CN203930845U - Many antennas radio-frequency recognition system for double-frequency electronic label - Google Patents
Many antennas radio-frequency recognition system for double-frequency electronic label Download PDFInfo
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Abstract
The utility model discloses many antennas radio-frequency recognition system for a kind of double-frequency electronic label, comprises antenna activation of source, dual-band radio frequency electronic tag and card reader; Antenna activation of source, comprising: storer, for depositing each low-frequency antenna ID coding and antenna activation of source ID coding; Low frequency radio frequency circuit and several low-frequency antennas being connected with low frequency radio frequency circuit; Power control circuit between low frequency radio frequency circuit and governor circuit, this power control circuit is used for regulating low-frequency antenna emissive power; The first thin code switch, this first thin code switch one end is connected to described governor circuit, and the other end is connected to for the second thin code switch, RS485 communicating circuit and the high frequency wireless module of mode of operation are set; Governor circuit; Described dual-band radio frequency electronic tag, comprising: low frequency receiving antenna, low-frequency channel, high-frequency circuit, high frequency antenna.The utility model has increased the coverage of low frequency signal, improves the stability of low frequency signal, solves the interference problem between each antenna, can realize accurate location, decipherment distance is adjustable.
Description
Technical field
The present invention relates to radio frequency identification field, relate in particular to many antennas radio-frequency recognition system for a kind of double-frequency electronic label.
Background technology
In recent years, Internet of Things is a new technology of people's common concern, and REID has obtained development rapidly as a gordian technique of Internet of Things.The management of the complex environments such as community, mining area, highway is subject to the great attention of national departments concerned always, but the dispute causing due to negligent supervision even accident still occur repeatedly, cause the unnecessary loss of a lot of individuals and national interests.Strengthening managing measure how, how the Efficient Operation of Nei Feiben community, accurate, real-time, fast grasp residential quarter personnel state, mining area personnel's distribution and mobility status, highway toll efficiency and burst accident rescue is national departments concerned problem in the urgent need to address.Change the management mode falling behind, the modernization, the informationization that realize management are the important channels fundamentally addressing these problems.
At present, the low frequency activation of source using is in practice all single antenna, the transmitting range of activation of source is conventionally 5 meters of left and right, and range of signal is less, easily activates less than label, and low-frequency antenna has certain directivity, the low frequency signal field that it is launched is not positive circular but oval-shaped, and this has just caused the signal intensity of label in different directions inconsistent, even there is no signal, therefore also just can not accurately locate, to management, bring a lot of inconvenience and trouble.Simultaneously, also just because existing low frequency activation of source is single antenna, people must arrange that more equipment covers identical region, and the signal that must guarantee them in installation can not have intersection, otherwise will phase mutual interference and produce signal blind zone, so, both increased equipment cost, also increased difficulty of construction, after many antennas low frequency activation of source comes out, competitive power just shows very lowly.
Summary of the invention
The invention provides many antennas radio-frequency recognition system for a kind of double-frequency electronic label, this many antennas radio-frequency recognition system has increased the coverage of low frequency signal, improve the stability of low frequency signal, solve the interference problem between each antenna, little, a plurality of card reader of signal cover that can realize accurate location, decipherment distance is adjustable, solves single antenna activation of source is read same electronic tag and unsettled puzzlement simultaneously, and reduced power consumption, extended the serviceable life of battery, can long-term non-fault running.
