CN102750579A - RFID (Radio Frequency Identification Devices) label with flow and flow velocity detector, RFID system and flow and flow velocity detection method - Google Patents
RFID (Radio Frequency Identification Devices) label with flow and flow velocity detector, RFID system and flow and flow velocity detection method Download PDFInfo
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- CN102750579A CN102750579A CN2012101836632A CN201210183663A CN102750579A CN 102750579 A CN102750579 A CN 102750579A CN 2012101836632 A CN2012101836632 A CN 2012101836632A CN 201210183663 A CN201210183663 A CN 201210183663A CN 102750579 A CN102750579 A CN 102750579A
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Abstract
The invention provides an RFID (Radio Frequency Identification Devices) label with a flow and flow velocity detector, an RFID system and a flow and flow velocity detection method. Two pins are arranged on a chip of the RFID label; the flow and flow velocity detector is connected in parallel with an antenna of the RFID label, a logic circuit for controlling connection and disconnection is arranged on a line where the flow and flow velocity detector is connected with the chip of the RFID label, and the connected line and the logic circuit for controlling connection and disconnection are a part of the chip; when the logic circuit is disconnected, the flow and flow velocity detector is not connected in parallel with the antenna, and the first resonant frequency and signal intensity of the antenna remain unchanged after the flow and flow velocity detector is placed at certain flow and flow velocity after a time; when the logic circuit is connected, the flow and flow velocity detector is connected in parallel with the antenna, and the antenna works at a second resonant frequency after the flow and flow velocity detector is placed at certain flow and flow velocity level after a time; the RFID label receives a command sent by an RFID reader so as to control the connection and disconnection of the logic circuit, thus realizing detection on change of the flow and flow velocity through comparing the difference between signal intensity of different frequencies from the antenna. Through the invention, the change of the flow and flow velocity can be detected with lower cost.
Description
Technical field
The present invention relates to RFID (Radio Frequency Identification, RF identification) technical field, relate in particular to a kind of RFID label, rfid system and flow velocity detection method with the flow velocity pick-up unit.
Background technology
In recent years, rfid system had become more prevalent.Rfid system is mainly used in the identification to people and thing.In general, this system comprises a RFID reader at least, and the radiofrequency signal from one or more RFID labels can launched and accept to this RFID reader in the scope of a setting.This RFID label generally encapsulates, and can be attached on the object, and it comprises the microchip that an ability and antenna carry out information interchange.This microchip is an integrated circuit in general, and it can be used for storing and process information, the modulation radiofrequency signal, and can move other specific function.The antenna of RFID label is to be used for receiving and sending radiofrequency signal, and is applicable to a kind of special frequency usually.
In some equipment, when the flow velocity that the rfid system that has the flow velocity pick-up unit has been used to monitor product environment of living in has surpassed the acceptable flow velocity.In general these equipment requirements induction installations will have a lasting energy source, are used for detecting the change of flow velocity, but this can increase the cost of equipment.In addition, some equipment requirements induction installations also will link to each other with a comparator circuit, thereby detect the degree size that departs from reference voltage, and this requirement has increased the cost of equipment greatly.In a word, improve rfid system and be necessary, its requires when not using lasting energy source or use a kind of adjunct circuit cheaply, can be used for detecting flow velocity and changes.
Summary of the invention
The embodiment of the invention provides a kind of RFID label with the flow velocity pick-up unit, rfid system and flow velocity detection method, detects flow velocity at lower cost and changes.
On the one hand, the embodiment of the invention provides a kind of RFID label with the flow velocity pick-up unit, and two pins are arranged on the chip of said RFID label; Two pins of said flow velocity pick-up unit and this link to each other; And form parallel-connection structure with the antenna of said RFID label; The variation of extraneous flow velocity can cause the changes in resistance of flow velocity pick-up unit own; The logical circuit that a control break-make is arranged on said flow velocity pick-up unit and circuit that the chip of RFID label is connected; The circuit of this connection is the part of chip with the logical circuit of control break-make, the break-make of logical circuit determined the flow velocity pick-up unit whether with the sky line parallel: when logical circuit breaks off, the flow velocity pick-up unit not with the sky line parallel; Be placed on certain flow velocity after following a period of time of level this moment, and first resonant frequency and the signal intensity of antenna remain unchanged; When logical circuit is connected; A flow velocity pick-up unit and a day line parallel; Be placed on certain flow velocity after following a period of time of level this moment, and the characteristic frequency of antenna and signal intensity have one at least and change, and this moment, antenna was operated under second resonant frequency; Said RFID label receives the break-make of the instruction of RFID reader transmission with control logic circuit, thereby realizes detecting from the difference between the signal intensity of the different frequency of antenna through comparison the change of flow velocity.
Optional, in an embodiment of the present invention, the antenna of said RFID label is a monopole antenna.
Optional, in an embodiment of the present invention, the antenna of said RFID label is a double-doublet antenna: said flow velocity pick-up unit forms parallel-connection structure with antenna wherein; Perhaps said flow velocity pick-up unit and two antennas form parallel-connection structure simultaneously.
Optional, in an embodiment of the present invention, said flow velocity pick-up unit is a resistor-type flow velocity pick-up unit, said flow velocity pick-up unit comprises: heat-conducted flow monitor and other resistor-type flow velocity pick-up units.
On the other hand, the embodiment of the invention provides a kind of RFID label with the flow velocity pick-up unit, and a pin is arranged on the chip of said RFID label; One end of said flow velocity pick-up unit links to each other with this pin; The other end is connected on the antenna of said RFID label; And form parallel-connection structure with antenna; The variation of extraneous flow velocity can cause the changes in resistance of flow velocity pick-up unit own, and the logical circuit of a control break-make is arranged on said flow velocity pick-up unit and circuit that the chip of RFID label is connected, and the circuit of this connection and the logical circuit of controlling break-make are the parts of chip; The break-make of logical circuit determined the flow velocity pick-up unit whether with the sky line parallel: when logical circuit breaks off; The flow velocity pick-up unit not with the sky line parallel, this moment be placed on certain flow velocity after following a period of time of level, first resonant frequency and the signal intensity of antenna remain unchanged; When logical circuit is connected; A flow velocity pick-up unit and a day line parallel; Be placed on certain flow velocity after following a period of time of level this moment, and the characteristic frequency of antenna and signal intensity have one at least and change, and this moment, antenna was operated under second resonant frequency; Said RFID label receives the break-make of the instruction of RFID reader transmission with control logic circuit, thereby realizes detecting from the difference between the signal intensity of the different frequency of antenna through comparison the change of flow velocity.
