CN104112108A - Multi-frequency band RFID reading device and method - Google Patents
Multi-frequency band RFID reading device and method Download PDFInfo
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Abstract
The invention relates to a multi-frequency band RFID device and method. The device includes a control unit, a signal generation unit, an antenna unit, an LNA unit, a frequency mixer, a filter and a decoding unit; the control unit is connected with the signal generation unit and the decoding unit, the signal generation unit is connected with the frequency mixer and the antenna unit, the antenna unit is in line connection with the LNA unit and is wireless connection with an external RFID label, the LNA unit is connected with the frequency mixer, the frequency mixer is connected with the filter, and the filter is connected with the decoding unit. Compared with the prior art, the multi-frequency band RFID device in the invention can support multi-frequency band RFID reading, accurate RFID reading and remote reading can be achieved, and system expansion is simple, flexible and convenient.
Description
Technical field
The present invention relates to RFID reader technology field, particularly a kind of multiple-frequency band RFID reading device and method.
Background technology
Radio-frequency (RF) identification (Radio Frequency Identification, be called for short RFID) is a kind ofly to utilize radiofrequency signal to realize wireless messages by Space Coupling to communicate by letter.It is automatically identified destination object and is obtained target data by radio frequency signal, has quick, accurate, reliable feature.
Whether RFID label according to self-powered active electronic label and the passive electronic label of being divided into.Active electronic label can be operated in and initiatively send radiofrequency signal pattern or passive received RF signal pattern; And passive electronic label can only be operated under passive received RF signal pattern, because the electromagnetic wave energy that passive electronic label need to lean on RFID reader to produce carrys out work.Active electronic label has farther communication distance conventionally, better confidentiality; Passive electronic label has lightweight, low-cost advantage.Therefore active electronic label and passive electronic label exist simultaneously in the market.
Active electronic label can be divided into 433MHz, 900MHz, 2.45GHz, 5.8GHz according to frequency of operation; Passive electronic label can be divided into 125KHz, 133KHz, 13.56MHz, 27.12MHz, 433MHz, 900MHz according to working frequency range.
Wherein be operated in 125KHz and 133KHz and belong to low-frequency electronic label, the international standard relevant to low frequency tags has: ISO11784/11785 (for animal identification), ISO18000-2 (125-135KHz).Low-frequency electronic label is typically applied in animal identification, container identification, tool identification etc.
Wherein be operated in 13.56MHz and 27.12MHz and belong to medium-high frequency electronic tag, the international standard relevant to medium-high frequency label has: ISO14443, ISO15693, ISO18000-3 (13.56MHz).Medium-high frequency label is typically applied in electronic ticket, electronic ID card, access control etc.
Wherein be operated in 433MHz and 900MHz belongs to ultrahigh frequency electronic tag, the international standard relevant to ultrahigh-frequency tag has: ISO10374, ISO18000-6 (860-930MHz), ISO18000-7 (433.92MHz), ANSI NCITS256-1999 etc.
Wherein be operated in 2.4GHz and 5.8GHz and belong to microwave electron label, the international standard relevant to Microwave Tags has: ISO18000-4 (2.45GHz), ISO18000-5 (5.8GHz).Microwave Tags is generally active label, and other frequency range is generally passive label.
RFID label is generally only supported a kind of frequency range in above-mentioned, and traditional RFID reader is merely able to read a kind of RFID label of or two kinds of frequency ranges, at RFID, apply today more and more widely, this reader can not meet logistics, in transportation, adopt different RF ID label to read, the demand of management.If adopt traditional RFID reader, so for the RFID label of different frequency range, all need a corresponding reader corresponding with it, the application that is applied in Internet of Things of RFID will be restricted like this.
" multiple-frequency band RFID read write line and reading/writing method thereof " disclosed in Chinese patent CN201210116820.8, its major technique is to have realized " multi-frequency band radio-frequency antenna ", the antenna sets of at least two different frequency ranges is combined, by " radio frequency selection module ", carrys out the radiofrequency signal of different frequency range to be delivered to " the radio frequency processing module " of different frequency range.This scheme principal feature is that the antenna sets different frequency range is combined on antenna, the physical size of multiband read write line is diminished, but in " radio frequency processing module ", still need " RF processing units of at least two different frequency ranges " pre-service such as the signal demodulation of " RF processing unit of different frequency range " responsible different frequency range, filtering.Therefore still complicated aspect radio frequency processing, processing unit can increase along with the increase of band support.