For achieving the above object, the technical solution used in the present invention is: many antennas radio-frequency recognition system for a kind of double-frequency electronic label, comprise antenna activation of source, dual-band radio frequency electronic tag and card reader, antenna activation of source is outwards launched low frequency activation signal according to the mode of operation of setting, described dual-band radio frequency electronic tag receives low frequency activation signal and will after the parsing of low frequency activation signal, add that intensity id signal, electronic tag ID information are modulated into high-frequency coding signal, and described card reader receives this high-frequency coding signal;
Described antenna activation of source, comprising: storer, for depositing each low-frequency antenna ID coding and antenna activation of source ID coding;
Low frequency radio frequency circuit and several low-frequency antennas being connected with low frequency radio frequency circuit, described low frequency radio frequency circuit comprise series connection with door and power MOS pipe driver module, described and door forms low frequency activation signal for the data signal modulation from governor circuit is arrived to 125KHz carrier signal, and described power MOS pipe driver module carries out power amplification generation low frequency radio frequency signal by low frequency activation signal;
Power control circuit between low frequency radio frequency circuit and governor circuit, this power control circuit is used for regulating low-frequency antenna emissive power;
The first thin code switch, this the first thin code switch one end is connected to described governor circuit, the other end is connected to for the second thin code switch, RS485 communicating circuit and the high frequency wireless module of mode of operation are set, and described mode of operation comprises the order of work of effective number of antennas, each antenna, the work duration of the emissive power of each antenna, each antenna; Described the second thin code switch, RS485 communicating circuit and high frequency the wireless module separately other end are all connected to described governor circuit, described RS485 communicating circuit is by coming the signal of automatic network to realize the configuration to governor circuit mode of operation, and described high frequency wireless module is by carrying out the configuration of wireless realization to governor circuit mode of operation;
Governor circuit, the low frequency activation signal that the low-frequency antenna ID coding from storer, antenna activation of source ID coding is contained to low-frequency antenna ID coding, antenna activation of source ID coding and mode of operation information by low frequency radio frequency circuit evolving according to the mode of operation setting;
Described dual-band radio frequency electronic tag, comprising:
Low frequency receiving antenna, for receiving the low frequency radio frequency signal from antenna activation of source, and generates the induced signal that contains signal source coding;
Low-frequency channel, generates low-frequency information signal according to the induced signal from low frequency receiving antenna;
High-frequency circuit, for being modulated into coded signal No. ID by the intensity id signal from microcontroller, signal source coding and electronic tag;
High frequency antenna, for being transmitted into space by coded signal by high frequency carrier;
Store the described microcontroller of No. ID, electronic tag, according to described low-frequency information signal, realize the switching of dormancy and starting state.
The further improved technical scheme of technique scheme is as follows:
1. in such scheme, described antenna activation of source also comprises that one is connected to the signal lamp of described governor circuit, and it is for showing the duty of antenna activation of source.
2. in such scheme, described antenna activation of source also comprises a power-switching circuit, for electric energy being provided to antenna activation of source.
3. in such scheme, also comprise that one is connected to the lithium battery of dual-band radio frequency electronic tag, it is for providing power supply; Voltage detection unit between described lithium battery and microcontroller, by the electric weight size of lithium battery described in the voltage from power supply and threshold voltage comparison interpretation.
4. in such scheme, also comprise a pilot lamp, be connected to described microcontroller, be used to indicate the duty of dual-band radio frequency electronic tag.
5. in such scheme, the frequency of described low frequency signal is 125KHz.
6. in such scheme, the frequency of described high frequency carrier is 2.45GHz.
Because technique scheme is used, the present invention compared with prior art has following advantages:
1, radio-frequency recognition system of the present invention has increased the coverage of low frequency signal, improve the stability of low frequency signal, solve the interference problem between each antenna, little, a plurality of card reader of signal cover that can realize accurate location, decipherment distance is adjustable, solves single antenna activation of source is read same electronic tag and unsettled puzzlement simultaneously, and reduced power consumption, extended the serviceable life of battery, can long-term non-fault running.
2, radio-frequency recognition system of the present invention is owing to having adopted the design of many antenna circuits, and signal cover is relatively wider, signal stabilization is high, and frequency of operation is 125KHz, realizes than being easier to, and circuit is simple, with low cost, easy to utilize; It adopts various ways to regulate emissive power, makes installation more flexible, more convenient.
3, radio-frequency recognition system of the present invention, by low frequency and just right the merging of high-frequency circuit, wire communication and wireless communication line, makes serviceability more reliable, and it is more convenient to use, and user Geng Yi accepts use.
4, radio-frequency recognition system of the present invention adopts the adjustable mode of emissive power to design, and makes its signal cover adjustable, can adapt to how different applied environments.
5, radio-frequency recognition system of the present invention, by low frequency and the just right fusion of high-frequency circuit in a tag system, makes power consumption lower, and waking distance up can accurately be controlled within the scope of 0.5 ~ 7 meter, and data communication distance is unaffected.
6, radio-frequency recognition system applicating software programming of the present invention adopts unique mode, makes use very simple, and user, only with carrying, enters while waking region up, and system is processing relevant information automatically.
