CN106919877A - A kind of super high frequency radio frequency recognition read-write machine and method - Google Patents
A kind of super high frequency radio frequency recognition read-write machine and method Download PDFInfo
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- CN106919877A CN106919877A CN201510995616.1A CN201510995616A CN106919877A CN 106919877 A CN106919877 A CN 106919877A CN 201510995616 A CN201510995616 A CN 201510995616A CN 106919877 A CN106919877 A CN 106919877A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
- G06K7/10198—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves setting parameters for the interrogator, e.g. programming parameters and operating modes
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Abstract
The present invention provides a kind of super high frequency radio frequency recognition read-write machine and method, including：Control module；Transmitter module；Directional couple module；Radio-frequency match module；Anneta module；Vector Modulation carrier wave cancellation module；Receiver module；Interface module；Power module.On the one hand the isolation for increasing coupling module by matching reduces the carrier signal power that transmitter module is leaked into receives link；On the other hand the carrier signal power in receives link is leaked into by the reduction of Vector Modulation carrier wave cancellation technology.The present invention changes the impedance operator of coupler using radio-frequency match technology, increases isolation, and reduction leaks into the carrier signal power in receives link from transmitter module；The carrier signal power in receives link is leaked into using the reduction of Vector Modulation carrier wave cancellation technology；By two kinds of combinations of technology, would leak into the carrier power in receives link and eliminate or be reduced to sufficiently small, the signal that Hold sticker is returned, so as to lift the sensitivity of read write line, increase reading/writing distance.
Description
Technical field
The present invention relates to radio frequency arts, more particularly to a kind of super high frequency radio frequency recognition read-write machine and method.
Background technology
Radio frequency identification (Radio Frequency Identification, RFID) is a kind of wireless communication technology, is believed using radio frequency
Number Space Coupling is realized recognizing target and obtains a kind of non-contact automatic identification technology of target data.RFID technique is most important
Advantage be contactless identification, and with the severe ring that the bar codes such as snow, mist, ice, coating, dust and dirt cannot be used can be penetrated
Border label reading, additionally it is possible to which, while recognizing multiple labels, label has volume miniaturization, various shapes, antipollution energy in itself
The advantages of power is strong, reusable, data memory capacitys big and can encrypt.With the development of RFID technique, its application
Field is increasingly extensive, such as food security trace to the source, books system for borrowing and returning, gate control system, warehousing management, managing system of car parking,
Traffic monitoring management etc. various fields.Zeng You expert points out that RFID technique is likely to become after mobile communication technology and internet
Another item influence global economy and the new technology lived after technology.
RFID is divided into according to the difference for obtaining energy source mode：Active, passive, semi-active three kinds of electricity such as semi-passive
Subtab.Also known as active tag, the working power of label is supplied active electronic label by internal cell completely, while electronic tag
It is also to be provided by battery with the RF energy needed for reader communication；Label read/write distance farther out, overall dimensions are larger, thicker,
Heavier, high cost, application field is limited, and battery can not be used for a long time, needs to change battery after depleted of energy.Semi-active electronics
Label also known as semi-active type label, power by circuit of the battery only to maintaining data in label；Before label does not enter people's working condition, one
Directly in a dormant state, equivalent to passive label；When label enters the reading region of reader, by penetrating that reader sends
Frequency signal is encouraged, and enters people's working condition；The advantage and disadvantage of label are essentially the same with active label.Passive electronic label is also known as passive type
Label, does not have internal battery, and label converts electricity of the part energy for needed for its work from the RF energy that reader sends
Source；Label has external form compact, gently, thin, easy for installation, and cost is very low and with service life very long, is applicable various making
With occasion, can accomplish non-maintaining.(international standard ISO18000-6C defines the work of 860-960MHz to other ultrahigh frequency RFID
Make frequency range) it is shorter relative to high frequency 13.56MHz and its its operation wavelength of low frequency 125KHz, antenna size is compact and flexible, should
With flexible, therefore the passive label and read write line of hyperfrequency turn into the emphasis direction of Internet of Things field development in recent years.
Because passive RFID tags are that the radiofrequency signal launched by read write line is powered and sends out storage information in the chips, this
It is accomplished by radio-frequency transmissions link and is constantly in working condition, the isolation and antenna standing wave of termination power is influenceed by practical devices
So that during portion of carriers signal power leaks into receives link, and the signal frequency that label scattering is returned is non-with frequency of carrier signal
Very close to carrier leak crosses conference causes the saturation of receiver, influences noise and the sensitivity of receives link, and then influences read write line
The effect and distance of read write tag.Super high frequency radio frequency recognition read-write machine 1 is built using separating component scheme in the market,
As shown in figure 1, including control module 11, transmitter module 12, coupling module 13, Anneta module 14, receiver module 15, connecing
Mouth mold block 16 and power module 17；Transmitter module 12 can not enough leak a carrier power because of the isolation of coupling module 13
To in receives link, additionally, it is not that 50 ohm of standard can also reflect a part of load that Anneta module 14 is influenceed by practical devices
Ripple signal power in receives link, receiver module 15 by overlaying influence of both this can saturation enter inelastic region, or even damage
Bad device, influences noise and the sensitivity of receives link, is mainly used in some small-powers closely field.
