CN103793726A - Expansion adapter for ultrahigh-frequency FRID reader-writer - Google Patents

Expansion adapter for ultrahigh-frequency FRID reader-writer Download PDF

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Publication number
CN103793726A
CN103793726A CN201210426194.2A CN201210426194A CN103793726A CN 103793726 A CN103793726 A CN 103793726A CN 201210426194 A CN201210426194 A CN 201210426194A CN 103793726 A CN103793726 A CN 103793726A
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China
Prior art keywords
power amplifier
rfid
reader
write line
read write
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Pending
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CN201210426194.2A
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Chinese (zh)
Inventor
陈禹
张磊
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SHANGHAI RFID SYSTEM TECHNOLOGY Co Ltd
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SHANGHAI RFID SYSTEM TECHNOLOGY Co Ltd
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Priority to CN201210426194.2A priority Critical patent/CN103793726A/en
Publication of CN103793726A publication Critical patent/CN103793726A/en
Pending legal-status Critical Current

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Abstract

The invention provides an expansion adapter for an ultrahigh-frequency FRID reader-writer. The expansion adapter for an ultrahigh-frequency FRID reader-writer comprises a reader-writer, a power amplifier connected with the reader-writer, an antenna switching device connected with the power amplifier, multiple antennas connected with the antenna switching device, and a main controller, wherein the scope of the frequency range of the multiple antennas is between 902MHz to 928 MHz; the main controller is connected with the reader-writer, the power amplifier, and the antenna switching device and is used for performing information interaction with the reader-writer, adjusting the amplification coefficient of the power amplifier, and controlling the antenna switching device to switch among the multiple antennas. The expansion adapter for an ultrahigh-frequency FRID reader-writer is capable of controlling the transmitting power of the antennas and providing a uniform reader-writer interface to external devices.

