CN102842017B - A kind of extended method of read head, device and system - Google Patents
A kind of extended method of read head, device and system Download PDFInfo
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- CN102842017B CN102842017B CN201210236690.1A CN201210236690A CN102842017B CN 102842017 B CN102842017 B CN 102842017B CN 201210236690 A CN201210236690 A CN 201210236690A CN 102842017 B CN102842017 B CN 102842017B
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Abstract
The embodiment of the invention discloses a kind of extended method of read head, device and system.Embodiment of the present invention method comprises: receive the downgoing signal that reading head arrangement sends, downgoing signal the first local oscillation signal and the first frequency variation signal is carried out conjunction rood arrive, downgoing signal is reduced, and the downgoing signal of reduction is sent to radio frequency discrimination RFID card, rfid card is made to respond and upward signal is sent to reading head arrangement, the present embodiment can change the channel of downgoing signal, realize uplink and downlink signal and divide transmission, the sensitivity of read head can be improved, while expansion read range, ensure that reading efficiency, reduce the usage quantity of read head.
Description
Technical field
The present invention relates to the communications field, particularly relate to a kind of extended method of read head, device and system.
Background technology
Radio-frequency (RF) identification (RFID, Radio Frequency IDentification) technology, reads and writes related data by radio signals identification specific objective, and without the need to setting up machinery or optical contact between recognition system and specific objective.Concrete, RFID technique comprises interrogator and transponder, after transponder enters magnetic field, receive the radiofrequency signal that interrogator sends, the energy obtained by means of induction current sends out storage product information in the chips, or initiatively send the signal of a certain frequency, interrogator reads information and after decoding, delivers to CIS and carry out relevant data process.
RFID technique is made an inventory and is produced many industries such as wire management be widely used at logistics, transport, parking lot, article at present.But the receiving sensitivity of RFID technique self is poor, its scope covered is very limited, inside a lot of industry, in order to the scope that extended RFID reads, needs to adopt some expansion techniques to realize the covering of RFID technique.
At present, prior art mainly divides the method for multichannel by controlling radio-frequency (RF) switch, is then realized the large area covering of RFID technique by the mode of antenna pulling away.
The present inventor finds in the research and practice process of prior art, and prior art has three shortcomings:
The first, because the loss that radio-frequency (RF) switch is intrinsic cannot be avoided, too many road can not be divided, radio-frequency (RF) switch point multichannel can cause signal to carry out echo attenuation excessive, reading efficiency declines;
The second, antenna pulling away adds difficulty of construction, makes the signal attenuation of antenna itself simultaneously, and the oversize reading efficiency that also can cause of antenna declines;
Three, when to open multiplex operation simultaneously, the distribution of signal also can cause signal attenuation to strengthen, and causes degradation problem under reading efficiency.
Summary of the invention
Embodiments provide a kind of extended method of read head, device and system, for improving the sensitivity of read head, ensureing reading efficiency, reducing the usage quantity of read head.
An extended method for read head, comprising: receive the downgoing signal that described reading head arrangement sends, described downgoing signal the first local oscillation signal and the first frequency variation signal is carried out conjunction rood arrive; Described downgoing signal is reduced, and the downgoing signal of described reduction is sent to radio frequency discrimination RFID card, make described rfid card respond and upward signal is sent to described reading head arrangement.
An extended method for read head, comprising: obtain the first local oscillation signal and the first frequency variation signal, and described first local oscillation signal and the first frequency variation signal are carried out conjunction road, obtains the downgoing signal after closing road; Downgoing signal behind described conjunction road is sent to expanding unit, described downgoing signal is reduced by expanding unit, and the downgoing signal of reduction is sent to radio frequency discrimination RFID card, make described rfid card response concurrent send upward signal; Receive the upward signal that described rfid card sends.
A kind of expanding unit, comprising: antenna 20, processor 40 and antenna 24; Described antenna 20, for receiving the downgoing signal that described reading head arrangement sends, described downgoing signal the first local oscillation signal and the first frequency variation signal is carried out conjunction rood arrive; Described processor 40, for the downgoing signal reduction received by antenna 20; Described antenna 24, the downgoing signal for being reduced by processor 40 sends to radio frequency discrimination RFID card, makes described rfid card respond and upward signal is sent to described reading head arrangement.
A kind of reading head arrangement, comprising: combiner 4, antenna 9 and RFID read head 1; Described combiner 4, for obtaining the first local oscillation signal and the first frequency variation signal, and carries out conjunction road by described first local oscillation signal and the first frequency variation signal, obtains the downgoing signal after closing road; Described antenna 9, expanding unit is sent to for described combiner 4 is closed the downgoing signal behind road, described downgoing signal is reduced by expanding unit, and the downgoing signal of reduction is sent to radio frequency discrimination RFID card, make described rfid card response concurrent send upward signal; Described RFID read head 1, for receiving the upward signal that rfid card sends.
