, high in stability and long in reading distance and can be applied to different occasions.
Description
Technical field
The present invention relates to a kind of near field RFID reader antenna for uhf band.
Background technology
RFID (Radio Frequency Identification radio-frequency (RF) identification) system is a kind of communication technology, can identify specific objective and read and write related data by radio signals, and without setting up machinery between recognition system and specific objective or optics contacts.Conventional have technology such as low frequency (125k～134.2K), high frequency (13.56MHz), hyperfrequency (840MHz-960MHz) and microwave.
The basic functional principle of RFID technology is also uncomplicated, when label enters behind magnetic field, receive the radiofrequency signal that plug-in reader sends, the energy that relies on induced current to obtain sends out product information (the Passive Tag being stored in chip, passive label or passive label), or by label, initiatively sent the signal (Active Tag, active label or active tag) of a certain frequency, after plug-in reader reading information decoding, deliver to CIS and carry out relevant data processing.
A set of complete rfid system, by reader (Reader) and electronic tag (Tag), namely so-called transponder (Transponder) and three parts of application software system form, its operation principle is: the radio wave energy of Reader transmitting characteristic frequency is to Transponder, in order to drive Transponder circuit, inner data are sent, now Reader just sequentially receives unscrambling data, gives application program and does corresponding processing.
Shown in Fig. 1, it is the antenna of loop configuration conventional in prior art.This kind of antenna utilizes annular, the electric size of having dwindled antenna in this frequency range of UHF, and its overall dimensions is 180mm*180mm*1.5mm.Its general design that adopts separate type, the mode of utilizing inductance coupling high and phase place to lag behind, has guaranteed the single flow direction of electric current and has formed uniform field intensity, has overcome the near field inhomogeneities of traditional loop antenna, guarantees the stability that label reads.With model be in the reader uniting and adjustment test process of Impinj Speedway, can reach the label measuring distance of maximum 14cm.
But the antenna size of this structure can not be changed along with the difference of applicable situation.Because this antenna has substantially been determined overall dimensions in design process, and in a lot of application scenarios, we need the antenna of different size, preferably can adjust according to specific environment.Although this kind of antenna overall dimensions is less, can not reach this requirement, the environment therefore using is restricted.On the other hand, its design process is loaded down with trivial details.During due to this kind of Antenna Design, need to consider the adjusting of many structural parameters, just can reach the effect of overall impedance coupling.Need first the various structural parameters of this antenna to be carried out to theoretical analysis and calculation, re-use simulation software uniting and adjustment, this process need expends a large amount of time.
Except the antenna of said structure, another kind of reader antenna of the prior art is comprised of co-planar waveguide, coplanar stripline and multiple separated transmission line, the front portion of this antenna utilizes barron structure to reach the impedance matching of co-planar waveguide and coplanar stripline, and the load impedance of rear end transmission line is equal to the characteristic impedance of coplanar stripline through impedance matching process.Electromagnetic wave is propagated and radiation in dielectric-slab plane, forms uniform field intensity, thus reading tag.The length of antenna can regulate to meet the needs of different occasions, and the air layer between dielectric-slab and base plate can be used for expanding bandwidth, increases field intensity and reduce loss.But the shortcoming of this antenna is: it is little that it reads distance, and under identical test environment, the distance that reads of its maximum is only 5cm, many times can not meet the requirement of actual applicable situation.In addition, the antenna of this form, structure is comparatively complicated.In order to reach impedance matching, this kind of antenna need to be considered equally the impact of many structural parameters in design process, needs first these structural parameters first to be carried out to theoretical analysis and calculation, re-uses simulation software uniting and adjustment, and this process need to expend a large amount of time equally.
Summary of the invention
The defect that the present invention seeks to exist for prior art provides a kind of near field RFID reader antenna for uhf band.
The present invention for achieving the above object, adopt following technical scheme: a kind of near field RFID reader antenna for uhf band, comprise dielectric layer, the top of described dielectric layer is provided with the first metal guide belt and the second metal guide belt being parallel to each other, and between described the first metal guide belt and described the second metal guide belt, is formed with the broad-adjustable line of rabbet joint.
Further, described the first metal guide belt is mutually concordant with the both sides end face of the second metal guide belt and the both sides end face of described dielectric layer.
Beneficial effect of the present invention: the present invention adopts the near-field readers antenna of the electromagnetic leakage principle design of parallel wire, this antenna global design is simple in structure, easy to use, and stability is high, reads distance large, can apply to different occasions.
Accompanying drawing explanation
Fig. 1 is the structural representation of loop aerial of the prior art.
Fig. 2 is the structural representation of the front view of antenna of the present invention.
Fig. 3 is that the A-A of antenna in Fig. 2 is to structural representation.
Fig. 4 is the syndeton schematic diagram of antenna of the present invention and reader.
Embodiment
Shown in Fig. 2, Fig. 3, for a kind of near field RFID reader antenna for uhf band, comprise dielectric layer 1, the top of described dielectric layer 1 is provided with the first metal guide belt 2 and the second metal guide belt 4 being parallel to each other, and between described the first metal guide belt 2 and described the second metal guide belt 4, is formed with the broad-adjustable line of rabbet joint 3.Wherein, described the first metal guide belt 2 is mutually concordant with the both sides end face of the second metal guide belt 4 and the both sides end face of described dielectric layer 1.During use, as long as change the width of the line of rabbet joint 3, just can change the characteristic impedance of the line of rabbet joint 3.The transmission line of this structure can be used for, in the circuit such as high impedance line, series winding short-term and short circuit, also can be used in the combination of microwave integrated circuit and microstrip circuit.