Therefore a high performance ultrahigh frequency reader-writer is developed, reduce or stop a leak the carrier signal work(in receives link
Rate, it is ensured that receiving the normal work of link has turned into one of those skilled in the art's problem demanding prompt solution.
The content of the invention
The shortcoming of prior art in view of the above, it is an object of the invention to provide a kind of super high frequency radio frequency recognition read-write machine and side
Method, for solving to leak into the prior art the noise of the excessive influence receives link of carrier signal power in receives link and sensitive
The problem of degree.
In order to achieve the above objects and other related objects, the present invention provides a kind of super high frequency radio frequency recognition read-write machine, the hyperfrequency
Radio-frequency identification reader/writer at least includes：
Control module, transmitter module, directional couple module, radio-frequency match module, Anneta module, Vector Modulation carrier wave cancellation mould
Block, receiver module, interface module and power module；
The control module is used to process the signal received and dispatched, and produces the control for controlling the Vector Modulation carrier wave cancellation module
Signal processed；
The transmitter module is connected with the control module, for producing and send write-in label rf modulated signal；
The directional couple module connects with the transmitter module, the radio-frequency match module and the Vector Modulation carrier wave cancellation module
Connect, for the rf modulated signal for writing label to be conducted to the radio-frequency match module, or the signal that label is returned is coupled to
The Vector Modulation carrier wave cancellation module；
The radio-frequency match module is connected with the directional couple module, the isolation for adjusting the directional couple module；
The Anneta module is connected with the radio-frequency match module, for the rf modulated signal by label is write with free space
Electromagnetic wave form conduct to label and receive from label return signal；
The Vector Modulation carrier wave cancellation module is connected with the directional couple module, the control module and the receiver module,
Carrier signal power in receives link is leaked into for reducing, and the signal transmission that label is returned is to the receiver module；
The receiver module is connected between the Vector Modulation carrier wave cancellation module and the control module, is received the vector and is adjusted
The output signal of carrier wave cancellation module processed, is mixed to intermediate frequency, and the control module is transferred to after enhanced processing；
The interface module is used for the transmission of data；
The power module is used to be powered to the super high frequency radio frequency recognition read-write machine.
Preferably, the radio-frequency match module includes one group of L-type matching network.
Preferably, the I of the Vector Modulation carrier wave cancellation module and the control module2C interface is connected, and the control is obtained with this
Signal processed.
Preferably, the Vector Modulation carrier wave cancellation module includes：
First detector, radio frequency vector modulator and combiner；
First detector is connected with the directional couple module, for detecting the carrier signal power leaked into receives link
Value, and testing result is sent to the control module, the control signal is produced with this；
The radio frequency vector modulator is connected with the control module and the directional couple module, is produced according to the control signal
, radiofrequency signal of opposite in phase equal with the carrier-signal amplitude leaked into receives link；
The combiner is connected with the radio frequency vector modulator and the directional couple module, by the radiofrequency signal with leak into
Carrier signal combining in receives link, to reduce the carrier signal power in receives link, and the signal that Hold sticker is returned.
It is highly preferred that the radio frequency vector modulator includes four-way D/A converting circuit and Vector Modulation circuit；The four-way
Road D/A converting circuit receives the control signal, and is converted to two groups of analog difference signals；The Vector Modulation circuit with it is described
Four-way D/A converting circuit and the directional couple module are connected, according to two groups of differences that the four-way D/A converting circuit is exported
Sub-signal is while the amplitude and phase of controlled output signal, produce the radiofrequency signal.
It is highly preferred that the Vector Modulation carrier wave cancellation module also includes the low-noise amplifier being connected with the combiner, it is used for
Amplify the signal that label is returned.
It is highly preferred that the Vector Modulation carrier wave cancellation module also includes the second detector, it is connected with the low-noise amplifier,
RF signal power for detecting the low-noise amplifier output, and by testing result output to the control module, to adjust
The whole control signal.
Preferably, the transmitter module includes：The voltage controlled oscillator that is connected with the control module and connect with the voltage controlled oscillator
The power amplifier for connecing.
