CN105576354A - Near-field antenna for RFID system - Google Patents
Near-field antenna for RFID system Download PDFInfo
- Publication number
- CN105576354A CN105576354A CN201510976961.0A CN201510976961A CN105576354A CN 105576354 A CN105576354 A CN 105576354A CN 201510976961 A CN201510976961 A CN 201510976961A CN 105576354 A CN105576354 A CN 105576354A
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- CN
- China
- Prior art keywords
- antenna
- ring
- field antenna
- rfid system
- near field
- 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.)
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/42—Housings not intimately mechanically associated with radiating elements, e.g. radome
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
Abstract
The invention provides a near-field antenna for an RFID system. The near-field antenna comprises a substrate, a bottom shell and a connection feeder, wherein three concentric copper rings with different widths and radiuses are paved on a copper-paved radiation surface of the substrate; the copper ring with the maximal diameter is connected with a core wire of an N-type connector through the connection feeder; the substrate is fixed on the bottom shell through a positioning column at the bottom part; and an antenna cover is arranged on the bottom shell. The near-field antenna for the RFID system has the advantages that the form of a microstrip line with the concentric rings is adopted by the antenna, so that the near-field antenna is easy to process and high in efficiency; an aluminum shell at the lower part of a radiation panel can strengthen the antenna radiation intensity; and an upper shell right above the radiation panel is made of a PC (polycarbonate) material which does not affect radiation right above the antenna, so that the near-field antenna has high radiation intensity, high gain and stable performance.
Description
Technical field
The invention belongs to the communications field, especially relate to a kind of near field antenna for rfid system.
Background technology
Current radio frequency identification (RFID) industry development quickly, all starts to be widely used in multiple fields such as traffic, logistics, monitoring.Rfid system forms (with reference to rfid system figure: Fig. 1) by reading to know device, antenna and label.Read to know device by antenna transmission signal to label, label again reflected signal knows device antenna to reading, and forms a complete communication link.In communication process, the polarization mode due to label is linear polarization, so when reading to know the polarization mode that linear polarization also made by device antenna, such label just and can be read to know device antenna and mated very well, accurately identifies.In rfid system, read to know device antenna be divided into two kinds, one is far field antenna; This kind of antenna is used for remote transmission and reception label signal, and general Card Reader distance is more than 10 meters.One is also had to be near field antenna; Closely read for label, generally within 1 meter.Such as many labels closely read, and all need near field antenna to carry out communication to label when information reads and writes before label distribution.But existing near field antenna gain and field intensity are not fine, there will be blind spot within the scope of antenna near-field, thus how to design that a kind of gain is high, excellent performance, near-field field strength are comparatively strong, become without the near field antenna of blind spot the problem that those skilled in the art study in antenna near-field.
Summary of the invention
In view of this, the present invention be intended to propose that gain high, excellent performance, near-field field strength are comparatively strong, within the scope of antenna near-field without the near field antenna of blind spot.
For achieving the above object, technical scheme of the present invention is achieved in that
A kind of near field antenna for rfid system, comprise substrate, drain pan and connection feeder line, the paving copper radiation face of described substrate is equipped with the concentric copper ring of three different in width, different radii, the described copper ring of largest diameter is connected with the heart yearn of N Connector by described connection feeder line, described substrate is fixed on described drain pan by the reference column of bottom, and described drain pan is provided with radome.
Described drain pan is aluminium alloy drain pan.
Described radome is Merlon material.
Described substrate to be dielectric constant be 4.4 glass-epoxy material.
Described connection feeder line is silver-coated copper wire.
Described substrate size is 176mm*176mm*1.5mm.
The external diameter of large copper ring maximum on described radiating surface is 48-50mm, and the width of ring is 7-8mm, and the external diameter of second largest copper ring is 38-39mm, and the width of ring is 4-6mm, and the external diameter of little ring is 17-18mm, and the width of ring is 4-6mm.
The external diameter of large copper ring maximum on described radiating surface is 49mm, and the width of ring is 7.5mm, and the external diameter of second largest copper ring is 38.5mm, and the width of ring is 5mm, and the external diameter of little ring is 17.5mm, and the width of ring is 5mm.
