CN202196417U - Radio frequency identification reader module - Google Patents
Radio frequency identification reader module Download PDFInfo
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- CN202196417U CN202196417U CN2011201677798U CN201120167779U CN202196417U CN 202196417 U CN202196417 U CN 202196417U CN 2011201677798 U CN2011201677798 U CN 2011201677798U CN 201120167779 U CN201120167779 U CN 201120167779U CN 202196417 U CN202196417 U CN 202196417U
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Abstract
The utility model discloses a radio frequency identification reader module which comprises a communication control unit, a radio frequency signal receiving unit and a radio frequency signal sending unit. The radio frequency signal receiving unit further comprises a time sharing quadrature receiving circuit receiving circuit which is used for quadrature-demodulating electronic label signals received on a reception main link in a time sharing manner and outputting base-band difference signals after demodulation. The radio frequency identification reader module allows the reception demodulation mode of the electronic label signals to be improved, allows blind areas to be minimized, enables a coverage scope to be increased, enables the area occupied by a device to be reduced, and enables the cost of an RFID hand-held reading device to be substantially reduced.
Description
Technical field
The utility model relates to the REID field, relates in particular to a kind of radio-frequency identification reader module.
Background technology
RFID (Radio Frequency Identification; RF identification) technology is a kind of noncontact tag information discriminating technology; Rfid system mainly is made up of reader, electronic tag and antenna, and it utilizes wireless radio frequency mode to carry out the noncontact bidirectional data communication, reaches the purpose of recognition objective; Identification work need not manual intervention, can work in various environment.
The ultrahigh frequency RFID reader of prior art generally is divided into two kinds: a kind of is fixed reader, and another kind is a handheld reader.Stationary structure is complicated, costs an arm and a leg, and is used for remote read-write operation, uses inconvenience very; Portable equipment, simple to operate, convenient portable; Practicality is widely arranged, but because problem such as size, that has limited hand held readers checks performance and stability; Particularly under the small size situation, general in order to control the area of veneer, adopt single channel demodulated received mode usually; In use there is the blind area unavoidably, greatly reduces the performance of hand held readers.The essential reason that performance descends is the problem of reader module receiving demodulation method.The method of reseptance of receiving circuit is the core of reader module; And the small size reader module is the important component part of hand held readers; Therefore, under the prerequisite that guarantees size, the method for reseptance that how to improve receiving circuit is the subject matter that hand held readers faces at present.
The utility model content
The technical matters that the utility model solves provides a kind of radio-frequency identification reader module, improves the receiving demodulation performance of hand held readers module identification label.
For solving the problems of the technologies described above, the utility model provides a kind of radio-frequency identification reader module, comprises communication control unit, radiofrequency signal receiving element and radiofrequency signal transmitting element, wherein,
Said radiofrequency signal receiving element further comprises timesharing quadrature demodulation receiving circuit; Said timesharing quadrature demodulation receiving circuit is used for; Carry out timesharing IQ quadrature demodulation to receiving the electronic tag signal that receives on the primary link, and the differential baseband signal after the output demodulation.
In addition, said timesharing quadrature demodulation receiving circuit comprises on the reception primary link: 0 ° of straight-forward network and 90 ° of phase shift networks,
Said communication control unit switches said 0 ° of straight-forward network and 90 ° of phase shift networks through timesharing, makes two different branches and demodulates next signal in orthogonal constantly, thereby realize timesharing IQ quadrature demodulation.
In addition, said 90 ° of phase shift networks comprise: RF switch and 90 ° of phase shift network passages;
Said 0 ° of straight-forward network comprises: RF switch and 0 ° of passage;
Said communication control unit is through control said RF switch, the said 90 ° of phase shift networks of gating or the said 0 ° of straight-forward network of gating.
In addition, said 90 ° of phase shift network passages are made up of microstrip line, inductance and electric capacity.
In addition, said timesharing quadrature demodulation receiving circuit also comprises two phase shift network electric bridges and two down-conversion mixers;
Said 90 ° of phase shift networks link to each other with said two phase shift network electric bridges and down-conversion mixer through RF switch respectively with 0 ° of straight-forward network;
One end of said phase shift network electric bridge produces 90 ° of phase shifts, and the other end is 0 ° of straight-through end; Said down-conversion mixer is used for radio frequency receiving signal and local local oscillation signal mixing, and the baseband signal of output difference.
