CN106599746A - Automatic antenna tuning circuit - Google Patents
Automatic antenna tuning circuit Download PDFInfo
- Publication number
- CN106599746A CN106599746A CN201611051003.3A CN201611051003A CN106599746A CN 106599746 A CN106599746 A CN 106599746A CN 201611051003 A CN201611051003 A CN 201611051003A CN 106599746 A CN106599746 A CN 106599746A
- Authority
- CN
- China
- Prior art keywords
- antenna
- automatic tuning
- tuning circuit
- electric capacity
- inductance
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 claims abstract description 28
- 230000005540 biological transmission Effects 0.000 claims description 5
- 230000005611 electricity Effects 0.000 claims description 3
- 230000004048 modification Effects 0.000 claims description 2
- 238000012986 modification Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 8
- 230000035945 sensitivity Effects 0.000 abstract description 4
- 230000003071 parasitic effect Effects 0.000 abstract 1
- 230000032683 aging Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000035882 stress Effects 0.000 description 2
- 238000002955 isolation Methods 0.000 description 1
Classifications
-
- 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
- G06K7/10118—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 the sensing being preceded by at least one preliminary step
- G06K7/10148—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 the sensing being preceded by at least one preliminary step the step consisting of dynamically tuning the resonant circuit of the interrogation device that is emitting the interrogation signal, e.g. for impedance matching inside of the interrogation device
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
- H04B5/70—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes
- H04B5/77—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes for interrogation
Landscapes
- Engineering & Computer Science (AREA)
- Toxicology (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Artificial Intelligence (AREA)
- General Health & Medical Sciences (AREA)
- Electromagnetism (AREA)
- Computer Vision & Pattern Recognition (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Near-Field Transmission Systems (AREA)
Abstract
The invention discloses an automatic antenna tuning circuit applied to a UHF (ultrahigh frequency) RFID (radio frequency identification) reader-writer, and belongs to the field of electronic information. On the basis that the automatic antenna tuning circuit is added between an antenna and the RF transceiver of the ultrahigh frequency RFID reader-writer, a tuning result is discriminated automatically and a control value is set automatically, so that the antenna deviated from a standard matching impedance is tuned back to the standard matching impedance, and the antenna matches the RF transceiver of the UHF RFID reader-writer well. A series of non-ideal factors of the antenna can be inhibited effectively, the UHF RFID reader-writer is avoided from influence of parasitic and inconsistent effects of practical antenna conditions, the sensitivity, reading distance and reliability are improved substantially, and the misreading rate is reduced substantially. When a using environment of the UHF RFID reader-writer changes, the method can be used to return the antenna to the optimal matching state by tuning.
Description
Technical field
The present invention is, with regard to a kind of antenna automatic tuning method suitable for super high frequency radio frequency recognition read-write machine, to belong to electronics
Areas of information technology.
Background technology
Super high frequency radio frequency is recognized（UHF RFID）Read write line is the core physical layer equipment of Internet of Things field, and its performance is direct
Determine reading distance, reliability and the read false rate of UHF RFID tags.UHF rfid interrogators have to connection antenna just can be made
With, there are a series of non-ideal factors yet with antenna, such as characteristic impedance deviate 50 ohm, frequency deviates, standing-wave ratio is higher,
Antenna connection feeder line length is inconsistent, antenna nonuniformity, the nonuniformity of circuit board, the unit of radio frequency input matching network
The ghost effect of device and nonuniformity, etc., this will cause UHF rfid interrogator penalties, have a strong impact on sensitivity,
Distance and reliability are read so as to constrain, read false rate is also greatly increased.Existing certain methods and means, it is impossible to accomplish automatically
Tuning, and UHF rfid interrogators are when specifically used, antenna performance varies, if tuning automatically cannot be realized, then
To be difficult to practical.Therefore, we launch research for this problem, have invented automatic towards the antenna of UHF rfid interrogators
Tuning methods, UHF rfid interrogators can not be affected by the ghost effect under antenna practical situation and nonuniformity effect.