Accompanying drawing explanation
Accompanying drawing 1 is many antennas of the present invention radio-frequency recognition system structural representation;
Accompanying drawing 2 is radio-frequency recognition system medium and low frequency radio circuit of the present invention and low-frequency antenna circuit diagram;
Accompanying drawing 3 is power control circuit electrical schematics in many antennas of the present invention radio-frequency recognition system;
Accompanying drawing 4 is antenna activation of source main program flow chart in many antennas of the present invention radio-frequency recognition system;
Accompanying drawing 5 is antenna activation of source control subroutine flow chart in many antennas of the present invention radio-frequency recognition system;
Accompanying drawing 6 is many antennas of the present invention radio-frequency recognition system medium-high frequency wireless data communication subroutine flow chart;
Accompanying drawing 7 is RS485 communicating circuit subroutine flow chart in many antennas of the present invention radio-frequency recognition system;
Accompanying drawing 8 is hardware system structure schematic diagram of the present invention;
Accompanying drawing 9 is main program flow chart of the present invention;
Accompanying drawing 10 is the outside wake-up interrupts service subprogram of the present invention process flow diagram;
Accompanying drawing 11 is timer 1 interruption (high-frequency data transmission) service subprogram process flow diagram of the present invention;
Accompanying drawing 12 interrupts (timing configured) service subprogram process flow diagram for timer 2 of the present invention.
In above accompanying drawing: 1, antenna activation of source; 2, dual-band radio frequency electronic tag; 3, card reader; 4, storer; 5, low frequency radio frequency circuit; 51, with door; 52, power MOS pipe driver module; 6, low-frequency antenna; 7, governor circuit; 8, power control circuit; 9, the first thin code switch; 10, the second thin code switch; 11, RS485 communicating circuit; 12, high frequency wireless module; 13, low frequency receiving antenna; 14, low-frequency channel; 15, high-frequency circuit; 16, microcontroller; 17, high frequency antenna; 18, signal lamp; 19, power-switching circuit; 20, lithium battery; 21, voltage detection unit; 22, pilot lamp.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described:
Embodiment: many antennas radio-frequency recognition system for a kind of double-frequency electronic label, comprise antenna activation of source 1, dual-band radio frequency electronic tag 2 and card reader 3, antenna activation of source 1 is outwards launched low frequency activation signal according to the mode of operation of setting, described dual-band radio frequency electronic tag 2 receives low frequency activation signal and will after the parsing of low frequency activation signal, add that intensity id signal, electronic tag ID information are modulated into high-frequency coding signal, and described card reader 3 receives these high-frequency coding signals;
Described antenna activation of source 1, comprising: storer 4, for depositing each low-frequency antenna ID coding and antenna activation of source ID coding;
Low frequency radio frequency circuit 5 and several low-frequency antennas 6 being connected with low frequency radio frequency circuit 5, described low frequency radio frequency circuit 5 comprise series connection with door 51 and power MOS pipe driver module 52, described and door 51 forms low frequency activation signal for the data signal modulation from governor circuit is arrived to 125KHz carrier signal, and described power MOS pipe driver module 52 carries out power amplification by low frequency activation signal and generates low frequency radio frequency signal;
Power control circuit 8 between low frequency radio frequency circuit 5 and governor circuit 7, this power control circuit 8 is for regulating low-frequency antenna 6 emissive powers;
The first thin code switch 9, these the first thin code switch 9 one end are connected to described governor circuit 7, the other end is connected to for the second thin code switch 10, RS485 communicating circuit 11 and the high frequency wireless module 12 of mode of operation are set, and described mode of operation comprises the order of work of effective number of antennas, each antenna, the work duration of the emissive power of each antenna, each antenna; Described the second thin code switch 10, RS485 communicating circuit 11 and high frequency the wireless module 12 separately other end are all connected to described governor circuit 7, described RS485 communicating circuit 11 is by coming the signal of automatic network to realize the configuration to governor circuit 7 mode of operations, and described high frequency wireless module 12 is by carrying out the configuration of wireless realization to governor circuit 7 mode of operations;
Governor circuit 7, generates by the low-frequency antenna ID coding from storer 4, antenna activation of source ID coding the low frequency activation signal that contains low-frequency antenna ID coding, antenna activation of source ID coding and mode of operation information according to the mode of operation setting by low frequency radio frequency circuit 5;
Described dual-band radio frequency electronic tag 2, comprising:
Low frequency receiving antenna 13, for receiving the low frequency radio frequency signal from antenna activation of source 1, and generates the induced signal that contains signal source coding;
Low-frequency channel 14, generates low-frequency information signal according to the induced signal from low frequency receiving antenna 13;
High-frequency circuit 15, for being modulated into coded signal No. ID by the intensity id signal from microcontroller 16, signal source coding and electronic tag;
High frequency antenna 17, for being transmitted into space by coded signal by high frequency carrier;
Store the described microcontroller 16 of No. ID, electronic tag, realize the switching of dormancy and starting state according to described low-frequency information signal, this microcontroller 16 is programmed to:
Step 1, read described low-frequency information signal and generate intensity id signal according to its intensity,
Step 2, analysis are also extracted described low-frequency information signal and are produced signal source coding according to it,
Step 3, within a time interval, start timer and interrupt, under interruption status, carry out successively: open described high-frequency circuit 15, close described high-frequency circuit 15 and open low-frequency channel 14,
Step 4, when the duration, reach the described time interval, exit described timer and interrupt.
