CN108073841A - A kind of intelligent antenna system for RFID label tag - Google Patents
A kind of intelligent antenna system for RFID label tag Download PDFInfo
- Publication number
- CN108073841A CN108073841A CN201611010802.6A CN201611010802A CN108073841A CN 108073841 A CN108073841 A CN 108073841A CN 201611010802 A CN201611010802 A CN 201611010802A CN 108073841 A CN108073841 A CN 108073841A
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- Prior art keywords
- signal
- circuit
- signal strength
- reception antenna
- antenna system
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Classifications
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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
- G06K7/10297—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 arrangements for handling protocols designed for non-contact record carriers such as RFIDs NFCs, e.g. ISO/IEC 14443 and 18092
Abstract
The present invention provides a kind of intelligent antenna system for RFID label tag.The intelligent antenna system includes the reception antenna being sequentially connected, signal strength extraction circuit, zoom comparison circuit and switch switching circuit, wherein, reception antenna mutually forms an angle for magnetic flux（Angle is equal to 180 degree/N, N >=2）Aerial array, each reception antenna includes inductance and capacitance, the LC receiving circuits that inductance capacitance composition resonant frequency is 13.56MHz, LC receiving circuits receive the modulated signal from reader, and input signal Vin1 VinN, the Vin1 VinN for generating signal strength extraction circuit are modulated signal of the carrier wave in 13.56MHz.Present invention employs novel mentalities of designing, compare selection magnetic flux by weighting and mutually form an angle（Angle is equal to 180 degree/N, N >=2）Aerial array in signal all the way, add the ability that label resists complex electromagnetic environment, the effective sensitivity for improving label demodulator circuit and its environmental suitability.
Description
Technical field
The present invention relates to a kind of labels for meeting 1443 standard agreements of ISO/IEC（tag）, particularly for RFID label tag
Intelligent antenna system.
Background technology
RFID（Radio frequency identification, radio frequency identification）Communication system includes a reader
（reader）With several labels（tag）.ISO/IEC 1443 is a kind of near field RFID systems standard agreement, the carrier wave work of the standard
Working frequency is 13.56MHz, and communication distance is related to PCD usually between 0-10cm（Local coupling equipment, is equivalent to reader）
With PICC（Neighbouring card is equivalent to label）Between both-way communication.The different definition of mode is sent and received according to signal
Two kinds of type of card of TYPEA and TYPEB, their modulation depth for being differing principally in that carrier wave and the coding staff of binary number
Formula.
TYPE-A types are when PCD transmits signal to PICC using improved Miller coding modes, 100%ASK modulation.
It is encoded when PICC transmits signal to PCD using Manchester, OOK modulation.
TYPE-B types are when PCD transmits signal to PICC using improved nrz encoding mode, 10%ASK modulation.
PICC uses NRZ-L to encode when transmitting signal to PCD, BPSK modulation.
Meet the existing RFID system of 1443 standard agreements of ISO/IEC, as shown in Figure 1, mainly including PCD and PICC two
Part, wherein PICC include aerial coil, microcontroller, automatic gain amplification filter module, ASK demodulator circuits and decoder
Signal that PCD sends is received after automatic gain amplification filter module amplification filtering Deng, aerial coil, and ASK demodulator circuits carry out
It is decoded after envelope detection demodulation.For different application scenarios, communication distance and PCD equipment, what aerial coil received
Signal strength can be influenced changing for occurrence scene by space electromagnetic environment, and a kind of simple antenna system in direction can not adapt to multiple
Miscellaneous electromagnetic environment influences sending and receiving for signal.
The content of the invention
It is insufficient present in for the above-mentioned prior art, meet ISO/IEC 1443 the object of the present invention is to provide one kind and assist
The intelligent antenna system of the label of view can adapt to complicated electromagnetic environment.