The content of the invention
The invention provides a kind of antenna automatic tuning method suitable for super high frequency radio frequency recognition read-write machine, in additional day
On the basis of line automatic tuning circuit, by judging to tune result automatically and arranging controlling value automatically, realize to antenna input
The automatic tuning capabilities matched somebody with somebody, so that antenna has a series of non-ideal factors, such as 50 ohm of characteristic impedance deviation, frequency is inclined
From, standing-wave ratio, the length of higher, antenna connection feeder line is inconsistent, antenna nonuniformity, the nonuniformity of circuit board, radio frequency are defeated
Enter the components and parts of matching network ghost effect and nonuniformity, etc. factor be inhibited, UHF rfid interrogators can not
Affected by the ghost effect under antenna practical situation and nonuniformity effect, significantly improve sensitivity, read distance, reliability
Property, significantly reduce read false rate.
The above-mentioned purpose of the present invention is achieved by the following technical solutions：
1. as shown in figure 1, " antenna 1 " is connected with the one end of " antenna automatic tuning circuit 2 "；" antenna automatic tuning circuit 2 "
The other end is connected with " radio frequency transceiver 3 "；" antenna automatic tuning method 4 " obtains receiver from " radio frequency transceiver 3 " and receives
The power level information of the antenna-reflected signal for arriving；" antenna automatic tuning method 4 " generation " controlling value " inputs to that " antenna is automatic
Tuning circuit 2 ".
2. as shown in Fig. 2 described " antenna automatic tuning circuit 2 " is by " inductance L1 2a ", " electric capacity C1 2b ", " electricity
Appearance C2 2c ", " inductance L2 2d " four parts composition；Described " inductance L1 2a " one end is connected with " antenna 1 ", the other end with
" " be connected；Described " electric capacity C1 2b " one end is connected with " antenna 1 ", and the other end is connected with " radio frequency transceiver 3 "；Described
" electric capacity C2 2c " one end is connected with " radio frequency transceiver 3 ", the other end with " " be connected；Described " inductance L2 2d " one end with
" radio frequency transceiver 3 " be connected, the other end with " " be connected.
3. as shown in figure 3, described " antenna automatic tuning method 4 " is made up of below scheme order：（1）Antenna is adjusted automatically
Humorous circuit configuration initial " controlling value ", i.e., to the inductance L1 2a in " antenna automatic tuning circuit 2 " ", " electric capacity C1 2b ",
" electric capacity C2 2c ", " inductance L2 2d " give one initial " controlling value "；（2）Selected working frequency points：According to UHF RFID read-writes
The working frequency points that device needs, set the carrier frequency point of transceiver；（3）Transmitter launches the continuous carrier of certain power intensity：
On selected frequency, launch the continuous carrier of certain power intensity, through " antenna automatic tuning circuit 2 " output valve " antenna 1 "
Then launch, because now antenna tuning is not completed, matching between antenna and transceiver is bad, therefore " antenna 1 "
The continuous carrier for reflecting certain power level is back to " radio frequency transceiver 3 " through " antenna automatic tuning circuit 2 "；（4）Connect
The power level of receipts machine exploring antenna transmission signal：Receiver in " radio frequency transceiver 3 " receives the company that antenna-reflected is returned
Continuous carrier wave, and the power level information is determined, and give " antenna automatic tuning method 4 " by the information output；（5）Change antenna
The controlling value of automatic tuning circuit：" antenna automatic tuning method 4 " is according to certain order modification " antenna automatic tuning circuit 2 "
In inductance L1 2a ", " electric capacity C1 2b ", " electric capacity C2 2c ", " controlling value " of " inductance L2 2d "；Then " radio-frequency receiving-transmitting
Receiver in the machine 3 " continuous carrier that still reception antenna is reflected simultaneously determines the power level information, and by the information
Export to " antenna automatic tuning method 4 "；（6）The minimum of antenna-reflected signal power strength：" antenna automatic tuning method
4 " minimum of antenna-reflected signal power strength is selected；（7）Obtain the controlling value of the antenna automatic tuning circuit of optimum：My god
To be antenna automatic for " controlling value " of corresponding " antenna automatic tuning method 4 " during the minimum of line reflection signal power strength
The result of tuning；（8）Antenna automatic tuning is completed：It is complete to the antenna tuning of the working frequency points and the particular transmission power level
Finish, obtain " optimal control value " UHF rfid interrogators after and be operated in the working frequency points and the particular transmission power level
When, only need to be to the inductance L1 2a in " antenna automatic tuning circuit 2 " ", " electric capacity C1 2b ", " electric capacity C2 2c ", " inductance L2
2d " is arranged and is somebody's turn to do " optimal control value "；（9）When the situations for needing to launch certain power intensity to others are tuned automatically
When, repeat the（3）To（8）Step；（10）When needing to tune other situations for organizing frequencies altogether automatically, repeat the
（2）To（8）Step；
4. " controlling value " described in includes following several situations：（1）Digital control position, control discrete variable capacitance or it is discrete can
Become inductance；（2）Analog control signal, can be analog current control signal or analog voltage control signal, control continuous variable
Electric capacity and continuous variable inductance.
