CN106599946A - Automatic antenna tuning circuit for of RF transceiver - Google Patents
Automatic antenna tuning circuit for of RF transceiver Download PDFInfo
- Publication number
- CN106599946A CN106599946A CN201611051301.2A CN201611051301A CN106599946A CN 106599946 A CN106599946 A CN 106599946A CN 201611051301 A CN201611051301 A CN 201611051301A CN 106599946 A CN106599946 A CN 106599946A
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- CN
- China
- Prior art keywords
- antenna
- inductance
- tuning circuit
- radio frequency
- electric capacity
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- 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.)
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Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K17/00—Methods or arrangements for effecting co-operative working between equipments covered by two or more of main groups G06K1/00 - G06K15/00, e.g. automatic card files incorporating conveying and reading operations
- G06K17/0003—Automatic card files incorporating selecting, conveying and possibly reading and/or writing operations
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K17/00—Methods or arrangements for effecting co-operative working between equipments covered by two or more of main groups G06K1/00 - G06K15/00, e.g. automatic card files incorporating conveying and reading operations
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Details Of Aerials (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. The automatic antenna tuning circuit is added between an antenna and the RF transceiver of the ultrahigh frequency RFID reader-writer, the antenna deviated from a standard matching impedance is tuned back to the standard matching impedance, and thus, the antenna matches the RF transceiver of the UHF RFID reader-writer well; and 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.
Description
Technical field
The present invention is, with regard to a kind of antenna automatic tuning circuit 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.Therefore, we launch research for this problem, send out
Understand the antenna automatic tuning circuit engineering towards UHF rfid interrogators, UHF rfid interrogators can not receive the actual feelings of antenna
The impact of ghost effect and nonuniformity effect under condition.
The content of the invention
The invention provides a kind of antenna automatic tuning circuit suitable for super high frequency radio frequency recognition read-write machine, by additional
Antenna automatic tuning circuit realiration to antenna be input into matching automatic tuning capabilities so that there are a series of unreasonablys in antenna
Think factor, such as characteristic impedance deviates 50 ohm, frequency deviates, standing-wave ratio is higher, the length of antenna connection feeder line is inconsistent, antenna
Nonuniformity, the nonuniformity of circuit board, the ghost effect of the components and parts of radio frequency input matching network and nonuniformity, etc.
Factor is inhibited, and UHF rfid interrogators can not receive the shadow of the ghost effect under antenna practical situation and nonuniformity effect
Ring, significantly improve sensitivity, read distance, reliability, 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 ".
2. as shown in Fig. 2 described " antenna automatic tuning circuit 2 " is by " inductance L1 2a ", " electric capacity C1 2b ", " electric capacity
C2 2c ", " inductance L2 2d " four parts composition；Described " inductance L1 2a " one end is connected with " antenna 1 ", the other end with " "
It is 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 is with " radio frequency is received
Send out machine 3 " be connected, the other end with " " be connected.
3. as shown in figure 3, described " antenna automatic tuning circuit 2 " also can be formed by following connected mode：Described " electricity
One end is connected sense L1 2a " with " antenna 1 ", the other end with " " be connected；Described " electric capacity C2 2c " one end and " antenna 1 " phase
Even, the other end with " " be connected；Described " electric capacity C1 2b " one end is connected with " antenna 1 ", the other end and " radio frequency transceiver 3 "
It is connected；Described " inductance L2 2d " one end is connected with " radio frequency transceiver 3 ", the other end with " " be connected.
4. " the electric capacity C1 2b " and " electric capacity C1 2b " described in is variable capacitance, and its capacitance is variable；It can be capacitance
Continually varying variable capacitance, or the variable capacitance of capacitance Discrete Change.
5. " the inductance L1 2a " and " inductance L2 2d " described in can be fixed inductance, or variable inductance；Typically
In the case of be fixed inductance；Then can be inductance value continually varying variable inductance if variable inductance, or inductance value is discrete
The variable inductance of change.
Advantages of the present invention
It is an advantage of the current invention that by the antenna automatic tuning circuit, the antenna of matches criteria port Impedance can be will deviate from
Matches criteria port Impedance is tuned to, so that radio frequency transceiver port is directly realized by with antenna match well, so as to press down
Antenna is made and there are a series of non-ideal factors, such as characteristic impedance has deviateed 50 ohm, frequency deviates, standing-wave ratio is higher, antenna connects
The length that connects feeder line is inconsistent, antenna nonuniformity, the nonuniformity of circuit board, the components and parts of radio frequency input matching network
Ghost effect and nonuniformity, etc..The present invention towards UHF rfid interrogators, there is an advantage in 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.
Description of the drawings
Fig. 1：The schematic diagram of antenna automatic tuning circuit；
Fig. 2：A kind of circuit diagram of antenna automatic tuning circuit；
Fig. 3：The circuit diagram of another kind of antenna automatic tuning circuit.
Claims (1)
1. radio frequency transceiver antenna automatic tuning circuit, 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；
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 circuit 2 " also can be formed by following connected mode：Described " inductance L1 2a " one end with
" antenna 1 " be connected, the other end with " " be connected；Described " electric capacity C2 2c " one end is connected with " antenna 1 ", the other end with " "
It is 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 " inductance
L2 2d " one end is connected with " radio frequency transceiver 3 ", the other end with " " be connected；
Described " electric capacity C1 2b " and " electric capacity C1 2b " is variable capacitance, and its capacitance is variable；Can be that capacitance continuously becomes
The variable capacitance of change, or the variable capacitance of capacitance Discrete Change；
Described " inductance L1 2a " and " inductance L2 2d " can be fixed inductance, or variable inductance；Generally
For fixed inductance；Then can be inductance value continually varying variable inductance if variable inductance, or inductance value Discrete Change
Variable inductance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611051301.2A CN106599946A (en) | 2016-11-25 | 2016-11-25 | Automatic antenna tuning circuit for of RF transceiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611051301.2A CN106599946A (en) | 2016-11-25 | 2016-11-25 | Automatic antenna tuning circuit for of RF transceiver |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106599946A true CN106599946A (en) | 2017-04-26 |
Family
ID=58593218
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611051301.2A Pending CN106599946A (en) | 2016-11-25 | 2016-11-25 | Automatic antenna tuning circuit for of RF transceiver |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106599946A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100265003A1 (en) * | 2009-04-17 | 2010-10-21 | Epcos Ag | Impedance matching method |
| CN102077416A (en) * | 2008-06-25 | 2011-05-25 | 诺基亚公司 | An antenna arrangement |
| CN103858341A (en) * | 2011-08-08 | 2014-06-11 | Lg伊诺特有限公司 | Impedance matching apparatus |
| TW201528607A (en) * | 2014-01-15 | 2015-07-16 | Wistron Neweb Corp | Wireless communication device and method of adjusting antenna matching |
-
2016
- 2016-11-25 CN CN201611051301.2A patent/CN106599946A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102077416A (en) * | 2008-06-25 | 2011-05-25 | 诺基亚公司 | An antenna arrangement |
| US20100265003A1 (en) * | 2009-04-17 | 2010-10-21 | Epcos Ag | Impedance matching method |
| CN103858341A (en) * | 2011-08-08 | 2014-06-11 | Lg伊诺特有限公司 | Impedance matching apparatus |
| TW201528607A (en) * | 2014-01-15 | 2015-07-16 | Wistron Neweb Corp | Wireless communication device and method of adjusting antenna matching |
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| 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 | ||
| 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. |
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| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20170426 |