Optional, in an embodiment of the present invention, the antenna of said RFID label is a monopole antenna.
Optional, in an embodiment of the present invention, the antenna of said RFID label is a double-doublet antenna: said flow velocity pick-up unit forms parallel-connection structure with antenna wherein; Perhaps said flow velocity pick-up unit and two antennas form parallel-connection structure simultaneously.
Optional, in an embodiment of the present invention, said flow velocity pick-up unit is a resistor-type flow velocity pick-up unit, said resistor-type flow velocity pick-up unit comprises: heat-conducted flow monitor and other resistor-type flow velocity pick-up units.
Another aspect; The embodiment of the invention provides a kind of RFID label with the flow velocity pick-up unit; Said flow velocity pick-up unit is connected on the antenna of said RFID label, and forms parallel-connection structure with antenna, and the variation of extraneous flow velocity can cause the changes in resistance of flow velocity pick-up unit own; The logical circuit that a control break-make is arranged on said flow velocity pick-up unit and circuit that antenna is connected; The circuit of this connection is the part of chip with the logical circuit of control break-make, the break-make of logical circuit determined the flow velocity pick-up unit whether with the sky line parallel: when logical circuit breaks off, the flow velocity pick-up unit not with the sky line parallel; Be placed on certain flow velocity after following a period of time of level this moment, and first resonant frequency and the signal intensity of antenna remain unchanged; When logical circuit is connected; A flow velocity pick-up unit and a day line parallel; Be placed on certain flow velocity after following a period of time of level this moment, and the characteristic frequency of antenna and signal intensity have one at least and change, and this moment, antenna was operated under second resonant frequency; Said RFID label receives the break-make of the instruction of RFID reader transmission with control logic circuit, thereby realizes detecting from the difference between the signal intensity of the different frequency of antenna through comparison the change of flow velocity.
Optional, in an embodiment of the present invention, the antenna of said RFID label is a monopole antenna.
Optional, in an embodiment of the present invention, the antenna of said RFID label is a double-doublet antenna: said flow velocity pick-up unit forms parallel-connection structure with antenna wherein; Perhaps said flow velocity pick-up unit and two antennas form parallel-connection structure simultaneously.
Optional, in an embodiment of the present invention, said flow velocity pick-up unit is a resistor-type flow velocity pick-up unit, said resistor-type flow velocity pick-up unit comprises: heat-conducted flow monitor and other resistor-type flow velocity pick-up units.
On the one hand, the embodiment of the invention provides a kind of rfid system with the flow velocity pick-up unit again, and said rfid system comprises RFID label and RFID reader, and said RFID label comprises the RFID label of above-mentioned band flow velocity pick-up unit; Said RFID reader sends the break-make of instruction with the logical circuit of control RFID label, thereby detects the change of flow velocity from the difference between the signal intensity of the different frequency of antenna through comparison.
Again on the one hand; The embodiment of the invention provides a kind of flow velocity detection method of the rfid system with the flow velocity pick-up unit; Said flow velocity detection method is applied to the rfid system of above-mentioned band flow velocity pick-up unit, comprising: send the break-make of instruction with the logical circuit of control RFID label through said RFID reader; Receive the break-make of the instruction of RFID reader transmission through the RFID label: when logical circuit breaks off with control logic circuit; The flow velocity pick-up unit not with the sky line parallel; Be placed on this moment under certain flow velocity intensity, and first resonant frequency and the signal intensity of antenna remain unchanged; When logical circuit was connected, the flow velocity pick-up unit was placed under certain flow velocity intensity with a day line parallel, this moment, and the characteristic frequency of antenna and signal intensity have one at least and change, and this moment, antenna was operated under second resonant frequency; Utilize the comparison of said RFID reader to detect the change of flow velocity from the difference between the signal intensity of the different frequency of antenna.
Technique scheme has following beneficial effect: because on the chip of employing RFID label two pins are arranged; The antenna of flow velocity pick-up unit and RFID label forms parallel-connection structure; The logical circuit that a control break-make is arranged on flow velocity pick-up unit and circuit that the chip of RFID label is connected; The circuit of this connection is the part of chip with the logical circuit of control break-make: when logical circuit breaks off; The flow velocity pick-up unit not with the sky line parallel, this moment be placed on certain flow velocity after following a period of time of level, first resonant frequency and the signal intensity of antenna remain unchanged; When logical circuit was connected, the flow velocity pick-up unit was placed on certain flow velocity after following a period of time of level with a day line parallel, this moment, and this moment, antenna was operated under second resonant frequency; The RFID label receives the break-make of the instruction of RFID reader transmission with control logic circuit; Thereby realize detecting from the difference between the signal intensity of the different frequency of antenna the technological means of the change of flow velocity through comparison; So reached and detected the technique effect that flow velocity changes at lower cost; And the energy that utilizes RFID to obtain, solved the powerup issue that flow velocity detects.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
The synoptic diagram that Fig. 1 is connected with the RFID label chip for embodiment of the invention flow velocity pick-up unit;
Fig. 2 is the equivalent circuit diagram of RFID label chip inside antenna;
Fig. 3 is the synoptic diagram that embodiment of the invention flow velocity pick-up unit, logic switch are connected with RFID label chip inside antenna equivalent electrical circuit;
The synoptic diagram that Fig. 4 directly is connected for embodiment of the invention flow velocity pick-up unit and RFID label antenna;
Fig. 5 is the structure key diagram of embodiment of the invention flow velocity pick-up unit;
Fig. 6 is the process flow diagram of the embodiment of the invention based on the flow velocity detection method of signal intensity.
Embodiment
To combine the accompanying drawing in the embodiment of the invention below, the technical scheme in the embodiment of the invention is carried out clear, intactly description, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.
The flow velocity pick-up unit of the embodiment of the invention links to each other with the chip of RFID label and has three kinds of situation at least:
The two pins structure:
The embodiment of the invention is a kind of device, system and technology that flow velocity changes that be used for detecting.This system has comprised a RFID label, and two pins are arranged on the chip of this RFID label.Two pins of flow velocity pick-up unit and this link to each other, and form parallel-connection structure with antenna.The variation of extraneous flow velocity can cause the changes in resistance of flow velocity pick-up unit own.The logical circuit of a control break-make is arranged on pin and circuit that chip is connected, and the circuit of this connection is the part of chip with the logical circuit of control break-make.