In addition, said radiofrequency signal receiving element also comprises the reception baseband processing unit, and said reception baseband processing unit further comprises: filter network, differential amplifier and comparer;
Said filter network, differential amplifier and comparer are respectively applied for, and the differential baseband signal after the following mixing is carried out filtering, difference amplification and comparer shaping successively handle.
In addition, said radiofrequency signal transmitting element further comprises: phaselocked loop, prime amplifier, power amplifier, circulator and antenna;
Said radiofrequency signal transmitting element is used for; When sending radiofrequency signal,, pass through the biasing pin of modulation power amplifier again with the local oscillation signal process prime amplifier ingoing power amplifier of phaselocked loop output; Produce the amplitude shift keying signal, through going out by aerial radiation behind the circulator.
The utility model provides cost lower for hand held readers equipment, and size is littler, the reader module of stable performance and receiving demodulation method.Compared with prior art, the utility model has improved electronic tag signal receiving demodulation mode, reduces the blind area; Increased coverage; And compressed the area that device takies, greatly reduce the cost of RFID handhold reading device, and guarantee stable performance under the small size situation.
Description of drawings
Accompanying drawing described herein is used to provide the further understanding to the utility model, constitutes the application's a part, and illustrative examples of the utility model and explanation thereof are used to explain the utility model, do not constitute the improper qualification to the utility model.In the accompanying drawings:
Fig. 1 is the composition schematic block diagram of the reader module of the utility model;
Fig. 2 is the schematic block diagram of the timesharing IQ demodulate reception circuit of the utility model;
Fig. 3 is the schematic block diagram of the radiofrequency signal transmitting element of the utility model.
Embodiment
The fundamental purpose of the utility model is to propose a kind of reader module; Adopt the method for reseptance of ultrahigh frequency RFID timesharing dynamic I Q (being resolution of vectors) quadrature demodulation; Can dead zone-eliminating, improve the performance of hand held readers identification label, and the size of reader remains unchanged.Consider that hand held readers is not high to checking rate request, therefore, under the situation that keeps single channel to receive; Just can realize quadrature IQ demodulation through increasing a phase-shift network; And after demodulation, carry out difference output, like this, under the situation of work; Can carry out timesharing and switch and to check, thereby effectively reduce the blind area of reader module.
For realizing above-mentioned purpose, the utility model specifically adopts following technical scheme:
1) the ultrahigh frequency RFID reader module of the utility model; Mainly by communication control unit, radiofrequency signal receiving element and radiofrequency signal transmitting element; Wherein, described communication control unit, radiofrequency signal transmitting element and radiofrequency signal receiving element preferably adopt discrete component.
2) communication control unit can be made up of ARM single-chip microcomputer (MCU), RS232 interface and 3.3V direct supply interface.
Communication control unit mainly is responsible for the baseband signal of sending is modulated to radio frequency band, and the protocol signal that the processing label returns and the IQ demodulation timesharing of receiving circuit are switched, and the label result who handles is uploaded to host computer.
3) the radiofrequency signal receiving element mainly is made up of timesharing quadrature demodulation receiving circuit and reception baseband processing circuitry.
Timesharing quadrature demodulation receiving circuit mainly adopts the phase shift network of RF switch, two quadratures, two phase shift network electric bridges and two frequency mixer to constitute.
Wherein, the utility model has proposed the way that timesharing dynamic I Q quadrature demodulation receives first, and its core is: receiving at radio frequency increases by two RF switches in the primary link, be used to switch 90 ° of phase shift networks and 0 ° of straight-forward network.Switch said 0 ° of straight-forward network and 90 ° of phase shift networks through timesharing, make two different branches and demodulate next signal in orthogonal constantly, thereby realize timesharing IQ quadrature demodulation.Get into the phase shift network electric bridge then respectively; This phase shift network electric bridge is divided into two-way, and one the tunnel is 90 ° of phase shifts, and one the tunnel is 0 ° of phase shift; Get into down-conversion mixer and local oscillation signal mixing through RF switch respectively; The output of formation differential signal is amplified through differential amplifier and relatively shaping of comparer again, and the digital signal that obtains is directly imported the ARM single-chip microcomputer and carried out software decode.
