CN103632116A - Multi-path radio frequency antenna shifter and RFID (radio frequency identification) multi-antenna system - Google Patents
Multi-path radio frequency antenna shifter and RFID (radio frequency identification) multi-antenna system Download PDFInfo
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Abstract
The invention relates to the technical field of RFID (radio frequency identification), in particular to a multi-path radio frequency antenna shifter and an RFID multi-antenna system, which can be used for effectively reducing the leaking-missing ratio and the wrong-detecting ratio. The multi-path radio frequency antenna shifter and the RFID multi-antenna system comprise a radio frequency reader-writer, a radio frequency switch unit formed by more than two paths of radio frequency switch circuits, a controller and a radio frequency switch group formed by more than two radio frequency antennas; the multi-path radio frequency antenna shifter and the RFID multi-antenna system are characterized in that the control signal output end of the radio frequency reader-writer is connected with the controller; the radio frequency signal output end of the radio frequency reader-writer is connected with the radio frequency switch unit of which the output end is connected with the radio frequency antenna group; the control signal output end of the controller is connected with the control signal input end of the radio frequency switch unit. Compared with the prior art, the multi-path radio frequency antenna shifter and the RFID multi-antenna system have the advantages that the problems of low detection success rate caused by insufficient energy of multiple antennas and collision of multiple paths of radio frequency signals when the existing radio frequency reader-writer works in a one-driving-more way and the like are solved, the detection successful ration is improved and the like.
Description
Technical field
The present invention relates to radio-frequency (RF) identification (RFID, Radio Frequency Identification) technical field, specifically a kind ofly can effectively reduce multi-channel rf antenna-switching device and RFID multiaerial system undetected, false drop rate.
Background technology
As everyone knows, radio-frequency recognition system generally comprises electronic tag, read write line and backend application system three parts, wherein read write line is for connecting the main thoroughfare of backend application system and electronic tag, mainly comprise: Anneta module, radio-frequency channel module and control processing module, wherein radio-frequency channel module and control processing module can directly be integrated in read write line again, part read write line can also be integrated with Anneta module, during work, each read write line drives an antenna corresponding thereto, but the limited coverage area of single antenna, especially many at barrier, in the situation of circumstance complication, its effective coverage distance can further shorten, be unfavorable for reading fast a large amount of electronic tags, therefore most radio-frequency recognition systems adopt the mode that makes a plurality of antennas of read write line band, current common form comprises is with two, one band fourth class form, but reading and writing device antenna quantity cannot infinite expanding, this be due to: one, when the array that a plurality of reading and writing device antennas form reads a label simultaneously, in control processing module, there will be collision, treatment effeciency is controlled in impact, two, in national standard, the emissive power to read write line is restricted, with this understanding, by a plurality of prevention at radio-frequency port of parallel connection, drives a plurality of antennas to work, and can reduce the useful power of each antenna, shortens antenna and reads distance.
In existing rfid system, during twin aerial work, adopt the form of power division to realize, the power averaging of frequency read/write is distributed to two antennas, each antenna only obtains half of frequency read/write power, the energy that each antenna obtains so seldom, to the label between two antennas, can have few inspection, undetected situation, and it is uncontrollable between twin aerial, to work, can only selects antenna sets to work or antenna sets is not worked simultaneously simultaneously, reading performance is unstable, reads success ratio low.
Summary of the invention
When the present invention is directed to existing frequency read/write and working under a band multi-mode, the problems such as power is low that are detected as that a plurality of antenna energy deficiencies and multi-channel rf signal bump and cause, have proposed a kind ofly can effectively improve multi-channel rf antenna-switching device and the RFID multiaerial system that is detected as power.
The present invention can reach by following measures:
A kind of multi-channel rf antenna-switching device, comprise radio-frequency (RF) switch unit, controller, two radio-frequency antenna groups that above radio-frequency antenna forms that frequency read/write, the above radio-frequency switch circuit of two-way form, the control signal output terminal that it is characterized in that frequency read/write is connected with controller, the radiofrequency signal output terminal of frequency read/write is connected with radio-frequency (RF) switch unit, the output terminal of radio-frequency (RF) switch unit is connected with radio-frequency antenna group, and the control signal output terminal of controller is connected with the control signal input end of radio-frequency (RF) switch unit.
