CN101964074B - Radio-frequency electronic identifier and radio-frequency identification system and realization method thereof - Google Patents

Abstract

The invention discloses a radio-frequency electronic identifier and a radio-frequency identification system and a realization method thereof. The radio-frequency electronic identifier comprises antennas, an analog circuit, a logic control circuit and a memory, wherein, the analog circuit comprises a frequency band selection circuit. In the invention, a wider working frequency band is divided into a plurality of working sub-frequency bands by the band selection circuit, so as to lead the radio-frequency electronic identifier of the invention to operate in a narrower working sub-frequency band, thus improving the radio-frequency input quality factor and the read-write sensitivity of the radio-frequency electronic identifier; the temporary frequency hopping or the fixed frequency hopping are performed through a read-write control electronic identifier, so as to improve the information safety of the electronic identifier, or satisfy the regional wireless spectrum legal provisions.

Description

Less radio-frequency electronic mark, radio frequency identification system and its implementation

Technical field

The invention belongs to field of radio frequency integrated circuits, relate to a kind of less radio-frequency electronic mark, radio frequency identification system and its implementation, be specially less radio-frequency electronic mark, radio frequency identification system and its implementation of a kind of ultrahigh frequency or 2.4G frequency range.

Background technology

RFID is a REID, and it is a kind of contactless automatic identification technology, and its ultimate principle is to utilize radiofrequency signal and space coupling and transport property, realizes the automatic identification to static or mobile object.Radio-frequency recognition system generally partly is made up of electronic mark, read write line, antenna and main frame etc., the data message of storage destination object in the electronic mark.During system works, read write line is through the radio frequency interface radiated electromagnetic wave, after the read-write scope of electronic mark entering read write line; Receive the radiofrequency signal of read write line, the energy that relies on induction to be obtained sends out the product information (being Passive Tag, passive marker or passive sign) that is stored in the chip; The signal that perhaps initiatively sends a certain frequency (is Active Tag; Active sign or active sign), after read write line receives, reads information and decoding, deliver to CIS and carry out the related data processing; Realization is read the noncontact to electronic mark; Reach automatic recognition objective object and obtain the purpose of related data, reading while write device can also carry out write operation to electronic mark under the control of main frame, rewrites the information in the sign that is stored in.In general, according to employed electromagnetic wave frequency range, the RFID technology is divided into three types of low frequencies (LF), high frequency (HF), ultrahigh frequency (UHF).Wherein super high frequency technique has advantages such as decipherment distance is far away, recognition speed fast, can discern high-speed moving target, data capacity is big, is more suitable for the application in following logistics and supply chain field.

For super high frequency technique; Present international standard ISO18000-6C has stipulated the working frequency range of 860-960MHz; ISO18000-4 has stipulated the working frequency range of 2.45GHz; And countries in the world have been formulated the permission working frequency range of country separately respectively, and probably each frequency range 4～20MHz width does not wait, and are used as UHF RFID like China regulation 840-845MHz and 920-925MHz frequency range.Because electronic mark will adapt to the working frequency range in the whole world; Therefore the realization of all electronic mark chips at present all is that the wideband section covers, and like ultrahigh frequency frequency range 860-960MHz, covering reaches nearly 100 megahertzes; The quality factor that this means electronic mark chip radio frequency input circuit are low to moderate about 10; Selectivity ratios is relatively poor, and such situation will cause read-write sensitivity and the reading/writing distance of electronic mark chip to receive certain restriction not reaching optimal situation, in addition; Because the frequency of operation of read write line and electronic mark is in same frequency range all the time, there is certain hidden danger in information security.

In sum; The UHF electronic sign that can know prior art exists quality factor low and read-write sensitivity that causes thus and the problem that reading/writing distance is relatively poor, there is hidden danger in information security; Therefore, be necessary to propose improved technological means in fact, solve this problem.