In existing multiple-frequency band RFID fetch equipment, the fetch equipment that several frequency ranges of handlebar are single carries out simple module level combination and realizes and support reading of multiple band RFID label, and this implementation exists antenna many, and module is many, the shortcoming that power consumption is large.Also the antenna of the multiple frequency range of handlebar merges on an Anneta module in addition, by frequency, judge to distinguish the RFID label of different frequency range, thereby the decoding unit of delivering to respectively different frequency range is decoded, this implementation has solved the many problems of antenna, but because there is the decoding unit of a plurality of frequency ranges equally, still do not solve the problem that module number is many.Above two kinds of implementations all exist different frequency range to need the problem of different decoding units, the decoding frequency range for example needing is increased to 4 by 2, decoding unit correspondence will be increased to 4 from 2 so, the increase that has brought module number on the one hand, cause on the other hand the product can not be flexibly in site of deployment adjustment, if according to optimization configuring product, increased the kind of product, if be all to maximize configuring product, can make product price increase.
In existing multiple-frequency band RFID fetch equipment, when the RFID label to two kinds of different frequency ranges reads, there is the different frequency range label different problem of decipherment distance farthest, although can alleviate by adjusting the link gain of different frequency range the problem of decipherment distance, but the gain adjustment of multilink has increased cost of products on the one hand, on the other hand because the independence of decoding unit causes being difficult to find an identical equilibrium point that reads distance of different frequency range.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of can reading by a plurality of band RFIDs of support, and RFID reads accurately and can read at a distance RFID reading device and method that system extension is simple, flexible.
The technical scheme that the present invention solves the problems of the technologies described above is as follows: a kind of multiple-frequency band RFID reading device, comprises control module, signal generation unit, antenna element, LNA unit, frequency mixer, wave filter and decoding unit;
Described control module, it is connected with described signal generation unit, decoding unit respectively, for sequentially sending the instruction of different frequency range Card Reader to signal generation unit and sending current configuration frequency range and protocol information to decoding unit;
Described signal generation unit, it is connected with described frequency mixer respectively, antenna element connects, and for produce RFID label Card Reader signal according to the instruction of different frequency range Card Reader, to antenna element, sends Card Reader signal, to frequency mixer, sends local oscillation signal;
Described antenna element, it is connected with LNA unit line respectively, the wireless connections of external RF ID label, for receiving the return signal of the RFID label of external RF ID label transmission, sends external RF ID label return signal to LNA unit;
Described LNA unit, it is connected with frequency mixer, for the RFID label return signal of antenna element is carried out to dynamic gain amplification, and sends the RFID label return signal after amplifying to frequency mixer;
Described frequency mixer, it is connected with wave filter, carries out mixing, and the signal after mixing is sent to wave filter for the return signal of the RFID label by the Card Reader signal of signal generation unit and after amplifying;
Described wave filter, itself and decoding unit, for the signal beyond this filter bandwidht of filtering and all signals outside suppressing bandwidth, send to respectively decoding unit by the signal after filtering;
Described decoding unit, the frequency range and the protocol information that for the signal after filtering according to wave filter and control module, provide are decoded, and to control module, send decoded signal to external unit output label.
Further technical scheme, described wave filter is bandpass filter.
Further technical scheme, described signal generation unit is connected by PA unit with described antenna element, and described PA unit, for the gain of RFID label Card Reader signal dynamics is amplified, sends the RFID label Card Reader signal after dynamic gain amplification to antenna element.
Further technical scheme, also connects by clock recovery unit between described wave filter and decoding unit, and described clock recovery unit is used for recovering the clock from RFID label according to the signal after filtering, and sends recovered clock signal to decoding unit.
A RFID read method, comprises the following steps:
Step S1: control module sequentially sends the instruction of different frequency range Card Reader and sends current configuration frequency range and protocol information to decoding unit to signal generation unit;
Step S2: signal generation unit produces RFID label Card Reader signal according to the instruction of different frequency range Card Reader, sends Card Reader signal to antenna element, sends local oscillation signal to frequency mixer;
Step S3: antenna element receives the return signal of the RFID label of external RF ID label transmission, sends the return signal of external RF ID label to LNA;
Step S4:LNA unit carries out dynamic gain amplification by the return signal of RFID label, and to frequency mixer, sends the return signal of the RFID label after amplifying;
Step S5: the return signal of the RFID label of frequency mixer by the local oscillation signal of signal generation unit and after amplifying is carried out mixing, and the signal after mixing is sent to wave filter;
Step S6: the signal beyond this filter bandwidht of wave filter filtering and all signals outside suppressing bandwidth, send to respectively decoding unit and clock recovery unit by the signal after filtering;
Step S7: frequency range and protocol information that the signal after decoding unit filters according to wave filter and control module provide are decoded, to control module transmission decoded signal and to external unit output label signal.
