CN203481377U - Near-field antenna for RFID tag reading and writing - Google Patents
Near-field antenna for RFID tag reading and writing Download PDFInfo
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- CN203481377U CN203481377U CN201320535771.1U CN201320535771U CN203481377U CN 203481377 U CN203481377 U CN 203481377U CN 201320535771 U CN201320535771 U CN 201320535771U CN 203481377 U CN203481377 U CN 203481377U
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Abstract
The utility model relates to a near-field antenna for RFID tag reading and writing. The near-field antenna comprises an antenna shell and a radiator arranged inside the antenna shell, wherein the radiator is coiled and placed from the edge to the center of the antenna shell or coiled and placed from the center to the edge of the antenna shell, turns of the coiled radiator are spaced from each other by a set distance, one end of the radiator is connected with a matching load, and the other end of the radiator is connected with a feed interface, used for feeding the antenna, of a radio frequency transmitting and receiving unit. The near-field antenna for RFID tag reading and writing has the following beneficial effects: RFID electronic tags within the range of 1/4 wavelength right in front of the antenna are ensured to be read and written and electronic tags beyond the range are not read or written; and meanwhile, the near-field antenna has the advantages of very small thickness, easy installation, simple structure, stable performance and low cost.
Description
Technical field
The utility model relates to antenna, more particularly, relates to a kind of near field antenna for the read-write of RFID label.
Background technology
Radio frequency identification (Radio Frequency Identification, be called for short RFID) technology has been widely used in logistics also and the numerous areas such as retail business, and it has effectively improved the efficiency of management, and has greatly saved human cost.REID has huge application potential in field of intelligent control, and in fields such as bookshelf management, file cabinet management and shelf managements, because article are many, article flow rate is high, cause management amount and large, the efficiency of management is low.The intelligent management system that carries out Real-Time Monitoring to article on frame arises at the historic moment, and this intelligent system is generally comprised of Sensor section and control terminal.Conventionally in article, pack electronic tag into, then by near field antenna reading tag, determine article state.Once any change occurs article state on frame, system can notify at once to manager, and this system can also realize the functions such as quick counting and fast finding in addition.This has improved greatly the efficiency of management and has reduced human cost.But the characteristic of electromagnetic field can cause sensing system can not take into account label reading success rate and read false rate (read system and originally should not read locational label) as a rule, be antenna reading tag success rate when high read false rate also increase, read false rate reads success rate after reducing and also decreases.This greatly reduces system effectiveness.In addition existing near field antenna also faces that volume is large, cost is high, antenna is difficult to the problems such as installation.
Utility model content
The technical problems to be solved in the utility model is, for prior art above-mentioned can not take into account label read success rate and read false rate, volume is large, cost is high, be difficult to the defect of installing, provide a kind of can take into account label read success rate and read false rate, volume is little, cost is low, the near field antenna for the read-write of RFID label being convenient to install.
The utility model solves the technical scheme that its technical problem adopts: construct a kind of near field antenna for the read-write of RFID label, comprise antenna casing and be arranged on the radiant body of described antenna casing inside, described radiant body by described antenna casing edge wherein cartridge around place or in described antenna casing its edge coiling of mind-set place; The distance of being separated by between the radiant body of described coiling and setting; Described radiant body one end is connected with matched load, and its other end is connected with the feeding interface that the radio frequency that is this antenna feed sends receiving element.
Further, described radiant body comprises inner wire, outer conductor and the insulator of coaxial setting, described insulator wraps up described inner wire, and described outer conductor is wrapped in described insulator outside surface according to the mode helically that leaves setting spacing between two adjacent spirals; The spiral that described outer conductor forms in a manner described covers whole insulator on its length direction.
Further, described inner wire one end is connected with the distributing point of described feeding interface, and the other end is connected to described load one end; Described outer conductor one end is connected with the earth point of described feeding interface, and the other end is connected with the other end of described load.
Further, described radiant body is respectively arranged with for making described radiant body be fixed on the fixture on described antenna casing near the two ends of described load and described feeding interface.