Summary of the invention

For overcoming signal-selectivity and the Information Security problem that above-mentioned prior art exists; One object of the present invention is to provide a kind of less radio-frequency electronic mark, radio frequency identification system and its implementation; It is through definition work frequency sub-band; Make the less radio-frequency electronic mark work in narrower work frequency sub-band; Improve the radio frequency import prime factor and the read-write sensitivity of less radio-frequency electronic mark, made the less radio-frequency electronic mark that the read write line response that is operated in another work frequency sub-band is weakened simultaneously, improved reading/writing distance.

Another object of the present invention is to provide a kind of less radio-frequency electronic mark, radio frequency identification system and its implementation; It carries out interim redirect or fixedly redirect through read write line control less radio-frequency electronic mark; Make other read write lines can not grasp the information and the state of less radio-frequency electronic mark comprehensively, improve the Information Security of less radio-frequency electronic mark.

For reaching above-mentioned and other purpose, the present invention has realized a kind of less radio-frequency electronic mark, comprises antenna, mimic channel, logic control circuit and storer, and wherein, this mimic channel further comprises:

Matching network; Be connected in this antenna; Be used for the impedance of this antenna and the input impedance of this less radio-frequency electronic mark chip are mated; So that follow-up rectification circuit can be effectively convert the part RF energy of this antenna induction into supply other part to use DC voltage, make signal that demodulator circuit obtains enough energy simultaneously so that right demodulation;

The Frequency Band Selection circuit; Be connected between this matching network and rectification circuit, modulation circuit and the demodulator circuit; Be used for a working frequency range is divided into a plurality of work frequency sub-band; The work at present frequency sub-band of this less radio-frequency electronic mark is selected to set according to the read write line signal that this less radio-frequency electronic mark receives through this logic control circuit, when this less radio-frequency electronic mark initially powers on, can call the default work frequency sub-band of this less radio-frequency electronic mark that is stored in the storer automatically;

Rectification circuit is used for the RF energy of this antenna induction is converted into other parts uses that DC voltage offers this less radio-frequency electronic mark;

Demodulator circuit, input end are connected in this matching network, with the radio-frequency pulse that receives through this this antenna of matching network reception, and therefrom demodulate instruction and data, deliver to this logic control circuit and carry out subsequent treatment;

Modulation circuit, input end are connected to this logic control circuit, the instruction and data of this logic control circuit generation is modulated the back go out through this antenna transmission;

Electrify restoration circuit is connected in this logic control circuit, is used to produce reset signal; And

Clock generation circuit is connected in this electrify restoration circuit and this logic control circuit, for this electrify restoration circuit and this logic control circuit provide clock signal.

Further; Mimic channel of the present invention also comprises a mu balanced circuit; Its input end is connected in the output terminal of this rectification circuit, and output terminal is connected with this modulation circuit, this demodulator circuit and this logic control circuit, thinks that this less radio-frequency electronic mark provides stable WV.

Wherein, this working frequency range is 840MHz-960MHz.

Wherein, this working frequency range is 2.45GHz-2.485GHz.

Wherein, this Frequency Band Selection circuit is divided into 4 work frequency sub-band with this working frequency range.

Wherein, the bandwidth of each work frequency sub-band is 20MHz-30MHz.

For reaching above-mentioned and other purpose; The present invention has also realized a kind of radio frequency identification system; It comprises an above-mentioned less radio-frequency electronic mark and a read write line; It is characterized in that this less radio-frequency electronic mark is divided into a plurality of work frequency sub-band through a Frequency Band Selection circuit with a working frequency range, and the default work frequency sub-band of this less radio-frequency electronic mark is arranged in the storer of this less radio-frequency electronic mark; When this read write line reads this less radio-frequency electronic mark; Send continuous carrier to this less radio-frequency electronic mark so that electric flux on it to be provided on the frequency near the centre of the first work of each in the wireless frequency spectrum specialized range successively frequency sub-band, if having only one section effective wireless frequency, the two ends that the read write line working frequency range can be set are respectively as two work frequency sub-band.Automatically from storer, transfer default work frequency sub-band after this less radio-frequency electronic mark powers on then parameter is set, and the work frequency sub-band of this sign is set.