4) radiofrequency signal transmitting element mainly directly locks onto the frequency that needs by phaselocked loop, through prime amplifier and power amplifier; In order to practice thrift cost; Send the biasing pin that baseband signal directly is loaded into power amplifier, power controlling output, and then reach the purpose that signal is modulated.The rf modulated signal of power amplifier output is directly gone out through antenna transmission through behind the circulator.
For the purpose, technical scheme and the advantage that make the utility model is clearer, hereinafter will combine accompanying drawing that the embodiment of the utility model is elaborated.Need to prove that under the situation of not conflicting, embodiment among the application and the characteristic among the embodiment be combination in any each other.
Fig. 1 shows the reader module of the utility model, and is as shown in Figure 1, mainly is made up of communication control unit, radiofrequency signal transmitting element and radiofrequency signal receiving element.
Communication control unit is made up of ARM single-chip microcomputer, RS232 interface, 3.3V power interface.The ARM single-chip microcomputer is the core of this reader module; Being mainly used in coding output, to the adjustment of carrier wave, to receiving the exchanges data that code check is judged, realized reader module and host computer of separating of electronic tag data signal; Adopt the ARM single-chip microcomputer to make reader module more flexible in practical application; Make things convenient for the optimization of agreement, improve reader module stability.
In the radiofrequency signal receiving element; Timesharing dynamic I Q orthogonal demodulation circuit is the core of this part, all is to adopt single channel demodulation mode (demodulation of I road or the demodulation of Q road) in the existing small size reader module, and this mode blind area in practical application is more; This patent is keeping original size on original circuit base, only to increase by 90 ° of phase shift networks simultaneously; Through the timesharing switching way, realized the IQ quadrature demodulation, reduced the blind area that reader module covers effectively.
In conjunction with shown in Figure 1, the principle of work of the utility model is described below:
Phaselocked loop output 902MHz (megahertz)～928MHz local oscillation signal; Through prime amplifier ingoing power amplifier; The biasing pin of the modulation signal modulation power amplifier through single-chip microcomputer; Produce amplitude modulation(PAM) ASK signal, at last through going out by aerial radiation behind the circulator, and then realize reader module and label alternately.
After label is received the signal that aerial radiation sends; Label can return corresponding signal according to the order that reader module sends, and when receiving the electronic tag return signal, carries out timesharing dynamic I Q quadrature demodulation to receiving primary link; I road differential signal that demodulation is come out or Q road differential signal; Through filter network, handle the back through the differential signal amplifier and give the decoding of ARM single-chip microcomputer by the comparer shaping, accomplish the process of whole reception label signal.
As shown in Figure 2, the radiofrequency signal receiving element of the utility model is to be made up of two RF switches, 90 ° of phase shift networks, 0 ° of straight-forward network, two phase shift network electric bridges and two down-conversion mixers.Between two RF switches, add phase shift network and 0 ° of straight-through network of one 90 °.Wherein, comprise 90 ° of phase shift network passages in 90 ° of phase shift networks, these 90 ° of phase shift network passages can be made up of microstrip line, inductance, electric capacity discrete component, are used for 90 ° of the label signal phase shifts that receives.The phase shift network electric bridge is to adopt 90 ° of special electric bridges, and an end produces 90 ° of phase shifts, and an end is 0 ° of straight-through end.