In order to reach above-mentioned technical purpose, the technical solution adopted in the present invention is：
A kind of intelligent antenna system for RFID label tag, the intelligent antenna system include the reception antenna being sequentially connected, letter
Number intensity extraction circuit, zoom comparison circuit and switch switching circuit, wherein, reception antenna mutually forms an angle for magnetic flux
（Angle is equal to 180 degree/N, N >=2）Aerial array, each reception antenna include inductance and capacitance, inductance capacitance composition resonance
Frequency is the LC receiving circuits of 13.56MHz, and LC receiving circuits receive the modulated signal from reader, and generate signal strength
Input signal the Vin1 VinN, Vin1-VinN for extracting circuit are modulated signal of the carrier wave in 13.56MHz；
Signal strength extraction circuit includes logarithmic amplification wave detector and low-pass filter, and logarithmic amplification wave detector sends out reception antenna
The 13.56MHz signal Vin1 VinN come carry out logarithmic amplification, and carry out peak detection, obtain the envelope comprising modulation intelligence and believe
Number Vr1-VrN, after envelope signal Vr1-VrN is by low-pass filter, obtains and the relevant direct current ordinary mail of input signal strength
Number Vrssi1-VrssiN；
Zoom comparison circuit includes operational amplifier and comparator, and operational amplifier will be above-mentioned relevant straight with input signal strength
Stream level signal Vrssi1-VrssiN is weighted amplification, respectively obtains each road output signal Vline1-VlineN, comparator
Input terminal meet the output signal Vline1-VlineN of operational amplifier respectively, obtain each road antenna signal strength weighting and compare
Output result Vcomp；
The input terminal of switch switching circuit is respectively connected to the output signal Vin1-VinN of reception antenna, and control terminal is amplification ratio
Compared with the output signal Vcomp of circuit, output signal Vchose is sent into follow-up signal demodulator circuit.
Preferably, the intelligent antenna system meets 1443 agreements of ISO/IEC.
Preferably, the logarithmic amplification wave detector is the logarithmic amplification wave detector of high dynamic range.
Preferably, the passband of the low-pass filter is less than the modulation rate of envelope signal Vr.
The comparator is zero-crossing comparator or hysteresis comparator.
Preferably, the switch switching circuit is thrown for a hilted broadsword N（N≥2）High Frequency Analog Switch.
The present invention employs novel mentality of designing for the smart antenna method of RFID label tag, compares selection by weighting
Magnetic flux mutually forms an angle（Angle is equal to 180 degree/N, N >=2）Aerial array in signal all the way, add label resistance
The ability of complex electromagnetic environment, the effective sensitivity for improving label demodulator circuit and its environmental suitability.
The present invention will be further described with reference to the accompanying drawings and detailed description.
Description of the drawings
Fig. 1 is existing RFID system structure diagram.
Fig. 2 is the intelligent antenna system structure diagram of the present invention.
Fig. 3 is the intelligent antenna system structure diagram that the present invention is embodied.
Specific embodiment
Referring to Fig. 2, for the intelligent antenna system structure diagram of the present invention.The intelligent antenna system includes being sequentially connected
Reception antenna, signal strength extraction circuit, zoom comparison circuit and switch switching circuit, wherein, the intelligent antenna system
Meet 1443 agreements of ISO/IEC, circuit, zoom comparison circuit and opened including the reception antenna that is sequentially connected, signal strength extraction
Switching circuit is closed, wherein, reception antenna mutually forms an angle for magnetic flux（Angle is equal to 180 degree/N, N >=2）Aerial array,
Each reception antenna includes inductance and capacitance, the LC receiving circuits that inductance capacitance composition resonant frequency is 13.56MHz, and LC is received
Circuit receives the modulated signal from reader, and generates input signal the Vin1 VinN, Vin1- of signal strength extraction circuit
VinN is modulated signal of the carrier wave in 13.56MHz；Signal strength extraction circuit includes logarithmic amplification wave detector and low-pass filtering
Device, logarithmic amplification wave detector are the logarithmic amplification wave detector of high dynamic range, and the passband of low-pass filter is less than envelope signal
Modulation rate；Logarithmic amplification wave detector carries out logarithmic amplification to the 13.56MHz signal Vin1 VinN that reception antenna is sent, and
Peak detection is carried out, obtains including the envelope signal Vr1-VrN of modulation intelligence, envelope signal Vr1-VrN passes through low-pass filter
Afterwards, obtain and the relevant DC level signal Vrssi1-VrssiN of input signal strength；Zoom comparison circuit includes operation amplifier
Device and comparator, operational amplifier are carried out above-mentioned with the relevant DC level signal Vrssi1-VrssiN of input signal strength
Weighting amplification, respectively obtains each road output signal Vline1-VlineN, and comparator is zero-crossing comparator or hysteresis comparator,
Its input terminal meets the output signal Vline1-VlineN of operational amplifier respectively, obtains each road antenna signal strength weighting and compares
Output result Vcomp；Switch switching circuit is thrown for a hilted broadsword N（N≥2）High Frequency Analog Switch, input terminal connects respectively
Enter the output signal Vin1-VinN of reception antenna, control terminal is the output signal Vcomp of zoom comparison circuit, and output is believed
Number Vchose is sent into follow-up signal demodulator circuit.