The power amplification circuit that frequency read/write of the present invention is provided with microcontroller chip ARM, the modulation circuit being connected with microcontroller chip, is connected with modulation circuit output terminal, wherein the output terminal of power amplification circuit is connected with the input end of radio-frequency (RF) switch unit, makes the radiofrequency signal of power amplification circuit output send into radio-frequency antenna after the selection of radio-frequency (RF) switch unit.
In controller of the present invention, be provided with microcontroller chip, this microcontroller chip also can adopt ARM to realize, the control signal input end of controller is connected with microcontroller chip ARM in frequency read/write, corresponding control command during for received RF read write line output radiofrequency signal, controller is according to this control command, to radio-frequency (RF) switch unit output switching control command, control the break-make of the multi-channel rf on-off circuit in radio-frequency (RF) switch unit.
In radio-frequency (RF) switch of the present invention unit, radio-frequency switch circuit comprises high level conduction module and the match circuit being connected with high level conduction module, wherein the control signal input end of high level conduction module is connected with controller, the radio-frequency (RF) signal input end of high level conduction module is connected with the output terminal of power amplification circuit in frequency read/write, and match circuit is connected with radio-frequency antenna.
The present invention is also provided with pilot lamp, is used to indicate the On/Off state of certain road radio-frequency (RF) switch.
In radio-frequency switch circuit of the present invention, high level conduction module is provided with HF switch control circuit, alternating current-direct current turning circuit, and wherein HF switch control circuit is provided with triode, for the signal of control module being converted to the Continuity signal of direct current; Alternating current-direct current turning circuit is for providing the guiding path of direct current signal and AC signal, thereby realize while deserving not conducting of direct current signal, AC signal is not conducting of radiofrequency signal, when direct current signal conducting, AC signal is radiofrequency signal conducting, rely on the characteristic of alternating current-direct current turning circuit, can complete antenna switching controls arbitrarily.
In controller of the present invention, be also provided with control enable circuits, for realizing controller work, enable.
When the present invention uses, frequency read/write provides radiofrequency signal, and radiofrequency signal is delivered to radio-frequency (RF) switch unit, it is also address signal that while frequency read/write provides the control command corresponding with the radiofrequency signal of exporting to controller, controller receives after the address signal being sent by frequency read/write, first judge whether enable control circuit enables, when enabling after control circuit enables, controller is started working, address signal is converted to the control signal of low and high level, and send control signal to radio-frequency (RF) switch unit, in radio-frequency (RF) switch unit, be provided with radio-frequency switch circuit more than two-way, radio-frequency switch circuit is provided with alternating current-direct current turning circuit and HF switch control circuit, alternating current-direct current turning circuit provides the guiding path of direct current signal and AC signal, HF switch control circuit converts the control signal of low and high level to alternating current-direct current Continuity signal, corresponding radio-frequency antenna group antenna just can be worked selectively, thereby realize the switching controls between twin aerial.
A RFID multiaerial system, is provided with multi-channel rf antenna-switching device and plural RFID label to be read, it is characterized in that multi-channel rf antenna-switching device is said structure.
The present invention compared with prior art, has the following advantages: it is high that (1) reads success ratio: twin aerial switching controls, and make two antennas all obtain whole power of radiofrequency signal, the energy that antenna obtains is many, reads success ratio high; (2) reading performance is stable: twin aerial switching controls, and the energy that the label at two antenna edge places is obtained is many, and reading performance is good, and reading performance is naturally very stable; (3) controlled to any twin aerial work: by firmware, to control the address selection realizing antenna, by hardware circuit, realize the conducting of antennas paths radiofrequency signal, thereby guarantee that twin aerial work is controlled; (4) flexible and convenient operation: can be to switching controls between any two antennas, simple and convenient.
accompanying drawing explanation:
Accompanying drawing 1 is the structural representation of multi-channel rf antenna-switching device in the present invention.
