CN104156759B - A kind of double antenna passive ultrahigh frequency electronic tag chip - Google Patents
A kind of double antenna passive ultrahigh frequency electronic tag chip Download PDFInfo
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- CN104156759B CN104156759B CN201410349044.5A CN201410349044A CN104156759B CN 104156759 B CN104156759 B CN 104156759B CN 201410349044 A CN201410349044 A CN 201410349044A CN 104156759 B CN104156759 B CN 104156759B
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Abstract
A kind of double antenna passive ultrahigh frequency electronic tag chip, label antenna including dual-port label chip, two cross polarizations, two label antennas are connected with two pairs of ports of label chip respectively, and two-way rectification circuit, two-way demodulator circuit and two-way modulation circuit are included inside dual-port label chip；Each of which antenna connects rectification circuit, all the way modulation circuit and demodulator circuit all the way all the way respectively, the output of two-way rectifier is directly connected to while being powered for label chip, detection obtains envelope signal to two-way demodulator circuit respectively, and judge that the signal which antenna is received is strong by comparing its DC value, so as to produce antenna selection signals, antenna selection signals receive the strong signal all the way of signal by being selected with door, and are sent to digital baseband；Antenna selection signals by carrying out signal modulation with door come the strong modulator all the way of selection signal, and by this all the way antenna modulated signal backscattering is gone back.The present invention improves the communication distance and communication quality of label chip.
Description
Technical field
The invention belongs to field of radio frequency identification, and in particular to a kind of double antenna passive ultrahigh frequency electronic tag chip.
Background technology
With flourishing for Internet of Things, radio frequency identification (RFID) technology has obtained substantial amounts of application.Wherein, passive superelevation
Frequently (UHF RFID) electronic label chip has big accuracy height, amount of storage, repeatable utilization, non-contact read-write, recognizable height
Fast moving object, identification code is unique, the advantages of can recognize multiple identification objects simultaneously, with boundless application market.
REID is that a kind of utilization radiofrequency signal realizes contactless by the electromagnetic coupled of electromagnetic wave in space
Information communication, and pass through a kind of technology that transmitted information reaches automatic identification purpose.
Electronic tag, as the carrier of identification information, is an indispensable part in radio-frequency recognition system.According to whetheing there is
Battery can be divided into it is active, it is semi-active, passive three kinds, low frequency (LF, 125KHz, 134KHz), high frequency can be divided into according to working frequency
(HF, 13.56MHz), hyperfrequency (UHF, 433MHz, 860MHz~960MHz) and microwave (MW, 2.45GHz, 5.8GHz) frequency range.
Passive UHF RFID label tags operating distance is remote, so it is operated in the far field that reader launches electromagnetic field, label
Energy transmission between reader is based on wireless power transfer model.
Signal communication between passive UHF RFID label tags and reader is to be based on backscatter technique, i.e., read by reflection
The part energy of device transmission is read to realize the communication of signal.
However, prior art has the following disadvantages：
Existing passive UHF RFIDs mainly use single antenna and double antenna two ways, single antenna pattern by
The influence of antenna polarization and directionality, shortens the operating distance of label, and the double antenna pattern used at present, is mainly used in increasing
Tag reception energy, only using single antenna progress signal communication, this still limit to a certain extent the communication of label away from
From.
The content of the invention
The present invention is directed to above-mentioned the deficiencies in the prior art, proposes a kind of double antenna passive ultrahigh frequency electronic tag chip, with
Improve the communication distance and communication quality of label.
To achieve the above object, the technical solution adopted by the present invention is as follows：
A kind of double antenna passive ultrahigh frequency electronic tag chip, including dual-port label chip, the mark of two cross polarizations
Antenna is signed, two label antennas are connected with two pairs of ports of label chip respectively, two-way are included inside dual-port label chip whole
Current circuit, two-way demodulator circuit and two-way modulation circuit；Each of which antenna connect respectively all the way rectification circuit, modulate all the way
Circuit and all the way demodulator circuit, two-way rectifier output are directly connected to while being powered for label chip, and two-way demodulator circuit is distinguished
Detection obtains envelope signal, and judges that the signal which antenna is received is strong by comparing its DC value, so as to produce a day line selection
Signal is selected, antenna selection signals receive the strong signal all the way of signal by being selected with door, and are sent to digital baseband；Antenna
Selection signal by carrying out signal modulation with door come the strong modulator all the way of selection signal, and by this all the way antenna will modulate and believe
Number backscattering is gone back.When implementing, double antenna can with single-ended connection can also difference connect.