For reaching above-mentioned and other purpose, the present invention also provides the implementation method of a kind of radio frequency identification system, and it comprises the steps:

Define the work frequency sub-band of this less radio-frequency electronic mark, a working frequency range is divided into a plurality of these work frequency sub-band, and the setting of the default work frequency sub-band of this less radio-frequency electronic mark is stored in the storer of this less radio-frequency electronic mark;

When this read write line will read this less radio-frequency electronic mark, near each work frequency sub-band is middle, send continuous carrier to this less radio-frequency electronic mark, so that this less radio-frequency electronic mark is charged on the frequency at first successively;

After this less radio-frequency electronic mark powers on, read this default work frequency sub-band of setting in this storer, and the work at present frequency sub-band is set to this default work frequency sub-band; Read while write the device frequency sub-band of will working and be set at corresponding work frequency sub-band.

Further; When this read write line is not known the default work frequency sub-band of this less radio-frequency electronic mark or need to be forced the less radio-frequency electronic mark to be operated in other work frequency sub-band, can after a plurality of different frequency continuous carriers of emission, closely follow one comprise interim frequency sub-band parameter interim frequency sub-band select command; This less radio-frequency electronic mark is set to the odd-job frequency sub-band that this interim frequency sub-band parameter is confirmed according to this interim frequency sub-band select command work at present frequency sub-band; And returning an interim setting check signal, this interim setting check signal can not return under many tag environment.

Further, this method also comprises the steps:

This read write line can send to this less radio-frequency electronic mark and comprise the fixedly stator Frequency Band Selection order of setup parameter;

This less radio-frequency electronic mark is after receiving this stator Frequency Band Selection order; According to this fixedly setup parameter revise the default work frequency sub-band in this storer; And return fixedly setting check signal to this read write line, this fixedly the setting check signal under many tag environment, can not return.

Further, this method comprises the steps: that also this read write line sends this interim frequency sub-band select command to this less radio-frequency electronic mark continuously, to realize the continuous redirect of work frequency sub-band.

Wherein, frequency is near the frequency center of each work frequency sub-band near this centre, if having only one section effective wireless frequency, the two ends that the read write line working frequency range can be set power on for this less radio-frequency electronic mark as the frequency of emission continuous carrier respectively.

Wherein, each work frequency sub-band centre frequency carrier wave sends and is not less than 200us.

Compared with prior art; A kind of electronic mark of the present invention, radio frequency identification system and implementation method, its radio circuit in electronic mark partly is provided with the Frequency Band Selection circuit, through the Frequency Band Selection circuit work frequency sub-band is defined and selects; Make that electronic mark of the present invention can be a narrower work frequency sub-band job; Solved prior art because electronic mark wideband end covers the low problem of quality factor that produces, through experiment, the radio frequency import prime factor of electronic mark of the present invention can be brought up to 25-40 by original about 10; Improved selectivity greatly; And the electronic mark that makes improves in the sensitivity meeting of a certain work frequency sub-band to a certain extent, and weakens greatly for the response of the read write line that is operated in another work frequency sub-band simultaneously, improved security; In addition, implementation method of the present invention also through interim frequency hopping and fixing frequency hopping, makes other read write lines can not comprehensively grasp the information and the state of sign, has improved the Information Security of electronic mark, has reached the purpose of information security.

Description of drawings

Fig. 1 is the circuit structure diagram of a kind of preferred embodiment of less radio-frequency electronic mark of the present invention;

Fig. 2 comprises the system architecture diagram of the radio frequency identification system of less radio-frequency electronic mark among Fig. 1 for the present invention;

Fig. 3 is the implementation method process flow diagram of a kind of radio frequency identification of the present invention system.