Accompanying drawing 2 is structural representations of frequency read/write in the present invention.
Accompanying drawing 3 is structural representations of RFID multiaerial system in the present invention.
Reference numeral: frequency read/write 1, radio-frequency (RF) switch unit 2, controller 3, radio-frequency antenna group 4, pilot lamp 5, radio-frequency switch circuit 6, radio-frequency antenna 7, microcontroller chip 8, modulation circuit 9, power amplification circuit 10, HF switch control circuit 11, alternating current-direct current turning circuit 12, match circuit 13, radio-frequency (RF) tag 14.
embodiment:
Below in conjunction with drawings and Examples, the present invention is further illustrated.
As shown in Figure 1, the present invention proposes a kind of multi-channel rf antenna-switching device, comprise frequency read/write 1, the radio-frequency (RF) switch unit 2 that the above radio-frequency switch circuit 6 of two-way forms, controller 3, two radio-frequency antenna groups 4 that above radio-frequency antenna 7 forms, the control signal output terminal that it is characterized in that frequency read/write 1 is connected with controller 3, the radiofrequency signal output terminal of frequency read/write 1 is connected with radio-frequency (RF) switch unit 2, the output terminal of radio-frequency (RF) switch unit 2 is connected with radio-frequency antenna group 4, the control signal output terminal of controller 3 is connected with the control signal input end of radio-frequency (RF) switch unit 2, plural radio-frequency antenna 7 in radio-frequency antenna group 4 is corresponding one by one with the radio-frequency switch circuit 6 more than interior two-way in radio-frequency (RF) switch unit 2, thereby realize the corresponding duty of controlling a road radio-frequency antenna 7 of every road radio-frequency switch circuit 6.
As shown in Figure 2, frequency read/write 1 of the present invention is provided with microcontroller chip 8(ARM), the modulation circuit 9 being connected with microcontroller chip 8, the power amplification circuit 10 being connected with modulation circuit 9 output terminals, wherein the output terminal of power amplification circuit 10 is connected with the input end of radio-frequency (RF) switch unit 2, make the radiofrequency signal of power amplification circuit 10 outputs after the selection of radio-frequency (RF) switch unit 2, send into radio-frequency antenna 7, in addition in frequency read/write 1, be also provided with the receiving circuit that reads RFID label information for receiving and processing, receiving circuit adopts existing techniques in realizing, this does not repeat.
In controller 3 of the present invention, be provided with microcontroller chip, this microcontroller chip also can adopt ARM to realize, the control signal input end of controller 3 is connected with microcontroller chip ARM in frequency read/write 1, corresponding control command during for received RF read write line output radiofrequency signal, controller 3 is according to this control command, the 2 output switching control commands to radio-frequency (RF) switch unit, the break-make of the multi-channel rf on-off circuit 6 in control radio-frequency (RF) switch unit 2.
In radio-frequency (RF) switch of the present invention unit 2, radio-frequency switch circuit 6 comprises high level conduction module and the match circuit 13 being connected with high level conduction module, wherein the control signal input end of high level conduction module is connected with controller, the radio-frequency (RF) signal input end of high level conduction module is connected with the output terminal of power amplification circuit in frequency read/write, and match circuit 13 is connected with radio-frequency antenna 7; Wherein in radio-frequency switch circuit 6 of the present invention, high level conduction module is provided with HF switch control circuit 11, alternating current-direct current turning circuit 12, and wherein HF switch control circuit 11 is provided with triode, for the signal of control module being converted to the Continuity signal of direct current; Alternating current-direct current turning circuit 12 is for providing the guiding path of direct current signal and AC signal, thereby realize while deserving not conducting of direct current signal, AC signal is not conducting of radiofrequency signal, when direct current signal conducting, AC signal is radiofrequency signal conducting, rely on the characteristic of alternating current-direct current turning circuit, can complete antenna switching controls arbitrarily.
