CN101763498A - Area control circuit for passive ultra high frequency radio frequency identification - Google Patents
Area control circuit for passive ultra high frequency radio frequency identification Download PDFInfo
- Publication number
- CN101763498A CN101763498A CN200910216404A CN200910216404A CN101763498A CN 101763498 A CN101763498 A CN 101763498A CN 200910216404 A CN200910216404 A CN 200910216404A CN 200910216404 A CN200910216404 A CN 200910216404A CN 101763498 A CN101763498 A CN 101763498A
- Authority
- CN
- China
- Prior art keywords
- signal
- reader
- antenna
- control circuit
- port
- 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.)
- Pending
Links
Images
Landscapes
- Near-Field Transmission Systems (AREA)
Abstract
The invention relates to an area control circuit for passive ultra high frequency radio frequency identification, which comprises a reader comprising a signal transmission port and a signal receive port, and the signal transmission port and the signal receive port are respectively connected with an antenna. The area control circuit is characterized in that a variable signal attenuator is connected between the antenna and the signal receive port in series. The scheme of the invention does not take the adjusting of the transmitted power of the reader as a main means, ensures that the electromagnetic wave radiation intensity in a reading area can reliably activate passive tags, and meets general conditions of the reliable reading of the reading area; and a signal attenuation network is added at the receive port, and actually processes the back-scattering modulating signal of the tag and the answer signal of the passive tag. The invention can scientifically and simply carry out the scheme, has low cost, does not add the work load of systematic application software, does not carry out large-scale reformation on system devices, can lead a radio frequency identification device to realize exact identification within a given zone distance.
Description
Technical field
The invention belongs to the technical field of radio-frequency (RF) identification, relate in particular to a kind of accurately area control circuit of identification of in controllable distance, realizing.
Background technology
Passive ultra-high frequency (840MHz～960MHz) compare with passive high frequency (13.56MHz) RFID technology, has the distance of reading, the advantage that reading speed is fast by radio-frequency (RF) identification (RFID, Radio FrequencyIdentification) technology.In the passive ultra-high frequency RFID The Application of Technology, usually relate to personnel, the reliable accurate recognition of article, the Region control technology of tag recognition is the important fundamental of reliable recognition, Region control simply is exactly, effective coverage, the space scope of clearer and more definite delimitation recognition label, in the useful space, identification label, exceed the zone, the nonrecognition label.Existing Region control technology generally adopts the control of reader emissive power, cooperates Antenna Design and antenna arrangement to realize.Owing to be the passive ultra-high frequency RFID technology, passive label is discerned, at first needing reliably in the identified region, this frequency range electromagnetic wave covers, guarantee that passive label obtains enough energy to be activated, so just can produce response to the operational order of reader, reader also needs certain receiving sensitivity in addition, guarantees the backscatter modulation signal of the label of demodulation reliably in the recognition zone.Prior art is regulated emission power of reader by adjusting, electromagnetic energy size in the control area, perhaps arrange antenna bearingt simultaneously, make antenna radiation pattern satisfy the overlay area, space, reach the purpose of Region control, this can embody certain Region control effect under the perfect condition of laboratory, but under the practical application scene, circumstance complication usually faces the reflection of metal on every side, cause the control area distortion, even change the directional diagram of antenna.
In addition, control decipherment distance by reducing emission power of reader, in the design process of reader, can be guaranteed reliably, can accomplish meticulous adjustable, but when adjustment power satisfies the Region control requirement, usually sacrificed the electromagnetic wave energy size in the recognition zone, and the encapsulation technology of label and production run can't guarantee the consistency of performance of label, cause the part label in the identified region, under less electromagnetic energy, can not normally be activated, also just can't reliable recognition, cause skip, Region control has also lost meaning.And strengthen the boundary that emissive power can be broken the recognition zone, cause and misread.
Summary of the invention
The objective of the invention is for a kind of area control circuit of passive ultra-high frequency radio-frequency (RF) identification is provided, can make radio frequency identification equipment in given region distance, realize accurately identification.