It is highly preferred that the receiver module includes：It is connected with the Vector Modulation carrier wave cancellation module and the voltage controlled oscillator
Frequency mixer and the frequency mixer intermediate-frequency filter for connecting and the intermediate frequency amplifier being connected with the intermediate-frequency filter.
In order to achieve the above objects and other related objects, the present invention provides a kind of super high frequency radio frequency identification reading/writing method, the superelevation
Frequency radio frequency identification read-write method at least includes：
Transmission state：The rf modulated signal of write-in label is produced, and the rf modulated signal of label will be write with free space
The form of electromagnetic wave conduct to label；
Reception state：Anneta module receives the signal returned from label, on the one hand by adjusting the impedance operator of coupling module, carries
High-isolation, reduces the carrier signal power that transmitter module is leaked into receives link, on the other hand by Vector Modulation carrier wave phase
The technology that disappears reduction leaks into the carrier signal power in receives link, and the signal that label is returned retains.
Preferably, using the insertion loss and isolation of coupling module as the foundation of adjustment.
Preferably, the specific method for reducing the carrier signal power leaked into receives link includes：
Detection leaks into the carrier signal power value in receives link, and produces a control signal according to the value for detecting；
According to the control signal and generation radio frequency letter equal with the carrier-signal amplitude leaked into receives link, opposite in phase
Number；
The radiofrequency signal is combined with the carrier signal leaked into receives link, with reducing and leaking into receives link
The signal that carrier signal power, Hold sticker are returned.
It is highly preferred that produce the specific method of the radiofrequency signal including：
The control signal is converted into two groups of differential signals of I, Q, and gathers the carrier signal power value in receives link, passed through
Two groups of differential signals of I, Q simultaneously controlled output signal amplitude and phase, to produce the radiofrequency signal.
It is highly preferred that the control accuracy of amplitude reaches 0.5dBm, the control accuracy of phase reaches 2 °.
It is highly preferred that the interval of the control signal is quickly found out by dichotomy, to determine the amplitude of the radiofrequency signal rapidly
With the best region of phase.
Preferably, after being additionally included in the carrier signal for reducing and leaking into receives link, the RF signal power value that detection is received,
Carrier signal in thinking to leak into receives link if detected value is less than setting value has eliminated sufficiently small, does not influence to receive
Link normal work；The control signal is adjusted if detected value is more than setting value, further reduction is leaked into receives link
Carrier signal power.
As described above, super high frequency radio frequency recognition read-write machine of the invention and method, have the advantages that：
1st, super high frequency radio frequency recognition read-write machine of the invention and method increase radio-frequency match between directional couple module and Anneta module
Module, the impedance operator of coupler is changed using radio-frequency match technology, increases isolation, and reduction leaks into reception from transmitter module
Carrier signal power in link, and primary path power is had little to no effect.
2nd, super high frequency radio frequency recognition read-write machine of the invention and method increase Vector Modulation between directional couple module and receiver module
Carrier wave cancellation module, the carrier signal power in receives link is leaked into using the reduction of Vector Modulation carrier wave cancellation technology.
3rd, super high frequency radio frequency recognition read-write machine of the invention and method mutually tie radio-frequency match technology with Vector Modulation carrier wave cancellation technology
Close, would leak into carrier power in receives link eliminate or be reduced to it is sufficiently small, so as to lift the receiving sensitivity of read write line,
Serve the effect for improving read write line distance.
Brief description of the drawings
Fig. 1 is shown as the schematic diagram of super high frequency radio frequency recognition read-write machine of the prior art.
Fig. 2 is shown as the schematic diagram of super high frequency radio frequency recognition read-write machine of the invention.
Fig. 3 is shown as an embodiment schematic diagram of super high frequency radio frequency recognition read-write machine of the invention.
Component label instructions
1 super high frequency radio frequency recognition read-write machine
11 control modules
12 transmitter modules
13 coupling modules
14 Anneta modules
15 receiver modules
16 interface modules
17 power modules
2 super high frequency radio frequency recognition read-write machines
21 control modules
211~212 the first~the second analog-digital converters
22 transmitter modules
221 voltage controlled oscillators
222 power amplifiers
23 directional couple modules
24 radio-frequency match modules
25 Anneta modules
251 single pole multiple throws
252 antennas
26 Vector Modulation carrier wave cancellation modules
261 first detectors
262 radio frequency vector modulators
2621 four-way D/A converting circuits
2622 filter circuits
2623 Vector Modulation circuits
263 combiners
264 low-noise amplifiers
265 second detectors
27 receiver modules
271 frequency mixers
272 intermediate-frequency filters
273 intermediate frequency amplifiers
28 interface modules
29 power modules
Specific embodiment
Embodiments of the present invention are illustrated below by way of specific instantiation, those skilled in the art can be as disclosed by this specification
Content understand other advantages of the invention and effect easily.The present invention can also add by way of a different and different embodiment
To implement or apply, the various details in this specification can also be based on different viewpoints and application, without departing from essence of the invention
Various modifications or alterations are carried out under god.