A kind of expanding system, comprising: rfid card, expanding unit and reading head arrangement; Described reading head arrangement obtains downgoing signal, and described downgoing signal is sent to expanding unit, and described downgoing signal mixed frequency signal and local oscillation signal is carried out conjunction rood arrive; Described expanding unit receives the downgoing signal that reading head arrangement sends, and by the described downgoing signal reduction received, and the downgoing signal of reduction is sent to rfid card; Described rfid card responds the downgoing signal that described expanding unit sends, and upward signal is sent to described reading head arrangement.
As can be seen from the above technical solutions, the embodiment of the present invention has the following advantages:
The embodiment of the present invention adopt receive that reading head arrangement sends by the first local oscillation signal and the first mixed frequency signal close rood to downgoing signal, this downgoing signal is reduced, and send to rfid card, rfid card is made to respond this downgoing signal and upward signal is sent to reading head arrangement, the present embodiment can change the channel of downgoing signal, realize uplink and downlink signal and divide transmission, the sensitivity of read head can be improved, while expansion read range, ensure that reading efficiency, reduce the usage quantity of read head.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme of the embodiment of the present invention, below the accompanying drawing used required in describing embodiment is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those skilled in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is a schematic diagram of the extended method of read head in the embodiment of the present invention;
Fig. 2 is another schematic diagram of the extended method of read head in the embodiment of the present invention;
Fig. 3 is another schematic diagram of the extended method of read head in the embodiment of the present invention;
Fig. 4 is a structural drawing of expanding unit in the embodiment of the present invention;
Fig. 5 is the schematic diagram of expanding unit in the embodiment of the present invention;
Fig. 6 is a structural drawing of reading head arrangement in the embodiment of the present invention;
Fig. 7 is the schematic diagram of reading head arrangement in the embodiment of the present invention;
Fig. 8 is a structural drawing of expanding system in the embodiment of the present invention;
Fig. 9 is the schematic diagram of rfid card in the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those skilled in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Embodiments provide a kind of extended method of read head, for improving the sensitivity of read head, ensureing reading efficiency, reducing the usage quantity of read head.The embodiment of the present invention also provides corresponding expanding system, and relevant apparatus.Below describe in detail respectively.Refer to Fig. 1 to Fig. 9:
Embodiment one
Present embodiments provide a kind of extended method of read head, wherein, the angle from expanding unit is described by the present embodiment, specifically can be as follows:
A kind of extended method of read head, comprise: receive the downgoing signal that reading head arrangement sends, downgoing signal the first local oscillation signal and the first frequency variation signal is carried out conjunction rood arrive, downgoing signal is reduced, and the downgoing signal of reduction is sent to radio frequency discrimination RFID card, make rfid card respond and upward signal is sent to reading head arrangement.
Refer to Fig. 1, idiographic flow can be as follows:
101, receive the downgoing signal that reading head arrangement sends, downgoing signal the first local oscillation signal and the first frequency variation signal is carried out conjunction rood arrive;
Reading head arrangement can obtain the first local oscillation signal and the first frequency variation signal, and the first local oscillation signal and the first frequency variation signal are carried out conjunction road, obtain the downgoing signal after closing road, and this downgoing signal is sent to expanding unit, wherein, downgoing signal can be sent by antenna.
102, the downgoing signal reduction will received;
Wherein, the downgoing signal received reduces by expanding unit, obtains the downgoing signal reduced.
Concrete, can reduce to the downgoing signal received in the following manner: first the downgoing signal received is carried out shunt, obtain the second local oscillation signal and the second frequency variation signal, second local oscillation signal is coupled, the second local oscillation signal after coupling and the second frequency variation signal are carried out mixing, obtains the downgoing signal reduced.
Optionally, after the second local oscillation signal after coupling and the second frequency variation signal are carried out mixing, filtering and amplification can also be carried out to the second local oscillation signal after mixing and the second frequency variation signal, obtain the downgoing signal of the reduction after filter and amplification.
Wherein, in order to take corresponding compensate function to downgoing signal, ensure the stability of downgoing signal, before the second local oscillation signal after coupling and the second frequency variation signal are carried out mixing, adopt ALC control circuit to compensate downgoing signal, also make the second local oscillation signal and the second frequency variation signal can increase an amplifying circuit before mixing to improve the sensitivity of Signal reception.
Wherein, Automatic level control is carried out to downgoing signal, specifically comprise: whether detection local oscillation power equals the second local oscillation signal is carried out being coupled and carries out the mixing power of mixing with the second frequency variation signal, if, the pad value of locking downgoing signal, if not, local oscillation power is adjusted to and equals mixing power, and lock the pad value of downgoing signal.
103, the downgoing signal of reduction is sent to rfid card, make rfid card respond and upward signal is sent to reading head arrangement.
The downgoing signal of reduction is sent to rfid card by expanding unit, less downgoing signal of decaying can be obtained, after rfid card receives downgoing signal, by upward signal, the information be stored in wherein can be returned to reading head arrangement, make reading head arrangement can obtain the information of rfid card, and make a response.
As from the foregoing, the embodiment of the present invention adopt receive that reading head arrangement sends by the first local oscillation signal and the first mixed frequency signal close rood to downgoing signal, this downgoing signal is reduced, and send to rfid card, rfid card is made to respond this downgoing signal and upward signal is sent to reading head arrangement, embodiment adds expanding unit, this expanding unit can reduce downgoing signal, the present embodiment can change the channel of downgoing signal, realize uplink and downlink signal and divide transmission, the probability making downgoing signal scurry into upward signal reduces greatly, the sensitivity of read head can be improved, reading efficiency is ensure that while expansion read range, and reduce the usage quantity of read head.