Above-mentioned antenna activation of source 1 also comprises that one is connected to the signal lamp 18 of described governor circuit 7, and it is for showing the duty of antenna activation of source 1.
Above-mentioned antenna activation of source also comprises a power-switching circuit 19, for electric energy being provided to antenna activation of source 1; This lithium battery 6 is soft package lithium battery, and the energy density of lithium battery is high, and the lithium battery volume of Soft Roll form is little, is adapted at using in electronic tag.
Also comprise: one is connected to the lithium battery 20 of dual-band radio frequency electronic tag 2, and it is for providing power supply; Voltage detection unit 21 between described lithium battery 20 and microcontroller 16, by the electric weight size of lithium battery 20 described in the voltage from power supply and threshold voltage comparison interpretation.Voltage detection unit between described lithium battery and microcontroller, by the electric weight size of lithium battery described in the voltage from power supply and threshold voltage comparison interpretation, this battery electricity detection method is that electric resistance partial pressure detects, the AD converter of utilizing single-chip microcomputer inside to carry, can determine accurately the voltage of battery, compare with external A/D converter, reduce the power consumption of label, the cost that has reduced again label, is conducive to promote the use of simultaneously.
Also comprise a pilot lamp 22, be connected to described microcontroller 16, be used to indicate the duty of dual-band radio frequency electronic tag 2.
The frequency of above-mentioned low frequency signal is 125KHz, and the frequency of above-mentioned high frequency carrier is 2.45GHz.
Described high frequency antenna is to be placed on circuit board, and data during communication comprise the numbering, low frequency signal intensity, self No. ID, battery electric quantity information of low frequency signal source.Described low-frequency antenna can one dimension antenna, can be also 3D antenna, and one dimension antenna has directional effect, and 3D antenna is not limited by direction.Described signal lamp is light emitting diode.Described system power supply battery forms is soft package lithium battery.Described battery electricity detection method is that electric resistance partial pressure detects.
Described microcontroller 16 has embedded one for the numbering of analysing low frequency signal source and the software algorithm of signal intensity and one group of software algorithm for reducing power consumption.Fig. 2,3,4, the 5th, the process flow diagram of this software algorithm.
Low frequency signal analytical algorithm is explained: the signal Yi Zhengwei unit of low frequency signal source transmitting, each frame data comprises frame head, data start flag, data, end-of-data mark, data check.Dual-frequency label is when receiving the frame originating point information of low frequency signal source transmitting, just start to start AD conversion, calculate the mean value of frame head part transformation result, and using it as signal strength values, then continue to receive low frequency signal, continue conversion, and the data obtained after determining with the signal strength values of gained.After frame data receive, then these frame data are analyzed, legal use, non-rule abandons.Low frequency part continues to enter the signal listen mode that power consumption is extremely low afterwards.
According to low frequency signal intensity value, just can judge accurately the distance between this dual-frequency label and low frequency signal source, thereby the communication distance that can control accurately low frequency part is between 0.5 ~ 7 meter, indirectly is also equivalent to control the communication distance of HFS.
While adopting above-mentioned dual-band radio frequency electronic tag, utilize the characteristic of radio-frequency signal, the aerial propagation rate of 125KHz low frequency signal can reach 4Kbps, and the aerial velocity of propagation of 2.45GHz high-frequency signal can reach 2Mbps.Electric current required during system works is about 13mA, and needed electric current is only 3uA during standby, so we are all set to the highest 4Kbps and 2Mbps by the wireless communication speed of two frequency ranges.The time that so identical communication data amount is used is just the shortest, and the time of system standby is just the longest, and the energy consuming is just minimum, and the serviceable life of battery is just longer; Secondly, can realize closely wake-up, the function of remote data communication, reached on the one hand pinpoint object, on the other hand because most time of this electronic tag is in deep sleep state, power consumption is extremely low, can make the electric weight in single-lithium-battery pond use the longer time for it, extends the serviceable life of label.