Further, the distance of described setting is less than the EFFECTIVE RANGE of described near field antenna.
Further, also comprise that described barricade is arranged on the one side of described antenna casing for shielding the barricade of a direction electromagenetic wave radiation, be positioned on described radiant body or under.
Further, described coiling place comprise by described antenna casing edge or described antenna casing center according to the interval of described setpoint distance spirally to described antenna casing center or described antenna casing edge place.
Further, described coiling place comprise by one end, described antenna casing edge according to the interval of described setpoint distance snakelike to the described antenna casing other end relative with described one end, place.
Further, described radiant body is the coaxial shielded cable that is provided with spiral radiating slot on outer conductor.
Further, described radiant body is remove outer conductor and on its insulating medium layer, use metal tape by the coaxial shielded cable of the spiral-shaped parcel in interval.
Implement the near field antenna for the read-write of RFID label of the present utility model, there is following beneficial effect: because it sends or receive electromagnetic wave by the radiant body being coiled in antenna casing, therefore, in this quarter-wave scope in antenna dead ahead, can guarantee to the reading of RFID electronic tag, for not reading in above-mentioned extraneous electronic tag; Meanwhile, owing to adopting radiant body to be coiled in the mode in antenna casing, this antenna thickness is very little, is easy to install, and makes simple, stable performance, with low cost.
Accompanying drawing explanation
Fig. 1 is that the utility model is for the structural representation of the near field antenna embodiment of RFID label read-write;
Fig. 2 is the structural representation of radiant body in described embodiment;
Fig. 3 is the another kind coiling mode schematic diagram of this antenna in described embodiment.
Embodiment
Below in conjunction with accompanying drawing, the utility model embodiment is described further.
As shown in Figure 1, at the near field antenna embodiment for the read-write of RFID label of the present utility model, this antenna, comprise antenna casing 5 and be arranged on the radiant body 1 of antenna casing 5 inside, radiant body 1 by described antenna casing 5 edges wherein cartridge around place or in antenna casing 5 its edge coiling of mind-set place; The distance of being separated by and setting between the radiant body 1 of coiling.It is worth mentioning that, in the present embodiment, the meaning of coiling is that the longer radiant body of length for example, is placed in antenna casing 5 according to certain rule (spirality or snakelike).That is to say, in the present embodiment, radiant body 1 is finished coaxial cable, and its width is far smaller than antenna casing 5, but its length is far longer than antenna casing 5.In the present embodiment.It is according to shape is repeated multiple times, radiant body 1 to be all arranged in this antenna casing 1 that this radiant body 1 is placed.During each arrangement, this section of this radiant body 1 this arrangement is not to be close to a section of arranging last time, but while arranging each time, the part (or the position of placing last time) of arranging capital and last time this radiant body 1 of placing separates certain distance places, and this distance is exactly the distance of setting; In the present embodiment, the distance of setting is less than the EFFECTIVE RANGE of this near field antenna.As shown in Figure 1, in the present embodiment, one end of radiant body 1 is connected with matched load 4, and the other end of radiant body 1 is connected with the feeding interface 3 that the radio frequency that is this antenna feed sends receiving element.
Refer to Fig. 2, Fig. 2 shows a kind of structure of radiant body 1 in the present embodiment.In Fig. 2, radiant body 1 comprises inner wire 8, outer conductor 6 and the insulator 7 of coaxial setting, inner wire 8 is in the position in this radiant body 1 bosom, insulator 7 parcel inner wires 8, outer conductor 6 is wrapped in insulator 7 outer surfaces according to the mode helically that leaves setting spacing 9 between two adjacent spirals; The spiral that outer conductor 6 forms in a manner described covers whole insulator 7 on its length direction.That is to say, outer conductor 6 has taked a kind of non-close-packed arrays (to refer between two spirals that outer conductor 6 forms on insulator 7, rather than refer between outer conductor 6 and insulator 7) mode be arranged on above-mentioned insulator 7, due to not contact between two spirals, and be provided with therebetween and set spacing 9, so this setting spacing 9 is also spiral.Once vicissitudinous electric current passes through on inner wire 8, the electromagnetic wave of its generation will be by above-mentioned spiral setting spacing 9 to surrounding radiation.Therefore, above-mentioned setting spacing 9 also can be called as radiating slot.In addition,, in order to guarantee above-mentioned radiant body 1 fixing on antenna casing 5, the two ends at radiant body 1 near matched load 4 and feeding interface 3 are respectively arranged with for making radiant body 1 be fixed on the fixture on antenna casing 5.For example, can clamp above-mentioned radiant body 1 and make it be fixed on clamping device on antenna casing 5 etc.