Further technical scheme, when described frequency mixer reads the label return signal of low-frequency range, frequency mixer, by the intermediate-freuqncy signal mixing of the label return signal of low-frequency range and signal generation unit, obtains intermediate-freuqncy signal, then label return signal is moved to Mid Frequency;
When described frequency mixer reads the label return signal of high band, frequency mixer, by the high-frequency signal mixing of the label return signal of high band and signal generation unit, obtains intermediate-freuqncy signal, then label return signal is moved to Mid Frequency;
When described frequency mixer reads the label return signal of hyper band, frequency mixer, by the ultra-high frequency signal mixing of the label return signal of hyper band and signal generation unit, obtains intermediate-freuqncy signal, then label return signal is moved to Mid Frequency;
When described frequency mixer reads the label return signal of microwave section, frequency mixer, by the microwave frequency band signal mixing of the microwave frequency band signal of label return signal and signal generation unit, obtains intermediate-freuqncy signal, then label return signal is moved to intermediate frequency.
Further technical scheme, described wave filter is dynamically adjusted filtering bandwidth according to the data communication bandwidth of RFID protocol requirement, and wave filter is dynamically adjusted filter order according to the Out-of-band rejection of RFID protocol requirement simultaneously.
The invention has the beneficial effects as follows:
1, different frequency range RFID label is read in the support of multiple-frequency band RFID reading device, but system module number is constant, has reduced production cost;
2, change filtering exponent number and the gain of wave filter, can make in different frequency range RFID tag read distance consistent;
3, RFID label return signal is carried out frequency spectrum shift, and different frequency range RFID label return signal is moved on a relatively narrow fixedly frequency, facilitates wave filter and the unification of follow-up unit to unify to process to the label return path signal of different frequency range;
4, the signal of wave filter beyond can this filter bandwidht of filtering, thus each reader phase mutual interference avoided;
5, clock recovery unit is in two-forty RFID communication protocol, make decode clock consistent with the working clock frequency of RFID label, or phase place is consistent, also or frequency all consistent with phase place, improve it and be correctly decoded the ability of label data, improve the sensitivity of system Card Reader, under identical output power, improved Card Reader distance;
6, in Internet of things system, realized the reading of different RF ID label, improved logistics transportation, handling of goods and materials, the efficiency of the aspects such as asset management;
7, can be according to the RFID label frequency range that needs flexible configuration to support of site of deployment, by the adaptability changed information of control module, system extension is simple, flexible, reading device wide adaptability.
Accompanying drawing explanation
Fig. 1 is a kind of multiple-frequency band RFID reading device of the present invention module frame chart;
Fig. 2 is that a kind of multiple-frequency band RFID reading device of the present invention is implemented module frame chart;
Fig. 3 is that a kind of multiple-frequency band RFID reading device of the present invention is implemented module frame chart;
Fig. 4 is that a kind of multiple-frequency band RFID reading device of the present invention is implemented module frame chart;
Fig. 5 is a kind of multiple-frequency band RFID read method of the present invention process flow diagram.
Embodiment
Below in conjunction with accompanying drawing, principle of the present invention and feature are described, example, only for explaining the present invention, is not intended to limit scope of the present invention.
As shown in Figures 1 to 4, a kind of multiple-frequency band RFID reading device, comprises control module 101, signal generation unit 102, antenna element 104, LNA unit 105, frequency mixer 106, wave filter 107 and decoding unit 109;
Described control module 101, it is connected with described signal generation unit 102, decoding unit 109 respectively, for sending the instruction of different frequency range Card Reader and send current configuration frequency range and protocol information to decoding unit 109 to signal generation unit 102 orders;
Described signal generation unit 102, it is connected with described antenna element 104, frequency mixer 106 respectively, for produce RFID label Card Reader signal according to the instruction of different frequency range Card Reader, to antenna element 104, sends Card Reader signal, to frequency mixer 103, sends local oscillation signal;
Described antenna element 104, its respectively with LNA unit 105 connections, the wireless connections of external RF ID label, for receiving the return signal of the RFID label that external RF ID label sends, to LNA unit, 105 send external RF ID label return signals;
Described LNA unit 105, it is connected with frequency mixer 106, for the RFID label return signal of antenna element 104 is carried out to dynamic gain amplification, and the RFID label return signal sending after amplifying to frequency mixer 106;
Described frequency mixer 106, it is connected with wave filter 107, carries out mixing, and the signal after mixing is sent to wave filter 107 for the return signal of the RFID label by the Card Reader signal of signal generation unit 102 and after amplifying;
Described wave filter 107, itself and decoding unit 109, for the signal beyond these wave filter 107 bandwidth of filtering and all signals outside suppressing bandwidth, send to respectively decoding unit 109 by the signal after filtering;
Described decoding unit 109, the frequency range and the protocol information that for the signal after filtering according to wave filter 107 and control module 101, provide are decoded, and to control module 101, send decoded signals to external unit output label.
