CN106291131A - RFID antenna detection method and device - Google Patents
RFID antenna detection method and device Download PDFInfo
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- CN106291131A CN106291131A CN201610673364.5A CN201610673364A CN106291131A CN 106291131 A CN106291131 A CN 106291131A CN 201610673364 A CN201610673364 A CN 201610673364A CN 106291131 A CN106291131 A CN 106291131A
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R29/10—Radiation diagrams of antennas
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Abstract
The present invention provides a kind of RFID antenna detection method and device, and wherein method comprises the steps: that the first power and second power of antenna echo of signal are launched in detection；Difference according to described first power and the second power determines antenna return loss；Judge that whether antenna return loss is less than setting threshold value to determine the quality of antenna performance.The present invention can detect the performance of connection status of antenna and antenna, the stability of timely monitoring aerial work the most in real time.
Description
Technical field
The present invention relates to technical field of RFID, particularly relate to a kind of RFID antenna detection method and device.
Background technology
Super high frequency radio frequency identification technology is a kind of remote non contact angle measurement technology, and wherein, antenna is super high frequency radio frequency
One of key link of identification system.The quality of antenna performance directly determines the operating distance of radio-frequency identification reader/writer.Antenna
Major parameter index include gain, standing wave, directivity etc., wherein gain determines the distance of the radio-frequency identification reader/writer area of coverage
And field intensity, directivity determines the area coverage of radio-frequency identification reader/writer, and standing wave is direct with the performance of radio-frequency identification reader/writer
Relevant.
Super high frequency radio frequency recognition read-write machine typically uses zero-intermediate-frequency architecture, and the high-power transmitting signal of transmitting chain can pass through
Antenna port reflexes to receive link, causes receiving the link linearity and is deteriorated, and improves background noise level.Therefore antenna is stayed
Ripple is the biggest, and transmitting chain reflexes to receive the leak level of link and noise level is the biggest, otherwise the least.If additionally, sky
Line standing wave is excessive or is not connected with under antenna situation, and radio-frequency identification reader/writer transmitting chain creates high-power signal, now may be used
Can cause two kinds of situations: 1. transmitting chain power device mismatch, reflection produces high-power self-excitation, breakdown power device；The most relatively
Strong Power leakage, to receiving link, causes receiving link device failure.
Existing antenna detection scheme includes voltage detecting, provides voltage by particular electrical circuit to antenna, if test side
Collect voltage and then illustrated that antenna connects, otherwise be then not connected with antenna.The structure of antenna is required by this method, antenna
Oscillator must with " " be connected, the oscillator of some antenna then cannot realize antenna detection function if disconnecting with ground, and this
There is unidirectional current because of antenna end in method, the performance of antenna is had certain impact.It addition, this method can only detect whether antenna connects
Connect and the performance of antenna cannot be detected.
Summary of the invention
It is an object of the invention to provide a kind of RFID antenna detection method and device, solve sky in prior art
The performance of line cannot detect, and whether antenna connects the technical problem that cannot accurately judge.
In order to solve above-mentioned technical problem, a kind of RFID antenna detection method of the present invention, comprise the steps:
The first power and second power of antenna echo of signal is launched in detection；
Difference according to described first power and the second power determines antenna return loss；
Judge that whether antenna return loss is less than setting threshold value to determine the quality of antenna performance.
As the further improvement of the present invention above-mentioned RFID antenna detection method, obtain first by logarithmic detector
Output voltage and the second output voltage, and determine the first power and the second power according to below equation:
P1=K × V1, P2=K × V2,
Wherein, K is the coefficient of logarithmic detector, and P1 is the first power, and V1 is the first output voltage, and P2 is the second power, and V2 is
Second output voltage.
As the further improvement of the present invention above-mentioned RFID antenna detection method, determine that antenna returns according to below equation
Ripple is lost:
RL=P1-P2-2 × L,
Wherein, RL is antenna return loss, and P1 is the first power, and P2 is the second power, and L is link attenuation.
As the further improvement of the present invention above-mentioned RFID antenna detection method, the value of link attenuation is according to specific guide
The value that logical link inquiry is corresponding is determined.