In conjunction with shown in Figure 2, when control line " control 1 " and " controlling 2 " when being low level, 0 ° of straight forward netwrok of RF switch gating, the signal of exporting after label signal that receives and the local local oscillation signal mixing is the I road of orthogonal signal, wherein I
+And I
-Be difference help anti-interferencely, the specific algorithm formula is following:
I
+The road signal
I
-The road signal
When being high level, 90 ° of phase shift networkings of switching gate receive 90 ° of label signal phase shifts, carry out mixing with local local oscillation signal then with " controlling 2 " when control line " control 1 ", and the signal of exporting after the mixing is the Q road of orthogonal signal, wherein Q
+And Q
-Also be difference, the specific algorithm formula is following:
Q
+The road signal
Q
-The road signal
In the above-mentioned formula, ω
RFBe the label signal frequency return signal, ω
LOBe the frequency of local oscillation signal, and equal ω
RF, θ is the phase differential of local oscillation signal and label return signal, A
RFAnd A
LOIt is respectively the amplitude of label return signal and local oscillation signal.If just adopt a kind of receive mode (the I road receives or the Q road receives) wherein, will there be the blind area in label in individual other place, when θ just equals 0 °; The demodulation label signal amplitude of coming out in I road just in time is 0; This moment, reader module thought do not have label in coverage, and promptly (this label skip) appearred in the blind area, came demodulation if switch to the Q road this moment; In the time of can finding θ=0 ° is to detect label signal, and the amplitude of demodulating is A
RF* A
LO/ 2, label is on a same position, and it is different using the different received circuit to obtain the result, and having only combines these two kinds of receive modes just can avoid the problem of label skip, i.e. blind zone problem effectively.Can obtain by above-mentioned analysis, under the situation that keeps single channel to receive, only increase a phase-shift network and just can realize quadrature IQ demodulation; And after the demodulation difference output; Under the situation of work, carry out the timesharing switching and check, effectively reduced the blind area of reader module.
As shown in Figure 3, the radiofrequency signal transmitting element of the utility model is made up of phaselocked loop, prime amplifier and power amplifier, and phaselocked loop is by the control of ARM single-chip microcomputer; Frequency between locking output 902MHZ～928MHz, the signal of output is through prime amplifier ingoing power amplifier, ARM single-chip microcomputer DAC (Digital to Analog Converter; Digital to analog converter) baseband signal of output is through the processing of base band, and directly the biasing pin of control power amplifiers forms amplitude shift keying (Amplitude Shift Keyed; Abbreviate ASK as) signal; Send through circulator, this circuit all is that the independent component that adopts is built, under the prerequisite of guaranteed performance; Greatly simplify circuit, reduced cost.
In addition, each unit of the ultrahigh frequency reader module of the utility model adopts discrete component, is arranged on the circuit board; Each unit has been optimized circuit greatly; Significantly dwindled the area of plank, only kept RS232 interface, power supply power supply interface and antenna opening, connect antenna and power supply during use after; Just can accomplish having read of label data, institute's read data passes to host computer through RS232.
More than be merely the preferred case study on implementation of the utility model; Be not limited to the utility model; The utility model also can have other various embodiments; Under the situation that does not deviate from the utility model spirit and essence thereof, those of ordinary skill in the art can make various corresponding changes and distortion according to the utility model, but these corresponding changes and distortion all should belong to the protection domain of the appended claim of the utility model.
Claims (7)
1. a radio-frequency identification reader module is characterized in that, comprises communication control unit, radiofrequency signal receiving element and radiofrequency signal transmitting element, wherein,
Said radiofrequency signal receiving element further comprises timesharing quadrature demodulation receiving circuit; Said timesharing quadrature demodulation receiving circuit is used for; Carry out timesharing IQ quadrature demodulation to receiving the electronic tag signal that receives on the primary link, and the differential baseband signal after the output demodulation.
2. radio-frequency identification reader module as claimed in claim 1 is characterized in that,
Said timesharing quadrature demodulation receiving circuit comprises on the reception primary link: 0 ° of straight-forward network and 90 ° of phase shift networks,
Said communication control unit switches said 0 ° of straight-forward network and 90 ° of phase shift networks through timesharing, makes two different branches and demodulates next signal in orthogonal constantly, thereby realize timesharing IQ quadrature demodulation.
3. radio-frequency identification reader module as claimed in claim 2 is characterized in that,
Said 90 ° of phase shift networks comprise: RF switch and 90 ° of phase shift network passages;
Said 0 ° of straight-forward network comprises: RF switch and 0 ° of passage;
Said communication control unit is through control said RF switch, the said 90 ° of phase shift networks of gating or the said 0 ° of straight-forward network of gating.