Dual-frequency label circuit board is after installation battery, encapsulation, test are dispatched from the factory, and under normal circumstances in deep sleep, power consumption is extremely low, and overall power is about 3uA.Only when carrying the personnel of double-frequency electronic label (abbreviation dual-frequency label) or coverage (0.5-7m) that object enters low frequency signal source, the low frequency signal detecting chip of dual-frequency label just can detect this signal, the soon MCU of dormant state of existing side by side wakes up, makes it enter duty.And then No. ID (with other information) of the battery electric quantity information of the numbering of low frequency signal source, low frequency signal intensity, dual-frequency label, dual-frequency label form is according to the rules sent to distant card reader or double-frequency card reader with the form of high frequency.Can find out that according to this this dual-frequency label has following features: closely wake up, telecommunication, and wake source is known, wakes distance up known.Avoided the distant and interactional problem of Card Reader due to card reader.Card reader receives after high-frequency wireless signals, data that can obtain according to fixed format analysis, and these data are temporarily stored in respectively to read write line neutralization according to fixing agreement, with wired (RS485/RS232/ Ethernet/light etc.) or the mode of wireless (GPRS/CDMA/WIFI/3G etc.), these information are uploaded to management and dispatching center.Telemanagement dispatching center receives after data, just can make accordingly corresponding judgement, and do the work such as further management and dispatching.
Many antennas low frequency activation of source dispatches from the factory after tested, and after installing and setting mode of operation, the mode of operation that just starts to set is ceaselessly outwards launched low frequency activation signal, and this low frequency activation signal includes the ID coding of each antenna and the ID coding of equipment.When carrying that the carrier of double-frequency electronic label enters or during through signal coverage areas, will receiving this signal, then label sends to card reader by some information of adding label self after signal resolution with high frequency form.In this information, include following content: the electric weight of the ID of each antenna in the ID of many antennas activation of source, activation of source, the signal intensity while receiving signal, label, label No. ID, other information (temperature, humidity, pressure, gravity, speed etc.) etc.Card reader adds the ID of oneself again in these information, then final information is uploaded to upper level administration module.Administration module may have various ways, such as: 1, can be the rig-site utilization equipment such as a controller, this equipment will carry out at the scene information processing and make corresponding management action, carry out the service for people.2, can be the user application software in Remote management center operation, this software to these information processings after, or file or prompting or continue as other equipment data etc. are provided, instruct relevant work personnel to do further work.
Above-described embodiment is only explanation technical conceive of the present invention and feature, and its object is to allow person skilled in the art can understand content of the present invention and implement according to this, can not limit the scope of the invention with this.All equivalences that Spirit Essence is done according to the present invention change or modify, within all should being encompassed in protection scope of the present invention.