As the further improvement of the present invention above-mentioned RFID antenna detection method, in antenna return loss less than setting
During threshold value, determine that antenna condition is normal；Antenna return loss more than set threshold value time, determine connection status of antenna be open circuit or
Antenna performance is impaired.
In order to solve above-mentioned technical problem, a kind of RFID antenna detection device of the present invention, including:
Detector unit, for detecting the first power and the second power of antenna echo launching signal；
Return loss determines unit, for determining antenna return loss according to the difference of described first power and the second power；
Judging unit, for judging that whether antenna return loss is less than setting threshold value to determine the quality of antenna performance.
As the further improvement of the present invention above-mentioned RFID antenna detection device, described detector unit is examined by logarithm
Ripple device obtains the first output voltage and the second output voltage, and determines the first power and the second power according to below equation:
P1=K × V1, P2=K × V2,
Wherein, K is the coefficient of logarithmic detector, and P1 is the first power, and V1 is the first output voltage, and P2 is the second power, and V2 is
Second output voltage.
As the further improvement of the present invention above-mentioned RFID antenna detection device, described return loss determines unit root
Antenna return loss is determined according to below equation:
RL=P1-P2-2 × L,
Wherein, RL is antenna return loss, and P1 is the first power, and P2 is the second power, and L is link attenuation.
As the further improvement of the present invention above-mentioned RFID antenna detection device, the value of link attenuation is according to specific guide
The value that logical link inquiry is corresponding is determined.
As the further improvement of the present invention above-mentioned RFID antenna detection device, described judging unit is at antenna echo
Loss, less than when setting threshold value, determines that antenna condition is normal；In antenna return loss more than when setting threshold value, determine that antenna connects
State be open circuit or antenna performance impaired.
Compared with prior art, the present invention is by the transmitting signal power in detection radio-frequency identification reader/writer, antenna echo
Power, then by the relation between judgement transmitting signal power and antenna echo power to determine the quality of antenna performance, this
The result of sample detection is not affected by environmental change, and testing result is more accurate.The present invention can detect antenna the most in real time
Connection status and the performance of antenna, the stability of timely monitoring aerial work.
After reading in conjunction with the accompanying the detailed description of embodiment of the present invention, the other features and advantages of the invention will become more
Add clear.
Accompanying drawing explanation
In order to be illustrated more clearly that the technical scheme of embodiment of the present invention or prior art, below will to embodiment or
In description of the prior art, the required accompanying drawing used is briefly described, it is therefore apparent that the accompanying drawing in describing below is only this
Some embodiments described in invention, for those of ordinary skill in the art, in the premise not paying creative work
Under, it is also possible to other accompanying drawing is obtained according to these accompanying drawings.
Fig. 1 is RF identification forward link schematic diagram in an embodiment of the present invention.
Fig. 2 is RFID antenna detection method flow chart in an embodiment of the present invention.
Fig. 3 is RFID antenna detection device schematic diagram in an embodiment of the present invention.
Detailed description of the invention
Describe the present invention below with reference to each embodiment shown in the drawings.But these embodiments are not
Limit the present invention, structure, method or the change functionally that those of ordinary skill in the art is made according to these embodiments
Change and be all contained in protection scope of the present invention.
It should be noted that in various embodiments, identical label or labelling may be used, but these not generations
List structure or the relation that definitely contacts functionally.Further, " first ", " second ", " the 3rd " that be previously mentioned in each embodiment also
Not representative structure or relation of definitely distinguishing functionally, these are merely for convenience of description.
As it is shown in figure 1, RF identification forward link schematic diagram in an embodiment of the present invention.RF identification forward link bag
Include Base Band Unit 10, quadrature modulator 20, adjustable attenuator 30, power amplifier unit 40, bonder 50, logarithmic detector 60, annular
Device 70, antenna element 80.Antenna element 80 is for transceiving radio frequency signal, and antenna element 80 is from forward direction link definition standard not
With, it is also possible to not included in RF identification forward link, belong to a module outside RF identification forward link.Specifically,
Antenna element 80 includes front network 81 and antenna 82, and front network 81 is for between antenna 82 and RF identification forward link
Path, antenna 82 is provided to introduce the radiofrequency signal of forward link by front network 81.Front network 81 can include for receiving
Send out the device of isolation, including the device etc. of day line options.Antenna 82 is a kind of changer, and it is the leading of transmission above-the-line promotion
Ripple, is transformed into the electromagnetic wave propagated in unbounded medium (typically free space), or carries out contrary conversion, and antenna 82 is
Device for direct transceiving radio frequency signal.Base Band Unit 10 is used for controlling radiofrequency signal or Acquisition Circuit parameter, Base Band Unit
10 inside can include control circuit, is exported the control signal specified by control circuit.