In the present embodiment, one end of inner wire 8 is connected with the distributing point (not shown) of feeding interface 3, and the other end of inner wire 8 is connected to one end of described matched load 4; One end of outer conductor 6 is connected with the earth point (not shown) of feeding interface 3, and the other end of outer conductor 6 is connected with the other end of matched load 4.In the present embodiment, generally, above-mentioned matched load 4 is a resistance normally, and it has two ends, for regulating the impedance matching of whole antenna and radio frequency part.The resistance of this resistance is normally fixed, for example 50 Europe etc.
In the present embodiment, in order to obtain the signal of an assigned direction, and avoid sending signal in unwanted direction or be subject to the signal interference in unwanted direction, this near field antenna can also comprise for shielding the barricade (not shown) of a direction electromagenetic wave radiation, barricade is arranged on the one side of antenna casing 5, be positioned on described radiant body or under.For being provided with the near field antenna of barricade, it can not send to electromagnetic wave the direction (being that electromagnetic wave can not pass this barricade) at barricade place, and meanwhile, the electromagnetic signal that the party makes progress can be by this antenna reception yet.
In the present embodiment, radiant body 1 coiling is placed and can according to the interval of setpoint distance, spirally to the center of antenna casing 5, be placed by antenna casing 5 edges, also can according to the interval of setpoint distance, spirally to the edge of antenna casing 5, be placed by the center of antenna casing 5.Refer to the arrangement mode shown in Fig. 1.Now, the shape of this antenna casing 5 regular polygon normally.In addition, under certain situation in the present embodiment, for example, and when the shape of above-mentioned antenna casing 5 is rectangle, also can be along the above-mentioned radiant body 1 of its long snakelike arrangement in limit; By antenna casing 5 one end, edge according to the interval of described setpoint distance snakelike to antenna casing 5 other end relative with described one end, place, the mode of this arrangement is indicated in Fig. 2.
As previously mentioned, it is a coaxial cable through processing that radiant body 1 can be considered as substantially, and in the present embodiment, in a kind of situation, radiant body 1 is the coaxial shielded cable that is provided with spiral radiating slot (setting spacing 9) on outer conductor.And in another case, radiant body 1 is remove outer conductor and use metal tape by the coaxial shielded cable of the spiral-shaped parcel in interval on its insulating medium layer.
In a word, on the outer conductor 6 of coaxial shielded cable, have spirality radiating slot.Radiant body 1 coiling is fixed in antenna casing 5 and is formed antenna.Spirality radiating slot (setting spacing 9) can directly be slotted and form on the outer conductor 7 of coaxial shielded cable, by adjusting its fluting density (setting the size of spacing), adjusts closely reading performance of antenna.Or directly with rectangular metal band gap between screw parcel coaxial shielded cable insulating medium layer 7, form helicla flute 9, by adjusting rectangular metal bandwidth and gap width, adjust closely reading performance of antenna.
Because radiating principal 1 is formed by coaxial shielded cable coiling, be then packaged in antenna casing, with respect to traditional antenna, there is lower cost.The radiating slot of coaxial shielded cable adopts spiral-shaped slits 9, and its radiation efficiency, higher than existing near field antenna, is more suitable for RFID near field and covers.Feeding interface 3 and matched load 4 are connected to respectively the two ends of coaxial shielded cable, and the two position can be changed according to the actual requirements flexibly.