Embodiment two
Present embodiments provide a kind of extended method of read head, wherein, the angle from reading head arrangement is described by the present embodiment, specifically can be as follows:
A kind of extended method of read head, comprise: obtain the first local oscillation signal and the first frequency variation signal, and the first local oscillation signal and the first frequency variation signal are carried out conjunction road, obtain the downgoing signal after closing road, downgoing signal after closing road is sent to expanding unit, downgoing signal is reduced by expanding unit, and the downgoing signal of reduction is sent to rfid card, make rfid card response concurrent send upward signal, receive the upward signal that rfid card sends.
Refer to Fig. 2, idiographic flow can be as follows:
201, obtain the first local oscillation signal and the first frequency variation signal, and the first local oscillation signal and the first frequency variation signal are carried out conjunction road, obtain the downgoing signal after closing road;
Wherein, the read head of reading head arrangement can send a signal, and this signal can obtain a frequency variation signal through the mixting circuit of reading head arrangement, and wherein, for convenience, the present embodiment describes it as the first frequency variation signal; This signal that read head sends can obtain a local oscillation signal through local oscillator, and wherein, for convenience, the present embodiment describes it as the first local oscillation signal.After reading head arrangement obtains the first frequency variation signal and the first local oscillation signal, with a combiner, the first frequency variation signal and the first local oscillation signal just can be closed road, obtain the downgoing signal after closing road.
Wherein, in order to amplifying signal, before conjunction road, the first frequency variation signal and the first local oscillation signal can be carried out signal amplification respectively through an amplifying circuit.
Optionally, before acquisition first local oscillation signal and the first frequency variation signal, first can start reading head arrangement, such as, read head can be started in the following manner:
First lock local oscillator, then judge whether expanding unit is opened according to local oscillator, if expanding unit is opened, then start reading head arrangement, and obtain the first mixed frequency signal and the first local oscillation signal; If expanding unit is not opened, then start expanding unit and start reading head arrangement, and obtaining the first mixed frequency signal and the first local oscillation signal.
202, the downgoing signal behind conjunction road is sent to expanding unit, downgoing signal is reduced by expanding unit, and the downgoing signal of reduction is sent to rfid card, make rfid card response concurrent send upward signal;
Optionally, by antenna, the downgoing signal behind conjunction road can be sent to expanding unit, make the downgoing signal reduction that expanding unit can receive, and the downgoing signal of reduction is sent to rfid card, make rfid card response concurrent send upward signal.
Wherein, in order to improve the sensitivity of upward signal, sending after upward signal to reading head arrangement at rfid card, can amplify through an amplifying circuit the upward signal that rfid card sends.
203, the upward signal that rfid card sends is received.
Reading head arrangement can obtain the information stored in rfid card, and makes a response according to the information obtained.
As from the foregoing, the embodiment of the present invention adopts reading head arrangement to obtain the first local oscillation signal and the first frequency variation signal, and the first local oscillation signal and the first frequency variation signal are carried out conjunction road, obtain the downgoing signal after closing road, downgoing signal after closing road is sent to expanding unit, downgoing signal is reduced by expanding unit, and the downgoing signal of reduction is sent to rfid card, rfid card response concurrent is made to send upward signal, receive the upward signal that rfid card sends, embodiment adds expanding unit, this expanding unit can reduce downgoing signal, the present embodiment can change the channel of downgoing signal, realize uplink and downlink signal and divide transmission, the probability making downgoing signal scurry into upward signal reduces greatly, the sensitivity of read head can be improved, reading efficiency is ensure that while expansion read range, and reduce the usage quantity of read head, and amplifying circuit can be added to improve receiving sensitivity at upward signal.
Embodiment three
The present embodiment will be described in detail the embodiment of the present invention in conjunction with reading head arrangement and expanding unit, specific as follows, refer to Fig. 3:
301, reading head arrangement obtains the first local oscillation signal and the first frequency variation signal, and the first local oscillation signal and the first frequency variation signal are carried out conjunction road, obtains the downgoing signal after closing road;
302, the downgoing signal behind conjunction road is sent to expanding unit by reading head arrangement;
303, expanding unit receives the downgoing signal that reading head arrangement sends;
304, downgoing signal reduces by expanding unit, and the downgoing signal of reduction is sent to rfid card;
Wherein, rfid card responds and upward signal is sent to reading head arrangement;
305, reading head arrangement receives the upward signal that rfid card sends, and the signal completing rfid card and read head is mutual.
It should be noted that, concrete enforcement see above-described embodiment, can repeat no more herein.
As from the foregoing, the embodiment of the present invention can change the channel of downgoing signal, realize uplink and downlink signal and divide transmission, the probability making downgoing signal scurry into upward signal reduces greatly, the sensitivity of read head can be improved, while expansion read range, ensure that reading efficiency, and reduce the usage quantity of read head, and amplifying circuit can be added to improve receiving sensitivity at upward signal.