Claims (1)
1. many antennas radio-frequency recognition system for double-frequency electronic label, it is characterized in that: comprise antenna activation of source (1), dual-band radio frequency electronic tag (2) and card reader (3), antenna activation of source (1) is outwards launched low frequency activation signal according to the mode of operation of setting, described dual-band radio frequency electronic tag (2) receives low frequency activation signal and will after the parsing of low frequency activation signal, add that intensity id signal, electronic tag ID information are modulated into high-frequency coding signal, and described card reader (3) receives this high-frequency coding signal;
Described antenna activation of source (1), comprising: storer (4), for depositing each low-frequency antenna ID coding and antenna activation of source ID coding;
Low frequency radio frequency circuit (5) and several low-frequency antennas (6) being connected with low frequency radio frequency circuit (5), described low frequency radio frequency circuit (5) comprise series connection with door (51) and power MOS pipe driver module (52), described and door (51) forms low frequency activation signal for the data signal modulation from governor circuit is arrived to 125KHz carrier signal, and described power MOS pipe driver module (52) carries out power amplification by low frequency activation signal and generates low frequency radio frequency signal;
Be positioned at power control circuit (8) between low frequency radio frequency circuit (5) and governor circuit (7), this power control circuit (8) is for regulating low-frequency antenna (6) emissive power;
The first thin code switch (9), this the first thin code switch (9) one end is connected to described governor circuit (7), the other end is connected to for the second thin code switch (10), RS485 communicating circuit (11) and the high frequency wireless module (12) of mode of operation are set, and described mode of operation comprises the order of work of effective number of antennas, each antenna, the work duration of the emissive power of each antenna, each antenna; Described the second thin code switch (10), RS485 communicating circuit (11) and high frequency wireless module (12) the separately other end are all connected to described governor circuit (7), described RS485 communicating circuit (11) is by coming the signal of automatic network to realize the configuration to governor circuit (7) mode of operation, and described high frequency wireless module (12) is by carrying out the configuration of wireless realization to governor circuit (7) mode of operation;
Governor circuit (7), is positioned between the first thin code switch (9) and low frequency radio frequency circuit (5);
Described dual-band radio frequency electronic tag (2), comprising:
Low frequency receiving antenna (13), for receiving the low frequency radio frequency signal from antenna activation of source (1), and generates the induced signal that contains signal source coding;
Low-frequency channel (14), generates low-frequency information signal according to the induced signal from low frequency receiving antenna (13);
High-frequency circuit (15), for being modulated into coded signal No. ID by the intensity id signal from microcontroller (16), signal source coding and electronic tag;
High frequency antenna (17), for being transmitted into space by coded signal by high frequency carrier;
Store the described microcontroller (16) of No. ID, electronic tag, according to described low-frequency information signal, realize the switching of dormancy and starting state.
2. many antennas radio-frequency recognition system according to claim 1, is characterized in that: described antenna activation of source (1) also comprises that one is connected to the signal lamp (18) of described governor circuit (7), and it is for showing the duty of antenna activation of source (1).
3. many antennas radio-frequency recognition system according to claim 1, is characterized in that: described antenna activation of source also comprises a power-switching circuit (19), for electric energy being provided to antenna activation of source (1).
4. many antennas radio-frequency recognition system according to claim 1, is characterized in that: also comprise: one is connected to the lithium battery (20) of dual-band radio frequency electronic tag (2), and it is for providing power supply; Be positioned at the voltage detection unit (21) between described lithium battery (20) and microcontroller (16), by the electric weight size of lithium battery (20) described in the voltage from power supply and threshold voltage comparison interpretation.
5. many antennas radio-frequency recognition system according to claim 1, is characterized in that: also comprise a pilot lamp (22), be connected to described microcontroller (16), be used to indicate the duty of dual-band radio frequency electronic tag (2).
6. many antennas radio-frequency recognition system according to claim 1, is characterized in that: the frequency of described low frequency signal is 125KHz.
7. many antennas radio-frequency recognition system according to claim 1, is characterized in that: the frequency of described high frequency carrier is 2.45GHz.
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| CN201320761523.9U CN203930845U (en) | 2013-11-27 | 2013-11-27 | Many antennas radio-frequency recognition system for double-frequency electronic label |
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| CN201320761523.9U CN203930845U (en) | 2013-11-27 | 2013-11-27 | Many antennas radio-frequency recognition system for double-frequency electronic label |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104991595A (en) * | 2015-06-25 | 2015-10-21 | 苏州木兰电子科技有限公司 | Radio frequency identification-based vegetable greenhouse monitoring and management system |
| CN105653997A (en) * | 2015-02-05 | 2016-06-08 | 上海秀派电子科技有限公司 | Low frequency signal conditioning and demodulation system |
| CN107818357A (en) * | 2017-12-08 | 2018-03-20 | 江苏飞视文化发展有限公司 | A kind of radio frequency identification logistics system |
-
2013
- 2013-11-27 CN CN201320761523.9U patent/CN203930845U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105653997A (en) * | 2015-02-05 | 2016-06-08 | 上海秀派电子科技有限公司 | Low frequency signal conditioning and demodulation system |
| CN105653997B (en) * | 2015-02-05 | 2018-06-15 | 上海秀派电子科技有限公司 | A kind of low frequency signal conditioning and demodulating system |
| CN104991595A (en) * | 2015-06-25 | 2015-10-21 | 苏州木兰电子科技有限公司 | Radio frequency identification-based vegetable greenhouse monitoring and management system |
| CN107818357A (en) * | 2017-12-08 | 2018-03-20 | 江苏飞视文化发展有限公司 | A kind of radio frequency identification logistics system |
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