Refer to Fig. 2~Fig. 3.It should be noted that the diagram provided in the present embodiment only illustrates of the invention in a schematic way
Basic conception, component count, shape when only display is with relevant component in the present invention rather than according to actual implementation in schema then and
Size is drawn, and it is actual when the implementing kenel of each component, quantity and ratio can be a kind of random change, and its assembly layout type
State is likely to increasingly complex.
As shown in Figure 2 to 3, the present invention provides a kind of super high frequency radio frequency recognition read-write machine 2, the super high frequency radio frequency identification read-write
Device 2 at least includes：
Control module 21, transmitter module 22, directional couple module 23, radio-frequency match module 24, Anneta module 25, vector are adjusted
Carrier wave cancellation module 26, receiver module 27 processed, interface module 28 and power module 29.
As shown in Fig. 2 the control module 21 is used to process the signal received and dispatched, and the control Vector Modulation is produced to carry
The control signal of ripple cancellation module 26.
Specifically, as shown in figure 3, the control module 21 and the transmitter module 22, the receiver module 27 and the arrow
Amount modulation carrier wave cancellation module 26 is connected, for the ASK modulation control signals to the output write-in label of the transmitter module 22；
Data signal and storage and the identification that label is returned are received from the receiver module 27；From the Vector Modulation carrier wave cancellation module
The control signal of the Vector Modulation carrier wave cancellation module 26 is exported after 26 reception detection signals.The control module 21 also includes
First analog-digital converter 211 and the second analog-digital converter 212, for the detection signal of simulation to be converted into data signal.
As shown in Fig. 2 the transmitter module 22 is connected with the control module 21, for producing and penetrating for write-in label is sent
Frequency modulation.
Specifically, as shown in figure 3, the transmitter module 22 includes：Voltage controlled oscillator 221 and power amplifier 222.It is described
Voltage controlled oscillator 221 is connected with the control module 21, the digital controlled signal that the control module 21 is exported is converted into and is penetrated
Frequency signal is simultaneously exported to the power amplifier 222 and carries out power amplification.
As shown in Fig. 2 the directional couple module 23 and the transmitter module 22, the radio-frequency match module 24 and the arrow
Amount modulation carrier wave cancellation module 26 is connected, for the rf modulated signal for writing label to be conducted to the radio-frequency match module 24,
Or the signal for returning to label is coupled to the Vector Modulation carrier wave cancellation module 26.
Specifically, as shown in figure 3, the directional couple module 23 is four port devices, the super high frequency radio frequency is recognized and is read and write
The carrier signal that device sends plays certain buffer action with receives link.
As shown in Fig. 2 the radio-frequency match module 24 is connected with the directional couple module 23, for adjusting the orientation coupling
The isolation of matched moulds block 23.
Specifically, as shown in figure 3, the radio-frequency match module 24 is connected to the output end of the directional couple module 23, bag
One group of L-type matching network (not shown) is included, the impedance operator according to the directional couple module 23 adjusts the orientation coupling
The isolation of matched moulds block 23, reduce from the transmitter module 22 leak into receives link in carrier signal power, and to main logical
Road power has little to no effect.
As shown in Fig. 2 the Anneta module 25 is connected with the radio-frequency match module 24, the radio frequency for will write label is adjusted
Signal processed is conducted to label by the form of electromagnetic wave and receives the signal returned from label.
Specifically, as shown in figure 3, the Anneta module 25 includes single pole multiple throw 251 and antenna 252, by the list
The switching of knife multithrow switch 251 changes the path being connected with the antenna 252, realizes that multichannel antenna switching covering is different with this
Direction.The antenna 252 mutually converts the guided wave for transmitting above-the-line promotion with the electromagnetic wave signal of free space, to realize
Radio communication.
As shown in Fig. 2 the Vector Modulation carrier wave cancellation module 26 and the directional couple module 23, the control module 21
And the receiver module 27 is connected, for reducing the carrier signal power leaked into receives link, and the signal that label is returned
It is delivered to the receiver module 27.In the present embodiment, the Vector Modulation carrier wave cancellation module 26 and the control module 21
I2C interface is connected.
Specifically, as shown in figure 3, the Vector Modulation carrier wave cancellation module 26 includes：First detector 261, radio frequency vector
Modulator 262, combiner 263, the detector 265 of low-noise amplifier 264 and second.