Description

Ultrahigh frequency radio frequency identification (RFID) reader extension adapter
Technical field
The present invention relates to a kind of ultrahigh frequency radio frequency identification (RFID) reader extension adapter.
Background technology
Radio-frequency (RF) identification (RFID, Radio Frequency Identification) technology is called again electronic tag, radio frequency identification, can be identified specific objective and be read and write related data by wireless signal.RFID technology has been widely used in every field at present, as library, gate control system, food security are traced to the source etc.
Rfid interrogator carries out radio communication by antenna and RFID electronic tag, can realize the read or write operation to tag recognition code and internal storage data.Rfid interrogator point can be divided into low frequency, high frequency, ultrahigh frequency etc. according to frequency range, can be divided into portable with fixed according to portable degree.
In prior art, the kind of rfid interrogator is a lot, but its power is often less, and result of use is poor; And the interface function providing a little less than, cannot meet the demand of actual items.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of ultrahigh frequency radio frequency identification (RFID) reader extension adapter, emissive power that can control antenna and unified read write line interface can be externally provided.
For solving the problems of the technologies described above, the invention provides a kind of ultrahigh frequency radio frequency identification (RFID) reader extension adapter, comprising:
Read write line;
The power amplifier being connected with described read write line;
The antenna switcher being connected with described power amplifier;
The multiple antennas that are connected with described antenna switcher, the band limits of described multiple antennas is 902MHz～928MHz;
The master controller being connected with described read write line, power amplifier and antenna switcher, for and described read write line carry out information interaction, regulate the amplification coefficient of described power amplifier and control described antenna switcher switching between described multiple antennas.
According to one embodiment of present invention, described ultrahigh frequency radio frequency identification (RFID) reader extension adapter also comprises: with the external interface that described read write line is connected, described master controller carries out data interaction via described external interface and outside.
According to one embodiment of present invention, described power amplifier comprises class ab ammplifier.
According to one embodiment of present invention, described power amplifier also comprises the LC antiresonant circuit being connected with described class ab ammplifier.
According to one embodiment of present invention, the power of described power amplifier output is 1～30W in sending out.
According to one embodiment of present invention, described antenna switcher comprises multiple switches, and wherein each switch is connected with in described multiple antennas one respectively.
According to one embodiment of present invention, described master controller is STM32F103 Series of MCU.
Compared with prior art, the present invention has the following advantages:
The ultrahigh frequency radio frequency identification (RFID) reader extension adapter of the embodiment of the present invention comprises the power amplifier being connected with read write line, and emissive power that can control antenna, is conducive to improve the reception of antenna and the quality of transmitted signal in read-write process.
In addition, in the ultrahigh frequency radio frequency identification (RFID) reader extension adapter of the embodiment of the present invention, master controller and read write line carry out information interaction, and master controller carries out data interaction via external interface and the external world, in the time changing different read write lines, the communication protocol of new read write line can be identified and translate to master controller, thereby can realize communicating by letter between the external world and read write line by unified external interface.
In addition, the ultrahigh frequency radio frequency identification (RFID) reader extension adapter of the embodiment of the present invention also comprises antenna switcher, can switch the use of multiple antennas.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of the ultrahigh frequency radio frequency identification (RFID) reader extension adapter of the embodiment of the present invention.
Embodiment
Below in conjunction with specific embodiments and the drawings, the invention will be further described, but should not limit the scope of the invention with this.
With reference to figure 1, the ultrahigh frequency radio frequency identification (RFID) reader extension adapter of the present embodiment comprises: read write line 11, power amplifier 12, antenna switcher 13, multiple antenna 14, master controller 15 and external interface 16.
Wherein, read write line 11 can be various types of rfid interrogators in prior art, for example fixed or portable rfid interrogator.
Power amplifier 12 is connected with read write line 11, and the signal power of transmission is amplified.As a nonrestrictive example, the LC antiresonant circuit that power amplifier 12 can comprise class ab ammplifier and be connected with this class ab ammplifier.Wherein class ab ammplifier can be realized the secondary amplification of the output power of the low power read write line of centering, and LC antiresonant circuit can form matching network with peripheral components.Adopt similar structure to there is the advantages such as design cost is low, efficiency is high, performance is good.
In the present embodiment, the output power of power amplifier 12 can be 1～30W, and its power amplification coefficient power amplification ratio is controlled and regulated by master controller 15.
Antenna switcher 13 is connected with power amplifier 12, under the control of master controller 15, between multiple antennas 14, switches.As a nonrestrictive example, antenna switcher 13 can comprise multiple switches, and wherein respectively with one antenna 14 of each switch is connected.For example, can adopt the size variation of ultrahigh frequency PIN diode along with forward current If, the characteristic that action resistance R d changes thereupon realizes ultrahigh frequency on-off circuit.
Antenna 14 can be any one suitable antenna in prior art, and its band limits is 902MHz～928MHz, and its quantity can be 2,3,5, but is not limited to this.Master controller 15 transmits control signal to antenna switcher 13, thereby realizes selection and the switching of work antenna.
Master controller 15 is connected with read write line 11, power amplifier 12 and antenna switcher 13, can and read write line 11 between carry out information interaction, the amplification coefficient of regulating power amplifier 12 and control antenna switch 13 switch between multiple antennas 14.As a preferred embodiment, master controller 15 can adopt STM32F103 Series of MCU (MCU) to realize, and this serial microcontroller has the advantages such as speed is fast, hardware interface resources abundant, firmware development is convenient.Certainly, it will be appreciated by those skilled in the art that master controller 15 also can adopt other special or general-purpose devices with control function to realize.
External interface 16 is connected with master controller 15, and master controller 15 carries out communicating by letter of data and mutual via external interface 16 with the external world.External interface 16 externally provides unified interface, this unified interface can be various general or self-defining interfaces, such as USB interface, RS232 interface etc., therefore the external world reads or writes fashionable, can follow unified accordant interface agreement and realize, and without changing according to the change of read write line 11.
As a preferred embodiment, in master controller 15, can be configured to identify the model of read write line 11, and information translation external interface 16 being transmitted according to the model of current read write line 11 is converted to the read-write protocol of read write line 11 and matches, for example, the function of this identification and translation conversion can be configured in the firmware of master controller 15.Therefore, changing after read write line 11, master controller 15 can be identified the read write line 11 after replacing automatically, and the read-write protocol of the read write line 11 after this replacing is translated to conversion, and itself and unified external interface 16 are matched.
Certainly, user also can be configured and upgrade the firmware in master controller 15 by external interface 16, to change or to increase the model of the read write line 11 that master controller 15 can support.
In a concrete application scenarios, user can communicate by external interface 16 and master controller 15, and the amplification coefficient of power amplifier 12 is adjusted to suitable scope or numerical value, and control antenna switch 13 switches and uses a suitable antenna 14; Control afterwards read write line 11 and carry out the write operation of RFID electronic tag, in read write line 11 output, low power radiofrequency signal, this radiofrequency signal is (after amplifying, the signal power of output is for example 1～30W) after power amplifier 12 amplifies, and the antenna 14 of previously having selected via antenna switcher 13 transfers out.
To sum up, the ultrahigh frequency radio frequency identification (RFID) reader extension adapter tool of the present embodiment has the following advantages:
1, the read write line of existing single antenna can be adapted for to the read write line of many antennas;
2, can pass through the emissive power of power amplifier control antenna;
3, unified external interface protocol translation can be converted to multiple specific read write line agreement;
4, externally can provide a unified external interface, make inner read write line develop transparence for external item;
5, can realize customization function by external interface, for example, interface software upgrading, inner read write line software upgrading, the adjusting of antenna transmission power, switching selection, the command selection of read write line etc. of work antenna can be provided.
Although the present invention with preferred embodiment openly as above; but it is not for limiting the present invention; any those skilled in the art without departing from the spirit and scope of the present invention; can make possible variation and modification, therefore protection scope of the present invention should be as the criterion with the scope that the claims in the present invention were defined.