The present invention is also provided with pilot lamp 5, is used to indicate the On/Off state of certain road radio-frequency (RF) switch.
In controller 3 of the present invention, be also provided with control enable circuits, for realizing controller work, enable.
When the present invention uses, frequency read/write 1 provides radiofrequency signal, and radiofrequency signal is delivered to radio-frequency (RF) switch unit 2, it is also address signal that while frequency read/write 1 provides the control command corresponding with the radiofrequency signal of exporting to controller 3, controller 3 receives after the address signal being sent by frequency read/write 1, first judge whether enable control circuit enables, when enabling after control circuit enables, controller 3 is started working, address signal is converted to the control signal of low and high level, and send control signal to radio-frequency (RF) switch unit 2, in radio-frequency (RF) switch unit 2, be provided with radio-frequency switch circuit more than two-way, radio-frequency switch circuit is provided with alternating current-direct current turning circuit and HF switch control circuit, alternating current-direct current turning circuit provides the guiding path of direct current signal and AC signal, HF switch control circuit converts the control signal of low and high level to alternating current-direct current Continuity signal, corresponding radio-frequency antenna group antenna just can be worked selectively, thereby realize the switching controls between twin aerial.
As shown in Figure 3, the invention allows for a kind of RFID multiaerial system, be provided with multi-channel rf antenna-switching device and plural RFID label 14 to be read, it is characterized in that multi-channel rf antenna-switching device is said structure.
The present invention compared with prior art, has the following advantages: it is high that (1) reads success ratio: twin aerial switching controls, and make two antennas all obtain whole power of radiofrequency signal, the energy that antenna obtains is many, reads success ratio high; (2) reading performance is stable: twin aerial switching controls, and the energy that the label at two antenna edge places is obtained is many, and reading performance is good, and reading performance is naturally very stable; (3) controlled to any twin aerial work: by firmware, to control the address selection realizing antenna, by hardware circuit, realize the conducting of antennas paths radiofrequency signal, thereby guarantee that twin aerial work is controlled; (4) flexible and convenient operation: can be to switching controls between any two antennas, simple and convenient.
Claims (7)
1. a multi-channel rf antenna-switching device, comprise radio-frequency (RF) switch unit, controller, two radio-frequency antenna groups that above radio-frequency antenna forms that frequency read/write, the above radio-frequency switch circuit of two-way form, the control signal output terminal that it is characterized in that frequency read/write is connected with controller, the radiofrequency signal output terminal of frequency read/write is connected with radio-frequency (RF) switch unit, the output terminal of radio-frequency (RF) switch unit is connected with radio-frequency antenna group, and the control signal output terminal of controller is connected with the control signal input end of radio-frequency (RF) switch unit.
2. a kind of multi-channel rf antenna-switching device according to claim 1, it is characterized in that the power amplification circuit that described frequency read/write is provided with microcontroller chip ARM, the modulation circuit being connected with microcontroller chip, is connected with modulation circuit output terminal, wherein the output terminal of power amplification circuit is connected with the input end of radio-frequency (RF) switch unit.
3. a kind of multi-channel rf antenna-switching device according to claim 2, is characterized in that being provided with microcontroller chip in described controller, and the control signal input end of controller is connected with microcontroller chip ARM in frequency read/write.
4. a kind of multi-channel rf antenna-switching device according to claim 1, it is characterized in that in radio-frequency (RF) switch unit, radio-frequency switch circuit comprises high level conduction module and the match circuit being connected with high level conduction module, wherein the control signal input end of high level conduction module is connected with controller, the radio-frequency (RF) signal input end of high level conduction module is connected with the output terminal of power amplification circuit in frequency read/write, and match circuit is connected with radio-frequency antenna.
5. a kind of multi-channel rf antenna-switching device according to claim 1, is characterized in that being provided with pilot lamp, and pilot lamp is connected with the radio-frequency switch circuit in radio-frequency (RF) switch unit.