First detector 261 is connected with the directional couple module 23, detects from the Anneta module 25 and the orientation
The signal of the transmission of coupling module 23, signal in receives link includes the useful signal that label returns, from the transmitter module 22
Leak into the carrier signal in receives link and from the Anneta module 25 be reflected back receives link in carrier signal, latter two
Signal can be disturbed the useful signal that label is returned, and increases the noise in receives link, is reduced and is received sensitive.Described first
The carrier signal power value that detector 261 pairs is leaked into receives link is detected, and testing result is passed through into first mould
Number converter 211 is sent to the control module 21, and the control signal is produced with this.
The radio frequency vector modulator 262 is connected with the control module 21 and the directional couple module 23, according to the control
Signal processed produces a, radiofrequency signal of opposite in phase equal with the carrier-signal amplitude leaked into receives link.
More specifically, as shown in figure 3, the radio frequency vector modulator 262 includes four-way D/A converting circuit 2621, filtering
Circuit 2622 and Vector Modulation circuit 2623.The four-way D/A converting circuit 2621 receives the control signal, and turns
Two groups of analog difference signals are changed to, in the present embodiment, two groups of analog difference signals are two groups of differential signals of I, Q, are respectively used to
Amplitude modulation and phase modulation.The filter circuit 2622 is connected with the four-way D/A converting circuit 2621, for filtering clutter.Institute
State Vector Modulation circuit 2623 to be connected with the filter circuit 2622 and the directional couple module 23, with two groups of difference of I, Q
Signal controls the amplitude and phase of the output signal of Vector Modulation circuit 2623 simultaneously, produces and leak into the load in receives link
Ripple signal amplitude is equal, opposite in phase radiofrequency signal.
The combiner 263 is connected with the radio frequency vector modulator 262 and the directional couple module 23, by radio frequency letter
Number with the carrier signal combining leaked into receives link, to reduce the carrier signal power in receives link, and Hold sticker is returned
The signal for returning.
The low-noise amplifier 264 is connected with the combiner 263, and treatment is amplified to the signal that label is returned.
Second detector 265 is connected with the low-noise amplifier 264, defeated for detecting the low-noise amplifier 264
The RF signal power for going out, and testing result is exported into the control module 21 by second analog-digital converter 212, with
Adjust the control signal.
As shown in Fig. 2 the receiver module 27 is connected to the Vector Modulation carrier wave cancellation module 26 and the control module 21
Between, the output signal of the Vector Modulation carrier wave cancellation module 26 is received, and be transferred to the control module 21.
Specifically, as shown in figure 3, the receiver module 27 includes：Frequency mixer 271, intermediate-frequency filter 272 and intermediate frequency are put
Big device 273.The frequency mixer 271 is connected with the Vector Modulation carrier wave cancellation module 26 and the voltage controlled oscillator 221, will
The radiofrequency signal of the output of Vector Modulation carrier wave cancellation module 26 is converted into intermediate-freuqncy signal.The intermediate-frequency filter 272 with it is described
Frequency mixer 271 is connected, for filtering.The intermediate frequency amplifier 273 is connected with the intermediate-frequency filter 272, mixed for amplifying
The intermediate-freuqncy signal that frequency gets off.
As shown in Figure 2 to 3, the super high frequency radio frequency recognition read-write machine also includes interface module 28 and power module 29, described
Interface module 28 is used for data transfer, and the power module 29 is used to be powered to the super high frequency radio frequency recognition read-write machine 2.
As shown in Figure 2 to 3, the present invention also provides a kind of super high frequency radio frequency identification reading/writing method, in the present embodiment, using institute
The realization of super high frequency radio frequency read write line is stated, the super high frequency radio frequency identification reading/writing method at least includes：
Transmission state：The rf modulated signal of write-in label is produced, and the rf modulated signal of label will be write with free space
The form of electromagnetic wave conduct to label.
Specifically, as shown in Figure 2 to 3, the control module 21 will write the signal of label with the output of digital signal form,
It is loaded into carrier signal by the transmitter module 22 and is exported in radiofrequency signal mode, is passed by the directional couple module 23
It is defeated to the radio-frequency match module 24, it is defeated in the transmitter module 22 because the isolation of the directional couple module 23 is limited
The carrier signal for going out is understood during some leaks into receives link, and the radio-frequency match module 24 is according to the directional couple module
23 impedance operator adjusts the isolation of the directional couple module 23, and reduction leaks into receives link from the transmitter module 22
In carrier signal power, writing the electromagnetic wave that the signal of label is converted into free space by the Anneta module 25 is carried out
It is wirelessly transferred, because the Anneta module 25 is influenceed not being matched to 50 ohm of standard by practical devices and machining accuracy, because
This can reflect portion of carriers signal in receives link.