Quadrature modulator 20, in the present embodiment, uses the framework of directly modulation to realize, and quadrature modulator 20 connects
Base Band Unit 10, is provided I road modulated signal, Q road modulated signal, quadrature modulator 20 by Base Band Unit 10 to quadrature modulator 20
Also receive local oscillation signal, it is preferable that quadrature modulator 20 connects the phase-locked loop frequency integrator of inside, by internal phaselocked loop
Frequency synthesizer provides local oscillation signal.Reception I road modulated signal and Q road modulated signal are loaded onto carrier wave by quadrature modulator 20,
I.e. according to local oscillation signal, modulated signal being carried out orthogonal modulation, quadrature modulator 20 is by penetrating from outfan output after orthogonal modulation
Frequently signal, i.e. needs the radiofrequency signal being radiate by antenna element 80.Because at a distance radio frequency recognizing electronic label being entered
Row identifies, so radiofrequency signal being launched power have certain requirement, so also needing to by other circuit radiofrequency signal
Process.In the present embodiment, the I road modulated signal of Base Band Unit 10 offer, Q road modulated signal are as modulated signal package
Information containing data communication, also comprises the amplitude power that can regulate modulating wave.By adjusting I road modulated signal, Q road modulation letter
Number can realize the fine tuning of modulating wave output.
Adjustable attenuator 30 connects the quadrature modulator 20 radiofrequency signal with reception quadrature modulator 20 output, is also connected with base
The control signal that tape cell 10 regulates with receiving attenuation amount.Adjustable attenuator 30 according to the control signal of Base Band Unit 10 to radio frequency
Signal carries out power adjustment.Preferably, adjustable attenuator 30 includes some sections in being numeral adjustable attenuator, i.e. adjustable attenuator
Attenuation module, attenuation module has different pad values according to actual, has several on-off circuits between attenuation module, by switch
Circuit close the combination in any turned in several attenuation module to realize the size of differential declines amount, closing of on-off circuit
Perform by receiving control signal.Therefore, provide control signal to realize defeated by Base Band Unit 10 to adjustable attenuator 30
Go out the adjustment of power.Adjustable attenuator can be specifically 6 figure place control adjustable step attenuators, the minimum control of adjustable attenuator
Not only up to 0.5dB, can realize the accurate step by step modulating of output, radiofrequency signal can realize amplitude range through adjustable attenuator
The change of about 31.5dB.
Connect the power amplifier unit 40 of adjustable attenuator 30 for amplifying the power of radiofrequency signal, it is preferable that power amplifier unit 40
Including driving amplifier 41 and power amplifier 43, power amplifier 43 connects driving amplifier 41 and amplifies as the second level, drives
Dynamic amplifier 41 inputs to power amplifier 43 after then being amplified by signal, finally form high-power output letter through power amplifier 43
Number launch eventually through bonder 50, antenna element 80 etc..Driving amplifier 41, i.e. driving stage amplifier, by self
Gain so that overall power can drive power amplifier 43 to export enough power.Power amplifier 43 is final amplifier,
Provide the peak power output of the required configuration of radio-frequency identification reader/writer.In RF identification forward link in present embodiment,
The linear circuit of HDR is formed, additionally, power amplifier 43 also fills by adjustable attenuator 30 and driving amplifier 41
Divide and make use of this design of Reducing Rating, it can be ensured that forward link has the sufficiently high linearity, prevent the radiofrequency signal launched non-
Linear zone produces the phenomenon such as deformation or intermodulation.