Advantages of the present invention
It is an advantage of the current invention that the day of matches criteria port Impedance can automatically will deviate from according to the situation of actual antennas
Line is tuned to matches criteria port Impedance, so that radio frequency transceiver port is directly realized by with antenna match well, so as to
Antenna is inhibited to there are a series of non-ideal factors, such as characteristic impedance deviates 50 ohm, frequency deviates, standing-wave ratio is higher, antenna
Connection feeder line length is inconsistent, antenna nonuniformity, the nonuniformity of circuit board, the components and parts of radio frequency input matching network
Ghost effect and nonuniformity, etc.；When conditions for equipment use changes, such as temperature, humidity, stress, aging generation
During change, the antenna automatic tuning method of the present invention is enabled, can again by antenna tuning to Optimum Matching state, present invention tool
Have the advantage that：
1. isolation between the transmitting-receiving of UHF rfid interrogators is significantly improved；
2. the sensitivity of UHF rfid interrogators is significantly improved；
3. the reading distance of UHF rfid interrogators is significantly improved；
4. the reliability of UHF rfid interrogators is significantly improved；
5. the read false rate of UHF rfid interrogators is significantly reduced；
6. UHF rfid interrogators are significantly improved to poor-performing（Matching is not good）Antenna adaptability, performance still may be used
To maintain high level；
7.UHF rfid interrogators are installing various different antennaes additional（Matching properties are inconsistent）In the case of, suppress non-uniform；
8., when conditions for equipment use changes, such as temperature, humidity, stress, aging when changing enables the day of the present invention
Line automated tuning method, can be again by antenna tuning to Optimum Matching state.
Description of the drawings
Fig. 1：The schematic diagram of antenna automated process；
Fig. 2：A kind of circuit diagram of antenna automatic tuning method；
Fig. 3：The flow chart of antenna automatic tuning method.
Claims (1)
1. a kind of antenna automatic tuning method, its step includes：
" antenna 1 " is connected with the one end of " antenna automatic tuning circuit 2 "；The other end of " antenna automatic tuning circuit 2 " and " radio frequency
Transceiver 3 " is connected；" antenna automatic tuning method 4 " obtains the antenna-reflected letter that receiver is received from " radio frequency transceiver 3 "
Number power level information；" antenna automatic tuning method 4 " generation " controlling value " is inputed to " antenna automatic tuning circuit 2 "；
Described " antenna automatic tuning circuit 2 " is by " inductance L1 2a ", " electric capacity C1 2b ", " electric capacity C2 2c ", " inductance L2
The parts of 2d " four constitute；Described " inductance L1 2a " one end is connected with " antenna 1 ", the other end with " " be connected；Described " electric capacity
C1 2b " one end is connected with " antenna 1 ", and the other end is connected with " radio frequency transceiver 3 "；Described " electric capacity C2 2c " one end with " penetrate
Frequency transceiver 3 " be connected, the other end with " " be connected；Described " inductance L2 2d " one end is connected with " radio frequency transceiver 3 ", another
End with " " be connected；
Described " antenna automatic tuning method 4 " is made up of below scheme order：（1）Antenna automatic tuning circuit configuration is initial
" controlling value ", i.e., to the inductance L1 2a in " antenna automatic tuning circuit 2 " ", " electric capacity C1 2b ", " electric capacity C2 2c ", " electricity
Sense L2 2d " give one initial " controlling value "；（2）Selected working frequency points：According to the work frequency that UHF rfid interrogators need
Point, sets the carrier frequency point of transceiver；（3）Transmitter launches the continuous carrier of certain power intensity：On selected frequency, send out
The continuous carrier of certain power intensity is penetrated, " antenna automatic tuning circuit 2 " output valve " antenna 1 " is passed through and then is launched, by
Do not complete in now antenna tuning, matching between antenna and transceiver is bad, thus " antenna 1 " will to reflect certain power strong