In the present invention：The energy that RF energy is received in two-way antenna is converted into directly by described two-way rectification circuit respectively
Stream energy；Described two-way demodulator circuit will demodulate modulated signal from the brewed radiofrequency signal that antenna is received respectively；Institute
The two-way modulation circuit stated can receive the data of digital baseband return, and be modulated signals into by way of backscattering.
The feature of the mode of operation of described label chip is：Its internal two-way rectification circuit works always, and by energy
Powered in the same storage capacitor of amount injection for label chip.
The feature of the mode of operation of described label chip is：Compare the envelope signal that two-way demodulator circuit detection is obtained
DC values judge the power of the reception signal of antenna, produce an antenna selection signals, antenna selection signals control is only by signal
Strong demodulated signal all the way is transferred to digital baseband, at the same control modulated signal also by this all the way antenna send.
The beneficial effect of technical solution of the present invention：
Described label chip adds label using double antenna and receives energy；Label chip automatic decision antenna receives letter
Number power, so as to only add communication distance, and avoid two-way antenna using the strong modulation-demodulation signal all the way of signal
The crosstalk that sending signal is brought is received simultaneously, improves communication quality.
Brief description of the drawings
Fig. 1 is the double antenna label chip antenna connection diagram of the present invention.
Fig. 2 is double antenna label chip internal structure schematic diagram of the invention.
Fig. 3 is double antenna working state schematic representation of the invention.
Embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with the accompanying drawings to the specific reality of the present invention
Apply example to be described in detail, but be not construed as limiting the invention.
The present invention proposes a kind of double antenna passive ultrahigh frequency electronic tag chip, including dual-port label chip, two
The label antenna of cross polarization, two label antennas are connected with two pairs of ports of label chip respectively, in dual-port label chip
Portion includes two-way rectification circuit, two-way demodulator circuit and two-way modulation circuit.Wherein, dual demodulators will be received from double antenna
Radiofrequency signal is demodulated respectively to be come, and the DC signal amplitudes of the envelope signal obtained by comparison detection receive come automatic decision antenna
The power of signal, is only transferred to digital baseband by the strong demodulated signal all the way of signal, while also only being used when modulating return signal
The strong antenna all the way of signal is sent, it is to avoid two-way antenna receives the crosstalk that sending signal is brought simultaneously.So both improved logical
Communication distance, in turn ensure that communication quality.
With reference to Fig. 1, double antenna passive ultrahigh frequency electronic tag chip proposed by the present invention includes：Dual-port label chip,
The label antenna of two cross polarizations；Two label antennas respectively with label chip two to port connection (101,102,103,
104)。
When implementing, double antenna can with single-ended connection can also difference connect, present example is without limitation.
With reference to Fig. 2, include inside dual-port label chip：Two-way rectification circuit, two-way demodulator circuit, two-way modulation electricity
Road；Each of which antenna (antenna 1, antenna 2) connects rectification all the way, modulation, demodulator circuit respectively；The output of two-way rectifier is straight
Connect in succession while being powered for label chip；The DC for the envelope signal (201,202) that two-way demodulator circuit is obtained by comparison detection
Value (203,204) is strong come the reception signal for judging which antenna, produces antenna selection signals (207)；Antenna selection signals lead to
Cross with door to select to receive the strong signal all the way of signal, and be sent to digital baseband；Meanwhile, antenna selection signals by with door
Carry out the strong modulator all the way of selection signal and carry out signal modulation, and by this all the way antenna by modulated signal (205,206) reversely
Scattering is gone back；
In order to avoid two-way aerial signal difference very little makes the unstable situation of antenna selection signals, in signal modulation process
In, digital baseband, which sends control signal, makes antenna selection signals not retransmit change.When implementing, present example to this not
It is limited.
With reference to Fig. 3, a kind of specific works state during inventive antenna work is represented.Label is when receiving signal, two-way
The DC signals (303,304) that demodulator is produced compare, if the signal of antenna 1 is strong, comparing obtained antenna selection signals (307) is
" 1 ", only has the signal (301) after the demodulation of antenna 1 to be just transferred to digital baseband after NAND gate；When sending data, numeral
Control signal (308) make antenna selection signals (307) keep it is constant, two-way modulated signal (305,306) by with behind the door, only
Modulated signal (305) is sent using antenna 1；Dotted line represents that signal is not transmitted.