By the adjusting ，Shi center feed to the line of rabbet joint 3 width, reach the impedance matching with the line of rabbet joint 3 ends, form uniform field intensity, and read the label of certain limit.
In addition, antenna structure size of the present invention can be designed to 500mm*120mm*1.5mm, utilizes the character of microstrip transmission line, makes its section very low, can combine and install and use with some equipment.In addition, the length of antenna of the present invention also can regulate, and can cut randomly, and its length is not subject to the restriction of 500mm, can apply to different application scenarios.
Antenna of the present invention uses the principle of two-wire line, utilizes its radiation field to carry out the design of UHF RFID near field antenna.Design process according to the difference of applicable situation, need the parameter of adjusting seldom, the resistance value that only need to regulate the length of two metal guide belts and relative spacing (being the width of the line of rabbet joint 3) and antenna end to mate, therefore designs very easy.
Transmission line theory is one of basic theories of understanding electromagnetic radiation, is applied to feeding network aspect more.The present invention directly applies to this theory the radiation of antenna, due to its radiation field a little less than, so can directly apply to the design of UHF RFID near field antenna.Utilize the method for transmission line electromagnetic exposure to carry out impedance matching, regulate reading distance, thereby reach designing requirement.
Shown in Fig. 4, be the syndeton schematic diagram of antenna of the present invention and reader, comprise reader 6, connect wire 5 and antenna of the present invention.Reader 6 is connected to the line of rabbet joint 3 medium positions of antenna of the present invention by connecting wire 4.Under this kind of test environment, the uniting and adjustment of electronic tag and reader 6 can reach the reading distance of 10cm, and from top to end stable performance, all can reach 10cm.
The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (2)
1. the near field RFID reader antenna for uhf band, it is characterized in that, comprise dielectric layer, the top of described dielectric layer is provided with the first metal guide belt and the second metal guide belt being parallel to each other, and between described the first metal guide belt and described the second metal guide belt, is formed with the broad-adjustable line of rabbet joint.
2. a kind of near field RFID reader antenna for uhf band as claimed in claim 1, is characterized in that, described the first metal guide belt is mutually concordant with the both sides end face of the second metal guide belt and the both sides end face of described dielectric layer.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310653865.3A CN103606735A (en) | 2013-12-09 | 2013-12-09 | Near-field RFID (radio frequency identification) reader antenna for UHF (ultra high frequency) band |
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| CN201310653865.3A CN103606735A (en) | 2013-12-09 | 2013-12-09 | Near-field RFID (radio frequency identification) reader antenna for UHF (ultra high frequency) band |
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| CN103606735A true CN103606735A (en) | 2014-02-26 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019179017A1 (en) * | 2018-03-19 | 2019-09-26 | 南京思追特电子科技有限公司 | Method for controlling tag identification range of ultra-high frequency near-field rfid system |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090289867A1 (en) * | 2008-05-26 | 2009-11-26 | Southern Taiwan University | Wideband printed dipole antenna for wireless applications |
| CN201689984U (en) * | 2010-04-07 | 2010-12-29 | 福建省光微电子科技有限公司 | Small-sized multilayer microstrip antenna convenient for debugging voltage standing wave ratio |
| KR20110006856A (en) * | 2009-07-15 | 2011-01-21 | 한국후지필름 주식회사 | Isotropic antenna |
| CN102112998A (en) * | 2008-08-01 | 2011-06-29 | 旭硝子株式会社 | RFID tag and its manufacturing method, impedance adjustment method, and resin sheet and its manufacturing method |
| US20120162001A1 (en) * | 2010-12-23 | 2012-06-28 | Electronics And Telecommunications Research Institute | Electromagnetic wave reverberation chamber |
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- 2013-12-09 CN CN201310653865.3A patent/CN103606735A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090289867A1 (en) * | 2008-05-26 | 2009-11-26 | Southern Taiwan University | Wideband printed dipole antenna for wireless applications |
| CN102112998A (en) * | 2008-08-01 | 2011-06-29 | 旭硝子株式会社 | RFID tag and its manufacturing method, impedance adjustment method, and resin sheet and its manufacturing method |
| KR20110006856A (en) * | 2009-07-15 | 2011-01-21 | 한국후지필름 주식회사 | Isotropic antenna |
| CN201689984U (en) * | 2010-04-07 | 2010-12-29 | 福建省光微电子科技有限公司 | Small-sized multilayer microstrip antenna convenient for debugging voltage standing wave ratio |
| US20120162001A1 (en) * | 2010-12-23 | 2012-06-28 | Electronics And Telecommunications Research Institute | Electromagnetic wave reverberation chamber |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019179017A1 (en) * | 2018-03-19 | 2019-09-26 | 南京思追特电子科技有限公司 | Method for controlling tag identification range of ultra-high frequency near-field rfid system |
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Application publication date: 20140226 |