The break-make of logical circuit determined the flow velocity pick-up unit whether with the sky line parallel.When logical circuit breaks off, the flow velocity pick-up unit not with the sky line parallel, this moment be placed on certain following a period of time of flow velocity after, first resonant frequency and the signal intensity of antenna remain unchanged.When logical circuit is connected, a flow velocity pick-up unit and a day line parallel, be placed on certain following a period of time of flow velocity this moment after, the characteristic frequency of antenna and signal intensity have one at least and change, antenna is operated under second resonant frequency at this moment.The RFID reader can send the break-make of instruction control logical circuit to label, when logical circuit is connected, can detect the change of flow velocity through comparison from the difference between the signal intensity of the different frequency of antenna.
With regard to an instance, this system has comprised a RFID label, has only an antenna on this label.Two pins are arranged on the chip of this label.Two pins of flow velocity pick-up unit and this link to each other, and form parallel-connection structure with this root antenna.The logical circuit of a control break-make is arranged on pin and circuit that chip is connected, and the logical circuit of the circuit of this connection and control break-make is the part of chip.The variation of extraneous flow velocity can cause the changes in resistance of flow velocity pick-up unit own.
After when logical circuit is connected, being placed on certain following a period of time of flow velocity, the characteristic frequency of antenna and signal intensity have one at least and change, and this moment, antenna was operated under second resonant frequency.The RFID reader can send instruction to label, and the difference between the signal intensity of the different frequency during through the comparison logic break-make can detect the change of flow velocity.Or rather, the flow velocity pick-up unit should have lower resistance, and its instantiation comprises: heat-conducted flow monitor and other resistor-type flow velocity pick-up units etc.
With regard to another instance, this system has comprised a RFID label, and two antennas are arranged on this label.Two kinds of situation are arranged this moment.First kind of situation is that two pins of flow velocity pick-up unit and this link to each other, and forms parallel-connection structure with first antenna.The logical circuit of a control break-make is arranged on pin and circuit that chip is connected, and the logical circuit of the circuit of this connection and control break-make is the part of chip.The variation of extraneous flow velocity can cause the changes in resistance of flow velocity pick-up unit own.And second antenna is all the time with the first resonant frequency proper communication.
When logical circuit is connected, be placed on certain following a period of time of flow velocity after, the characteristic frequency of first antenna and signal intensity have at least a meeting to change, it is operated under second resonant frequency.The RFID reader can send instruction to label, and the difference between the signal intensity of the different frequency of first and second antennas can detect the change of flow velocity when connecting through comparison logic.Difference between the signal intensity of the different frequency during logical circuit break-make through second antenna self relatively also can detect the change of flow velocity.
Second kind of situation is that two pins of flow velocity pick-up unit and this link to each other, and form parallel-connection structure simultaneously with two antennas.The logical circuit of a control break-make is arranged on pin and circuit that chip is connected, and the logical circuit of the circuit of this connection and control break-make is the part of chip.The variation of extraneous flow velocity can cause the changes in resistance of flow velocity pick-up unit own.The situation that this and label only contain an antenna is similar.
After when logical circuit is connected, being placed on certain following a period of time of flow velocity, antenna features frequency and signal intensity have one at least and change, and it is operated under second resonant frequency.The RFID reader can send instruction to label, and the difference between the signal intensity of the different frequency during through the comparison logic break-make can detect the change of flow velocity.First kind of situation circuit connection is fairly simple, and the resonant frequency of two antennas maybe be different during work, can influence the precision of measurement.Second kind of situation circuit connects more complicated, but the resonant frequency of two antennas is consistent during work, and measuring accuracy is higher.Or rather, the flow velocity pick-up unit should have lower resistance, and its instantiation comprises: heat-conducted flow monitor and other resistor-type flow velocity pick-up units etc.
One pin configuration:
The chip of this label can only have a pin, and this pin outwards links to each other with an end of flow velocity pick-up unit, and the other end of flow velocity pick-up unit is directly linked on the antenna.Pin is similar in the situation of the tie point of chip internal and two pins, finally remains the purpose that will reach with day line parallel.Simultaneously on pin and circuit that the chip internal circuit is connected, a logical circuit of controlling break-make is arranged.When logical circuit breaks off, the flow velocity pick-up unit not with the sky line parallel, this moment be placed on certain following a period of time of flow velocity after, first resonant frequency and the signal intensity of antenna remain unchanged.
When logical circuit is connected, a flow velocity pick-up unit and a day line parallel, be placed on certain following a period of time of flow velocity this moment after, antenna features frequency and signal intensity have one at least and change, it is operated under second resonant frequency.The RFID reader can send the break-make of instruction control logical circuit to label, when logical circuit is connected, can detect the change of flow velocity through comparison from the difference between the signal intensity of the different frequency of antenna.
With regard to an instance, this system has comprised a RFID label, has only an antenna on this label.A pin is arranged on the chip of this label.The flow velocity pick-up unit links to each other with this pin, and the flow velocity pick-up unit other end is directly linked on the antenna, forms parallel-connection structure with antenna.The logical circuit of a control break-make is arranged on pin and circuit that chip is connected, and the logical circuit of the circuit of this connection and control break-make is the part of chip.The variation of extraneous flow velocity can cause the changes in resistance of flow velocity pick-up unit own.
After when logical circuit is connected, being placed on certain following a period of time of flow velocity, antenna is operated under second resonant frequency, and its characteristic frequency and signal intensity have one at least and change.The RFID reader can send instruction to label, and the difference between the signal intensity of the different frequency during through the comparison logic break-make can detect the change of flow velocity.Or rather, the flow velocity pick-up unit should have lower resistance, and its instantiation comprises: heat-conducted flow monitor and other resistor-type flow velocity pick-up units etc.
With regard to another instance, this system has comprised a RFID label, and two antennas are arranged on this label.A pin is arranged on the chip of this label.The flow velocity pick-up unit links to each other with this pin, and the flow velocity pick-up unit other end is directly linked on the antenna, forms parallel-connection structure with first antenna.The logical circuit of a control break-make is arranged on pin and circuit that chip is connected, and the logical circuit of the circuit of this connection and control break-make is the part of chip.The variation of extraneous flow velocity can cause the changes in resistance of flow velocity pick-up unit own.And second antenna is all the time with the first resonant frequency communication.