Referring to Fig. 3, the intelligent antenna system structure diagram being embodied for the present invention.The intelligent antenna system include according to
Mutually perpendicular two receiving antenna arrays of secondary connected magnetic flux, signal strength extraction circuit, zoom comparison circuit and switch
Switching circuit.Mutually perpendicular two reception antennas of magnetic flux all include respective inductance and capacitance, and inductance capacitance composition is humorous
Vibration frequency is the LC receiving circuits of 13.56MHz, which receives from reader（reader）Modulated signal, and
The input signal Vin1 and Vin2, Vin1 and Vin2 for generating the signal strength extraction module are modulation of the carrier wave in 13.56MHz
Signal；Signal strength extraction module includes the logafier of high dynamic range, peak detector and low-pass filter；The module
To signal Vin1 and Vin2 the progress logarithmic amplification for the 13.56MHz that two reception antennas are sent, and peak detection is carried out, obtained
Envelope signal Vr1 and Vr2 comprising modulation intelligence；The envelope signal is less than the low of the modulation rate of envelope signal by passband
After bandpass filter, obtain and the relevant DC level signal Vrssi1 and Vrssi2 of input signal strength；Zoom comparison module bag
Include two operational amplifiers and a comparator, the operational amplifier is by above-mentioned with the relevant direct current ordinary mail of input signal strength
Number Vrssi1 and Vrssi2 is weighted amplification, respectively obtains two paths of signals Vline1 and Vline2；The comparator can be
Zero comparator or hysteresis comparator, two input terminals of comparator connect respectively operational amplifier output signal Vline1 and
Vline2 obtains the output result Vcomp that the weighting of two-way antenna signal strength is compared；It is double that switching module includes a hilted broadsword
The High Frequency Analog Switch thrown, two input terminals of the switch connect the output signal of mutually perpendicular two reception antennas of magnetic flux respectively
Vin1 and Vin2；Its control terminal is the output signal Vcomp of zoom comparison module；It exports signal Vchose and is sent into follow-up signal
Demodulator circuit.
The present invention is used for the intelligent antenna system of RFID label tag, it then follows 1443 standard agreements of ISO/IEC, to label
The reception antenna system of 13.56MHz carrier channels is designed, using mutually perpendicular two reception antennas of magnetic flux, according to
The quality of its modulated signal received, selects antenna used in reception system, to adapt to complicated magnetic field environment, improves RFID
The receiving sensitivity and environmental suitability of label.
The present invention is not limited to embodiment discussed above, more than the description of specific embodiment is intended to retouch
It states and illustrates technical solution of the present invention.The obvious conversion or replacement enlightened based on the present invention should also be as being considered
Fall into protection scope of the present invention；Above specific embodiment is used for disclosing the optimal implementation of the present invention, so that this
The those of ordinary skill in field can apply numerous embodiments of the invention and a variety of alternatives to reach the present invention's
Purpose.