Claims (7)

1. a ultrahigh frequency radio frequency identification (RFID) reader extension adapter, is characterized in that, comprising:
Read write line;
The power amplifier being connected with described read write line;
The antenna switcher being connected with described power amplifier;
The multiple antennas that are connected with described antenna switcher, the band limits of described multiple antennas is 902MHz～928MHz;
The master controller being connected with described read write line, power amplifier and antenna switcher, for and described read write line carry out information interaction, regulate the amplification coefficient of described power amplifier and control described antenna switcher switching between described multiple antennas.
2. ultrahigh frequency radio frequency identification (RFID) reader extension adapter according to claim 1, is characterized in that, also comprises: with the external interface that described read write line is connected, described master controller carries out data interaction via described external interface and outside.
3. ultrahigh frequency radio frequency identification (RFID) reader extension adapter according to claim 1, is characterized in that, described power amplifier comprises class ab ammplifier.
4. ultrahigh frequency radio frequency identification (RFID) reader extension adapter according to claim 3, is characterized in that, described power amplifier also comprises the LC antiresonant circuit being connected with described class ab ammplifier.
5. ultrahigh frequency radio frequency identification (RFID) reader extension adapter according to claim 1, is characterized in that, the power of described power amplifier output is 1～30W in sending out.
6. ultrahigh frequency radio frequency identification (RFID) reader extension adapter according to claim 1, is characterized in that, described antenna switcher comprises multiple switches, and wherein each switch is connected with in described multiple antennas one respectively.
7. ultrahigh frequency radio frequency identification (RFID) reader extension adapter according to claim 1, is characterized in that, described master controller is STM32F103 Series of MCU.
CN201210426194.2A 2012-10-30 2012-10-30 Expansion adapter for ultrahigh-frequency FRID reader-writer Pending CN103793726A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104834956A (en) * 2015-04-30 2015-08-12 东莞电子科技大学电子信息工程研究院 Ultrahigh frequency and high frequency radio-frequency identification label and signal transmission method thereof
CN105868661A (en) * 2016-03-29 2016-08-17 南京欣威视通信息科技股份有限公司 RFID card reading apparatus and card reading method
WO2021174509A1 (en) * 2020-03-05 2021-09-10 Oppo广东移动通信有限公司 Radio frequency card reader and radio frequency identification method

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CN101140614A (en) * 2007-10-10 2008-03-12 上海坤锐电子科技有限公司 Protocol frequency and system thereof
CN101303736A (en) * 2007-05-08 2008-11-12 深圳市配天网络技术有限公司 Multi-protocol ultrahigh frequency reader-writer
CN101877070A (en) * 2009-12-24 2010-11-03 北京握奇智能科技有限公司 Non-contact IC card reader-writer and card searching method thereof
CN202025337U (en) * 2011-01-21 2011-11-02 中科院杭州射频识别技术研发中心 Ultrahigh frequency reader-writer based on ARM7
CN202995760U (en) * 2012-10-30 2013-06-12 上海阿法迪智能标签系统技术有限公司 Expansion adapter for ultrahigh frequency FRID reader-writer

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101303736A (en) * 2007-05-08 2008-11-12 深圳市配天网络技术有限公司 Multi-protocol ultrahigh frequency reader-writer
CN101140614A (en) * 2007-10-10 2008-03-12 上海坤锐电子科技有限公司 Protocol frequency and system thereof
CN101877070A (en) * 2009-12-24 2010-11-03 北京握奇智能科技有限公司 Non-contact IC card reader-writer and card searching method thereof
CN202025337U (en) * 2011-01-21 2011-11-02 中科院杭州射频识别技术研发中心 Ultrahigh frequency reader-writer based on ARM7
CN202995760U (en) * 2012-10-30 2013-06-12 上海阿法迪智能标签系统技术有限公司 Expansion adapter for ultrahigh frequency FRID reader-writer

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104834956A (en) * 2015-04-30 2015-08-12 东莞电子科技大学电子信息工程研究院 Ultrahigh frequency and high frequency radio-frequency identification label and signal transmission method thereof
CN104834956B (en) * 2015-04-30 2017-12-08 东莞电子科技大学电子信息工程研究院 A kind of hyperfrequency and high-frequency radio frequency identification label and its method for transmitting signals
CN105868661A (en) * 2016-03-29 2016-08-17 南京欣威视通信息科技股份有限公司 RFID card reading apparatus and card reading method
WO2021174509A1 (en) * 2020-03-05 2021-09-10 Oppo广东移动通信有限公司 Radio frequency card reader and radio frequency identification method

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Application publication date: 20140514