When logical circuit is connected, be placed on certain following a period of time of flow velocity after, first antenna is operated under second resonant frequency, its characteristic frequency and signal intensity have at least a meeting to change.The RFID reader can send instruction to label, and the difference between the signal intensity of the different frequency of first and second antennas can detect the change of flow velocity when connecting through comparison logic.Difference between the signal intensity of the different frequency during logical circuit break-make through first antenna self relatively also can detect the change of flow velocity.Or rather, the flow velocity pick-up unit should have lower resistance, and its instantiation comprises: heat-conducted flow monitor and other resistor-type flow velocity pick-up units etc.
No pin configuration:
When not having pin on the chip of RFID label, the flow velocity pick-up unit can directly be linked on the antenna.In this case, the antenna that links to each other with the flow velocity pick-up unit can not break away from the flow velocity pick-up unit and with normal frequency for communication.After being placed on certain following a period of time of flow velocity, the characteristic frequency of antenna and signal intensity have one at least and change.The RFID reader can send instruction to label apparatus, detects the change of flow velocity from the difference between the signal intensity of the different frequency of antenna through comparison.
With regard to an instance, this system has comprised a RFID label, and two antennas are arranged on this label.The flow velocity pick-up unit directly links to each other with first antenna, and second antenna do not link to each other with the flow velocity pick-up unit all the time with the first resonant frequency proper communication.After being placed on certain following a period of time of flow velocity, first antenna is operated under second resonant frequency, and its characteristic frequency and signal intensity have at least a meeting to change, and the characteristic frequency of second antenna and signal intensity are constant.The RFID reader can send instruction to label, and can detect the change of flow velocity through the difference between the signal intensity of the different frequency of first and second antennas relatively.Or rather, the flow velocity pick-up unit should have lower resistance, and its instantiation comprises: heat-conducted flow monitor and other resistor-type flow velocity pick-up units etc.
In the same way, can be with on the chip of antenna also and can not be with pin, can be with one also can be with a plurality of pins.The radical of antenna can be one, two or even many.Also can connect one or more flow velocity pick-up units accordingly, the model of flow velocity pick-up unit can be the same or different simultaneously.With regard to a kind of instantiation of device, after being placed on certain following a period of time of flow velocity, the characteristic frequency of the antenna that links to each other with the flow velocity pick-up unit and signal intensity have at least a meeting to change.The RFID reader can send instruction to label apparatus, detects the change of flow velocity from the difference between the signal intensity of the different frequency of antenna through comparison.
With regard to a kind of instantiation of flow velocity pick-up unit, the method for simultaneous comparison numerical value comprises that these are compared numerical value compares with most signal strength values.These signal strength values belong to different frequencies, and interrelate with the flow velocity value of majority, can detect the level of flow velocity simultaneously based on the above-mentioned comparison of mentioning.
Yet with regard to another aspect, a rfid system comprises a RFID label apparatus and a RFID reader device.This RFID label apparatus is used to send two kinds of signals, the signal when signal when promptly above-mentioned logical circuit breaks off and logical circuit are connected, and these two kinds of signals have at least a kind of meeting that the request that receives is responded.The RFID reader device is used for the RFID label apparatus is sent a request at least.Fiducial value between the signal strength values when reading device being installed being signal strength values and logical circuit in order accepting to connect and to break off from the logical circuit of label, and be converted into these fiducial values the varying level of flow velocity.
In an example, the antenna of RFID label links to each other with the flow velocity pick-up unit, and the logical circuit of a control break-make is arranged on this connection line.Under logical circuit break-make whether two kinds of situation, have two kinds of corresponding with it different frequencies with antenna.After logical circuit is connected and is positioned over certain following a period of time of flow velocity to this label apparatus, because the variation of resonant frequency, will produce the intensity level of two kinds of unlike signals.
In an example, the RFID label apparatus comprises first, second two antennas, and wherein first antenna launched first signal, and second antenna emission secondary signal.Better situation is; First antenna links to each other with the flow velocity pick-up unit; After this label apparatus is placed on certain following a period of time of flow velocity, because the variation of resonant frequency, will produce the different of secondary signal intensity level and first signal strength values.
On the one hand, the embodiment of the invention provides a kind of rfid system with the flow velocity pick-up unit again, and said rfid system comprises RFID label and RFID reader, and said RFID label comprises the RFID label of above-mentioned band flow velocity pick-up unit; Said RFID reader sends the break-make of instruction with the logical circuit of control RFID label, thereby detects the change of flow velocity from the difference between the signal intensity of the different frequency of antenna through comparison.
Again on the one hand; The embodiment of the invention provides a kind of flow velocity detection method of the rfid system with the flow velocity pick-up unit; Said flow velocity detection method is applied to the rfid system of above-mentioned band flow velocity pick-up unit, comprising: send the break-make of instruction with the logical circuit of control RFID label through said RFID reader; Receive the break-make of the instruction of RFID reader transmission through the RFID label: when logical circuit breaks off with control logic circuit; The flow velocity pick-up unit not with the sky line parallel; Be placed on this moment under certain flow velocity intensity, and first resonant frequency and the signal intensity of antenna remain unchanged; When logical circuit was connected, the flow velocity pick-up unit was placed under certain flow velocity intensity with a day line parallel, this moment, and the characteristic frequency of antenna and signal intensity have one at least and change, and this moment, antenna was operated under second resonant frequency; Utilize the comparison of said RFID reader to detect the change of flow velocity from the difference between the signal intensity of the different frequency of antenna.
As shown in Figure 1, the synoptic diagram of the flow velocity sensor label 10 that is connected with the RFID label chip for embodiment of the invention flow velocity pick-up unit.Among Fig. 1, label apparatus 10 comprises 13, two pins 16,17 of 15, one surface-mounted integrated circuits of a base and a double-doublet antenna 11,12.Two pins 16,17 are arranged on the surface-mounted integrated circuit 13, and these two pins outwards link to each other with flow velocity pick-up unit 14, and these two pins are parallelly connected with the equivalent electrical circuit of antenna at chip internal, and the logical circuit of a control break-make is arranged on the circuit that connects.Whether the break-make through logical circuit can Control Flow flow rate detection module be inserted in the chip circuit, thereby can influence the frequency of the antenna that links to each other with radio-frequency module.When logical circuit broke off, label antenna was with the first resonant frequency communication.When logical circuit is connected, be placed on certain following a period of time of flow velocity after, antenna is operated under second resonant frequency, its characteristic frequency and signal intensity have one at least and change.