In the present embodiment, the helicla flute 9 of opening width on the general 50 ohm coaxial cable outer conductors 6 that actual example is is 4.5mm at diameter and the be 1.5mm wherein distance between two grooves is 3mm, thereby forms leakage coaxial cable (namely radiant body 1).Afterwards its one end is fixed on to the center of the antenna casing 5 that is of a size of 20cmx20cmx1cm, coaxial leaky cable coiling is fixed in antenna casing 5, during coiling, for guaranteeing evenly reading of antenna footprint, the spacing between two sections of antennas is not more than antenna in the maximum read distance in dead ahead.Be fixed on a termination matched load 4 at antenna casing 5 centers, another termination radio frequency (RF) coaxial connector (being feeding interface 3).This antenna can be used as RFID card sender in actual applications, and the scanning antenna of closely making an inventory uses.
In the present embodiment; another actual example is that the external protection of super soft 50 ohm of radio frequency coaxial-cables of diameter 10mm and coaxial outer conductor 6 are peelled off, thereby the rectangular metal band interval 0.8cm that is then 1cm with width wraps up coaxial line insulating medium layer 7 in the shape of a spiral, forms (namely radiant body 1).Wherein can regulate according to the actual requirements rectangular metal bandwidth and metal tape spacing distance regulate antenna read distance and standing-wave ratio.Afterwards its one end is fixed on to an edge of the antenna casing 5 of 30cmx150cmx1.5cm, coaxial leaky cable coiling is fixed in antenna casing 5, distance during coiling between two sections of lines is not more than antenna maximum read distance.At cable two ends, connect respectively load 4 and radio frequency (RF) coaxial connector 3.In some special applications, for guaranteeing the rear to radiationless of antenna, can on face of antenna, lay the metal screen layer of 30cmx150cmx0.1cm, during use using the one side that is covered with metal level as the antenna back side.This antenna can directly be placed on shelf in actual applications, thereby realizes the application of making an inventory with locating of goods.The feature of this example is cheap, installs simple.Can in Internet of Things shelf management, lay on a large scale.
The above embodiment has only expressed several execution mode of the present utility model, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the utility model the scope of the claims.It should be pointed out that for the person of ordinary skill of the art, without departing from the concept of the premise utility, can also make some distortion and improvement, these all belong to protection range of the present utility model.Therefore, the protection range of the utility model patent should be as the criterion with claims.
Claims (10)
1. the near field antenna for RFID label read-write, it is characterized in that, comprise antenna casing and be arranged on the radiant body of described antenna casing inside, described radiant body by described antenna casing edge wherein cartridge around place or in described antenna casing its edge coiling of mind-set place; The distance of being separated by between the radiant body of described coiling and setting; Described radiant body one end is connected with matched load, and its other end is connected with the feeding interface that the radio frequency that is this antenna feed sends receiving element.
2. the near field antenna for RFID label read-write according to claim 1, it is characterized in that, described radiant body comprises inner wire, outer conductor and the insulator of coaxial setting, described insulator wraps up described inner wire, and described outer conductor is wrapped in described insulator outside surface according to the mode helically that leaves setting spacing between two adjacent spirals; The spiral that described outer conductor forms in a manner described covers whole insulator on its length direction.
3. the near field antenna for the read-write of RFID label according to claim 2, is characterized in that, described inner wire one end is connected with the distributing point of described feeding interface, and the other end is connected to described load one end; Described outer conductor one end is connected with the earth point of described feeding interface, and the other end is connected with the other end of described load.
4. the near field antenna for the read-write of RFID label according to claim 3, is characterized in that, described radiant body is respectively arranged with for making described radiant body be fixed on the fixture on described antenna casing near the two ends of described load and described feeding interface.
5. the near field antenna for the read-write of RFID label according to claim 4, is characterized in that, the distance of described setting is less than the EFFECTIVE RANGE of described near field antenna.