To achieve these goals, the present invention has adopted following technical scheme: a kind of area control circuit of passive ultra-high frequency radio-frequency (RF) identification, comprise reader, described reader comprises a signal emission port and receiver port, the signal emission port is connected with antenna respectively with receiver port, it is characterized in that, between described antenna and receiver port, be in series with a variable signal attenuator.
Described signal attenuator is become with three adjustable resistor group by two radio frequency connectors, and three adjustable resistances are according to being T type, ∏ type or bridge T type structural arrangement, and two radio frequency connectors couple together adjustable resistance respectively with antenna and receiver port.
Described antenna is two groups of independently antennas, is connected with receiver port with the signal emission port of reader respectively.
Described antenna is one group of antenna, and the signal emission port by circulator and reader is connected with receiver port.
The solution of the present invention is not main means to adjust emission power of reader, has guaranteed that electromagnetic wave radiant intensity can activate passive label reliably in the recognition zone, satisfies the pacing items that reliably read in the recognition zone; Increase the signal attenuation network at receiving end, be actually backscatter modulation signal, and the answer signal of passive label processes label.It is simple, with low cost that the solution of the present invention is implemented science, do not increase the workload of system software, also do not carry out the transformation of large scale system equipment, just can make radio frequency identification equipment realize accurately identification in given region distance.
Description of drawings
Fig. 1 is the electrical block diagram of the embodiment of the invention 1.
Fig. 2 is the electrical block diagram of the embodiment of the invention 2.
Fig. 3 is the T type structural representation of signal attenuator of the present invention.
Fig. 4 is the bridge T type structural representation of signal attenuator of the present invention.
Fig. 5 is the electrical block diagram of the embodiment of the invention 5.
Fig. 6 is the electrical block diagram of the embodiment of the invention 6.
Embodiment
Principle of work of the present invention is not main means to adjust emission power of reader, has guaranteed that electromagnetic wave radiant intensity can activate passive label reliably in the recognition zone, satisfies the pacing items that reliably read in the recognition zone; Increase the signal attenuation network at receiving end, be actually backscatter modulation signal to label, and the answer signal of passive label processes, the answer signal of label is with form of electromagnetic wave, feed back to the receiving antenna of reader, arrive the receiver port of reader then, electromagnetic energy and wavelength are the key factors that influences transmission range, from emissive source, electromagnetic energy that is to say the backscattered modulation signal of label, along with the distance from reader antenna is far away more weak more along with the decay of transmission range exponentially, below the receiving sensitivity index of Signal-to-Noise at reader, label can't correctly maybe can't be discerned.The invention that we the did this science thinking that has been exactly of equal value recovery (realization), adjustable attenuation network is according to the physical condition of application scenarios, signal to tag feedback carries out certain decay, be equivalent to the extra-regional label signal of recognition is attenuated under the identification intensity of reader, reach the outer purpose of not reading in zone, though the label signal in the recognition zone also is attenuated on the other hand, signal intensity still remains on reader can discern, and finishes the reliable recognition of label.
The receiving sensitivity of reader is the important indicator of reader design, can not need because of Region control, reduces the performance index of reader itself, can cause the label in the recognition zone to be discerned reliably like this.
The signal emission port of reader connects the outside radiation power of emitting antenna and activates label, and receiving antenna receives the answer signal of label and is input to the receiver port of reader through a variable signal attenuator.System does not need identified region the answer signal of the label discerned to decay to below the discernible signal intensity of reader (receiving sensitivity) outward by the damping capacity of adjusting variable signal attenuator, though and the answer signal that needs the label discerned in the identified region is through overdamping but still on the discernible signal intensity of reader (receiving sensitivity), thereby reach the purpose of identified region control.
The invention will be further described below in conjunction with the drawings and specific embodiments.
Embodiment 1: as shown in Figure 1, a kind of area control circuit of passive ultra-high frequency radio-frequency (RF) identification, comprise reader, described reader comprises a signal emission port (TX) and receiver port (RX), signal emission port (TX) is connected with receiving antenna with emitting antenna respectively with receiver port (RX), is in series with a variable signal attenuator between described receiving antenna and receiver port.Signal attenuator is made up of two radio frequency connectors and three adjustable resistances (R1, R2, R2), and three adjustable resistances are according to being ∏ type structural arrangement, and two radio frequency connectors couple together adjustable resistance respectively with antenna and receiver port.