Embodiment four
Present embodiments provide a kind of expanding unit of read head.Such as, this expanding unit is specifically as follows the expansion module of radio-frequency card reader, it should be noted that, does not specifically limit this expanding unit.Wherein, refer to Fig. 4, this expanding unit specifically can comprise: antenna 20, processor 40 and antenna 24.
Wherein, antenna 20, may be used for the downgoing signal receiving reading head arrangement transmission, downgoing signal the first local oscillation signal and the first frequency variation signal is carried out conjunction rood arrive;
Wherein, processor 40, may be used for the downgoing signal reduction received by antenna 20;
Wherein, antenna 24, the downgoing signal that may be used for processor 40 reduces sends to rfid card, makes rfid card respond and upward signal is sent to reading head arrangement.
Wherein, can reduce to the downgoing signal received in the following manner: first the downgoing signal received is carried out shunt, obtain the second local oscillation signal and the second frequency variation signal, second local oscillation signal is coupled, the second local oscillation signal after coupling and the second frequency variation signal are carried out mixing, obtains the downgoing signal reduced.
Concrete, refer to Fig. 5, Fig. 5 is a schematic diagram of expanding unit in the present embodiment, and optionally, processor 40 can comprise: shunt 15, coupling mechanism 27 and frequency mixer 19.
Optionally, one end of shunt 15 output terminal is connected with coupling mechanism 27, and the other end is connected with frequency mixer 19, and coupling mechanism 27 is connected with frequency mixer 19;
Optionally, shunt 15, for downgoing signal is carried out shunt, obtains the second local oscillation signal and the second frequency variation signal;
Optionally, coupling mechanism 27, for being coupled the second local oscillation signal after shunt 15 shunt;
Optionally, frequency mixer 19, carries out mixing for the second local oscillation signal after being coupled by coupling mechanism 27 and the second frequency variation signal, obtains the downgoing signal reduced.
Optionally, after the second local oscillation signal after coupling and the second frequency variation signal are carried out mixing, filtering and amplification can also be carried out to the second local oscillation signal after mixing and the second frequency variation signal, obtain the downgoing signal of the reduction after filter and amplification.
Wherein, refer to Fig. 5, processor 40 can also comprise: wave filter 28 and power amplifier 18.Optionally, wave filter 28, for carrying out filtering to the second local oscillation signal after mixing and the second frequency variation signal, power amplifier 18 is for amplifying filtered second local oscillation signal of wave filter 28 and the second frequency variation signal.
Wherein, in order to take corresponding compensate function to downgoing signal, ensure the stability of downgoing signal, before the second local oscillation signal after coupling and the second frequency variation signal are carried out mixing, adopt ALC control circuit to compensate downgoing signal, also make the second local oscillation signal and the second frequency variation signal can increase an amplifying circuit before mixing to improve the sensitivity of Signal reception.
Wherein, processor 40 can also comprise ALC control circuit 13, ALC control circuit 13 can carry out Automatic level control to downgoing signal, wherein, ALC control circuit 13 specifically can detect local oscillation power and whether equal the second local oscillation signal and carry out being coupled and carry out the mixing power of mixing with the second frequency variation signal, if, the pad value of locking downgoing signal, if not, local oscillation power is adjusted to and equals mixing power, and lock the pad value of downgoing signal.
It should be noted that, concrete enforcement see above-described embodiment, can repeat no more herein.
As from the foregoing, the embodiment of the present invention adopt antenna 20 to receive reading head arrangement sends by the first local oscillation signal and the first mixed frequency signal close rood to downgoing signal, downgoing signal reduction receiving element 401 antenna 20 received by processor 40, and send to rfid card by antenna 24, rfid card is made to respond this downgoing signal and upward signal is sent to reading head arrangement, embodiment adds expanding unit, this expanding unit can reduce downgoing signal, the present embodiment can change the channel of downgoing signal, realize uplink and downlink signal and divide transmission, the probability making downgoing signal scurry into upward signal reduces greatly, the sensitivity of read head can be improved, reading efficiency is ensure that while expansion read range, and reduce the usage quantity of read head.
Embodiment five
Present embodiments provide a kind of reading head arrangement.Such as, this reading head arrangement is specifically as follows the read head module of radio-frequency card reader, it should be noted that, does not specifically limit this reading head arrangement.Wherein, refer to Fig. 6, this reading head arrangement specifically can comprise: combiner 4, antenna 9 and RFID read head 1.
Wherein, combiner 4, may be used for acquisition first local oscillation signal and the first frequency variation signal, and the first local oscillation signal and the first frequency variation signal are carried out conjunction road, obtains the downgoing signal after closing road;
Wherein, antenna 9, may be used for that combiner 4 is closed the downgoing signal behind road and sends to expanding unit, downgoing signal is reduced by expanding unit, and the downgoing signal of reduction is sent to radio frequency discrimination RFID card, make rfid card response concurrent send upward signal;
Wherein, RFID read head 1, may be used for the upward signal receiving rfid card transmission.