In an example, transmitting terminal 11,12 is processed by one or more different low electrical resistant materials, and these materials have higher electric conductivity; Copper for example, silver, and aluminium; They link to each other with antenna 11,12 through two pins 16,17 with the above-mentioned flow velocity pick-up unit of mentioning; After antenna 11,12 was placed on certain following a period of time of flow velocity, the flow velocity pick-up unit can cause the variation of one or more transmitting terminal generation resonant frequencies.The frequency of the frequency of this variation and reception and transmission is all different.For example, after the flow velocity pick-up unit is positioned over certain following a period of time of flow velocity, will causes sending frequency and accept that at least one changes in the frequency.
In another example, the antenna frequencies value of setting at the beginning will be higher than the antenna frequencies under the certain flow flow velocity environment, and when reaching certain flow velocity, it will reduce then.In another example, the antenna frequencies of setting at the beginning is lower than the antenna frequencies under the certain flow flow velocity, and it will rise when reaching certain flow velocity.Can be used for such flow velocity pick-up unit of the present invention has: heat-conducted flow monitor and other resistor-type flow velocity pick-up units etc.
Type based on the flow velocity pick-up unit is different, and the flow velocity that causes changing possibly be that a specific flow velocity value also possibly be a scope of flow velocity value selectively.The length of time must cause the variation of antenna resonance frequency, and antenna quality also can cause different variations.The type of the flow velocity pick-up unit that for example, has on the antenna can influence the length that changes the antenna resonance frequency required time.
As shown in Figure 2, be the equivalent circuit diagram of RFID label antenna.In the alternating magnetic field that tag coil antenna entering read write line produces, the interaction between label antenna and the reading and writing device antenna just is similar to transformer.Both coils are equivalent to the primary coil and the secondary coil of transformer.Resonant tank by label antenna forms is as shown in Figure 2, comprises coil inductance (L), the stray capacitance (C of label antenna
p) and shunt capacitance (C
2), its resonance frequency does
C is C in the formula
pAnd C
2Parallelly connected equivalent capacity, R
1, R
2Equivalent resistance for circuit internal inductance coil and other devices.The carrier frequency that label and read write line two-way communication are used is exactly f.The tag antenna coil profile is very little when requiring; Be that area is little; And need certain operating distance, the aerial coil mutual induction amount that RFID label and read write line are asked just obviously can not practical requirement, can have the Ferrite Material of high permeability in the inner insertion of tag antenna coil; With the increase mutual induction amount, thus the little problem of compensating coil xsect.
As shown in Figure 3, be the synoptic diagram that is connected with RFID label antenna equivalent electrical circuit of logical circuit of embodiment of the invention flow velocity pick-up unit, control break-make.Resonant tank by label antenna forms is as shown in the figure, comprises coil inductance (L), the stray capacitance (C of label antenna
p) and shunt capacitance (C
2), its resonance frequency does
Formula C is C
pAnd C
2Parallelly connected equivalent capacity, R
1, R
2Equivalent resistance for circuit internal inductance coil and other devices.M is the variable resistor of representative flow velocity pick-up unit, and S is the logical circuit of control break-make.When logical circuit breaks off, the flow velocity pick-up unit not with the sky line parallel, this moment be placed on certain following a period of time of flow velocity after, first resonant frequency and the signal intensity of antenna remain unchanged.When logical circuit is connected, a flow velocity pick-up unit and a day line parallel, be placed on certain following a period of time of flow velocity this moment after, antenna is operated under second resonant frequency, its characteristic frequency and signal intensity have one at least and change.
As shown in Figure 4, can detect the sketch of the passive RFID tags device 40 that flow velocity changes for the embodiment of the invention.As shown in Figure 4, label apparatus 40 comprises 45, one integrated circuit 43 of a base and a double-doublet antenna 41,42.The flow velocity pick-up unit 44 that links to each other with antenna 42 will influence the resistance of antenna 42.The material that flow velocity pick-up unit 44 is suitable for can be controlled the frequency that any one had both been fixed a point according to any one current voltage in the antenna 41,42.With regard to an instance, fixing up an aerial wire 41,42 can make it produce resonance in identical frequency.With regard to another instance, fixing up an aerial wire 41,42 can make it produce resonance in different frequency.
In an example, transmitting terminal double- doublet antenna 41,42 is processed by one or more different low electrical resistant materials; These materials have higher electric conductivity, copper for example, silver; And aluminium, they link to each other with the above-mentioned flow velocity pick-up unit of mentioning, when antenna 41; 42 be placed on certain following a period of time of flow velocity after, the flow velocity pick-up unit can cause the variation of one or more transmitting terminal generation resonant frequencies, thereby causes a different frequency.The frequency of the variation of this frequency and reception and transmission is all different.For example, after the flow velocity pick-up unit is positioned over certain following a period of time of flow velocity, will causes sending frequency and accept that at least one changes in the frequency.
In another example, the antenna frequencies value of setting at the beginning will be higher than the antenna frequencies under the certain flow flow velocity environment, and when reaching certain flow velocity, it will reduce then.In another example, the antenna frequencies of setting at the beginning is lower than the antenna frequencies under the certain flow flow velocity, and it will rise when reaching certain flow velocity.The such flow velocity pick-up unit that can be used for this invention has: heat-conducted flow monitor and other resistor-type flow velocity pick-up units etc.
Type based on the flow velocity pick-up unit is different, and the flow velocity that causes changing possibly be that a specific flow velocity value also possibly be a scope of flow velocity value selectively.The length of time must cause the variation of antenna resonance frequency, and antenna quality also can cause different variations.The type of the flow velocity pick-up unit that for example, has on the antenna can influence the length that changes the antenna resonance frequency required time.