4. radio-frequency identification reader module as claimed in claim 3 is characterized in that,
Said 90 ° of phase shift network passages are made up of microstrip line, inductance and electric capacity.
5. radio-frequency identification reader module as claimed in claim 3 is characterized in that, said timesharing quadrature demodulation receiving circuit also comprises two phase shift network electric bridges and two down-conversion mixers;
Said 90 ° of phase shift networks link to each other with said two phase shift network electric bridges and down-conversion mixer through RF switch respectively with 0 ° of straight-forward network;
One end of said phase shift network electric bridge produces 90 ° of phase shifts, and the other end is 0 ° of straight-through end; Said down-conversion mixer is used for radio frequency receiving signal and local local oscillation signal mixing, and the baseband signal of output difference.
6. like claim 1,2,3, each described radio-frequency identification reader module of 4 or 5, it is characterized in that,
Said radiofrequency signal receiving element also comprises the reception baseband processing unit, and said reception baseband processing unit further comprises: filter network, differential amplifier and comparer;
Said filter network, differential amplifier and comparer are respectively applied for, and the differential baseband signal after the following mixing is carried out filtering, difference amplification and comparer shaping successively handle.
7. radio-frequency identification reader module as claimed in claim 6 is characterized in that,
Said radiofrequency signal transmitting element further comprises: phaselocked loop, prime amplifier, power amplifier, circulator and antenna;
Said radiofrequency signal transmitting element is used for; When sending radiofrequency signal,, pass through the biasing pin of modulation power amplifier again with the local oscillation signal process prime amplifier ingoing power amplifier of phaselocked loop output; Produce the amplitude shift keying signal, through going out by aerial radiation behind the circulator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201677798U CN202196417U (en) | 2011-05-24 | 2011-05-24 | Radio frequency identification reader module |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201677798U CN202196417U (en) | 2011-05-24 | 2011-05-24 | Radio frequency identification reader module |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105572413A (en) * | 2015-12-31 | 2016-05-11 | 智坤（江苏）半导体有限公司 | System of measuring passive UHF RFID tag movement speed and direction, and measuring method and application thereof |
| CN106254297A (en) * | 2016-08-31 | 2016-12-21 | 浙江嘉科电子有限公司 | A kind of vector modulator |
| CN109670353A (en) * | 2017-10-13 | 2019-04-23 | 重庆微标科技股份有限公司 | The decoding and error method of a kind of electronic equipment and RF tag |
| CN111401087A (en) * | 2019-01-03 | 2020-07-10 | 华大半导体有限公司 | Radio frequency identification reader and method thereof |
-
2011
- 2011-05-24 CN CN2011201677798U patent/CN202196417U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105572413A (en) * | 2015-12-31 | 2016-05-11 | 智坤（江苏）半导体有限公司 | System of measuring passive UHF RFID tag movement speed and direction, and measuring method and application thereof |
| CN106254297A (en) * | 2016-08-31 | 2016-12-21 | 浙江嘉科电子有限公司 | A kind of vector modulator |
| CN106254297B (en) * | 2016-08-31 | 2023-11-28 | 浙江嘉科电子有限公司 | Vector modulator |
| CN109670353A (en) * | 2017-10-13 | 2019-04-23 | 重庆微标科技股份有限公司 | The decoding and error method of a kind of electronic equipment and RF tag |
| CN109670353B (en) * | 2017-10-13 | 2021-10-22 | 重庆微标科技股份有限公司 | Electronic equipment and decoding error correction method of radio frequency tag |
| CN111401087A (en) * | 2019-01-03 | 2020-07-10 | 华大半导体有限公司 | Radio frequency identification reader and method thereof |
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| GR01 | Patent grant | ||
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| TR01 | Transfer of patent right |
Effective date of registration: 20160905 Address after: 300308 Tianjin Airport Economic Zone, Binhai New Area seven East Road No. 2 Zhongxing Industrial Base Patentee after: ZTE INTELLIGENT IOT TECHNOLOGY CO., LTD. Address before: 518057 Nanshan District Guangdong high tech Industrial Park, South Road, science and technology, ZTE building, Ministry of Justice Patentee before: ZTE Corporation |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120418 Termination date: 20190524 |