Reception state：Anneta module receives the signal returned from label, on the one hand by adjusting the impedance operator of coupling module, carries
Isolation, reduces the carrier signal power that transmitter module is leaked into receives link, on the other hand by Vector Modulation carrier wave cancellation
Technology reduction leaks into the carrier signal power in receives link, and the signal that label is returned retains.
Specifically, as shown in Figure 2 to 3, the signal that label is returned is received by the Anneta module 25, now reception chain
Road include the signal that label returns, from the transmitter module 22 leak into receives link in carrier signal and from the antenna
Module 25 is reflected back the carrier signal in receives link, first detector, 261 pairs of carrier signals leaked into receives link
Performance number is detected, and testing result is sent into the control module 21 by first analog-digital converter 211, with this
Produce the control signal.
The four-way D/A converting circuit 2621 receives the control signal, and is converted to two groups of differential signals of I, Q, passes through
The filtering clutter of the filter circuit 2622.The Vector Modulation circuit 2623 accept filter after two groups of differential signals of I, Q, with
Two groups of differential signals of I, Q control the amplitude and phase of the output signal of Vector Modulation circuit 2623 simultaneously, produce and leak into
Carrier-signal amplitude in receives link is equal, opposite in phase radiofrequency signal.In the present embodiment, the control module 21 is adopted
The interval of the control signal is quickly found out with dichotomy, to determine the best region of the modulated signal amplitude and phase rapidly,
Greatly improve the speed of service.
By the signal in the radiofrequency signal and receives link, (including the signal and leaking into that label is returned connects the combiner 263
Receive the carrier signal in link) combining, the carrier signal power leaked into receives link is offset with this, what Hold sticker was returned
Signal, then the signal for returning to label by the low-noise amplifier 264 amplifies output to the receiver module 27.
Second detector 265 is detected to the RF signal power value after cancellation, thought if detected value is less than setting value
Leak into the carrier signal in receives link and eliminated sufficiently small, receives link normal work is not influenceed；If detected value is big
The control signal is then adjusted in setting value, the carrier signal power leaked into receives link is further reduced.Due to power with
Voltage has conversion relation, in the present embodiment, using the low-noise amplifier 264 output detection voltage value as basis for estimation,
When detection voltage value is less than 0.7V, it is believed that the carrier signal power leaked into receives link is sufficiently small, will not make reception
Device in link enters saturation region, will not damage device, do not interfere with noise and the sensitivity of receives link yet；Work as magnitude of voltage
During more than 0.7V, it is believed that the carrier signal power leaked into receives link is still very big, still can be to the noise of receives link and spirit
Sensitivity produces influence, accordingly, it would be desirable to adjust the control signal, the carrier signal in receives link is leaked into further reduction
Power.The numerical value of the setting value or voltage does according to design parameters such as signal, the devices of the super high frequency radio frequency recognition read-write machine
Specific setting, is not limited with the present embodiment.
As described above, super high frequency radio frequency recognition read-write machine of the invention and method, have the advantages that：
1st, super high frequency radio frequency recognition read-write machine of the invention and method increase radio-frequency match between directional couple module and Anneta module
Module, the impedance operator of coupler is changed using radio-frequency match technology, increases isolation, and reduction leaks into reception from transmitter module
Carrier signal power in link, and primary path power is had little to no effect.
2nd, super high frequency radio frequency recognition read-write machine of the invention and method increase Vector Modulation between directional couple module and receiver module
Carrier wave cancellation module, the carrier signal power in receives link is leaked into using the reduction of Vector Modulation carrier wave cancellation technology.
3rd, super high frequency radio frequency recognition read-write machine of the invention and method mutually tie radio-frequency match technology with Vector Modulation carrier wave cancellation technology
Close, would leak into carrier power in receives link eliminate or be reduced to it is sufficiently small, so as to lift the receiving sensitivity of read write line,
Serve the effect for improving read write line distance.
In sum, the present invention provides a kind of super high frequency radio frequency recognition read-write machine and method, including：Control module；Send write-in
The transmitter module of label signal；Directional couple module；Adjust the radio-frequency match module of directional couple module impedance operator；Antenna mould
Block；Vector Modulation carrier wave cancellation module for reducing the carrier signal power leaked into receives link；Receive label and return to letter
Number receiver module.Transmission state：The rf modulated signal of write-in label is produced, and the rf modulated signal of label will be write and passed
Next stage is directed at, the impedance operator of coupling module is adjusted, isolation is improved, reduction leaks into the carrier signal work(in receives link
Rate, then signal conducted into label in the form of the electromagnetic wave in free space；Reception state：Anneta module is received from label
The signal of return, on the one hand by adjusting the impedance operator of coupling module, improves isolation, reduces transmitter module and leaks into reception
Carrier signal power in link, on the other hand leaks into the carrier wave in receives link by the reduction of Vector Modulation carrier wave cancellation technology
Signal power, the signal that label is returned retains.Super high frequency radio frequency recognition read-write machine of the invention and method are in directional couple module
Increase radio-frequency match module and Anneta module between, the impedance operator of coupler changed using radio-frequency match technology, increase isolation,
Reduction leaks into the carrier signal power in receives link from transmitter module, and primary path power is had little to no effect；In orientation
Increase Vector Modulation carrier wave cancellation module between coupling module and receiver module, leaked using the reduction of Vector Modulation carrier wave cancellation technology
Carrier signal power in receives link；Radio-frequency match technology and Vector Modulation carrier wave cancellation technology are combined, be would leak into
Carrier power in receives link is eliminated or is reduced to sufficiently small.So, the present invention effectively overcomes of the prior art a variety of
Shortcoming and have high industrial utilization.