Described connection feeder line adopts the connected mode of coaxial cable welding.
Relative to prior art, the near field antenna for rfid system of the present invention has following advantage: what this antenna adopted is the form of the microstrip line of three concentric rings, and easily process, production efficiency is high; Aluminium casing below radiant panel, can strengthen aerial radiation intensity; Upper casing directly over radiant panel adopts again PC (Merlon) material not affecting radiation directly over antenna, and therefore radiation intensity of the present invention is high, gain is high, stable performance.
Accompanying drawing explanation
The accompanying drawing forming a part of the present invention is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is rfid system figure;
Fig. 2 a is the feeding classification figure of circular loop antenna;
Fig. 2 b is the feeding classification figure of semicircular ring antenna;
Fig. 3 is the structural representation of inventive antenna plate;
Fig. 4 is inventive antenna overall diagram;
Fig. 5 is the end view of Fig. 4;
Fig. 6 is the field strength pattern of marching into the arena of antenna of the present invention;
Fig. 7 is the standing-wave ratio figure of antenna of the present invention.
In figure: 1. microstrip antenna, 2. substrate, 3. feeder line, 4. reference column, 5. radome, 6. drain pan.
Embodiment
It should be noted that, when not conflicting, the embodiment in the present invention and the feature in embodiment can combine mutually.
Below with reference to the accompanying drawings and describe the present invention in detail in conjunction with the embodiments.
First the principle of near field antenna is introduced:
Near field antenna, the near field characteristic of the antenna mainly utilized.The near-field region of antenna, is also called induction zone, can simply think in the structure inductance that the near-field energy of antenna is stored in antenna and structure capacitive.When two slave antennas are in the near-field region of the other side each other, and during mainly through magnetic energy (mutual inductance) coupled communication, this two slave antenna is called near field magnetic antenna.Loop antenna is modal one, and working mechanism is similar to transformer.
This near field antenna adopts the form of loop aerial, adds two the little concentric rings in the inside, due to the interaction of ring, causes the input impedance of loop antenna to be improved, can reach the impedance matching of 50 ohm, and can strengthen near-field field strength.Introduce a long coaxial feeder at distributing point place, impedance matching can be strengthened and increase coupling bandwidth.This antenna is 75-105 degree at theta angle, and phi angle is that within the scope of the primary radiation of-15-15 degree, field intensity reaches about 130V/m.
In theory, suppose at annulus
there is the some driving source of a voltage V at place, then the input impedance of ring
in actual applications, whole circle circular loop antenna uses balanced feeder feed (as parallel double-conductor transmission line) often, then similar to unipole antenna to half loop antenna, with coaxial feeding, as shown in Figure 2.Theoretic some driving source does not comprise the geometrical relationship details of distributing point, thus, and can not be directly equivalent with any one in these feed methods.But, with a driving source by formula
20 that get Fourier series, the CURRENT DISTRIBUTION calculated, input impedance and directional diagram and measured value are very consistent.Thus, this theoretical model is useful design tool.The distributing point of circular loop antenna is few, and structure is simple, and frequency band is wider.
Based on above-mentioned theory model, technical solution of the present invention is as follows: aerial radiation board size is 176*176*1mm, and the medium of employing is FR4 (4.4,0.02).On radiating surface, the external diameter of large ring is 49mm, and the width of ring is 7.5mm, and the external diameter of second largest ring is 38.5mm, and the width of ring is 5mm, and the external diameter of little ring is 17.5mm, and the width of ring is 5mm, and concentric ring adopts copper material.
As shown in Figure 1, this antenna is linear polarized antenna, comprise three different radiis, the donut of different in width, described substrate comprises the paving copper radiation face of upper surface and middle dielectric-slab (for double sided board), because the applying frequency of RFID is lower, therefore common FR4 (glass-epoxy) sheet material is adopted, the feed of antenna adopts silver-coated copper wire feeding classification, silver-coated copper wire is welded with the heart yearn of N Connector, N Connector and drain pan are connected by screw, and the ground wire of signal is fully contacted with drain pan.