Embodiment

Below through specific instantiation and accompanying drawings embodiment of the present invention, those skilled in the art can understand other advantage of the present invention and effect easily by the content that this instructions disclosed.The present invention also can implement or use through other different instantiation, and each item details in this instructions also can be based on different viewpoints and application, carries out various modifications and change under the spirit of the present invention not deviating from.

Fig. 1 is the schematic diagram of a kind of preferred embodiment of less radio-frequency electronic mark of the present invention.As shown in Figure 1, a kind of less radio-frequency electronic mark 100 of the present invention comprisesmimic channel 101,antenna 102,logic control circuit 103 andstorer 104.

Mimic channel 101 is responsible for sending command signal and the reflection answer signal between modulation, receiving demodulation less radio-frequency electronic mark 100 and the read write line (not shown), and it further comprises: matchingnetwork 1011, FrequencyBand Selection circuit 1012,rectification circuit 1013, mu balancedcircuit 1014,demodulator circuit 1015,modulation circuit 1016,electrify restoration circuit 1017 and clock generation circuit 1018.Matching network 1011 is used for the input impedance of the impedance ofantenna 102 andrectification circuit 1013 is mated; So thatrectification circuit 1013 can effectively transform the part RF energy ofantenna 102 inductions and supply the dc energy (DC voltage) of back level module use, guarantee that simultaneously demodulator circuit can obtain the energy of enough right demodulation signals; FrequencyBand Selection circuit 1012 is connected betweenmatching network 1011 and therectification circuit 1013, and is connected inlogic control circuit 103 andstorer 104; Be used for a broad working frequency range is divided into a plurality of work frequency sub-band, the bandwidth of each work frequency sub-band is advisable with 20MHz-30MHz, and will the work set information of frequency sub-band of FrequencyBand Selection circuit 1012 is stored in thestorer 104; Selecting to set through 103 pairs of work of logic control circuit frequency sub-band, in preferred embodiment of the present invention, is a sub-band width with 30MHz; Ultrahigh frequency frequency range (840-960MHz) is divided into 4 work frequency sub-band; Promptly 840～870MHz is the first work frequency sub-band, and 870～900MHz is the second work frequency sub-band, and 900～930MHz is the 3rd work frequency sub-band; 930～960MHz is the 4th work frequency sub-band; And the setting of the frequency sub-band of will working is stored in thestorer 104 of less radio-frequency electronic mark 100, so that less radio-frequency electronic mark 100 reads and set on request the work frequency sub-band when powering on, with the resonance band ofcontrol antenna 102; Can look design requirement and decide as for the quantity of cutting apart the work frequency sub-band, the present invention is not as limit;Rectification circuit 1013 is used for the part RF energy ofantenna 102 inductions is converted into the dc energy (DC voltage) that back each module of level is used; Mubalanced circuit 1014 is optional circuit; Its input end is connected in the output terminal ofrectification circuit 1013, and output terminal links to each other withdemodulator circuit 1015,modulation circuit 1016 andlogic control circuit 103 respectively, and the dc voltage stability that is used forrectification circuit 1013 is exported is in the particular level scope; For less radio-frequency electronic mark 100 provides stable WV; Preferable, in the preferred embodiment of the present invention, this mu balanced circuit also can be different from traditional mu balanced circuit; Here mu balancedcircuit 1014 also can only limit high pressure and do not have voltage drop to be beneficial to the less radio-frequency electronic mark to low pressure can be in extremely low-yield down work, the present invention is not as limit; Itsdemodulator circuit 1015; Its input end is connected inmatching network 1011; Be used for demodulating instruction and data from the radio-frequency pulse thatantenna 102 receives, and deliver tologic control circuit 103 and handle,demodulator circuit 1015 adopts simple demodulation method such as envelope detection mode or FSK usually;Modulation circuit 1016 input ends are connected tologic control circuit 103; Impedance through control less radio-frequency electronic mark 100 radio frequency interfaces; Thereby the reflection coefficient that changes atantenna 102 interfaces comes the data-signal thatlogic control circuit 103 produces is modulated, and feeds back to read write line throughantenna 102;Electrify restoration circuit 1017; Be connected inlogic control circuit 103, here, electrify restoration circuit has two main effects: the one, when the effective coverage of less radio-frequency electronic mark 100 entering read write lines; When supply voltage has reached the operate as normal current potential; Producing the reset signal of entire chip, secondly is when supply voltage reduces suddenly, and this circuit can prevent that through resetting capability error from appearring in logical circuit; Andclock generation circuit 1018, for example adopt ring oscillator circuit, forelectrify restoration circuit 1017 andlogic control circuit 103 provide clock signal.