Described wave filter 104 is bandpass filter.
Described signal generation unit 102 is connected by PA unit 103 with described antenna element 104, and described PA unit 103, for the gain of RFID label Card Reader signal dynamics is amplified, sends the RFID label Card Reader signal after dynamic gain amplifies to antenna element 101.
Between described wave filter 107 and decoding unit 109, also by clock recovery unit 108, connect, described clock recovery unit 108 is for recovering the clock from RFID label according to the signal after filtering, and sends recovered clock signals to decoding unit 109.
As shown in Figure 5, a kind of RFID read method, comprises the following steps:
Step S1: control module 101 sends the instruction of different frequency range Card Reader and sends current configuration frequency range and protocol information to decoding unit 109 to signal generation unit 102 orders;
Step S2: signal generation unit 102 produces RFID label Card Reader signal according to the instruction of different frequency range Card Reader, sends Card Reader signal to antenna element 104, sends local oscillation signal to frequency mixer 106;
Step S3: antenna element 104 receives the return signal of the RFID label of external RF ID label transmission, the return signal of 105 transmission external RF ID labels to LNA unit;
Step S4:LNA unit 105 carries out dynamic gain amplification by the return signal of RFID label, and to frequency mixer 106, sends the return signal of the RFID label after amplifying;
Step S5: the return signal of the RFID label of frequency mixer 106 by the local oscillation signal of signal generation unit 102 and after amplifying is carried out mixing, and the signal after mixing is sent to wave filter 107;
Step S6: the signal beyond these wave filter 107 bandwidth of wave filter 107 filterings and all signals outside suppressing bandwidth, send to respectively decoding unit 109 by the signal after filtering;
Step S7: frequency range and protocol information that the signal after decoding unit 109 filters according to wave filter and control module 101 provide are decoded, to control module 101 transmission decoded signals and to external unit output label signal.
When described frequency mixer 106 reads the label return signal of low-frequency range, frequency mixer 106, by the intermediate-freuqncy signal mixing of the label return signal of low-frequency range and signal generation unit, obtains intermediate-freuqncy signal, then label return signal is moved to Mid Frequency;
When described frequency mixer 106 reads the label return signal of high band, frequency mixer 106, by the high-frequency signal mixing of the label return signal of high band and signal generation unit 102, obtains intermediate-freuqncy signal, then label return signal is moved to Mid Frequency;
When described frequency mixer 106 reads the label return signal of hyper band, frequency mixer 106, by the ultra-high frequency signal mixing of the label return signal of hyper band and signal generation unit 102, obtains intermediate-freuqncy signal, then label return signal is moved to Mid Frequency;
When described frequency mixer 106 reads the label return signal of microwave section, frequency mixer 106, by the microwave frequency band signal mixing of the microwave frequency band signal of label return signal and signal generation unit 102, obtains intermediate-freuqncy signal, then label return signal is moved to intermediate frequency.
Described wave filter 104 is dynamically adjusted filtering bandwidth according to the data communication bandwidth of RFID protocol requirement, and wave filter 104 is dynamically adjusted filter order according to the Out-of-band rejection of RFID protocol requirement simultaneously.
Embodiment 1: as shown in Figure 2, first control module 101 reads low frequency tags instruction, and control module 101 is given signal generation unit 102, thereby makes signal generation unit 102 produce corresponding low frequency reading tag card signal; Control module 101 notice decoding units 109, prepare according to low frequency tags agreement, return signal to be decoded.
Signal generation unit 102 produces low frequency Card Reader signal, for example continuous wave signal of 125KHz on the one hand according to the Card Reader instruction of control module 101; The low frequency Card Reader signal producing is given PA unit 103 and is carried out power amplification; Signal generation unit 102 produces an intermediate-freuqncy signal simultaneously, and for the return signal of label is carried out to mixing, this intermediate-freuqncy signal can be 5MHz.