As shown in Figure 5, be heat-conducted flow monitor.51,52 is two electrodes, and when various fluids flowed in pipeline, the quality of interior moving fluid through given area of the heat of point-to-point transmission transmission and unit interval was directly proportional arbitrarily, can process heat-conducted flow monitor according to this principle.The thermal sensing element of experiencing gas flow rate is installed in the pipeline of circulated gases,, makes the thermal sensing element cooling because gas flow has been taken away the part heat, thereby the resistance of thermal sensing element is changed with electric current heat hot photosensitive elements Rt.The change in resistance of thermal sensing element and the flow velocity of gas have certain relation, so as long as measure the size of special photosensitive elements change in resistance, just can obtain the flow velocity of gas.The potentiometer of thermal sensing element Rt and measuring resistance, adjusting bridge balancing is formed metering circuit jointly.Before carrying out the measurement gas flow velocity, adjustment potentiometer Rp1 makes electric bridge be in equilibrium state, makes gauge outfit be designated as zero.Potentiometer Rp2 is used for regulating the initial working current of electric bridge, so that make the sensitivity of electric bridge be in a kind of suitable duty.The resistance of thermistor is consistent with the resistance of measuring resistance RB.Corresponding variation takes place with the variation of gas flow rate V in the resistance of thermal sensing element, makes electric bridge lose original balance and produces a unbalanced current signal, and the size of this signal and gas flow rate have certain corresponding relation.
As shown in Figure 6, for the embodiment of the invention detects a kind of method flow diagram that flow velocity changes through the label apparatus that uses many antennas.What need consider is, the above-mentioned device of mentioning uses a label integrated circuit to carry out and the exchanging of a plurality of antennas.
As shown in Figure 6,50, the RFID reader sends energy and instruction to label apparatus.52, logical circuit is in the state of disconnection at initial time, and label apparatus is with the antenna received energy and the instruction that do not link to each other with the flow velocity pick-up unit.54, the electromagnetic wave that label apparatus will carry energy is converted into a DC (direct current) voltage, thereby just can make label carry out the requirement of indication.And this conversion need be used a charge pump, and a rectification circuit perhaps interconnects it, perhaps will use other energy conversion device.56, label apparatus sends signal through the sky alignment reader that does not link to each other with the flow velocity pick-up unit.58, the energy intensity of receiving signal is measured and write down to reader.60, reader sends the instruction of connecting logical circuit to label apparatus.62, label apparatus is used the antenna transmission data that link to each other with the flow velocity pick-up unit.64, the energy intensity of signal is received in the reader measurement.66, reader calculated goes out the fiducial value of a reaction signal intensity.68, reader changes into different flow velocity values with fiducial value.With regard to an instance, reader can be set the signal that a time period is used for receiving label, if do not receive signal, reader will be recorded as 0 with signal intensity.
In this system, reader will compare its signal strength values with the label antenna that links to each other with the flow velocity pick-up unit from the signal strength values of the antenna that does not link to each other with the flow velocity pick-up unit as a reference value.Through receive from the signal that links to each other with the flow velocity pick-up unit with the transmitting terminal that does not link to each other with the flow velocity pick-up unit, reader can be collected the fiducial value of representing unlike signal intensity.Then, the RFID reader can be converted into the residing flow velocity of label to such fiducial value.With regard to a concrete instance, dispose this RFID reader and be for through use that the reference data that stores will receive from connect or not the difference of the RF signal intensity of the antenna of connection traffic flow monitor be converted into the flow velocity value.
Best situation is, with the antenna of connection traffic flow monitor not as a reference, can be with owing to the variation that coupling caused between label and the reader filters out.In addition, as before mention, the flow velocity pick-up unit is applied to the time length that variation and the label of the resistance value that can make it in the design be placed under the particular flow rate flow velocity and forms relation one to one.For example; The flow velocity pick-up unit is only positioned on an antenna; Can allow like this to change within the specific limits as a kind of function from the signal of RFID label apparatus, and this function just antenna be placed on the function that just has after the time under the certain flow flow velocity.The same, the application of the invention, under the passive condition of RFID label, the RFID reader can detect label apparatus whether be placed under certain flow velocity and this flow velocity whether within the acceptable range.
Do not use the various RFID labels of two antennas also can perceive the variation of flow velocity with the flow velocity pick-up unit, the variation that the variation of perceived flux flow velocity is based on resonant frequency on the antenna also can recognize the variation that antenna receives signal.
For example pass through design to the antenna that links to each other with the flow velocity pick-up unit; The frequency that can make antenna is at ISM (Industrial Scientific Medical; Industry, science, medical science) the interior variation of frequency range, can connect this antenna that links to each other with flow velocity pick-up unit and logical circuit on the label of standard.
For example label antenna can so be set in a concrete instance; Before in being exposed to certain flow flow velocity environment; The resonant frequency of antenna is 902-928MHZ, but in a single day label is exposed in the certain flow flow velocity environment, because the influence of flow velocity; The resonant frequency of antenna is just reduced to 899.5-927.5MHZ; Frequency frequency range (902-928MHZ) at U.S. RFID is split into 52 channels, and reader can be skipped the channel that can not receive at random in these 52 channels, and the benefit of this jump of reader is exactly to prevent effectively that a plurality of readers from attempting the conflict of using same frequency to cause in same physical space.
For example in an example, RFID frequency range (902-928MHZ) is not to be divided into 52 channels but the antenna settings that on average has been divided into n channel tag is carried out work under this frequency range (902-928MHZ).Because label antenna links to each other with the flow velocity pick-up unit, so as long as flow velocity has surpassed the scope of predefined value, the frequency of operation of antenna tag antenna just drops among (899.5-927.5MHZ) this frequency range.Therefore compare just channel n to be got rid of from band limits with original frequency range and go, the frequency range (899.5-927.5MHZ) after therefore changing is carried out exchanging of information with regard to no longer allowing label with channel n.
In concrete instance; If the environment at label place has surpassed the flow velocity scope of expection; Reader can only send instruction to label through channel 1 to n-1; Label also can be made a response because the antenna in the label just can only work in this frequency range, when reader with the frequency of n channel when label sends instruction; So no longer reach the 928MHZ label and just no longer make a response because the variation of label flow velocity has caused the resonant frequency of label antenna to drop to 899.5-927.5MHZ, pass information back reader.
Favourable aspect is just to be reflected by the disappearance of this information interchange owing to variation that flow velocity has exceeded the operating frequency of antenna that predefined value causes.
In model; Reader can send an instruction between channel n-1 and channel n to label and further check that drift has taken place the operating frequency range of label antenna; Because label can receive the instruction that sends through channel n-1; And can be to the reader feedback information through channel n-1; Because label can not receive the instruction that sends through channel n, and can not can so just confirm that drift has taken place the operating frequency range of label antenna to the reader feedback information through channel n.
The variation of flow velocity causes the frequency of operation of label antenna to take place upwards to be not limited in downward drift and present invention frequency range on average is divided into n channel.