Optionally, refer to Fig. 7, Fig. 7 is a schematic diagram of reading head arrangement in the present embodiment, and wherein, the reading head arrangement in the present embodiment can also comprise: mixting circuit 2, mixing amplifying circuit 3, local oscillation circuit 8 and local oscillator amplifying circuit 10.
Wherein, the read head of reading head arrangement can send a signal, and this signal can obtain first frequency variation signal through the mixting circuit of reading head arrangement; This signal that read head sends can obtain first local oscillation signal through local oscillator.After reading head arrangement obtains the first frequency variation signal and the first local oscillation signal, with a combiner, the first frequency variation signal and the first local oscillation signal just can be closed road, obtain the downgoing signal after closing road.Wherein, in order to amplifying signal, before conjunction road, the first frequency variation signal and the first local oscillation signal can be carried out signal amplification respectively through an amplifying circuit.
Concrete, one end of mixting circuit 2 is connected with RFID read head 1, and the other end is connected with mixing amplifying circuit 3, and mixting circuit 2 is for generating the first frequency variation signal;
One end of local oscillation circuit 8 is connected with RFID read head 1, and the other end is connected with local oscillator amplifying circuit 10, and local oscillation circuit 8 is for generating the first local oscillation signal;
Mixing amplifying circuit 3 is for amplifying the first frequency variation signal, and mixing amplifying circuit 3 is for amplifying the first local oscillation signal.
In addition, refer to Fig. 7, the present embodiment can also comprise: amplifying circuit 6 and starter.
Wherein, in order to improve the sensitivity of upward signal, send after upward signal to reading head arrangement at rfid card, can amplify through an amplifying circuit the upward signal that rfid card sends, that is amplifying circuit 6 amplifies for the upward signal sent rfid card; Starter, for locking local oscillator, and judges whether expanding unit is opened, if expanding unit is opened, then starts reading head arrangement, if expanding unit is not opened, then starts expanding unit and starts reading head arrangement.
It should be noted that, concrete enforcement see above-described embodiment, can repeat no more herein.
As from the foregoing, the embodiment of the present invention adopts combiner 4 to obtain the first local oscillation signal and the first frequency variation signal, and the first local oscillation signal and the first frequency variation signal are carried out conjunction road, obtain the downgoing signal after closing road, by antenna 92, combiner 4 is closed the downgoing signal behind road and send to expanding unit, downgoing signal is reduced by expanding unit, and the downgoing signal of reduction is sent to rfid card, rfid card response concurrent is made to send upward signal, the upward signal of rfid card transmission is received by RFID read head 1, embodiment adds expanding unit, this expanding unit can reduce downgoing signal, the present embodiment can change the channel of downgoing signal, realize uplink and downlink signal and divide transmission, the probability making downgoing signal scurry into upward signal reduces greatly, the sensitivity of read head can be improved, reading efficiency is ensure that while expansion read range, and reduce the usage quantity of read head, and amplifying circuit can be added to improve receiving sensitivity at upward signal.
Embodiment six
Present embodiments provide a kind of expanding system.Such as, this expanding system is specifically as follows access control system, it should be noted that, does not specifically limit this expanding system.Wherein, refer to Fig. 8, this expanding system specifically can comprise: reading head arrangement 601, expanding unit 602 and rfid card 603;
Wherein, reading head arrangement 601 obtains downgoing signal, and downgoing signal is sent to expanding unit 602, and downgoing signal mixed frequency signal and local oscillation signal is carried out conjunction rood arrive, and wherein, reading head arrangement 601 specifically can see Fig. 7;
Expanding unit 602 receives the downgoing signal that reading head arrangement 601 sends, and by the downgoing signal reduction received, and the downgoing signal of reduction is sent to rfid card, wherein, expanding unit 602 specifically can see Fig. 5;
Rfid card 603 responds the downgoing signal that expanding unit 602 sends, and upward signal is sent to reading head arrangement 601.Such as, rfid card can be access card, it should be noted that, does not specifically limit this rfid card, and wherein, rfid card 603 specifically can see Fig. 9.
It should be noted that, reading head arrangement 601 in the present embodiment can be any one reading head arrangement in above-described embodiment, and the expanding unit 602 in the present embodiment can be any one expanding unit in above-described embodiment, wherein, concrete enforcement see above-described embodiment, can repeat no more herein.
Wherein, below by illustrate briefly the execution flow process of this expanding system, as follows:
Step one, reading head arrangement 601 obtain the first local oscillation signal and the first frequency variation signal, and the first local oscillation signal and the first frequency variation signal are carried out conjunction road, obtain the downgoing signal after closing road;
Downgoing signal behind conjunction road is sent to expanding unit 602 by step 2, reading head arrangement 601;
Step 3, expanding unit 602 receive the downgoing signal that reading head arrangement 601 sends;
Downgoing signal reduces by step 4, expanding unit 602, and the downgoing signal of reduction is sent to rfid card 603;
Wherein, rfid card 603 responds and upward signal is sent to reading head arrangement 601;
Step 5, reading head arrangement 601 receive the upward signal that rfid card 603 sends, and the signal completing rfid card and RFID read head is mutual.