It addition, radio-frequency identification reader/writer is typically all arranged on open air, the change of external environment condition is easy to affect radio frequency and knows
The radiofrequency signal of forward link in other read write line, and radio-frequency identification reader/writer is after starting up, and internal temperature also can be sent out
The biggest raw change, the most this impact can cause the change of output the biggest.In a preferred embodiment, in order to eliminate
This impact, arranges temperature compensation attenuator 42, the decay of temperature compensation attenuator 42 between driving amplifier 41 and power amplifier 43
Be worth linear with variations in temperature, can under temperature variations the entire gain of effective correcting circuit.Specifically, temperature is worked as
When degree rises, the decay of amplifying device gain reduction and temperature compensation attenuator also diminishes；Otherwise, upon a drop in temperature, amplifying device
Gain increase and the decay of temperature compensation attenuator becomes big the most therewith.The environmental characteristics utilizing temperature compensation attenuator can effectively reduce environment
Temperature is on the impact of the output of RF identification forward link in radio-frequency identification reader/writer so that output is maintained at one
Relatively steady state.
Bonder 50 is mainly used in the coupling radiofrequency signal that riches all the way penetrates and is used as power detection.The input of bonder 50 is even
Connecing power amplifier unit 40, radiofrequency signal is radiate by the outfan of bonder 50 by antenna element 80, the coupling of bonder 50
End connects logarithmic detector 60, and logarithmic detector 60 obtains radiofrequency signal by coupling.In order to cost-effective, bonder 50 is preferred
Ground is strip line coupler, including two quarter-wave microstrip lines, the first quarter-wave being respectively parallel to each other
Microstrip line and the second quarter-wave microstrip line, one end of the first quarter-wave microstrip line connects power amplifier as input
Unit 40, the other end of the first quarter-wave microstrip line connects antenna element 80 as outfan, more embodiment party
In formula, it is connected between antenna element 80 with the other end of the first quarter-wave microstrip line and has circulator 70, below will be in detail
Stating, radiofrequency signal is radiate by the other end of the i.e. first quarter-wave microstrip line by antenna element 80.Two or four point
One of wave microstrip line one end as coupled end connect logarithmic detector 60, provide radiofrequency signal to logarithmic detector 60.Need
Be noted that the embodiment of bonder is not described as limit with above-mentioned, however not excluded that can use directional coupler etc. other
Power coupling circuit replaces.
Logarithmic detector 60, is the preferred implementation of power detecting unit, and the radiofrequency signal that will be coupled into transfers voltage to
Parameter, will carry out magnitude demodulator to radiofrequency signal, the amplitude information of radiofrequency signal is changed into voltage signal linearly.Logarithm
First outfan linker tape cell 10 of cymoscope 60, the first outfan output first input end input of logarithmic detector 60
The voltage signal that is converted into of radiofrequency signal obtain transmission power level to Base Band Unit 10, Base Band Unit 10 by voltage signal,
Base Band Unit 10 adjusts quadrature modulator 20 and adjustable attenuator 30, the control after i.e. being adjusted by output according to transmission power level
Signal is to quadrature modulator 20 and adjustable attenuator 30.Such as, transmission power level is not up to designated value, just strengthens quadrature modulator
The output of 20 or the decay of reduction adjustable attenuator 30.
In the present embodiment, Base Band Unit 10 includes processor 11 and analog-digital converter 13(ADC, Analog-to-
Digital Converter), the input of analog-digital converter 13 receives the voltage signal of logarithmic detector 60 output, by interior
Portion processes and is converted into digital signal, connects processor 11 from the outfan of analog-digital converter 13 and provides it transmission power level.Place
Reason device 11 by connect digital to analog converter 12(DAC, Digital-to-Analog Converter) input output control letter
Number, the outfan of digital to analog converter 12 connects quadrature modulator 20, the digital command that processor 11 is generated by digital to analog converter 12
Be converted to modulated signal, i.e. digital to analog converter 12 receive the digital signal of processor 11 the I road modulated signal being converted into correspondence,
Q road modulated signal.