The continuous carrier of degree is back to " radio frequency transceiver 3 " through " antenna automatic tuning circuit 2 "；（4）Receiver exploring antenna is launched
The power level of signal：Receiver in " radio frequency transceiver 3 " receives the continuous carrier that antenna-reflected is returned, and determines this
Power level information, and give " antenna automatic tuning method 4 " by the information output；（5）Change the control of antenna automatic tuning circuit
Value processed：" antenna automatic tuning method 4 " is according to the inductance L1 2a in certain order modification " antenna automatic tuning circuit 2 " ",
" electric capacity C1 2b ", " electric capacity C2 2c ", " controlling value " of " inductance L2 2d "；Then the receiver in " radio frequency transceiver 3 " according to
Continuous carrier that so reception antenna is reflected simultaneously determines the power level information, and by the information output to " antenna is automatic
Tuning methods 4 "；（6）The minimum of antenna-reflected signal power strength：" antenna automatic tuning method 4 " selects antenna-reflected
The minimum of signal power strength；（7）Obtain the controlling value of the antenna automatic tuning circuit of optimum：Antenna-reflected signal power is strong
" controlling value " of corresponding " antenna automatic tuning method 4 " is the result of antenna automatic tuning during the minimum of degree；（8）My god
Automatically tuning is completed line：The antenna tuning of the working frequency points and the particular transmission power level is finished, " optimum control is obtained
When value " UHF rfid interrogators after are operated in the working frequency points and the particular transmission power level, only need to be to " antenna is automatic
Inductance L1 2a in tuning circuit 2 " ", " electric capacity C1 2b ", " electric capacity C2 2c ", " inductance L2 2d " are arranged and are somebody's turn to do " optimum control
Value processed "；（9）When needing to tune the situations of other transmitting certain power intensity automatically, repeat the（3）To
（8）Step；（10）When needing to tune other situations for organizing frequencies altogether automatically, repeat the（2）To（8）Step；
Described " controlling value " includes following several situations：（1）Digital control position, control discrete variable capacitance or discrete variable electricity
Sense；（2）Analog control signal, can be analog current control signal or analog voltage control signal, control continuous variable electric capacity
With continuous variable inductance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611051003.3A CN106599746A (en) | 2016-11-25 | 2016-11-25 | Automatic antenna tuning circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611051003.3A CN106599746A (en) | 2016-11-25 | 2016-11-25 | Automatic antenna tuning circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106599746A true CN106599746A (en) | 2017-04-26 |
Family
ID=58593189
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611051003.3A Pending CN106599746A (en) | 2016-11-25 | 2016-11-25 | Automatic antenna tuning circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106599746A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018095114A1 (en) * | 2016-11-24 | 2018-05-31 | 中兴通讯股份有限公司 | Mobile terminal, method and device for tuning antenna, and storage medium |
| CN110365425A (en) * | 2018-04-09 | 2019-10-22 | 北京展讯高科通信技术有限公司 | Antenna tuning control method, apparatus and system |
| CN110649938A (en) * | 2019-09-25 | 2020-01-03 | 辽宁地质工程职业学院 | Full-band narrow-band Internet of things electric tuning pipeline induction antenna |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1367915A (en) * | 1999-01-12 | 2002-09-04 | 声音工艺公司 | Auto-tuning scanning proximity reader |
| WO2002095870A1 (en) * | 2001-05-24 | 2002-11-28 | Rfwaves Ltd. | A method for designing a small antenna matched to an input impedance, and small antennas designed according to the method |
| CN102498410A (en) * | 2009-09-17 | 2012-06-13 | 皇家飞利浦电子股份有限公司 | Multi-element transmit rf chain with local automatic tune and match device |
| CN103580648A (en) * | 2012-08-09 | 2014-02-12 | 上海宝信软件股份有限公司 | Passive transceiving common-frequency RFID system with triaxial closed-loop self-tuning function |