The embodiment of the invention can detect flow velocity at lower cost and change, and the energy that utilizes RFID to obtain, and has solved the powerup issue that flow velocity detects.
The enforcement of each characteristics of this system may relate to software; The combination that hardware also possibly relate to software and hardware just can reach, and for example the enforcement of many advantages of system is to realize with the mutual mode that exchanges of computer and other equipment machines with object oriented programming languages with a kind of high-caliber processing through programming.Each such function program for example possibly be stored in the storage intermediary in the ROM (read-only memory) to be read by a computer and processor and realize above-mentioned function.
Those skilled in the art can also recognize the various illustrative components, blocks (illustrativelogical block) that the embodiment of the invention is listed, and unit and step can be passed through electronic hardware, computer software, or both combinations realize.Be the clear replaceability (interchangeability) of showing hardware and software, above-mentioned various illustrative components (illustrativecomponents), unit and step have been described their function generally.Such function is to realize depending on the designing requirement of certain applications and total system through hardware or software.Those skilled in the art can be for every kind of certain applications, and can make ins all sorts of ways realizes described function, but this realization should not be understood that to exceed the scope of embodiment of the invention protection.
Various illustrative logical block described in the embodiment of the invention; Or the unit can pass through general processor, digital signal processor, special IC (ASIC); Field programmable gate array (FPGA) or other programmable logic device; Discrete gate or transistor logic, discrete hardware components, or the design of above-mentioned any combination realizes or operates described function.General processor can be microprocessor, and alternatively, this general processor also can be any traditional processor, controller, microcontroller or state machine.Processor also can realize through the combination of calculation element, for example digital signal processor and microprocessor, a plurality of microprocessors, Digital Signal Processor Core of one or more microprocessors associatings, or any other similarly configuration realize.
The method described in the embodiment of the invention or the step of algorithm can directly embed hardware, the software module of processor execution or the two combination.Software module can be stored in the storage medium of other arbitrary form in RAM storer, flash memory, ROM storer, eprom memory, eeprom memory, register, hard disk, moveable magnetic disc, CD-ROM or this area.Exemplarily, storage medium can be connected with processor, so that processor can read information from storage medium, and can deposit write information to storage medium.Alternatively, storage medium can also be integrated in the processor.Processor and storage medium can be arranged among the ASIC, and ASIC can be arranged in the user terminal.Alternatively, processor and storage medium also can be arranged in the various parts in the user terminal.
In one or more exemplary designs, the described above-mentioned functions of the embodiment of the invention can realize in hardware, software, firmware or this three's combination in any.If in software, realize, these functions can be stored on the media with computer-readable, or are transmitted on the media of computer-readable with one or more instructions or code form.The computer-readable media comprises that the computer storage medium lets computer program transfer to other local telecommunication media from a place with being convenient to make.Storage medium can be the useable medium that any general or special computer can access.For example; Such computer readable media can include but not limited to RAM, ROM, EEPROM, CD-ROM or other optical disc storage, disk storage or other magnetic storage device, or other any can be used to carry or store with instruction or data structure and other can be read the media of the program code of form by general or special computer or general or special processor.In addition; Any connection can suitably be defined as the computer-readable media; For example, if software is through a concentric cable, optical fiber computer, twisted-pair feeder, Digital Subscriber Line (DSL) or also being comprised in the defined computer-readable media with wireless mode transmission such as for example infrared, wireless and microwaves from a web-site, server or other remote resource.Described video disc (disk) and disk (disc) comprise Zip disk, radium-shine dish, CD, DVD, floppy disk and Blu-ray Disc, and disk is usually with the magnetic duplication data, and video disc carries out the optical reproduction data with laser usually.Above-mentioned combination also can be included in the computer-readable media.
Above-described embodiment; The object of the invention, technical scheme and beneficial effect have been carried out further explain, and institute it should be understood that the above is merely embodiment of the present invention; And be not used in qualification protection scope of the present invention; All within spirit of the present invention and principle, any modification of being made, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (14)
1. the RFID label with the flow velocity pick-up unit is characterized in that, two pins are arranged on the chip of said RFID label; Two pins of said flow velocity pick-up unit and this link to each other; And form parallel-connection structure with the antenna of said RFID label; The variation of extraneous flow velocity can cause the changes in resistance of flow velocity pick-up unit own; The logical circuit that a control break-make is arranged on said flow velocity pick-up unit and circuit that the chip of RFID label is connected; The circuit of this connection is the part of chip with the logical circuit of control break-make, the break-make of logical circuit determined the flow velocity pick-up unit whether with the sky line parallel: when logical circuit breaks off, the flow velocity pick-up unit not with the sky line parallel; After being placed on certain following a period of time of flow velocity, first resonant frequency and the signal intensity of antenna remain unchanged this moment; When logical circuit is connected, a flow velocity pick-up unit and a day line parallel, be placed on certain following a period of time of flow velocity this moment after, the characteristic frequency of antenna and signal intensity have one at least and change, antenna is operated under second resonant frequency at this moment; Said RFID label receives the break-make of the instruction of RFID reader transmission with control logic circuit, thereby realizes detecting from the difference between the signal intensity of the different frequency of antenna through comparison the change of flow velocity.
2. according to claim 1 with the RFID label of flow velocity pick-up unit, it is characterized in that the antenna of said RFID label is a monopole antenna.
3. according to claim 1 with the RFID label of flow velocity pick-up unit, it is characterized in that the antenna of said RFID label is a double-doublet antenna: said flow velocity pick-up unit forms parallel-connection structure with antenna wherein; Perhaps said flow velocity pick-up unit and two antennas form parallel-connection structure simultaneously.
4. according to claim 1 with the RFID label of flow velocity pick-up unit; It is characterized in that; Said flow velocity pick-up unit is a resistor-type flow velocity pick-up unit, and said resistor-type flow velocity pick-up unit comprises: heat-conducted flow monitor and other resistor-type flow velocity pick-up units.