In a preferred embodiment, circulator 70, circulator 70 it are additionally provided with between bonder 50 and antenna element 80
The first end 71 connect the outfan of bonder 50, the second end 72 of circulator 70 connects antenna element 80, the of circulator 70
Three ends 73 connect the second input of logarithmic detector 60, and in the present embodiment, logarithmic detector 60 is dual input logarithm
Cymoscope.The acting as of circulator 70 can protect power amplifier the most breakdown, additionally under antenna element 80 no-load condition
The echo-signal detection for antenna condition of antenna 82 can also be extracted.Preferably, at the 3rd end 73 of circulator 70 with right
It is provided with bonder 91, for preventing logarithmic detector 60 from being crossed high energy by what antenna element 80 reflected between number cymoscope 60
Amount is damaged.Specifically, the input of bonder 91 connects the 3rd end 73 of circulator 70, and the outfan connection of bonder 91 has negative
Carrying 92, the coupled end of bonder 91 connects the second input of logarithmic detector 60.
Because three port direction characteristics of circulator 70 self, when the first end 71 of circulator 70 is input, the
Two ends 72 are outfan, and the 3rd end 73 is isolation end, and the signal of the outfan output of bonder 50 is from the first end of circulator 70
71 the second ends 72 flowing to circulator 70, are transmitted further to antenna element 80, without being received by logarithmic detector 60.Work as annular
When second end 72 of device 70 is input, the 3rd end 73 of circulator 70 is outfan, and the first end 71 of circulator 70 is isolation
End, therefore the echo-signal of antenna 82 flows to the 3rd end 73 of circulator 70 by the second end 72 of circulator 70, will not transmit
To power amplifier 43, also the signal reflected will be caused to burn out power amplifier 43 because of zero load.Setting of circulator 70
Put and can reduce the reflection of high-power signal under no-load condition, be prevented effectively from hitting of may causing under power amplifier mismatch Conditions
Wear phenomenon so that safety and the reliability of circuit are greatly promoted.
As it has been described above, by antenna echo power being detected with coordinating of circulator 70.Returning of antenna 82
Ripple signal can be exported to logarithmic detector 60 by the 3rd end 73 of circulator 70, and logarithmic detector 60 is by the echo of antenna 82
The amplitude information of signal flows to processor 11 after being changed into voltage signal linearly and being supplied to analog-digital converter 13 sampling, place
Reason device 11 can calculate the echo of antenna by the data received.
The transmitting signal power of radio-frequency identification reader/writer and the detection of antenna echo power, can pass through above-mentioned embodiment
In bonder 50, circulator 70 and logarithmic detector 60 between cooperation realize, but it should be recognized that realize detection side
Formula is not limited thereto.Launch signal main path signal after bonder 50 and enter circulator 70, the signal of bonder 50 coupled end
Enter logarithmic detector 60 and carry out amplitude detection.Main signal enter circulator 70 aft antenna unit 80 launch, wherein because
The return loss of antenna 82 is understood some power and is reflected back, and reflected signal enters after front network 81 and circulator 70
Logarithmic detector 60 carries out antenna echo power detection.The signal launching signal power and antenna echo power the most at last is transferred to
Base Band Unit 10 processes.As in figure 2 it is shown, RFID antenna detection method flow chart in an embodiment of the present invention.Penetrate
Frequency identifies that antenna detection method comprises the steps:
Step S1, the first power and second power of antenna echo of signal is launched in detection.As a example by Fig. 1 illustrated embodiment,
Launch signal to need to be radiate by antenna element 80, in order to transmitting signal can be detected after power amplifier unit 40 amplifies
Power, couple a road signal by bonder 50 and enter logarithmic detector, by the logarithmic detector power to launching signal
Detect.Antenna echo is a part of radiofrequency signal reflected by antenna 82, through the second end, the ring of circulator 70
3rd end of shape device 70, is the most also made by logarithmic detector and detects the power of antenna echo.As it has been described above, logarithm inspection
Ripple device is that the amplitude information of radiofrequency signal is changed into voltage signal output, in the present embodiment, voltage signal quilt linearly
Analog-digital converter 13 is converted to digital signal, the voltage value that final acquisition is concrete, and therefore detection power is line with output voltage
Sexual relationship.Because logarithmic detector determines that, so the coefficient of logarithmic detector is a pre-determined value, will not occur
Change.Launch the power of signal, the power of antenna echo can be determined by the output voltage of logarithmic detector.This embodiment party
In formula, logarithmic detector is dual input logarithmic detector, can detect transmitting signal and the power of antenna echo simultaneously.Specifically
Ground, obtains the first output voltage and the second output voltage by logarithmic detector, and according to below equation determine the first power and
Second power:
P1=K × V1, P2=K × V2,
Wherein, K is the coefficient of logarithmic detector, and P1 is the first power, and V1 is the first output voltage, and P2 is the second power, and V2 is
Second output voltage.Preferably, during detection or before detection, set radio-frequency identification reader/writer and work as fixed frequency,
It is in single carrier emission mode, it is ensured that the stability of power detection and accuracy.