103 pairs of PA unit Card Reader signal carries out power amplification, and the gain of this PA unit 103 can dynamically be adjusted according to the decoded result of control module 101 or decoding unit 109, also can make the gain of PA unit 103 fix; Low frequency Card Reader signal after 103 power amplifications of PA unit is delivered to antenna element 104.
The low frequency Card Reader signal of coming in 104 pairs of PA unit 103 of antenna element is launched, and the low frequency RF ID label within the scope of aerial radiation is received after the emittance of sufficient intensity, is correctly decoded out after Card Reader instruction retro-reflective label id information; Antenna element 104, after receiving label ID information, is given LNA unit 105 and is amplified; Described antenna element 104 can be that emitting antenna and receiving antenna are an antenna, can be also that emitting antenna and receiving antenna are independent.
LNA unit 105 amplifies the label return path signal receiving from antenna element 104, and the gain of this LNA unit 105 can dynamically be adjusted according to the decoded result of control module 101 or decoding unit 109, also can make the gain of LNA unit 105 fix.The label return path signal amplifying through LNA unit 105 is as a frequency input of frequency mixer 106.
Label return path signal after 106 pairs of one side of frequency mixer are amplified from LNA unit 105, on the other hand from the intermediate-freuqncy signal of signal generation unit 102, and carries out mixing to these two signals; The gain of this frequency mixer 106 can dynamically be adjusted according to the decoded result of control module 101 or decoding unit 109, also can make the gain of frequency mixer 106 fix; After frequency mixer 106, there is frequency spectrum shift in label return signal, and the label return signal after frequency spectrum shift outputs to wave filter 107.
107 pairs, the wave filter label return signal after frequency spectrum shift is carried out filtering, described wave filter 107 is bandpass filter, its center frequency point is fixed, but can be corresponding with the intermediate-freuqncy signal that signal generation unit 102 produces, the intermediate-freuqncy signal producing such as signal generation unit is 5MHz, and wave filter 104 center frequency point so are here 5MHz; The bandwidth of described wave filter can dynamically change according to the agreement of supporting according to the decoded result of decoding unit 109, and such as 125KHz low frequency tags, while observing ISO18000-2 agreement, its filter bandwidht maximum is 5KHz; Label return signal after filtering sends to clock recovery unit 108, also sends to decoding unit 109 simultaneously.
The label return signal that 108 pairs of wave filters 107 of clock recovery unit are sent here, carries out the clock recovery of label card; It is pointed out that clock recovery unit 108 is when supported protocol data transfer rate is low, can be only according to the clock of reader, can be correctly decoded; Such as 125KHz low frequency tags, while observing ISO18000-2 agreement, because message transmission rate is 1～5Kbps, at this moment clock recovery unit 108 can quit work or omit this unit; Described clock recovery unit 108 is when reading ultrahigh-frequency tag, and clock recovery unit 108 must operation.
The label return signal that 109 pairs of wave filters 107 of decoding unit are sent here, and the label card clock signal that clock recovery unit 108 recovers is carried out the decoding of label card; It is pointed out that when current protocol data transfer rate is low, can directly by reader local clock, be decoded; Decoded signal is label card return message, comprises No. ID, label etc.The output of decoding unit 109 can be connected to the main control units such as PC.
Embodiment 2: as shown in Figure 3, antenna element 104 is operated in accepting state always, after receiving the id information that Microwave Tags (active) 214 initiatively sends, give LNA unit 105 and amplify.
LNA unit 105 amplifies the label return signal receiving from antenna element 104, and the gain of this LNA unit 105 can dynamically be adjusted according to the decoded result of control module 101 or decoding unit 109, also can make the gain of LNA unit 105 fix; The label return path signal amplifying through LNA unit 105 is as a frequency input of frequency mixer 106.
Label return path signal after 106 pairs, frequency mixer amplifies from LNA unit 105 and carry out mixing from the microwave signal of signal generation unit 102; The gain of this frequency mixer 106 can dynamically be adjusted according to the decoded result of control module 101 or decoding unit 109, also can make the gain of frequency mixer 106 fix; After frequency mixer 106, there is frequency spectrum shift in label return path signal, and the label return signal after frequency spectrum shift outputs to wave filter 107.
107 pairs, the wave filter label return signal after frequency spectrum shift is carried out filtering, described wave filter 107 is bandpass filter, its center frequency point is fixed, but can be corresponding with microwave signal and label frequency return signal that signal generation unit 102 produces, the microwave signal frequency producing such as signal generation unit is 2440MHz, label return signal centre frequency is 2450MHz, and wave filter 107 center frequency point so are here 2450-2440=10MHz; The bandwidth of described wave filter can dynamically change according to the agreement of supporting according to the decoded result of decoding unit 109, and such as 2450MHz Microwave Tags, while observing ISO18000-4 agreement, its filter bandwidht maximum is 5MHz.Label return signal after filtering sends clock recovery unit 108 to, also sends decoding unit 109 simultaneously to.