5. the RFID label with the flow velocity pick-up unit is characterized in that, a pin is arranged on the chip of said RFID label; One end of said flow velocity pick-up unit links to each other with this pin; The other end is connected on the antenna of said RFID label; And form parallel-connection structure with antenna; The variation of extraneous flow velocity can cause the changes in resistance of flow velocity pick-up unit own, and the logical circuit of a control break-make is arranged on said flow velocity pick-up unit and circuit that the chip of RFID label is connected, and the circuit of this connection and the logical circuit of controlling break-make are the parts of chip; The break-make of logical circuit determined the flow velocity pick-up unit whether with the sky line parallel: when logical circuit breaks off; The flow velocity pick-up unit not with the sky line parallel, this moment be placed on certain following a period of time of flow velocity after, first resonant frequency and the signal intensity of antenna remain unchanged; When logical circuit is connected, a flow velocity pick-up unit and a day line parallel, be placed on certain following a period of time of flow velocity this moment after, the characteristic frequency of antenna and signal intensity have one at least and change, antenna is operated under second resonant frequency at this moment; Said RFID label receives the break-make of the instruction of RFID reader transmission with control logic circuit, thereby realizes detecting from the difference between the signal intensity of the different frequency of antenna through comparison the change of flow velocity.
6. like the RFID label of the said band flow velocity of claim 5 pick-up unit, it is characterized in that the antenna of said RFID label is a monopole antenna.
7. like the RFID label of the said band flow velocity of claim 5 pick-up unit, it is characterized in that the antenna of said RFID label is a double-doublet antenna: said flow velocity pick-up unit forms parallel-connection structure with antenna wherein; Perhaps said flow velocity pick-up unit and two antennas form parallel-connection structure simultaneously.
8. like the RFID label of the said band flow velocity of claim 5 pick-up unit; It is characterized in that; Said flow velocity pick-up unit is a resistor-type flow velocity pick-up unit, and said resistor-type flow velocity pick-up unit comprises: heat-conducted flow monitor and other resistor-type flow velocity pick-up units.
9. RFID label with the flow velocity pick-up unit; It is characterized in that; Said flow velocity pick-up unit is connected on the antenna of said RFID label, and forms parallel-connection structure with antenna, and the variation of extraneous flow velocity can cause the changes in resistance of flow velocity pick-up unit own; The logical circuit that a control break-make is arranged on said flow velocity pick-up unit and circuit that antenna is connected; The circuit of this connection is the part of chip with the logical circuit of control break-make, the break-make of logical circuit determined the flow velocity pick-up unit whether with the sky line parallel: when logical circuit breaks off, the flow velocity pick-up unit not with the sky line parallel; After being placed on certain following a period of time of flow velocity, first resonant frequency and the signal intensity of antenna remain unchanged this moment; When logical circuit is connected, a flow velocity pick-up unit and a day line parallel, be placed on certain following a period of time of flow velocity this moment after, the characteristic frequency of antenna and signal intensity have one at least and change, antenna is operated under second resonant frequency at this moment; Said RFID label receives the break-make of the instruction of RFID reader transmission with control logic circuit, thereby realizes detecting from the difference between the signal intensity of the different frequency of antenna through comparison the change of flow velocity.
10. like the RFID label of the said band flow velocity of claim 9 pick-up unit, it is characterized in that the antenna of said RFID label is a monopole antenna.
11. the RFID label like the said band flow velocity of claim 9 pick-up unit is characterized in that, the antenna of said RFID label is a double-doublet antenna: said flow velocity pick-up unit forms parallel-connection structure with antenna wherein; Perhaps said flow velocity pick-up unit and two antennas form parallel-connection structure simultaneously.
12. RFID label like the said band flow velocity of claim 9 pick-up unit; It is characterized in that; Said flow velocity pick-up unit is a resistor-type flow velocity pick-up unit, and said resistor-type flow velocity pick-up unit comprises: heat-conducted flow monitor and other resistor-type flow velocity pick-up units.
13. the rfid system with the flow velocity pick-up unit, said rfid system comprises RFID label and RFID reader, it is characterized in that,
Said RFID label comprises the RFID label of each said band flow velocity pick-up unit among the claim 1-4; Or the RFID label of each said band flow velocity pick-up unit among the claim 5-8, or the RFID label of each said band flow velocity pick-up unit among the claim 9-12;
Said RFID reader sends the break-make of instruction with the logical circuit of control RFID label, thereby detects the change of flow velocity from the difference between the signal intensity of the different frequency of antenna through comparison.
14. the flow velocity detection method with the rfid system of flow velocity pick-up unit is characterized in that, said flow velocity detection method is applied to the rfid system of the said band flow velocity of claim 13 pick-up unit, comprising:
Send the break-make of instruction through said RFID reader with the logical circuit of control RFID label;
Receive the break-make of the instruction of RFID reader transmission through the RFID label: when logical circuit breaks off with control logic circuit; The flow velocity pick-up unit not with the sky line parallel; After being placed on certain following a period of time of flow velocity, first resonant frequency and the signal intensity of antenna remain unchanged this moment; When logical circuit is connected, a flow velocity pick-up unit and a day line parallel, be placed on certain following a period of time of flow velocity this moment after, the characteristic frequency of antenna and signal intensity have one at least and change, antenna is operated under second resonant frequency at this moment;
Utilize the comparison of said RFID reader to detect the change of flow velocity from the difference between the signal intensity of the different frequency of antenna.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101836632A CN102750579A (en) | 2012-06-01 | 2012-06-01 | RFID (Radio Frequency Identification Devices) label with flow and flow velocity detector, RFID system and flow and flow velocity detection method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101836632A CN102750579A (en) | 2012-06-01 | 2012-06-01 | RFID (Radio Frequency Identification Devices) label with flow and flow velocity detector, RFID system and flow and flow velocity detection method |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1965324A (en) * | 2004-04-08 | 2007-05-16 | 3M创新有限公司 | Variable frequency radio frequency identification (RFID) tags |
| WO2007130482B1 (en) * | 2006-05-04 | 2008-10-09 | Goliath Solutions Llc | Distributed rfid antenna array utilizing circular polarized helical antennas |
| CN101383020A (en) * | 2008-10-14 | 2009-03-11 | 厦门大学 | Environment sensitive type passive electronic label |
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2012
- 2012-06-01 CN CN2012101836632A patent/CN102750579A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1965324A (en) * | 2004-04-08 | 2007-05-16 | 3M创新有限公司 | Variable frequency radio frequency identification (RFID) tags |
| WO2007130482B1 (en) * | 2006-05-04 | 2008-10-09 | Goliath Solutions Llc | Distributed rfid antenna array utilizing circular polarized helical antennas |
| CN101383020A (en) * | 2008-10-14 | 2009-03-11 | 厦门大学 | Environment sensitive type passive electronic label |
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Application publication date: 20121024 |