Step S2, determines antenna return loss according to the difference of described first power and the second power.Because applying in reality
In, transmitting power is probably due to the situations such as variations in temperature cause power excursion, so the power of antenna echo also has error, logical
The difference crossing the first power and the second power determines antenna return loss, can balance out the error impact of this part well.Excellent
Selection of land, determines antenna return loss according to below equation:
RL=P1-P2-2 × L,
Wherein, RL is antenna return loss, and P1 is the first power, and P2 is the second power, and L is link attenuation.Formula also draws
Having entered link attenuation, the mainly impact on the link device such as circulator, front network is analyzed, because antenna echo is to send out
Penetrate signal and arrive antenna by circulator, front network etc., go back from antenna-reflected the most again.Link attenuation is by link
Concrete device determines, and in circuit, device also determines that constant, so link attenuation is a pre-determined steady state value,
Can realize by being previously set.In more embodiment, especially at radio-frequency identification reader/writer, there is multiple antennas
In the case of, front network includes switching network, is specifically as follows antenna selection switch circuit, by antenna selection switch circuit
Ensure that radiofrequency signal launched by the antenna that radio-frequency identification reader/writer is corresponding.And in reality application, radio-frequency identification reader/writer connects
Performance between the port of different antennae the most difference, concordance is the most very poor, accurate in order to ensure antenna return loss
Property, it is previously stored the link attenuation value of multiple corresponding different links, determining antenna return loss when, according to specific guide
The value that logical link inquiry is corresponding, such as, radio-frequency identification reader/writer is opened No. 1 antenna and radiofrequency signal is radiate, and just passes through
Inquiry obtains an antenna corresponding ports and the link attenuation value of link, and calculates according to above-mentioned formula.
Step S3, it is judged that whether antenna return loss is less than setting threshold value to determine the quality of antenna performance.Set threshold value
Can be in advance by test, the max-thresholds of the antenna return loss that the radio-frequency identification reader/writer drawn can bear, it is possible to
With determine according to engineering experience etc..Antenna return loss, less than setting threshold value, illustrates the performance of antenna the most very well, antenna
Return loss, more than setting threshold value, illustrates that the performance of antenna is the most bad.Specifically, in antenna return loss less than setting threshold value
Time, determine that antenna condition is normal；In antenna return loss more than when setting threshold value, determine that connection status of antenna is open circuit or antenna
Performance impairment, connects including antenna and goes wrong, or antenna is probably due to the situations such as water inlet, overbending, corrosion cause sky
By communication unit, line cisco unity malfunction, the most preferably can notify that Field Force overhauls in time, or according to need
Antenna is changed in time.
As it is shown on figure 3, RFID antenna detection device schematic diagram in an embodiment of the present invention.RFID antenna is examined
Survey device and include that detector unit E1, return loss determine unit E2, judging unit E3.
Detector unit E1 is for detecting the first power and the second power of antenna echo launching signal.With reference to RF identification
The embodiment of antenna detection method, the power launching signal can be examined by logarithmic detector by coupling a road signal
Surveying, antenna echo obtains the detection of the second power by the directional transmissions characteristic of circulator, and logarithmic detector can be that two-way is defeated
Enter logarithmic detector, including first input end and the second input, receive respectively and launch signal and the power detection of antenna echo.