6. the near field antenna for RFID label read-write according to claim 5, it is characterized in that, also comprise that described barricade is arranged on the one side of described antenna casing for shielding the barricade of a direction electromagenetic wave radiation, be positioned on described radiant body or under.
7. the near field antenna for RFID label read-write according to claim 6, it is characterized in that, described coiling place comprise by described antenna casing edge or described antenna casing center according to the interval of described setpoint distance spirally to described antenna casing center or described antenna casing edge place.
8. the near field antenna for RFID label read-write according to claim 6, it is characterized in that, described coiling place comprise by one end, described antenna casing edge according to the interval of described setpoint distance snakelike to the described antenna casing other end relative with described one end, place.
9. the near field antenna for the read-write of RFID label according to claim 6, is characterized in that, described radiant body is the coaxial shielded cable that is provided with spiral radiating slot on outer conductor.
10. the near field antenna for the read-write of RFID label according to claim 6, is characterized in that, described radiant body is remove outer conductor and on its insulating medium layer, use metal tape by the coaxial shielded cable of the spiral-shaped parcel in interval.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320535771.1U CN203481377U (en) | 2013-08-30 | 2013-08-30 | Near-field antenna for RFID tag reading and writing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320535771.1U CN203481377U (en) | 2013-08-30 | 2013-08-30 | Near-field antenna for RFID tag reading and writing |
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| Publication Number | Publication Date |
|---|---|
| CN203481377U true CN203481377U (en) | 2014-03-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201320535771.1U Expired - Fee Related CN203481377U (en) | 2013-08-30 | 2013-08-30 | Near-field antenna for RFID tag reading and writing |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105609949A (en) * | 2016-03-18 | 2016-05-25 | 联想(北京)有限公司 | Electronic equipment |
| CN106486783A (en) * | 2016-11-30 | 2017-03-08 | 中国科学技术大学 | The new leakage cable of internet of things oriented application |
| CN110458275A (en) * | 2019-09-11 | 2019-11-15 | 欧科华创自动化(深圳)有限公司 | A kind of anti-string reading transmitting antenna for electronic tag |
| CN111492379A (en) * | 2017-12-25 | 2020-08-04 | 京瓷株式会社 | Substrate for RFID tag, and RFID system |
| CN112417905A (en) * | 2019-08-23 | 2021-02-26 | 菜鸟智能物流控股有限公司 | Radio frequency tag identification system and method |
-
2013
- 2013-08-30 CN CN201320535771.1U patent/CN203481377U/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105609949A (en) * | 2016-03-18 | 2016-05-25 | 联想(北京)有限公司 | Electronic equipment |
| CN105609949B (en) * | 2016-03-18 | 2018-08-10 | 联想(北京)有限公司 | A kind of electronic equipment |
| CN106486783A (en) * | 2016-11-30 | 2017-03-08 | 中国科学技术大学 | The new leakage cable of internet of things oriented application |
| CN106486783B (en) * | 2016-11-30 | 2019-06-11 | 中国科学技术大学 | The novel leakage cable of internet of things oriented application |
| CN111492379A (en) * | 2017-12-25 | 2020-08-04 | 京瓷株式会社 | Substrate for RFID tag, and RFID system |
| CN111492379B (en) * | 2017-12-25 | 2023-10-24 | 京瓷株式会社 | Substrate for RFID tag, and RFID system |
| CN112417905A (en) * | 2019-08-23 | 2021-02-26 | 菜鸟智能物流控股有限公司 | Radio frequency tag identification system and method |
| CN112417905B (en) * | 2019-08-23 | 2024-04-02 | 菜鸟智能物流控股有限公司 | Radio frequency tag identification system and method |
| CN110458275A (en) * | 2019-09-11 | 2019-11-15 | 欧科华创自动化(深圳)有限公司 | A kind of anti-string reading transmitting antenna for electronic tag |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140312 Termination date: 20190830 |
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| CF01 | Termination of patent right due to non-payment of annual fee |