6. a kind of multi-channel rf antenna-switching device according to claim 1, it is characterized in that in radio-frequency switch circuit, high level conduction module is provided with HF switch control circuit, alternating current-direct current turning circuit, HF switch control circuit is connected with alternating current-direct current turning circuit.
7. a RFID multiaerial system, is provided with multi-channel rf antenna-switching device and plural RFID label to be read, it is characterized in that the multi-channel rf antenna-switching device as described in any one in claim 1-6.
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CN201310592442.5A CN103632116B (en) | 2013-11-22 | Multi-channel rf antenna-switching device and RFID multiaerial system |
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CN201310592442.5A CN103632116B (en) | 2013-11-22 | Multi-channel rf antenna-switching device and RFID multiaerial system |
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Cited By (15)
Publication number | Priority date | Publication date | Assignee | Title |
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CN104112107A (en) * | 2014-06-30 | 2014-10-22 | 深圳市远望谷信息技术股份有限公司 | Antenna alternation method and device of multi-antenna RFID system |
CN104504425A (en) * | 2014-12-30 | 2015-04-08 | 威海北洋电气集团股份有限公司 | Radio-frequency signal read-write switching circuit and radio-frequency reader-writer |
CN105224895A (en) * | 2014-07-03 | 2016-01-06 | 启碁科技股份有限公司 | Radio frequency recognition reading device |
CN105426804A (en) * | 2015-12-14 | 2016-03-23 | 威海北洋电气集团股份有限公司 | Radio frequency signal read-write switching circuit |
CN105426797A (en) * | 2015-10-30 | 2016-03-23 | 上海十贝电子科技有限公司 | Random emission anti-conflict LF triggering method |
CN106485925A (en) * | 2016-12-28 | 2017-03-08 | 芜湖乐锐思信息咨询有限公司 | Traffic information system based on data reduction treatment technology |
CN106815540A (en) * | 2017-01-19 | 2017-06-09 | 厦门芯曙光科技有限公司 | RFID location system based on multi-mode communication |
CN107392076A (en) * | 2017-09-07 | 2017-11-24 | 广州佳都数据服务有限公司 | A kind of multiple antennas control circuit and multiple antennas read write line |
CN107766764A (en) * | 2017-10-30 | 2018-03-06 | 上海华虹集成电路有限责任公司 | A kind of collision-proof method of 2.4G active electronic labels |
CN108154061A (en) * | 2018-02-11 | 2018-06-12 | 樊荣 | A kind of control system for controlling electrical equipment power on/off |
CN108280383A (en) * | 2018-04-25 | 2018-07-13 | 广州周立功单片机科技有限公司 | Multiple antennas RFID circuit |
CN108376230A (en) * | 2018-04-25 | 2018-08-07 | 广州周立功单片机科技有限公司 | Multiple antennas RFID circuit |
CN109512158A (en) * | 2018-09-26 | 2019-03-26 | 威海北洋光电信息技术股份公司 | RFID intelligent storage cabinet and its application |
CN110909554A (en) * | 2019-10-09 | 2020-03-24 | 威海北洋光电信息技术股份公司 | RFID intelligent bookshelf multi-row synchronous detection method and bookshelf |
CN116582118A (en) * | 2023-07-12 | 2023-08-11 | 杭州晟珈智能科技有限公司 | RFID antenna virtual switch circuit and multi-antenna multiplexing device |
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CN203573325U (en) * | 2013-11-22 | 2014-04-30 | 威海北洋电气集团股份有限公司 | Multichannel radio frequency antenna switching device and RFID multi-antenna device |
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US20060165039A1 (en) * | 2003-01-30 | 2006-07-27 | Geoff Lyon | RFID reader device having closely packed antennas |