When implementing, present example is not limited to the communication protocol of radio-frequency recognition system, reader.
When implementing, present example can be dipole antenna, and present example is without limitation.
In summary, the invention provides a kind of double antenna UHF electronic for being used to improve operating distance and communication quality
Label chip, it improves signal receiving strength while improving and receiving energy, so as to improve label chip communication distance, separately
Outside, it avoids double antenna while receiving and sending the signal cross-talk problem of data band, improves label and receives communication quality.
Therefore, the present invention can promote the application of passive ultrahigh frequency electronic tag chip, have a tremendous social and economic benefits.
The foregoing is only an example of the present invention, be not intended to limit the present invention, it is all the spirit and principles in the present invention it
Any modification that is interior, being made, equivalent, improve etc., it should be included within the scope of the present invention.
Claims (4)
1. a kind of double antenna passive ultrahigh frequency electronic tag chip, it is characterised in that including dual-port label chip, two it is orthogonal
The label antenna of polarization, two label antennas are connected with two pairs of ports of label chip respectively, are wrapped inside dual-port label chip
Include two-way rectification circuit, two-way demodulator circuit and two-way modulation circuit；Each of which antenna connect respectively all the way rectification circuit,
Modulation circuit and all the way demodulator circuit all the way, two-way rectifier output are directly connected to while being powered for label chip, and two-way is demodulated
Detection obtains envelope signal to circuit respectively, and judges that the signal which antenna is received is strong by comparing its DC value, so as to produce
Raw antenna selection signals, antenna selection signals receive the strong signal all the way of signal by being selected with door, and are sent to numeral
Base band；Antenna selection signals are and strong by signal by carrying out signal modulation with door come the strong modulator all the way of selection signal
This all the way antenna modulated signal backscattering is gone back, during signal modulation, digital baseband send control signal make antenna
Selection signal no longer changes.
2. a kind of double antenna passive ultrahigh frequency electronic tag chip according to claim 1, it is characterised in that two antennas
Using single-ended connection or difference connection.
3. a kind of double antenna passive ultrahigh frequency electronic tag chip according to claim 1 or 2, it is characterised in that described
Two-way rectification circuit respectively by two-way antenna receive RF energy energy be converted into DC energy；Described two-way demodulation
Circuit will demodulate modulated signal from the brewed radiofrequency signal that antenna is received respectively；Described two-way modulation circuit can connect
The data that digital baseband is returned are received, and are modulated signals into by way of backscattering.
4. a kind of double antenna passive ultrahigh frequency electronic tag chip according to claim 3, it is characterised in that dual-port mark
Two-way rectification circuit in label chip works always, and will be powered in the same storage capacitor of energy injection for label chip.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410349044.5A CN104156759B (en) | 2014-07-22 | 2014-07-22 | A kind of double antenna passive ultrahigh frequency electronic tag chip |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410349044.5A CN104156759B (en) | 2014-07-22 | 2014-07-22 | A kind of double antenna passive ultrahigh frequency electronic tag chip |
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| CN104156759B true CN104156759B (en) | 2017-07-14 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102622645A (en) * | 2012-03-31 | 2012-08-01 | 电子科技大学 | Radio frequency front end of radio frequency identification (RFID) electronic tag |
| CN102810180A (en) * | 2012-07-04 | 2012-12-05 | 广州中大微电子有限公司 | ASK (Amplitude Shift Keying) demodulation circuit with wide demodulation range used for passive RFID (Radio Frequency Identification) label chips |
| CN103218651A (en) * | 2013-03-19 | 2013-07-24 | 天津工业大学 | Intelligent double-antenna ultra high frequency (UHF) radio frequency identification device (RFID) |
-
2014
- 2014-07-22 CN CN201410349044.5A patent/CN104156759B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102622645A (en) * | 2012-03-31 | 2012-08-01 | 电子科技大学 | Radio frequency front end of radio frequency identification (RFID) electronic tag |
| CN102810180A (en) * | 2012-07-04 | 2012-12-05 | 广州中大微电子有限公司 | ASK (Amplitude Shift Keying) demodulation circuit with wide demodulation range used for passive RFID (Radio Frequency Identification) label chips |
| CN103218651A (en) * | 2013-03-19 | 2013-07-24 | 天津工业大学 | Intelligent double-antenna ultra high frequency (UHF) radio frequency identification device (RFID) |
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| CN104156759A (en) | 2014-11-19 |
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