The above-described embodiments merely illustrate the principles and effects of the present invention, not for the limitation present invention.It is any to be familiar with this skill
The personage of art all can carry out modifications and changes under without prejudice to spirit and scope of the invention to above-described embodiment.Therefore, such as
Those of ordinary skill in the art completed under without departing from disclosed spirit and technological thought all etc.
Effect modifications and changes, should be covered by claim of the invention.
Claims (16)
1. a kind of super high frequency radio frequency recognition read-write machine, it is characterised in that the super high frequency radio frequency recognition read-write machine at least includes：
Control module, transmitter module, directional couple module, radio-frequency match module, Anneta module, Vector Modulation carrier wave cancellation
Module, receiver module, interface module and power module；
The control module is used to process the signal received and dispatched, and produces the control Vector Modulation carrier wave cancellation module
Control signal；
The transmitter module is connected with the control module, for producing and send write-in label rf modulated signal；
The directional couple module and the transmitter module, the radio-frequency match module and the Vector Modulation carrier wave cancellation module
Connection, for the rf modulated signal for writing label to be conducted to the radio-frequency match module, or the signal coupling that label is returned
It is bonded to the Vector Modulation carrier wave cancellation module；
The radio-frequency match module is connected with the directional couple module, the isolation for adjusting the directional couple module；
The Anneta module is connected with the radio-frequency match module, for the rf modulated signal by label is write with free space
In electromagnetic wave form conduct to label and receive from label return signal；
The Vector Modulation carrier wave cancellation module connects with the directional couple module, the control module and the receiver module
Connect, carrier signal power in receives link is leaked into for reducing, and the signal transmission that label is returned is to the reception mould
Block；
The receiver module is connected between the Vector Modulation carrier wave cancellation module and the control module, receives the vector
The output signal of carrier wave cancellation module is modulated, intermediate frequency is mixed to, the control module is transferred to after enhanced processing；
The interface module is used for the transmission of data；
The power module is used to be powered to the super high frequency radio frequency recognition read-write machine.
2. super high frequency radio frequency recognition read-write machine according to claim 1, it is characterised in that：The radio-frequency match module includes one group
L-type matching network.
3. super high frequency radio frequency recognition read-write machine according to claim 1, it is characterised in that：The Vector Modulation carrier wave cancellation module
With the I of the control module2C interface is connected, and the control signal is obtained with this.
4. super high frequency radio frequency recognition read-write machine according to claim 1, it is characterised in that：The Vector Modulation carrier wave cancellation module
Including：
First detector, radio frequency vector modulator and combiner；
First detector is connected with the directional couple module, for detecting the carrier signal work(leaked into receives link
Rate value, and testing result is sent to the control module, the control signal is produced with this；
The radio frequency vector modulator is connected with the control module and the directional couple module, is produced according to the control signal
Raw, radiofrequency signal of opposite in phase equal with the carrier-signal amplitude leaked into receives link；
The combiner is connected with the radio frequency vector modulator and the directional couple module, by the radiofrequency signal and leakage
Carrier signal combining in receives link, to reduce the carrier signal power in receives link, and the letter that Hold sticker is returned
Number.
5. super high frequency radio frequency recognition read-write machine according to claim 4, it is characterised in that：The radio frequency vector modulator includes four
Passage D/A converting circuit and Vector Modulation circuit；The four-way D/A converting circuit receives the control signal, and turns
It is changed to two groups of analog difference signals；The Vector Modulation circuit and the four-way D/A converting circuit and the directional couple mould
Block is connected, and the two groups of differential signals exported according to the four-way D/A converting circuit are while the amplitude and phase of controlled output signal
Position, produces the radiofrequency signal.
6. super high frequency radio frequency recognition read-write machine according to claim 4, it is characterised in that：The Vector Modulation carrier wave cancellation module
Also include the low-noise amplifier being connected with the combiner, the signal for amplifying label return.