| CN103858341A (en) * | 2011-08-08 | 2014-06-11 | Lg伊诺特有限公司 | Impedance matching apparatus |
-
2016
- 2016-11-25 CN CN201611051003.3A patent/CN106599746A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1367915A (en) * | 1999-01-12 | 2002-09-04 | 声音工艺公司 | Auto-tuning scanning proximity reader |
| WO2002095870A1 (en) * | 2001-05-24 | 2002-11-28 | Rfwaves Ltd. | A method for designing a small antenna matched to an input impedance, and small antennas designed according to the method |
| CN102498410A (en) * | 2009-09-17 | 2012-06-13 | 皇家飞利浦电子股份有限公司 | Multi-element transmit rf chain with local automatic tune and match device |
| CN103858341A (en) * | 2011-08-08 | 2014-06-11 | Lg伊诺特有限公司 | Impedance matching apparatus |
| CN103580648A (en) * | 2012-08-09 | 2014-02-12 | 上海宝信软件股份有限公司 | Passive transceiving common-frequency RFID system with triaxial closed-loop self-tuning function |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018095114A1 (en) * | 2016-11-24 | 2018-05-31 | 中兴通讯股份有限公司 | Mobile terminal, method and device for tuning antenna, and storage medium |
| CN110365425A (en) * | 2018-04-09 | 2019-10-22 | 北京展讯高科通信技术有限公司 | Antenna tuning control method, apparatus and system |
| CN110365425B (en) * | 2018-04-09 | 2021-10-26 | 北京紫光展锐通信技术有限公司 | Antenna tuning control method, device and system |
| CN110649938A (en) * | 2019-09-25 | 2020-01-03 | 辽宁地质工程职业学院 | Full-band narrow-band Internet of things electric tuning pipeline induction antenna |
| CN110649938B (en) * | 2019-09-25 | 2024-02-27 | 辽宁地质工程职业学院 | Full-band narrowband internet of things electric tuning pipeline induction antenna |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US6946958B2 (en) | Contactless data storage medium | |
| US9419675B2 (en) | Isolation tuners for directional couplers | |
| CN103020562B (en) | Ultrahigh frequency radio frequency identification device (RFID) self-adaptive antenna impedance matching method | |
| US20100304701A1 (en) | Apparatus and method for removing transmission leakage signal | |
| KR100996104B1 (en) | Apparatus and method for improving reception sensitivity of portable RDF | |
| CN106470040B (en) | Dual band transmitter | |
| US9698871B2 (en) | Near field communications apparatus | |
| CN106599746A (en) | Automatic antenna tuning circuit | |
| Shahmohammadi et al. | High-Q, over-coupled tuning for near-field RFID systems | |
| CN102194138A (en) | Interrogator | |
| US10867227B2 (en) | Method and apparatus for passive remote control | |
| Lee et al. | Passive tag for multi-carrier RFID systems | |
| CN105471449A (en) | Antenna circuit for near-field antennas | |
| US9680443B2 (en) | Apparatus and method for operating at least two antennas for a motor vehicle, and near-field communication network | |
| JP5548075B2 (en) | Communication output setting device | |
| JP4336379B2 (en) | RFID carrier sense method and RFID system using the same | |
| CN109583252A (en) | A kind of carrier cancellation circuit and RFID reader | |
| CN103235962B (en) | A kind of elimination launches the super high frequency electronic label read/write disturbed | |
| US9520902B2 (en) | Reader and RFID reader | |
| CN111178103B (en) | Method and system for eliminating carrier wave of ultrahigh frequency RFID reader-writer | |
| US10536176B1 (en) | Dynamic antenna matching system and method | |
| Zhao | Analysis of dead zone by mathematical methods | |
| Dieng et al. | Study of adaptive tuning strategies for near field communication (nfc) transmitter module | |
| CN216750296U (en) | Near field communication antenna and near field communication intelligence lock | |
| CN104617976B (en) | RFID (radio frequency identification device) front-end self-adaptive unit and control method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information |
Address after: 313100 Zhejiang province Huzhou city Changxing County Taihu street high railway 669 1 building 314 room Applicant after: Zhejiang core technology Co., Ltd. Address before: 313100 Zhejiang province Huzhou city Changxing County Taihu street high railway 669 1 building 314 room Applicant before: Changxin core technology Co., Ltd. |
|
| CB02 | Change of applicant information | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20170426 |
|
| WD01 | Invention patent application deemed withdrawn after publication |