Antenna 102, be used for and reading and writing device antenna between obtain RF energy through electromagnetic field couples;Logic control circuit 103 is used to control the flow direction of less radio-frequency electronic mark 100 internal datas; Instruction control less radio-frequency electronic mark 100 according to receiving carries out state exchange, stores and returns needed content, comprises functions such as command analysis, digital coding, data storage, read/write;Storer 104 is used for data storage, and preferred,storer 104 is generally scratch pad memory (EEPROM) or single writable memory (OTP), and the default work frequency sub-band of less radio-frequency electronic mark 100 then is arranged in thestorer 104.

Fig. 2 is the structural drawing of a kind of preferred embodiment of a kind of radio frequency identification of the present invention system.As shown in Figure 2; A kind of radio frequency identification of the present invention system; Comprise read write line 200 and less radio-frequency electronic mark 100 shown in Figure 1, wherein, less radio-frequency electronic mark 100 is divided into a plurality of work frequency sub-band through the Frequency Band Selection circuit with a broad working frequency range; This broad working frequency range can be the ultrahigh frequency frequency range; Like 840MHz-960MHz, the present invention is as limit, and the default work frequency sub-band of this less radio-frequency electronic mark 100 is arranged in the storer of less radio-frequency electronic mark 100; When read write line 200 need read the less radio-frequency electronic mark; Read write line 200 sends continuous carrier to less radio-frequency electronic mark 100 so that less radio-frequency electronic mark 100 powers at first successively on the intermediate frequency of each work frequency sub-band, then from storer, read the information of default work frequency sub-band and it is provided with the work at present frequency sub-band of this less radio-frequency electronic mark 100 by less radio-frequency electronic mark 100, simultaneously; Read write line 200 self also is provided with its corresponding work frequency sub-band, and promptly the work at present frequency range of read write line 200 also is set to the default work frequency sub-band of less radio-frequency electronic mark 100.In addition, read write line 200 is Iterim Change or the fixing default work frequency sub-band that changes less radio-frequency electronic mark 100 according to circumstances, and less radio-frequency electronic mark 100 will give feedback acknowledgment.

Fig. 3 is the process flow diagram of first preferred embodiment of radio frequency identification of the present invention system implementation method; Please be simultaneously with reference to figure 3 and Fig. 2; The implementation method of a kind of radio frequency identification of the present invention system is applied in the radio frequency identification system of Fig. 2, and concrete steps are following:

Step 201, the work frequency sub-band of definition less radio-frequency electronic mark 100 is divided into a plurality of work frequency sub-band with a broad working frequency range; And the setting of frequency sub-band is stored in the storer of less radio-frequency electronic mark 100, so that the less radio-frequency electronic mark reads and set the work at present frequency sub-band when powering on, with the resonance band of control antenna; Step 201 can realize through FrequencyBand Selection circuit 1012 among the present invention, and the width of each work frequency sub-band is advisable with 20～30MHz in this step, with the ultrahigh frequency frequency range for example; Suppose that with 30MHz be a work frequency sub-band width, 840～870MHz is the first work frequency sub-band, and 870～900MHz is the second work frequency sub-band; 900～930MHz is the 3rd work frequency sub-band; 930～960MHz is the 4th work frequency sub-band, and only to illustrate, the present invention is not as limit here;

