CN103793726A - Expansion adapter for ultrahigh-frequency FRID reader-writer - Google Patents
Expansion adapter for ultrahigh-frequency FRID reader-writer Download PDFInfo
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- 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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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
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.
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.
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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210426194.2A CN103793726A (en) | 2012-10-30 | 2012-10-30 | Expansion adapter for ultrahigh-frequency FRID reader-writer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210426194.2A CN103793726A (en) | 2012-10-30 | 2012-10-30 | Expansion adapter for ultrahigh-frequency FRID reader-writer |
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| Publication Number | Publication Date |
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| CN103793726A true CN103793726A (en) | 2014-05-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201210426194.2A Pending CN103793726A (en) | 2012-10-30 | 2012-10-30 | Expansion adapter for ultrahigh-frequency FRID reader-writer |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
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| 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 |