As from the foregoing, the expanding system of the present embodiment adds expanding unit 602, this expanding unit 602 can reduce downgoing signal, the expanding system of the present embodiment can change the channel of downgoing signal, realize uplink and downlink signal and divide transmission, the probability making downgoing signal scurry into upward signal reduces greatly, the sensitivity of read head can be improved, reading efficiency is ensure that while expansion read range, and reduce the usage quantity of read head, and amplifying circuit can be added to improve receiving sensitivity at upward signal.
Embodiment seven
With an embody rule example, technical scheme of the present invention is described in detail below, such as, specifically can be as follows:
The reading head arrangement of the present embodiment can as shown in Figure 7, and this reading head arrangement specifically can comprise: RFID read head 1, mixting circuit 2, the descending amplifying circuit of read head 3, combiner 4, read head coupled circuit 5, the up amplifying circuit 6 of read head, digital transmission module 7, local oscillation circuit 8, local oscillator amplifying circuit 10 and read head antenna 9.
Wherein, RFID read head 1 is connected to mixting circuit 2 and descending amplifying circuit 3, is connected to local oscillation circuit 8 and signal amplification circuit 10 thereof, is connected to up amplifying circuit 6, is connected to number and conducts electricity road 7; Wherein, combiner 4 is connected to coupled circuit 5 and antenna 9, is connected to descending amplifying circuit 3, descending local oscillation circuit 10 and up amplifying circuit 6.
The expanding unit of the present embodiment can as shown in Figure 5, and expanding unit specifically can comprise: antenna 20, expanding unit end entrance coupled circuit 11, attenuator circuit 12, shunt 15, descending frequency variation signal amplifying circuit 16, descending local oscillator amplifying circuit 17, mixting circuit 19, filtering circuit 28, power amplifier 18, local oscillation signal coupled circuit 27, detecting circuit 14, Automatic level control ALC control circuit 13, several conduct electricity road 21, monolithic control system 22, power-supply management system 23, rfid card antenna 25 and rfid card 26.
The rfid card of the present embodiment as shown in Figure 9, comprises antenna 25 and rfid card.
Wherein, the shunt 15 in expanding unit is connected to attenuator circuit 12, coupled circuit 11 and ALC control circuit 13, is also connected to down mixes signal amplification circuit 16 and mixting circuit 19, is connected to descending local oscillator amplifying circuit 17 and coupled circuit 27.Wherein, mixting circuit 19 is connected to coupled circuit 27, and filtering circuit 28 and power amplifier 18 and antenna 24, monolithic system 22 is connected to digital transmission module 21 and power management module 23.
Wherein, the power supply tube portion of the RFID read head 1 in reading head arrangement can be powered to RFID read head module 2, mixting circuit 2, mixing amplifying circuit 3, local oscillation circuit 8, local oscillator amplifying circuit 10 and up amplifying circuit 7.
Wherein, the power management 23 in expanding unit can to digital transmission module 21, Single Chip Microcomputer (SCM) system 22, ALC control circuit 13, detecting circuit 14, amplifying circuit 16, amplifying circuit 17, mixting circuit 19 and power amplifier 18 are powered.
In work process, first reading head arrangement be can start, the first mixed frequency signal and the first local oscillation signal then obtained.
Wherein, corresponding compensate function can be taked by ALC control circuit 13 pairs of downgoing signals, ensure the stability of downgoing signal, also make the second local oscillation signal and the second frequency variation signal can increase an amplifying circuit before mixing to improve the sensitivity of Signal reception.
Such as, RFID read head 1 sends a signal, it can be such as the signal of a transmission 922M, the frequency variation signal of a 2.4G can be obtained after mixting circuit 2 shift frequency, amplified by amplifying circuit 3 again, this signal that RFID sends is after local oscillator 8, first local oscillation signal can be obtained, first local oscillation signal and the first frequency variation signal are closed road by combiner 4, obtain the downgoing signal behind a Ge He road, then by antenna 9, this downgoing signal is sent to expanding unit, antenna 20 in expanding unit receives the downgoing signal that reading head arrangement sends, successively by shunt 15 along separate routes, amplifying circuit 16 amplifies, mixting circuit 19 reduces RFID signal, the signal of the 915M of a reduction can be obtained, and can circuit 28 filtering after filtering, after power amplifier 18 amplifies, by antenna 24, this downgoing signal reduced is transmitted to rfid card, the RFID antenna 25 of rfid card receives the downgoing signal of the 915M of this reduction, rfid card 26 responds this downgoing signal and launches a upward signal to reading head arrangement by antenna 25, the antenna 9 of reading head arrangement receives this upward signal, by combiner 4, by amplifying circuit 6 amplifying signal, RFID read head 1 in reading head arrangement receives this upward signal.
One of ordinary skill in the art will appreciate that all or part of step realized in above-described embodiment method is that the hardware that can carry out instruction relevant by program completes, program can be stored in a kind of computer-readable recording medium, the above-mentioned storage medium mentioned can be ROM (read-only memory), disk or CD etc.
Above the extended method of a kind of read head provided by the present invention, device and system are described in detail, apply specific case herein to set forth principle of the present invention and embodiment, the explanation of above embodiment just understands method of the present invention and core concept thereof for helping; Meanwhile, for those skilled in the art, according to the thought of the embodiment of the present invention, all will change in specific embodiments and applications, to sum up, this description should not be construed as limitation of the present invention.