It should be noted that realize the first power, the detection of the second power is not precluded from using other power detecting unit to realize.At tool
In the embodiment of body, detector unit E1 obtains the first output voltage and the second output voltage by logarithmic detector, and according to
Below equation determines the first power and the second power:
P1=K × V1, P2=K × V2,
Wherein, K is the coefficient of logarithmic detector, and P1 is the first power, and V1 is the first output voltage, and P2 is the second power, and V2 is
Second output voltage.The coefficient of logarithmic detector is determined by logarithmic detector, is therefore constant, K be one in advance really
Fixed constant, directly invokes the most permissible when determining the first power, the second power.Detector unit E1 preferably can also set and penetrate
Frequency identifies that read write line is fixed frequency work, makes radio-frequency identification reader/writer be in single carrier emission mode.
Return loss determines that unit E2 is for determining antenna return loss according to the difference of described first power and the second power.
As described in RFID antenna detection method embodiment, determine antenna return loss by the difference of the first power and the second power
Effectively the error that drift brings can be canceled each other out.Specifically, return loss determines that unit E2 is true according to below equation
Determine antenna return loss:
RL=P1-P2-2 × L,
Wherein, RL is antenna return loss, and P1 is the first power, and P2 is the second power, and L is link attenuation.L is according to different chains
Road can be previously stored different values, obtains, by the way of inquiry, the link attenuation specified, and therefore, the value of link attenuation is permissible
The value of the link inquiry correspondence according to specific conducting is determined.
Judging unit E3 is for judging that whether antenna return loss is less than setting threshold value to determine the quality of antenna performance.If
Determining threshold value can rule of thumb or a constant determining of engineering practice, the antenna return loss that return loss unit E2 determines
Less than setting threshold value, the performance of antenna or relatively good be described, if antenna return loss is more than setting threshold value, antenna is described
Poor-performing, there is a problem.In a preferred embodiment, it is judged that unit E3 is less than in antenna return loss and sets threshold value
Time, determine that antenna condition is normal；In antenna return loss more than when setting threshold value, determine that connection status of antenna is open circuit or antenna
Performance impairment.The detailed description of the invention of RFID antenna detection device can also be with reference to the tool of RFID antenna detection method
Body embodiment.
In conjunction with method and technology scheme disclosed in the present application, can be embodied directly in hardware, by control unit perform soft
Part module or the two combination, i.e. one or more steps and/or one or more steps combination, both can correspond to computer journey
Each software module of sequence flow process, can also correspond to each hardware module, such as ASIC(Application Specific
Integrated Circuit, special IC), FPGA(Field-Programmable Gate Array, scene can be compiled
Journey gate array) or other PLDs, discrete gate or transistor logic, discrete hardware components or it is the suitableeest
Work as combination.For convenience of description, when describing said apparatus, it is divided into various module to be respectively described with function, certainly, implements this
The function of each module can be realized in same or multiple softwares and/or hardware during application.
As seen through the above description of the embodiments, those skilled in the art it can be understood that to the application can
The mode adding required general hardware platform by software realizes.Based on such understanding, the technical scheme essence of the application
On the part that in other words prior art contributed can embody with the form of software product.This software is by microcontroller list
Unit performs, and depends on required configuration, can include any kind of one or more micro-control unit, include but not limited to
Micro-control unit, microcontroller, DSP(Digital Signal Processor, Digital Signals unit) or its any group
Close.This software is stored in memorizer, such as, and volatile memory (such as random-access memory etc.), nonvolatile memory
(such as, read only memory, flash memory etc.) or its combination in any.
In sum, the present invention is by the transmitting signal power in detection radio-frequency identification reader/writer, antenna echo power, so
Afterwards by the relation between judgement transmitting signal power and antenna echo power to determine the quality of antenna performance, so detect
Result is not affected by environmental change, and testing result is more accurate.The present invention can detect connection status of antenna the most in real time
And the performance of antenna, the stability of timely monitoring aerial work.
It is to be understood that, although this specification is been described by according to embodiment, but the most each embodiment only comprises one
Individual independent technical scheme, this narrating mode of description is only that for clarity sake those skilled in the art should will say
Bright book is as an entirety, and the technical scheme in each embodiment can also be through appropriately combined, and forming those skilled in the art can
With other embodiments understood.
The a series of detailed description of those listed above is only for the feasibility embodiment of the present invention specifically
Bright, they also are not used to limit the scope of the invention, all equivalent implementations made without departing from skill of the present invention spirit
Or change should be included within the scope of the present invention.