Three adjustable resistances of above-mentioned signal attenuator can also be according to T type or bridge T type structural arrangement structural arrangement, as Fig. 3 and Fig. 4.
Embodiment 2: as shown in Figure 2, a kind of area control circuit of passive ultra-high frequency radio-frequency (RF) identification, comprise reader, described reader comprises a signal emission port (TX) and receiver port (RX), signal emission port (TX) directly is connected with antenna by circulator, receiver port (RX) is connected with antenna with circulator by signal attenuator, so, the shared antenna of signal emission port (TX) and receiver port (RX), this antenna plays emitting antenna and receiving antenna simultaneously.The concrete structure of signal attenuator can adopt the structure identical with embodiment 1.
During practical application, determine that at first identified region is such as 5 meters decipherment distance, one label is placed the position in 5 meters in dual-mode antenna the place ahead, when signal attenuator is not decayed to the answer signal of label, this label is discernible, the damping capacity that adjust signal attenuator this moment makes reader can not discern this label, and the identified region of the damping capacity correspondence of attenuator is exactly 5 meters so at this moment.
Those of ordinary skill in the art will appreciate that embodiment described here is in order to help reader understanding's principle of the present invention, should to be understood that protection scope of the present invention is not limited to such special statement and embodiment.Everyly make various possible being equal to according to foregoing description and replace or change, all be considered to belong to the protection domain of claim of the present invention.
Claims (4)
1. the area control circuit of a passive ultra-high frequency radio-frequency (RF) identification, comprise reader, described reader comprises a signal emission port and receiver port, the signal emission port is connected with antenna respectively with receiver port, it is characterized in that, between described antenna and receiver port, be in series with a variable signal attenuator.
2. the area control circuit of a kind of passive ultra-high frequency radio-frequency (RF) identification according to claim 1, it is characterized in that, described signal attenuator is become with three adjustable resistor group by two radio frequency connectors, three adjustable resistances are according to being T type, ∏ type or bridge T type structural arrangement, and two radio frequency connectors couple together adjustable resistance respectively with antenna and receiver port.
3. the area control circuit of a kind of passive ultra-high frequency radio-frequency (RF) identification according to claim 1 is characterized in that, described antenna is two groups of independently antennas, is connected with receiver port with the signal emission port of reader respectively.
4. the area control circuit of a kind of passive ultra-high frequency radio-frequency (RF) identification according to claim 1 is characterized in that, described antenna is one group of antenna, and the signal emission port by circulator and reader is connected with receiver port.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910216404A CN101763498A (en) | 2009-11-27 | 2009-11-27 | Area control circuit for passive ultra high frequency radio frequency identification |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910216404A CN101763498A (en) | 2009-11-27 | 2009-11-27 | Area control circuit for passive ultra high frequency radio frequency identification |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101763498A true CN101763498A (en) | 2010-06-30 |
Family
ID=42494655
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910216404A Pending CN101763498A (en) | 2009-11-27 | 2009-11-27 | Area control circuit for passive ultra high frequency radio frequency identification |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101763498A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102262739A (en) * | 2011-07-21 | 2011-11-30 | 苏州中科集成电路设计中心有限公司 | Radio frequency identification (RFID) reader structure |
| CN106869817A (en) * | 2017-04-13 | 2017-06-20 | 长江大学 | A kind of deep-sea test string connector |