The label return signal that 108 pairs of wave filters 107 of clock recovery unit are sent here, carries out the clock recovery of label card.
The label return signal that 109 pairs of wave filters 107 of decoding unit are sent here, and the label card clock signal that clock recovery unit 108 recovers is carried out the decoding of label card; It is pointed out that when current protocol data transfer rate is low, can directly by reader local clock, be decoded; Decoded signal is label card return message, comprises No. ID, label etc.The output of decoding unit 109 can be connected to the main control units such as PC.
Embodiment 3: as shown in Figure 4, first control module 101 reads ultrahigh-frequency tag order, gives signal generation unit 102, thereby make signal generation unit 102 produce corresponding ultrahigh frequency reading tag card signal; Control module 101 is notified decoding unit 109 simultaneously, prepares according to ultrahigh-frequency tag agreement, return signal to be decoded.
According to control module, 101 instructions produce ultrahigh frequency Card Reader signal, for example the ASK modulation signal of 900MHz to signal generation unit 102; The ultrahigh frequency Card Reader signal producing is given PA unit 103 and is carried out power amplification; Signal generation unit 102 produces another ultra-high frequency signal simultaneously, for the signal that label is returned, carries out mixing, and this ultra-high frequency signal can be 790MHz.
103 pairs of PA unit Card Reader signal carries out power amplification, and the gain of this PA unit 103 can dynamically be adjusted according to the decoded result of control module 107 or decoding unit 106, also can make the gain of PA unit 103 fix; Ultrahigh frequency reading tag card signal after 103 power amplifications of PA unit is delivered to antenna element 104.
The ultrahigh frequency Card Reader signal of coming in 104 pairs of PA unit 103 of antenna element is launched, and the ultra-high frequency RFID label within the scope of aerial radiation is received after the emittance of sufficient intensity, is correctly decoded out after Card Reader instruction retro-reflective label id information; Antenna element 104, after receiving label ID information, is given LNA unit 105 and is amplified.Described antenna element 104 can be that emitting antenna and receiving antenna are an antenna, can be also that emitting antenna and receiving antenna are independent.
LNA unit 105 amplifies the label return path signal receiving from antenna element 104, and the gain of this LNA unit 105 can dynamically be adjusted according to the decoded result of control module 104 or decoding unit 109, also can make the gain of LNA unit 105 fix.The label return path signal amplifying through LNA unit 105 is as a frequency input of frequency mixer 106.
Label return path signal after 106 pairs of one side of frequency mixer are amplified from LNA unit 105, on the other hand from the ultra-high frequency signal of signal generation unit 102, and carries out mixing to these two signals; The gain of this frequency mixer 106 can dynamically be adjusted according to the decoded result of control module 101 or decoding unit 109, also can make the gain of frequency mixer 106 fix; After frequency mixer 106, there is frequency spectrum shift in label return path signal, and the label return signal after frequency spectrum shift outputs to wave filter 107.
107 pairs, the wave filter label return signal after frequency spectrum shift is carried out filtering, described wave filter 107 is a bandpass filter, its center frequency point is fixed, but the frequency that the ultra-high frequency signal that can produce with signal generation unit 108 and label return is corresponding, the ultra-high frequency signal producing such as signal generation unit 102 is 790MHz, the center frequency point that label card returns is 900MHz, and wave filter 107 center frequency point so are here 900-790=110MHz.The bandwidth of described wave filter can be according to the decoded result of decoding unit 109, according to the agreement of supporting, dynamically change, such as 900MHz ultrahigh-frequency tag, while observing ISO18000-6C agreement, its filter bandwidht maximum is 640KHz. label return signal after filtering and gives second level frequency mixer 113.
The label return path signal that 113 pairs of first order wave filters of frequency mixer 107 send, and from the high-frequency signal of signal generation unit 102, and these two signals are carried out to mixing; The gain of this frequency mixer 106 can dynamically be adjusted according to the decoded result of control module 101 or decoding unit 109, also can make the gain of frequency mixer 113 fix.After frequency mixer 113, there is frequency spectrum shift in label return path signal, and the label return signal after frequency spectrum shift outputs to second level wave filter 114.