Claims (13)
1. an extended method for reading head arrangement, is characterized in that, comprising:
Receive the downgoing signal that described reading head arrangement sends, described downgoing signal the first local oscillation signal and the first frequency variation signal is carried out conjunction rood arrive;
Described downgoing signal is reduced, and the downgoing signal of described reduction is sent to radio frequency discrimination RFID card, make described rfid card respond and upward signal is sent to described reading head arrangement;
Wherein, described described downgoing signal to be reduced, specifically comprises:
Described downgoing signal is carried out shunt, obtains the second local oscillation signal and the second frequency variation signal;
Second local oscillation signal carried out being coupled and carries out mixing with the second frequency variation signal, obtaining the downgoing signal of described reduction.
2. method according to claim 1, is characterized in that, is carried out being coupled by the second local oscillation signal and after carrying out mixing with the second frequency variation signal described, described in obtain the downgoing signal of described reduction before, also comprise:
Filtering and amplification are carried out to the second local oscillation signal after described mixing and the second frequency variation signal.
3. method according to claim 1 and 2, is characterized in that, before described downgoing signal reduction, also comprises: carry out Automatic level control to described downgoing signal;
Described Automatic level control is carried out to described downgoing signal, specifically comprises:
Whether detection local oscillation power equals the second local oscillation signal is carried out being coupled and carries out the mixing power of mixing with the second frequency variation signal, if so, the pad value of described downgoing signal is locked, if not, described local oscillation power is adjusted to and equals described mixing power, and lock the pad value of described downgoing signal.
4. an extended method for read head, is characterized in that, comprising:
Obtain the first local oscillation signal and the first frequency variation signal, and described first local oscillation signal and the first frequency variation signal are carried out conjunction road, obtain the downgoing signal after closing road;
Downgoing signal behind described conjunction road is sent to expanding unit, described downgoing signal is reduced by expanding unit, and the downgoing signal of reduction is sent to radio frequency discrimination RFID card, make described rfid card response concurrent send upward signal;
Receive the upward signal that described rfid card sends;
Wherein, described downgoing signal reduction specifically comprises by expanding unit:
Described downgoing signal is carried out shunt, obtains the second local oscillation signal and the second frequency variation signal;
Second local oscillation signal carried out being coupled and carries out mixing with the second frequency variation signal, obtaining the downgoing signal of described reduction.
5. method according to claim 4, is characterized in that, before the upward signal that described reception rfid card sends, also comprises:
The upward signal that described rfid card sends is amplified.
6. the method according to claim 4 or 5, is characterized in that, before described acquisition first mixed frequency signal and the first local oscillation signal, also comprises:
Locking local oscillator;
Judge whether expanding unit is opened according to local oscillator, if described expanding unit is opened, then start reading head arrangement, and perform the step of described acquisition first mixed frequency signal and the first local oscillation signal, if expanding unit is not opened, then start expanding unit and start reading head arrangement, and performing the step of described acquisition first mixed frequency signal and the first local oscillation signal.
7. an expanding unit, is characterized in that, comprising:
First antenna (20), processor (40) and the second antenna (24);
Described first antenna (20), for receiving the downgoing signal that reading head arrangement sends, described downgoing signal the first local oscillation signal and the first frequency variation signal is carried out conjunction rood arrive;
Described processor (40), for the downgoing signal reduction received by the first antenna (20);
Described second antenna (24), sends to radio frequency discrimination RFID card for the downgoing signal reduced by processor (40), makes described rfid card respond and upward signal is sent to described reading head arrangement;
Wherein,
Described processor (40) comprising: shunt (15), coupling mechanism (27) and frequency mixer (19);
One end of described shunt (15) output terminal is connected with described coupling mechanism (27), and the other end is connected with described frequency mixer (19), and described coupling mechanism (27) is connected with described frequency mixer (19);
Described shunt (15), for described downgoing signal is carried out shunt, obtains the second local oscillation signal and the second frequency variation signal;
Described coupling mechanism (27), for being coupled the second local oscillation signal after shunt (15) shunt;
Described frequency mixer (19), for the second local oscillation signal after described coupling mechanism (27) coupling and the second frequency variation signal are carried out mixing, obtains the downgoing signal of described reduction.
8. device according to claim 7, is characterized in that,
Described processor (40) also comprises: wave filter (28) and power amplifier (18);
Described wave filter (28), for carrying out filtering to the second local oscillation signal after described mixing and the second frequency variation signal;
Described power amplifier (18) is for amplifying filtered second local oscillation signal of described wave filter (28) and the second frequency variation signal.
9. the device according to claim 7 or 8, is characterized in that,
Also comprise: for carrying out the ALC control circuit (13) of Automatic level control to described downgoing signal;
Wherein, described ALC control circuit (13), whether equal the second local oscillation signal specifically for detection local oscillation power carry out being coupled and carry out the mixing power of mixing with the second frequency variation signal, if, lock the pad value of described downgoing signal, if not, described local oscillation power is adjusted to and equals described mixing power, and lock the pad value of described downgoing signal.