| US20180248270A1 (en) * | 2017-02-28 | 2018-08-30 | Huawei Technologies Co., Ltd. | Antenna and communications device |
| CN109101853A (en) * | 2018-07-30 | 2018-12-28 | 成都九洲电子信息系统股份有限公司 | A kind of radio-frequency identification reader/writer system protection and antenna port detection system |
| CN109614832A (en) * | 2018-11-20 | 2019-04-12 | 深圳市航天华拓科技有限公司 | Radio-frequency identification reader card reading method, device and computer readable storage medium |
| CN110647777A (en) * | 2019-09-18 | 2020-01-03 | 深圳盈达机器视觉技术有限公司 | Radio frequency identification reader and application method thereof |
-
2009
- 2009-11-27 CN CN200910216404A patent/CN101763498A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102262739A (en) * | 2011-07-21 | 2011-11-30 | 苏州中科集成电路设计中心有限公司 | Radio frequency identification (RFID) reader structure |
| CN102262739B (en) * | 2011-07-21 | 2013-11-27 | 苏州中科集成电路设计中心有限公司 | Radio frequency identification (RFID) reader structure |
| US20180248270A1 (en) * | 2017-02-28 | 2018-08-30 | Huawei Technologies Co., Ltd. | Antenna and communications device |
| US10693240B2 (en) * | 2017-02-28 | 2020-06-23 | Huawei Technologies Co., Ltd. | Antenna and communications device |
| CN106869817A (en) * | 2017-04-13 | 2017-06-20 | 长江大学 | A kind of deep-sea test string connector |
| CN109101853A (en) * | 2018-07-30 | 2018-12-28 | 成都九洲电子信息系统股份有限公司 | A kind of radio-frequency identification reader/writer system protection and antenna port detection system |
| CN109101853B (en) * | 2018-07-30 | 2021-07-27 | 成都九洲电子信息系统股份有限公司 | Radio frequency identification reader-writer system protection and antenna port detection system |
| CN109614832A (en) * | 2018-11-20 | 2019-04-12 | 深圳市航天华拓科技有限公司 | Radio-frequency identification reader card reading method, device and computer readable storage medium |
| CN109614832B (en) * | 2018-11-20 | 2022-02-18 | 深圳市航天华拓科技有限公司 | Card reading method and device of radio frequency identification reader and computer readable storage medium |
| CN110647777A (en) * | 2019-09-18 | 2020-01-03 | 深圳盈达机器视觉技术有限公司 | Radio frequency identification reader and application method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101233700B (en) | RFID reader and RFID system | |
| CN101763498A (en) | Area control circuit for passive ultra high frequency radio frequency identification | |
| CN102017438A (en) | Radio frequency communication device and method for operating the same | |
| CN102609738A (en) | RFID (radio frequency identification device) multi-antenna reader-writer | |
| CN103198283A (en) | Harmonic radio frequency identification system | |
| CN103020562A (en) | Ultrahigh frequency radio frequency identification device (RFID) self-adaptive antenna impedance matching method | |
| CN102332634A (en) | Dual-mode antenna for radio frequency identification and radio frequency identification device | |
| CN102565582A (en) | Test device of radio frequency identification equipment | |
| CN104392262A (en) | Novel data label and data reading-writing system and method of data label | |
| CN104360199A (en) | Ultrahigh-frequency-band RFID testing system | |
| CN201548966U (en) | Zone control device for radio frequency recognition | |
| CN102254132B (en) | Rfid reader | |
| CN106199296B (en) | Method for rapidly testing frequency response characteristic of RFID (radio frequency identification) tag | |
| CN104732254A (en) | Radio frequency identification reader and writer | |
| CN102902939B (en) | Carrier cancellation device | |
| CN103235962B (en) | A kind of elimination launches the super high frequency electronic label read/write disturbed | |
| US8416060B2 (en) | Method and device for reading radio frequency identification (RFID) tags | |
| CN204189947U (en) | Loop feed label antenna | |
| CN106127091A (en) | A kind of intelligent UHFRFID reader based on DSP | |
| CN204302407U (en) | A kind of super high band RFID test macro | |
| CN102024174A (en) | Radio frequency identification (RFID) tag chip and RFID tag | |
| CN102982297B (en) | Label test system | |
| KR100836469B1 (en) | Rfid reader and rfid system | |
| CN203386224U (en) | Single-frequency and double-chip all-purpose card | |
| CN201993781U (en) | Ultrahigh frequency radio frequency identification reader-writer module |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20100630 |