US20060214799A1 (en) * | 2005-03-25 | 2006-09-28 | Seiko Epson Corporation | Reader/writer |
CN101408947A (en) * | 2007-10-09 | 2009-04-15 | 西门子公司 | Wireless radio frequency identification reader-writer and method for implementing antenna switch |
CN102496036A (en) * | 2011-11-16 | 2012-06-13 | 深圳市远望谷信息技术股份有限公司 | Antenna switching device for receiving and transmitting diversity and RFID (Radio Frequency Identification) reader-writer |
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Cited By (22)
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CN104112107A (en) * | 2014-06-30 | 2014-10-22 | 深圳市远望谷信息技术股份有限公司 | Antenna alternation method and device of multi-antenna RFID system |
CN105224895A (en) * | 2014-07-03 | 2016-01-06 | 启碁科技股份有限公司 | Radio frequency recognition reading device |
CN105224895B (en) * | 2014-07-03 | 2018-01-23 | 启碁科技股份有限公司 | Radio frequency recognition reading device |
CN104504425A (en) * | 2014-12-30 | 2015-04-08 | 威海北洋电气集团股份有限公司 | Radio-frequency signal read-write switching circuit and radio-frequency reader-writer |
CN105426797A (en) * | 2015-10-30 | 2016-03-23 | 上海十贝电子科技有限公司 | Random emission anti-conflict LF triggering method |
CN105426797B (en) * | 2015-10-30 | 2018-07-06 | 上海十贝电子科技有限公司 | The LF triggering methods of random transmitting anti-collision |
CN105426804A (en) * | 2015-12-14 | 2016-03-23 | 威海北洋电气集团股份有限公司 | Radio frequency signal read-write switching circuit |
CN105426804B (en) * | 2015-12-14 | 2018-10-26 | 威海北洋电气集团股份有限公司 | Radiofrequency signal reads and writes switching circuit |
CN106485925A (en) * | 2016-12-28 | 2017-03-08 | 芜湖乐锐思信息咨询有限公司 | Traffic information system based on data reduction treatment technology |
CN106815540A (en) * | 2017-01-19 | 2017-06-09 | 厦门芯曙光科技有限公司 | RFID location system based on multi-mode communication |
CN107392076A (en) * | 2017-09-07 | 2017-11-24 | 广州佳都数据服务有限公司 | A kind of multiple antennas control circuit and multiple antennas read write line |
CN107392076B (en) * | 2017-09-07 | 2023-11-10 | 广州佳都数据服务有限公司 | Multi-antenna control circuit and multi-antenna reader-writer |
CN107766764A (en) * | 2017-10-30 | 2018-03-06 | 上海华虹集成电路有限责任公司 | A kind of collision-proof method of 2.4G active electronic labels |
CN108154061A (en) * | 2018-02-11 | 2018-06-12 | 樊荣 | A kind of control system for controlling electrical equipment power on/off |
CN108376230A (en) * | 2018-04-25 | 2018-08-07 | 广州周立功单片机科技有限公司 | Multiple antennas RFID circuit |
CN108280383A (en) * | 2018-04-25 | 2018-07-13 | 广州周立功单片机科技有限公司 | Multiple antennas RFID circuit |
CN109512158A (en) * | 2018-09-26 | 2019-03-26 | 威海北洋光电信息技术股份公司 | RFID intelligent storage cabinet and its application |
CN109512158B (en) * | 2018-09-26 | 2021-02-26 | 威海北洋光电信息技术股份公司 | RFID intelligent storage cabinet and application thereof |
CN110909554A (en) * | 2019-10-09 | 2020-03-24 | 威海北洋光电信息技术股份公司 | RFID intelligent bookshelf multi-row synchronous detection method and bookshelf |
CN110909554B (en) * | 2019-10-09 | 2023-04-04 | 威海北洋光电信息技术股份公司 | RFID intelligent bookshelf multi-row synchronous detection method and bookshelf |
CN116582118A (en) * | 2023-07-12 | 2023-08-11 | 杭州晟珈智能科技有限公司 | RFID antenna virtual switch circuit and multi-antenna multiplexing device |
CN116582118B (en) * | 2023-07-12 | 2023-10-13 | 杭州晟珈智能科技有限公司 | RFID antenna virtual switch circuit and multi-antenna multiplexing device |
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