Described connection feeder line adopts the connected mode of coaxial cable welding.The place's perforate of PCB solder joint, allows copper cash visit and goes down to ensure that the situation of rosin joint does not appear in tie point place.And separately open a hole nearby, allow copper cash stretch to fix.Earth point is connected with antenna back cover, result in formation of effective Signal transmissions.This feeder line, between antenna substrate and drain pan, this makes it possible to save space, reduces the height dimension of antenna.The pad of large encapsulation is preferably selected in the encapsulation of the surface mount elements that pcb board loads, and must with green oil.
What this antenna adopted is the form of microstrip line; Aluminium casing below radiant panel, can strengthen aerial radiation intensity; Upper casing directly over radiant panel adopts again the PC material not affecting radiation directly over antenna.
When debugging, when standing wave is bad, the radius of outer shroud should be changed, or change the position of lower long coaxial feeder.
When field intensity is imperfect time, change the position of lower second largest ring.Will try one's best firmly when welding, silver-coated copper wire can not loosen.Fixation wanted by screw on primary radiation face.
Housing distance antenna radiation unit 100mm At The Height field intensity value average is greater than 130v/m, is less than 1.2, meets design needs at regulation band limits standing internal wave ratio.
According to different frequency ranges, the concentric ring of different radii and width can be selected make.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. the near field antenna for rfid system, it is characterized in that: comprise substrate, drain pan and connection feeder line, the paving copper radiation face of described substrate is equipped with the concentric copper ring of three different in width, different radii, the described copper ring of largest diameter is connected with the heart yearn of N Connector by described connection feeder line, described substrate is fixed on described drain pan by the reference column of bottom, and described drain pan is provided with radome.
2. the near field antenna for rfid system according to claim 1, is characterized in that: described drain pan is aluminium alloy drain pan.
3. the near field antenna for rfid system according to claim 1, is characterized in that: described radome is Merlon material.
4. the near field antenna for rfid system according to claim 1, is characterized in that: described substrate to be dielectric constant be 4.4 glass-epoxy material.
5. the near field antenna for rfid system according to claim 1, is characterized in that: described connection feeder line is silver-coated copper wire.
6. the near field antenna for rfid system according to claim 1, is characterized in that: described substrate size is 176mm*176mm*1.5mm.
7. the near field antenna for rfid system according to any one of claim 1-6, it is characterized in that: the external diameter of large copper ring maximum on described radiating surface is 48-50mm, the width of ring is 7-8mm, the external diameter of second largest copper ring is 38-39mm, the width of ring is 4-6mm, the external diameter of little ring is 17-18mm, and the width of ring is 4-6mm.
8. the near field antenna for rfid system according to claim 7, it is characterized in that: the external diameter of large copper ring maximum on described radiating surface is 49mm, the width of ring is 7.5mm, the external diameter of second largest copper ring is 38.5mm, the width of ring is 5mm, the external diameter of little ring is 17.5mm, and the width of ring is 5mm.
9. the near field antenna for rfid system according to claim 1, is characterized in that: described connection feeder line adopts the connected mode of coaxial cable welding.