Step 202; When less radio-frequency electronic mark 100 gets into the default work frequency sub-band of read-write scope and read write line 200 known less radio-frequency electronic marks 100 of read write lines 200; The read write line 200 at first transmission continuous carrier on arbitrary frequency in the middle of each work frequency sub-band charges to sign; Each frequency sub-band time preferably is not less than 200us; Less radio-frequency electronic mark 100 can obtain enough energy under the situation of the frequency sub-band of how working and power on not knowing that read write line 200 will be provided with like this, and is preferable, and middle arbitrary frequency is preferably near the frequency center of each work frequency sub-band; Certainly, if having only one section effective wireless frequency, the two ends that this read write line working frequency range then can be set power on for this less radio-frequency electronic mark as the frequency of two emission continuous carriers respectively.

Step 203 after less radio-frequency electronic mark 100 powers on, reads the default work frequency sub-band of setting in the storer, and sets the work at present frequency sub-band of this default work frequency sub-band for this less radio-frequency electronic mark 100.Reading while write that device 200 also is provided with default for this reason work frequency sub-band with its work at present frequency range and determines whether to allow this less radio-frequency electronic mark 100 is that the work at present frequency sub-band carries out work with default work frequency sub-band;

Step 204 is that the work at present frequency sub-band carries out work if read write line 200 allows less radio-frequency electronic mark 100 with default work frequency sub-band, then directly gets into step 205; If read write line 200 does not allow less radio-frequency electronic mark 100 with the work of default work frequency sub-band; Do not know that such as read write line 200 the default work frequency sub-band of less radio-frequency electronic mark 100 perhaps need change the work frequency sub-band of electronic mark owing to the reason of information security or across country variant; Then read write line 200 sends an interim frequency sub-band select command Sel SubBand and gives interim setting or the interim redirect of less radio-frequency electronic mark 100 less radio-frequency electronic mark 100 is carried out the work at present frequency sub-band; This interim frequency sub-band select command Sel SubBand heel frequency sub-band parameter gets into step 206;

Step 205, less radio-frequency electronic mark 100 carries out subsequent communications with this default work frequency sub-band and read write line 200;

Step 206; When interim frequency sub-band select command Sel SubBand that less radio-frequency electronic mark 100 receives that read write line 200 sends; Then be set to the frequency sub-band (i.e. the definite frequency sub-band of this frequency sub-band parameter) that interim frequency sub-band select command is confirmed according to interim frequency sub-band select command work at present frequency range; And return one to read write line and confirm the interim feedback signal of setting; Then less radio-frequency electronic mark 100 will carry out subsequent communications with frequency sub-band and the read write line that interim frequency sub-band select command is confirmed, need to prove, confirm that the feedback signal of interim setting can not returned under many tag environment.

Certainly; Because some specific needs; Will be for a long time, uses the permission working frequency range in being another range of countries of non-default work frequency sub-band like less radio-frequency electronic mark 100; The default work frequency sub-band that this just needs to change less radio-frequency electronic mark 100 carries out the fixedly setting or the fixedly redirect of work frequency sub-band, and second preferred embodiment of following radio frequency identification of the present invention system implementation method has then been realized this purpose.Be that with the first preferred embodiment of the invention difference second preferred embodiment of the invention also has subsequent step after step 206:

Step 207, read write line 200 continue to send stator Frequency Band Selection order Sel SubBand and give less radio-frequency electronic mark 100, and this stator Frequency Band Selection order Sel SubBand heel is setup parameter fixedly;

Step 208; Less radio-frequency electronic mark 100 then will be revised the frequency sub-band settings in the scratch pad memory after receiving the order of stator Frequency Band Selection, be about to the definite work frequency sub-band of current fixedly setup parameter and be revised as default work frequency sub-band; And return one to read write line and confirm the fixing feedback signal of setting; Equally, need to prove, confirm that the feedback signal of fixing setting can not returned yet under many tag environment.。