7. super high frequency radio frequency recognition read-write machine according to claim 6, it is characterised in that：The Vector Modulation carrier wave cancellation module
Also include the second detector, be connected with the low-noise amplifier, the radio frequency letter for detecting the low-noise amplifier output
Number power, and by testing result output to the control module, to adjust the control signal.
8. super high frequency radio frequency recognition read-write machine according to claim 1, it is characterised in that：The transmitter module includes：With it is described
The voltage controlled oscillator of control module connection and the power amplifier being connected with the voltage controlled oscillator.
9. super high frequency radio frequency recognition read-write machine according to claim 8, it is characterised in that：The receiver module includes：With it is described
The intermediate frequency filtering of the frequency mixer and frequency mixer connection of Vector Modulation carrier wave cancellation module and voltage controlled oscillator connection
Device and the intermediate frequency amplifier being connected with the intermediate-frequency filter.
10. a kind of super high frequency radio frequency recognizes reading/writing method, it is characterised in that the super high frequency radio frequency identification reading/writing method includes：
Transmission state：The rf modulated signal of write-in label is produced, and the rf modulated signal of label will be write with free space
In the form of electromagnetic wave conduct to label；
Reception state：Anneta module receives the signal returned from label, on the one hand by adjusting the impedance operator of coupling module,
Isolation is improved, the carrier signal power that transmitter module is leaked into receives link is reduced, is on the other hand carried by Vector Modulation
The reduction of ripple cancellation technology leaks into the carrier signal power in receives link, and the signal that label is returned retains.
11. super high frequency radio frequency identification reading/writing methods according to claim 10, it is characterised in that：Damaged with the insertion of coupling module
Consumption and isolation are used as the foundation for adjusting.
12. super high frequency radio frequency identification reading/writing methods according to claim 10, it is characterised in that：Reduction leaks into receives link
In the specific method of carrier signal power include：
Detection leaks into the carrier signal power value in receives link, and produces a control signal according to the value for detecting；
Radio frequency letter equal with the carrier-signal amplitude leaked into receives link, opposite in phase is produced according to the control signal
Number；
The radiofrequency signal is combined with the carrier signal leaked into receives link, with reducing and leaking into receives link
Carrier signal power, Hold sticker return signal.
13. super high frequency radio frequency identification reading/writing methods according to claim 12, it is characterised in that：Produce the radiofrequency signal
Specific method includes：
The control signal is converted into two groups of differential signals of I, Q, and gathers the carrier signal power value in receives link,
By two groups of differential signals of I, Q simultaneously controlled output signal amplitude and phase, to produce the radiofrequency signal.
14. super high frequency radio frequency identification reading/writing methods according to claim 13, it is characterised in that：The control accuracy of amplitude reaches
0.5dBm, the control accuracy of phase reaches 2 °.
15. radio frequency identification read-write methods according to claim 13, it is characterised in that：The control is quickly found out by dichotomy
The interval of signal processed, to determine the amplitude of the radiofrequency signal and the best region of phase rapidly.
16. super high frequency radio frequency identification reading/writing methods according to claim 10, it is characterised in that：Reduction is additionally included in leak into
After carrier signal in receives link, the RF signal power value that detection is received thinks to let out if detected value is less than setting value
Drain to the carrier signal in receives link and eliminated sufficiently small, receives link normal work is not influenceed；If detected value is big
The control signal is then adjusted in setting value, the carrier signal power leaked into receives link is further reduced.
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| CN107506819A (en) * | 2017-07-25 | 2017-12-22 | 浙江海洋大学 | The processing equipment of electric ray wireless identification tag |
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| CN109558759B (en) * | 2018-11-20 | 2021-05-14 | 电子科技大学 | Analog signal conditioning circuit for non-contact smart card electromagnetic attack |
| CN111753567A (en) * | 2019-03-27 | 2020-10-09 | 江苏彰旗物联网科技有限公司 | Radio frequency reader-writer and carrier cancellation method |
| CN110197088B (en) * | 2019-03-29 | 2023-03-17 | 深圳运宝通电子科技有限公司 | Device and method for improving receiving sensitivity of RFID multi-path reader-writer |
| CN110197088A (en) * | 2019-03-29 | 2019-09-03 | 深圳运宝通电子科技有限公司 | A kind of device and method improving RFID multichannel reader receiving sensitivity |
| CN111614364A (en) * | 2020-05-22 | 2020-09-01 | 南方科技大学 | RFID reader-writer and carrier suppression method thereof |
| CN112800790A (en) * | 2021-01-14 | 2021-05-14 | 杭州荣旗科技有限公司 | UHF reader-writer capable of automatically adjusting power consumption |
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