114 pairs, the wave filter label return signal after frequency spectrum shift is carried out filtering, described wave filter 114 is bandpass filter, its center frequency point is fixed, but the centre frequency of exporting after the high-frequency signal that can produce with signal generation unit 102 and first order mixing is corresponding, the high-frequency signal producing such as signal generation unit 102 is 100MHz, the center frequency point of exporting after first order mixing is 110MHz, and wave filter 114 center frequency point so are here 110-100=10MHz.The bandwidth of described wave filter can be according to the decoded result of decoding unit 109, according to the agreement of supporting, dynamically change, such as 900MHz ultrahigh-frequency tag, while observing ISO18000-6C agreement, its filter bandwidht maximum is 640KHz. label return signal after filtering and sends clock recovery unit 108 to, also sends decoding unit 109 simultaneously to.
The label return signal that 108 pairs of wave filters 114 of clock recovery unit are sent here, carries out the clock recovery of label card; It may be noted that time, clock recovery unit 108, when supported protocol data transfer rate is low, can be only can be correctly decoded according to the clock of reader.
The label return signal that 108 pairs of wave filters 114 of decoding unit are sent here, and the label card clock signal that clock recovery unit 108 recovers is carried out the decoding of label card; When current protocol data transfer rate is low, can directly by reader local clock, be decoded; Decoded signal is label card return message, comprises No. ID, label etc.; The output of decoding unit 108 can be connected to the main control units such as PC.
The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (7)
1. a multiple-frequency band RFID reading device, is characterized in that: comprise control module (101), signal generation unit (102), antenna element (104), LNA unit (105), frequency mixer (106), wave filter (107) and decoding unit (109);
Described control module (101), it is connected with described signal generation unit (102), decoding unit (108) respectively, for sending the instruction of different frequency range Card Reader and send current configuration frequency range and protocol information to decoding unit (109) to signal generation unit (102) order;
Described signal generation unit (102), it is connected with described frequency mixer (106) respectively, antenna element (104) connects, for produce RFID label Card Reader signal according to the instruction of different frequency range Card Reader, to antenna element (104), send Card Reader signal, to frequency mixer (103), send local oscillation signal;
Described antenna element (104), its respectively with LNA unit (105) connection, the wireless connections of external RF ID label, for receiving the return signal of the RFID label of external RF ID label transmission, to LNA unit (105), send external RF ID label return signal;
Described LNA unit (105), it is connected with frequency mixer (106), for the RFID label return signal of antenna element (104) is carried out to dynamic gain amplification, and sends the RFID label return signal after amplifying to frequency mixer (106);
Described frequency mixer (106), it is connected with wave filter (107), return signal for the RFID label by the Card Reader signal of signal generation unit (102) and after amplifying is carried out mixing, and the signal after mixing is sent to wave filter (107);
Described wave filter (107), itself and decoding unit (109), for the signal beyond this wave filter of filtering (107) bandwidth and all signals outside suppressing bandwidth, send to respectively decoding unit (109) by the signal after filtering;
Described decoding unit (109), the frequency range and the protocol information that for the signal after filtering according to wave filter (107) and control module (101), provide are decoded, and to control module (101), send decoded signal to external unit output label.
2. a kind of multiple-frequency band RFID reading device according to claim 1, is characterized in that: described wave filter (104) is bandpass filter.
3. a kind of multiple-frequency band RFID reading device according to claim 1, it is characterized in that: described signal generation unit (102) is connected by PA unit (103) with described antenna element (104), described PA unit (103), for the gain of RFID label Card Reader signal dynamics is amplified, sends the RFID label Card Reader signal after dynamic gain amplifies to antenna element (101).
4. a kind of multiple-frequency band RFID reading device according to claim 1, it is characterized in that: between described wave filter (107) and decoding unit (109), also by clock recovery unit (108), connect, described clock recovery unit (108) is for recovering the clock from RFID label according to the signal after filtering, and sends recovered clock signal to decoding unit (109).
5. a multiple-frequency band RFID read method, is characterized in that: comprise the following steps:
Step S1: control module (101) sends the instruction of different frequency range Card Reader and sends current configuration frequency range and protocol information to decoding unit (109) to signal generation unit (102) order;
Step S2: signal generation unit (102) produces RFID label Card Reader signal according to the instruction of different frequency range Card Reader, sends Card Reader signal to antenna element (101), sends local oscillation signal to frequency mixer (106);
Step S3: antenna element (104) receives the return signal of the RFID label of external RF ID label transmission, sends the return signal of external RF ID label to LNA unit (105);
Step S4:LNA unit (105) carries out dynamic gain amplification by the return signal of RFID label, and to frequency mixer (106), sends the return signal of the RFID label after amplifying;
Step S5: the return signal of the RFID label of frequency mixer (106) by the local oscillation signal of signal generation unit (102) and after amplifying is carried out mixing, and the signal after mixing is sent to wave filter (107);
Step S6: the signal beyond wave filter (107) this wave filter of filtering (107) bandwidth and all signals outside suppressing bandwidth, send to respectively decoding unit (109) by the signal after filtering;
Step S7: frequency range and protocol information that the signal after decoding unit (109) filters according to wave filter and control module (101) provide are decoded, to control module (101) transmission decoded signal and to external unit output label signal.