Certainly; For security needs, the present invention can also carry out the security that continuous redirect can strengthen electronic mark at the different operating frequency sub-band through making less radio-frequency electronic mark 100, specifically; Can realize continuous redirect work frequency sub-band through the control of 200 pairs of electronic marks of read write line; Promptly in certain time interval, repeat to send interim frequency sub-band select command,, be the frequency hopping mode of operation to realize the continuous redirect of work frequency sub-band to less radio-frequency electronic mark 100 through read write line.Wherein, the frequency of redirect can be adjusted as required, as in China; The frequency range of permission work has two, and one is 840-845MHz, and another is 920-925MHz; In order to increase the security of less radio-frequency electronic mark; Can make the continuously redirect between these two frequency ranges of less radio-frequency electronic mark, because these two frequency ranges differ 80MHz, the redirect between the frequency range can be played the information safety protection effect.

Empirical tests; The present invention carries out definition of work frequency sub-band and frequency hopping agreement through above-mentioned Frequency Band Selection circuit; Make the radio frequency import prime factor of less radio-frequency electronic mark chip of the present invention to bring up to 25-40 by original about 10; Improved selectivity greatly; And because this sensitivity meeting in a certain work frequency sub-band of less radio-frequency electronic mark of the present invention improves to a certain extent, then can weaken greatly, improve the security of less radio-frequency electronic mark for the response of the read write line that is operated in another work frequency sub-band simultaneously.In addition, the present invention makes other read write line can not comprehensively grasp the information and the state of electronic mark through the less radio-frequency electronic mark being carried out interim frequency hopping and the fixedly setting of frequency hopping, and the security that has improved electronic mark has reached the purpose of information security.

The foregoing description is illustrative principle of the present invention and effect thereof only, but not is used to limit the present invention.Any those skilled in the art all can be under spirit of the present invention and category, and the foregoing description is modified and changed.Therefore, rights protection scope of the present invention should be listed like claims.

Claims (10)

1. a less radio-frequency electronic mark comprises antenna, mimic channel, logic control circuit and storer, it is characterized in that, this mimic channel further comprises:

Matching network; Be connected in this antenna; Be used for the impedance of this antenna and the input impedance of this less radio-frequency electronic mark chip are mated; So that follow-up rectification circuit can be effectively convert the part RF energy of this antenna induction into supply other part to use DC voltage, make signal that demodulator circuit obtains enough energy simultaneously so that right demodulation;

The Frequency Band Selection circuit; Be connected between this matching network and a rectification circuit, a modulation circuit and the demodulator circuit; Be used for a working frequency range is divided into a plurality of work frequency sub-band; The work at present frequency sub-band of this less radio-frequency electronic mark is selected to set according to the read write line signal that this less radio-frequency electronic mark receives through this logic control circuit, when this less radio-frequency electronic mark initially powers on, can call the default work frequency sub-band of this less radio-frequency electronic mark that is stored in this storer automatically;

Rectification circuit is used for the RF energy of this antenna induction is converted into other parts uses that DC voltage offers this less radio-frequency electronic mark;

Demodulator circuit, input end are connected in this matching network, with the radio-frequency pulse that receives through this this antenna of matching network reception, and therefrom demodulate instruction and data, deliver to this logic control circuit and carry out subsequent treatment;

Modulation circuit, input end are connected to this logic control circuit, the instruction and data of this logic control circuit generation is modulated the back go out through this antenna transmission;

Electrify restoration circuit is connected in this logic control circuit, is used to produce reset signal; And

Clock generation circuit is connected in this electrify restoration circuit and this logic control circuit, for this electrify restoration circuit and this logic control circuit provide clock signal.

2. less radio-frequency electronic mark as claimed in claim 1; It is characterized in that: this mimic channel also comprises a mu balanced circuit; Its input end is connected in the output terminal of this rectification circuit; Output terminal is connected with this modulation circuit, this demodulator circuit and this logic control circuit, for this less radio-frequency electronic mark provides stable WV.