10. the near field antenna for rfid system according to claim 1, is characterized in that: described connection feeder line is located between described substrate and described drain pan.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510976961.0A CN105576354A (en) | 2015-12-21 | 2015-12-21 | Near-field antenna for RFID system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510976961.0A CN105576354A (en) | 2015-12-21 | 2015-12-21 | Near-field antenna for RFID system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105576354A true CN105576354A (en) | 2016-05-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510976961.0A Pending CN105576354A (en) | 2015-12-21 | 2015-12-21 | Near-field antenna for RFID system |
Country Status (1)
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| CN (1) | CN105576354A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106207379A (en) * | 2016-07-20 | 2016-12-07 | 周丹 | It is provided with the RFID electronic antenna label of encapsulation part |
| CN107069202A (en) * | 2017-03-30 | 2017-08-18 | 天津中兴智联科技有限公司 | A kind of near field antenna |
| WO2018014572A1 (en) * | 2016-07-20 | 2018-01-25 | 周丹 | Rfid electronic antenna tag |
| WO2018014573A1 (en) * | 2016-07-20 | 2018-01-25 | 周丹 | Rfid electronic antenna tag provided with parasitic radiation piece |
| CN108365321A (en) * | 2018-04-09 | 2018-08-03 | 天津中兴智联科技有限公司 | A kind of positioning antenna for RFID system |
| CN111211399A (en) * | 2020-03-04 | 2020-05-29 | 电子科技大学 | Metal-resistant ultrahigh frequency electronic tag antenna conformal to petroleum pipe sleeve wall |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090212953A1 (en) * | 2006-07-11 | 2009-08-27 | Martin Ross-Messemer | RFID-Transponder and device having an RFID-Transponder as well as a method of making an antenna for an RFID-Transponder |
| US20140035709A1 (en) * | 2011-04-11 | 2014-02-06 | Abb Technology Ag | Dry transformer heater |
| CN204391255U (en) * | 2015-02-16 | 2015-06-10 | 天津中兴智联科技有限公司 | For the reader antenna of rfid system |
| CN204741075U (en) * | 2015-06-29 | 2015-11-04 | 东莞捷荣技术股份有限公司 | Smart mobile phone and one coil adds NFC antenna of supplementary circle thereof |
| CN205335419U (en) * | 2015-12-21 | 2016-06-22 | 天津中兴智联科技有限公司 | A near field antenna for RFID system |
-
2015
- 2015-12-21 CN CN201510976961.0A patent/CN105576354A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090212953A1 (en) * | 2006-07-11 | 2009-08-27 | Martin Ross-Messemer | RFID-Transponder and device having an RFID-Transponder as well as a method of making an antenna for an RFID-Transponder |
| US20140035709A1 (en) * | 2011-04-11 | 2014-02-06 | Abb Technology Ag | Dry transformer heater |
| CN204391255U (en) * | 2015-02-16 | 2015-06-10 | 天津中兴智联科技有限公司 | For the reader antenna of rfid system |
| CN204741075U (en) * | 2015-06-29 | 2015-11-04 | 东莞捷荣技术股份有限公司 | Smart mobile phone and one coil adds NFC antenna of supplementary circle thereof |
| CN205335419U (en) * | 2015-12-21 | 2016-06-22 | 天津中兴智联科技有限公司 | A near field antenna for RFID system |
Non-Patent Citations (1)
| Title |
|---|
| 朱坤: "射频识别系统中近场天线的研究", 《万方数据库》 * |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106207379A (en) * | 2016-07-20 | 2016-12-07 | 周丹 | It is provided with the RFID electronic antenna label of encapsulation part |
| WO2018014572A1 (en) * | 2016-07-20 | 2018-01-25 | 周丹 | Rfid electronic antenna tag |
| WO2018014574A1 (en) * | 2016-07-20 | 2018-01-25 | 周丹 | Rfid electronic antenna label provided with encapsulation part |
| WO2018014573A1 (en) * | 2016-07-20 | 2018-01-25 | 周丹 | Rfid electronic antenna tag provided with parasitic radiation piece |
| CN107069202A (en) * | 2017-03-30 | 2017-08-18 | 天津中兴智联科技有限公司 | A kind of near field antenna |
| CN107069202B (en) * | 2017-03-30 | 2023-07-21 | 高新兴智联科技股份有限公司 | Near field antenna |
| CN108365321A (en) * | 2018-04-09 | 2018-08-03 | 天津中兴智联科技有限公司 | A kind of positioning antenna for RFID system |
| CN111211399A (en) * | 2020-03-04 | 2020-05-29 | 电子科技大学 | Metal-resistant ultrahigh frequency electronic tag antenna conformal to petroleum pipe sleeve wall |
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| PB01 | Publication | ||
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| WD01 | Invention patent application deemed withdrawn after publication | ||
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Application publication date: 20160511 |