6. a kind of multiple-frequency band RFID read method according to claim 5, it is characterized in that: when described frequency mixer (106) reads the label return signal of low-frequency range, frequency mixer (106) is by the intermediate-freuqncy signal mixing of the label return signal of low-frequency range and signal generation unit, obtain intermediate-freuqncy signal, then label return signal is moved to Mid Frequency;
When described frequency mixer (106) reads the label return signal of high band, frequency mixer (106) is by the high-frequency signal mixing of the label return signal of high band and signal generation unit (102), obtain intermediate-freuqncy signal, then label return signal is moved to Mid Frequency;
When described frequency mixer (106) reads the label return signal of hyper band, frequency mixer (106) is by the ultra-high frequency signal mixing of the label return signal of hyper band and signal generation unit (102), obtain intermediate-freuqncy signal, then label return signal is moved to Mid Frequency;
When described frequency mixer (106) reads the label return signal of microwave section, frequency mixer (106) is by the microwave frequency band signal mixing of the microwave frequency band signal of label return signal and signal generation unit (102), obtain intermediate-freuqncy signal, then label return signal is moved to intermediate frequency.
7. a kind of multiple-frequency band RFID read method according to claim 5, it is characterized in that: described wave filter (104) is dynamically adjusted filtering bandwidth according to the data communication bandwidth of RFID protocol requirement, wave filter (104) is dynamically adjusted filter order according to the Out-of-band rejection of RFID protocol requirement simultaneously.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104717036A (en) * | 2015-03-01 | 2015-06-17 | 深圳中科讯联科技有限公司 | Differential Manchester decoding circuit and system |
| CN108280382A (en) * | 2018-03-19 | 2018-07-13 | 深圳供电局有限公司 | A kind of detecting devices of recognizable multiple types electronic tag |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070111697A1 (en) * | 2005-11-15 | 2007-05-17 | Bellantoni John V | Configurable homodyne/heterodyne radio receiver and RFID reader employing same |
| CN101441709A (en) * | 2008-12-25 | 2009-05-27 | 沈阳三阳电子标签有限公司 | Multiple-frequency band RFID intelligent read-write device and control method thereof |
| WO2009113015A2 (en) * | 2008-03-10 | 2009-09-17 | Nxp B.V. | Data processing system |
| CN101888256A (en) * | 2010-04-01 | 2010-11-17 | 华东师范大学 | Multi-mode multi-frequency multi-application direct frequency conversion wireless transceiver |
| CN102291088A (en) * | 2011-07-25 | 2011-12-21 | 无锡里外半导体科技有限公司 | Receiver mixer |
-
2014
- 2014-06-30 CN CN201410309792.0A patent/CN104112108A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070111697A1 (en) * | 2005-11-15 | 2007-05-17 | Bellantoni John V | Configurable homodyne/heterodyne radio receiver and RFID reader employing same |
| WO2009113015A2 (en) * | 2008-03-10 | 2009-09-17 | Nxp B.V. | Data processing system |
| CN101441709A (en) * | 2008-12-25 | 2009-05-27 | 沈阳三阳电子标签有限公司 | Multiple-frequency band RFID intelligent read-write device and control method thereof |
| CN101888256A (en) * | 2010-04-01 | 2010-11-17 | 华东师范大学 | Multi-mode multi-frequency multi-application direct frequency conversion wireless transceiver |
| CN102291088A (en) * | 2011-07-25 | 2011-12-21 | 无锡里外半导体科技有限公司 | Receiver mixer |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104717036A (en) * | 2015-03-01 | 2015-06-17 | 深圳中科讯联科技有限公司 | Differential Manchester decoding circuit and system |
| CN104717036B (en) * | 2015-03-01 | 2018-06-19 | 深圳中科讯联科技有限公司 | A kind of Difference Manchester decoding circuit and decoding system |
| CN108280382A (en) * | 2018-03-19 | 2018-07-13 | 深圳供电局有限公司 | A kind of detecting devices of recognizable multiple types electronic tag |
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