3. less radio-frequency electronic mark as claimed in claim 2 is characterized in that: this working frequency range is 840MHz-960MHz or 2.45GHz-2.485GHz.

4. less radio-frequency electronic mark as claimed in claim 3 is characterized in that: this Frequency Band Selection circuit is divided into 4 work frequency sub-band with this working frequency range, and the bandwidth of each work frequency sub-band is 20MHz-30MHz.

5. one kind comprises the radio frequency identification system of less radio-frequency electronic mark according to claim 1; Comprise this a less radio-frequency electronic mark and a read write line; It is characterized in that; This less radio-frequency electronic mark is divided into a plurality of work frequency sub-band through a Frequency Band Selection circuit with a working frequency range; And the default work frequency sub-band of this less radio-frequency electronic mark is arranged in the storer of this less radio-frequency electronic mark, when this read write line reads this less radio-frequency electronic mark, send continuous carrier to this less radio-frequency electronic mark on the arbitrary frequency in centre of the work of each in wireless frequency spectrum specialized range frequency sub-band successively earlier and power on to guarantee this less radio-frequency electronic mark; This less radio-frequency electronic mark directly reads this default work frequency sub-band from this storer then; The work at present frequency sub-band is set to this default work frequency sub-band, and simultaneously, read write line is set at corresponding work frequency sub-band with its work frequency sub-band.

6. radio frequency identification as claimed in claim 5 system; It is characterized in that: if this working frequency range has only one section effective wireless frequency, the two ends that this read write line working frequency range then can be set power on for this less radio-frequency electronic mark as the frequency of two emission continuous carriers respectively.

7. the implementation method like the said radio frequency identification of claim 5 system comprises the steps:

Define the work frequency sub-band of this less radio-frequency electronic mark, a working frequency range is divided into a plurality of these work frequency sub-band, and the setting of the default work frequency sub-band of this less radio-frequency electronic mark is stored in the storer of this less radio-frequency electronic mark;

When this read write line will read this less radio-frequency electronic mark and known this default work frequency sub-band; Sending continuous carrier to this less radio-frequency electronic mark, so that this less radio-frequency electronic mark is charged on arbitrary frequency in the middle of each work frequency sub-band successively earlier;

After this less radio-frequency electronic mark powers on, read this default work frequency sub-band of setting in this storer, and the work at present frequency sub-band is set at this default work frequency sub-band, read while write device the work at present frequency range also is set at this default work frequency sub-band.

8. the implementation method of radio frequency identification as claimed in claim 7 system; It is characterized in that: when this read write line does not know that this less radio-frequency electronic mark of default work frequency sub-band or needs pressure of this less radio-frequency electronic mark is operated in other work frequency sub-band; Then after a plurality of different frequency continuous carriers of emission, closely follow one comprise interim frequency sub-band parameter interim frequency sub-band select command; This less radio-frequency electronic mark is set to the odd-job frequency sub-band that this interim frequency sub-band parameter is confirmed according to this interim frequency sub-band select command work at present frequency sub-band; And returning an interim setting check signal, this interim setting check signal can not return under many tag environment.

9. the implementation method of radio frequency identification as claimed in claim 8 system is characterized in that this method also comprises the steps:

This read write line sends to this less radio-frequency electronic mark and comprises the fixedly stator Frequency Band Selection order of setup parameter;

This less radio-frequency electronic mark is after receiving this stator Frequency Band Selection order; According to this fixedly setup parameter revise the default work frequency sub-band in this storer; And return fixedly setting check signal to this read write line, this fixedly the setting check signal under many tag environment, can not return.

10. the implementation method of radio frequency identification as claimed in claim 8 system; It is characterized in that; This method comprises the steps: that also this read write line can repeat to send this interim frequency sub-band select command to this less radio-frequency electronic mark in certain time interval; To realize the continuous redirect of work frequency sub-band, be the frequency hopping mode of operation.

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