Claims (10)
1. a RFID antenna detection method, it is characterised in that comprise the steps:
The first power and second power of antenna echo of signal is launched in detection；
Difference according to described first power and the second power determines antenna return loss；
Judge that whether antenna return loss is less than setting threshold value to determine the quality of antenna performance.
RFID antenna detection method the most according to claim 1, it is characterised in that obtain the by logarithmic detector
One output voltage and the second output voltage, and determine the first power and the second power according to below equation:
P1=K × V1, P2=K × V2,
Wherein, K is the coefficient of logarithmic detector, and P1 is the first power, and V1 is the first output voltage, and P2 is the second power, and V2 is
Second output voltage.
RFID antenna detection method the most according to claim 1, it is characterised in that determine antenna according to below equation
Return loss:
RL=P1-P2-2 × L,
Wherein, RL is antenna return loss, and P1 is the first power, and P2 is the second power, and L is link attenuation.
RFID antenna detection method the most according to claim 3, it is characterised in that the value of link attenuation is according to specific
The value that the link inquiry of conducting is corresponding is determined.
5. according to the RFID antenna detection method described in any one of claim 1-4, it is characterised in that damage at antenna echo
Consumption, less than when setting threshold value, determines that antenna condition is normal；In antenna return loss more than when setting threshold value, determine that antenna connects shape
State be open circuit or antenna performance impaired.
6. a RFID antenna detection device, it is characterised in that including:
Detector unit, for detecting the first power and the second power of antenna echo launching signal；
Return loss determines unit, for determining antenna return loss according to the difference of described first power and the second power；
Judging unit, for judging that whether antenna return loss is less than setting threshold value to determine the quality of antenna performance.
RFID antenna the most according to claim 6 detection device, it is characterised in that described detector unit passes through logarithm
Cymoscope obtains the first output voltage and the second output voltage, and determines the first power and the second power according to below equation:
P1=K × V1, P2=K × V2,
Wherein, K is the coefficient of logarithmic detector, and P1 is the first power, and V1 is the first output voltage, and P2 is the second power, and V2 is
Second output voltage.
RFID antenna the most according to claim 6 detection device, it is characterised in that described return loss determines unit
Antenna return loss is determined according to below equation:
RL=P1-P2-2 × L,
Wherein, RL is antenna return loss, and P1 is the first power, and P2 is the second power, and L is link attenuation.
RFID antenna the most according to claim 8 detection device, it is characterised in that the value of link attenuation is according to specific
The value that the link inquiry of conducting is corresponding is determined.
10. detect device according to the RFID antenna according to any one of claim 6-9, it is characterised in that described judgement
Unit less than when setting threshold value, determines that antenna condition is normal in antenna return loss；In antenna return loss more than setting threshold value
Time, determine connection status of antenna be open circuit or antenna performance impaired.
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| CN201610673364.5A CN106291131A (en) | 2016-08-16 | 2016-08-16 | RFID antenna detection method and device |
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| CN201610673364.5A CN106291131A (en) | 2016-08-16 | 2016-08-16 | RFID antenna detection method and device |
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| CN109391307A (en) * | 2017-08-04 | 2019-02-26 | 维沃移动通信有限公司 | A kind of antenna beam detecting system, method and mobile terminal |
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| CN109391307A (en) * | 2017-08-04 | 2019-02-26 | 维沃移动通信有限公司 | A kind of antenna beam detecting system, method and mobile terminal |
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| CN113708852A (en) * | 2020-05-21 | 2021-11-26 | 华为技术有限公司 | Antenna in-situ detection method and device |
| CN113708852B (en) * | 2020-05-21 | 2022-11-11 | 华为技术有限公司 | Antenna in-situ detection method and device |
| CN113285770A (en) * | 2021-05-12 | 2021-08-20 | 展讯通信（上海）有限公司 | Antenna state detection method, device, system, electronic equipment and storage medium |
| CN117289235A (en) * | 2023-11-24 | 2023-12-26 | 成都凌亚科技有限公司 | Antenna radar multichannel signal acquisition processing equipment and method |
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