10. a reading head arrangement, is characterized in that, comprising:
Combiner (4), antenna (9) and RFID read head (1);
Described combiner (4), for obtaining the first local oscillation signal and the first frequency variation signal, and carries out conjunction road by described first local oscillation signal and the first frequency variation signal, obtains the downgoing signal after closing road;
Described antenna (9), expanding unit is sent to for the downgoing signal after described combiner (4) is closed road, described downgoing signal is reduced by expanding unit, and the downgoing signal of reduction is sent to radio frequency discrimination RFID card, make described rfid card response concurrent send upward signal;
Described RFID read head (1), for receiving the upward signal that rfid card sends;
Wherein, described described downgoing signal to be reduced, specifically comprises:
Described downgoing signal is carried out shunt, obtains the second local oscillation signal and the second frequency variation signal;
Second local oscillation signal carried out being coupled and carries out mixing with the second frequency variation signal, obtaining the downgoing signal of described reduction.
11. devices according to claim 10, is characterized in that,
Also comprise: mixting circuit (2), mixing amplifying circuit (3), local oscillation circuit (8) and local oscillator amplifying circuit (10);
One end of described mixting circuit (2) is connected with described RFID read head (1), and the other end is connected with described mixing amplifying circuit (3), and described mixting circuit (2) is for generating described first frequency variation signal;
One end of described local oscillation circuit (8) is connected with described RFID read head (1), and the other end is connected with described local oscillator amplifying circuit (10), and described local oscillation circuit (8) is for generating described first local oscillation signal;
Described mixing amplifying circuit (3) is for amplifying described first frequency variation signal, and described mixing amplifying circuit (3) is for amplifying described first local oscillation signal.
12. devices according to claim 10 or 11, is characterized in that, also comprise: amplifying circuit (6) and starter;
Described amplifying circuit (6) amplifies for the upward signal sent described rfid card;
According to local oscillator, described starter, for locking local oscillator, and judges whether described expanding unit is opened, if described expanding unit is opened, then start described reading head arrangement, if expanding unit is not opened, then starts expanding unit and starts reading head arrangement.
13. 1 kinds of expanding systems, is characterized in that, comprising:
Rfid card, the expanding unit according to any one of claim 7 to 8 and the reading head arrangement according to any one of claim 10 to 11;
Described reading head arrangement obtains downgoing signal, and described downgoing signal is sent to expanding unit, and described downgoing signal mixed frequency signal and local oscillation signal is carried out conjunction rood arrive;
Described expanding unit receives the downgoing signal that reading head arrangement sends, and by the described downgoing signal reduction received, and the downgoing signal of reduction is sent to rfid card;
Described rfid card responds the downgoing signal that described expanding unit sends, and upward signal is sent to described reading head arrangement;
Wherein, described by the described downgoing signal reduction received, specifically comprise:
Described downgoing signal is carried out shunt, obtains the second local oscillation signal and the second frequency variation signal;
Second local oscillation signal carried out being coupled and carries out mixing with the second frequency variation signal, obtaining the downgoing signal of described reduction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210236690.1A CN102842017B (en) | 2012-07-10 | 2012-07-10 | A kind of extended method of read head, device and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210236690.1A CN102842017B (en) | 2012-07-10 | 2012-07-10 | A kind of extended method of read head, device and system |
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| Publication Number | Publication Date |
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| CN102842017A CN102842017A (en) | 2012-12-26 |
| CN102842017B true CN102842017B (en) | 2015-10-28 |
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| CN201210236690.1A Expired - Fee Related CN102842017B (en) | 2012-07-10 | 2012-07-10 | A kind of extended method of read head, device and system |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101247162A (en) * | 2007-02-13 | 2008-08-20 | 杰脉通信技术(上海)有限公司 | TD-SCDMA indoor distribution system simulating intermediate frequency |
| CN201274467Y (en) * | 2008-08-08 | 2009-07-15 | 福建三元达通讯股份有限公司 | Indoor signal coverage system and repeater applied to the system |
| CN101715249A (en) * | 2009-12-07 | 2010-05-26 | 湖南工业大学 | Optical-fiber wireless system for full-duplex communication |
| CN202904590U (en) * | 2012-07-10 | 2013-04-24 | 深圳市捷顺科技实业股份有限公司 | Extending device, reading head device and reading head extending system |
-
2012
- 2012-07-10 CN CN201210236690.1A patent/CN102842017B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101247162A (en) * | 2007-02-13 | 2008-08-20 | 杰脉通信技术(上海)有限公司 | TD-SCDMA indoor distribution system simulating intermediate frequency |
| CN201274467Y (en) * | 2008-08-08 | 2009-07-15 | 福建三元达通讯股份有限公司 | Indoor signal coverage system and repeater applied to the system |
| CN101715249A (en) * | 2009-12-07 | 2010-05-26 | 湖南工业大学 | Optical-fiber wireless system for full-duplex communication |
| CN202904590U (en) * | 2012-07-10 | 2013-04-24 | 深圳市捷顺科技实业股份有限公司 | Extending device, reading head device and reading head extending system |
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| CN102842017A (en) | 2012-12-26 |
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