Claims (6)
1. a kind of intelligent antenna system for RFID label tag, which is characterized in that the intelligent antenna system includes being sequentially connected
Reception antenna, signal strength extraction circuit, zoom comparison circuit and switch switching circuit, wherein, reception antenna is magnetic flux
Mutually form an angle（Angle is equal to 180 degree/N, N >=2）Aerial array, each reception antenna include inductance and capacitance, inductance
The LC receiving circuits that capacitance composition resonant frequency is 13.56MHz, LC receiving circuits receive the modulated signal from reader, and
Input signal the Vin1 VinN, Vin1-VinN for generating signal strength extraction circuit are modulated signal of the carrier wave in 13.56MHz；
Signal strength extraction circuit includes logarithmic amplification wave detector and low-pass filter, and logarithmic amplification wave detector sends out reception antenna
The 13.56MHz signal Vin1 VinN come carry out logarithmic amplification, and carry out peak detection, obtain the envelope comprising modulation intelligence and believe
Number Vr1-VrN, after envelope signal Vr1-VrN is by low-pass filter, obtains and the relevant direct current ordinary mail of input signal strength
Number Vrssi1-VrssiN；
Zoom comparison circuit includes operational amplifier and comparator, and operational amplifier will be above-mentioned relevant straight with input signal strength
Stream level signal Vrssi1-VrssiN is weighted amplification, respectively obtains each road output signal Vline1-VlineN, comparator
Input terminal meet the output signal Vline1-VlineN of operational amplifier respectively, obtain each road antenna signal strength weighting and compare
Output result Vcomp；
The input terminal of switch switching circuit is respectively connected to the output signal Vin1-VinN of reception antenna, and control terminal is amplification ratio
Compared with the output signal Vcomp of circuit, output signal Vchose is sent into follow-up signal demodulator circuit.
2. intelligent antenna system as described in claim 1, which is characterized in that the intelligent antenna system meets ISO/IEC
1443 agreements.
3. logarithmic amplification wave detector as described in claim 1, which is characterized in that the logarithmic amplification wave detector is high dynamic range
The logarithmic amplification wave detector enclosed.
4. low-pass filter as described in claim 1, which is characterized in that the passband of the low-pass filter is believed less than envelope
Number modulation rate.
5. comparator as described in claim 1, which is characterized in that the comparator is that zero-crossing comparator or sluggishness compare
Device.
6. switch switching circuit as described in claim 1, which is characterized in that the switch switching circuit is thrown for a hilted broadsword N
（N≥2）High Frequency Analog Switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611010802.6A CN108073841A (en) | 2016-11-17 | 2016-11-17 | A kind of intelligent antenna system for RFID label tag |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611010802.6A CN108073841A (en) | 2016-11-17 | 2016-11-17 | A kind of intelligent antenna system for RFID label tag |
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| Publication Number | Publication Date |
|---|---|
| CN108073841A true CN108073841A (en) | 2018-05-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201611010802.6A Pending CN108073841A (en) | 2016-11-17 | 2016-11-17 | A kind of intelligent antenna system for RFID label tag |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070096878A1 (en) * | 2005-10-31 | 2007-05-03 | Kazushi Yamasaki | Transceiver, modulation integrated circuit, and RFID reader/writer |
| CN101079097A (en) * | 2007-06-14 | 2007-11-28 | 华南理工大学 | Small-sized modular type UHF radio frequency identification read-write equipment |
| CN102456144A (en) * | 2010-10-21 | 2012-05-16 | 上海华虹Nec电子有限公司 | Demodulator circuit of radio frequency identification (RFID) reader |
-
2016
- 2016-11-17 CN CN201611010802.6A patent/CN108073841A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070096878A1 (en) * | 2005-10-31 | 2007-05-03 | Kazushi Yamasaki | Transceiver, modulation integrated circuit, and RFID reader/writer |
| CN101079097A (en) * | 2007-06-14 | 2007-11-28 | 华南理工大学 | Small-sized modular type UHF radio frequency identification read-write equipment |
| CN102456144A (en) * | 2010-10-21 | 2012-05-16 | 上海华虹Nec电子有限公司 | Demodulator circuit of radio frequency identification (RFID) reader |
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| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| CB02 | Change of applicant information |
Address after: 100083 18 floor, West Tower, block D, Tongfang science and Technology Plaza, 1 Wang Zhuang Road, Wudaokou, Haidian District, Beijing. Applicant after: ZIGUANG TONGXIN MICROELECTRONICS CO.,LTD. Address before: 100083 18 floor, West Tower, block D, Tongfang science and Technology Plaza, 1 Wang Zhuang Road, Wudaokou, Haidian District, Beijing. Applicant before: BEIJING TONGFANG MICROELECTRONICS Co.,Ltd. |
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| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20180525 |
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| WD01 | Invention patent application deemed withdrawn after publication |