CN104617976B - RFID (radio frequency identification device) front-end self-adaptive unit and control method thereof - Google Patents
RFID (radio frequency identification device) front-end self-adaptive unit and control method thereof Download PDFInfo
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Abstract
The invention refers to the technical field of an RFID (radio frequency identification device), and particularly discloses an RFID front-end self-adaptive unit and a control method thereof. The RFID front-end self-adaptive unit and the control method thereof are researched for solving low sensitivity of an RFID communication system for the RFID communication system is lack of effective switching measures to receive and transmitting an antenna in the prior art. The RFID front-end self-adaptive unit includes a central control unit, an emitting unit, a receiving unit, a receive-transmit switching unit and an antenna unit; the central control unit, the emitting unit, the receive-transmit switching unit and the antenna unit are electrically connected in order; the receiving unit is electrically connected with the central control unit and linked with the emitting unit in parallel; the RFID front-end self-adaptive unit is characterized by further comprising a GPIO (general purpose input/output ) control amending unit and a matching amending unit, wherein one end of the GPIO control amending unit is connected with the central control unit, and the other end thereof is connected with the matching amending unit; the matching amending unit is connected to the middle of the receive-transmit switching unit and the antenna unit in series; besides, the RFID front-end self-adaptive unit further comprises a reflective power detecting unit, wherein one end of the reflective power detecting unit is connected with the central control unit while the other end is connected with the receive-transmit switching unit.
Description
Technical field
The present invention relates to technical field of RFID, be specially a kind of RFID front end adaptive unit and controlling party thereof
Method.
Background technology
The RFID communication system of currently available technology is as shown in Figure 1: include middle control unit (also known as base band
Processing unit), transmitter unit (also known as RF processing unit), receive unit (also known as RF processing unit),
TRx switching unit and antenna element.Described middle control unit, transmitter unit, TRx switching unit and antenna list
Unit is sequentially connected in series, and described reception unit is connected with middle control unit, and in parallel with transmitter unit.
It is single that described middle control unit is responsible for modulation /demodulation and the protocol analysis of signal, described transmitter unit and reception
Unit is responsible for digital signal moving and analog-modulated to high-frequency signal, and described TRx switching unit is responsible for reception
Isolation with transmitting path and switching, described antenna element is responsible for and connecing signal from circuit board to space radiation
Receive.
RFID antenna, as the key link in whole RFID communication system, has very important effect in fact,
First antenna carries the power function being transported in place more efficiently, and secondly antenna should reduce
Launch the reflection that power causes due to mismatch in antenna end, this shows to go out from performance and power consumption angle
Sending out, the good antenna of matching is extremely important for whole RFID communication system.
At present RFID integrator is the most mechanical antenna and card reader is connected together for major part, does not consider
The performance loss wherein caused due to mismatch so that the efficiency of whole system reduces.
In sum, the RFID communication system of currently available technology lacks effective switching measure make antenna transmitting-receiving
Obtain RFID communication breath system sensitivity relatively low.
Summary of the invention
The present invention is directed to above technical problem provide a kind of by for RFID antenna provide effective switching measure from
And improve RFID front end adaptive unit and the control method thereof of RFID susceptiveness.
In order to achieve the above object, the technical scheme is that a kind of RFID front end adaptive unit,
Including middle control unit, transmitter unit, reception unit, TRx switching unit and antenna element, described middle control is single
Unit, transmitter unit, TRx switching unit and antenna element are sequentially connected electrically, and described reception unit is single with middle control
Unit's electrical connection is the most in parallel with transmitter unit, also includes that GPIO controls amending unit and coupling amending unit, institute
The one end stating GPIO control amending unit is connected with middle control unit, and the other end is connected with coupling amending unit,
Described coupling amending unit is serially connected between TRx switching unit and antenna element, also includes that reflection power detects
Unit, one end of described reflection power detector unit is connected with middle control unit, the other end and TRx switching unit
Connect.
Can be seen that according to such scheme and present invention have the advantage that this design is first in transmitting-receiving switching
Unit rear end, adds a road power detecting unit, the watt level that detection reflects, by and launch
The contrast of power, calculates the mismatch condition of port, thus prevents in use, and the change of environment is made
Become antenna related parameters change, by regulate front end coupling, can efficiently against this problem,
By using this RFID leading portion adaptive unit, can reading to whole RFID read-write system from many aspects
Write performance carries out bigger lifting.
1, by this adaptive technique of front end, can more effectively the output power consumption of system be transferred to
Antenna end, thus add the Energy distribution of whole radiation field, for passive RFID tags, it is read
Write distance and also have certain lifting.
2, for whole rfid system, by this adaptive technique, whole RFID mould can be made
Block always works in its optimized state.
3, for RFID module receptivity, this leading portion adaptive technique can effectively optimize penetrates
Frequently the VSWR of leading portion, and then reduce the power reflection interference of transmitting chain, thus the connecing of lifting means effectively
Receive sensitivity.
4., for the power consumption characteristics of RFID module, its adaptive technique can optimize PA's from rear end
Loadpull, is that the duty of PA is optimised so that it is be operated in best efficiency point and maximum power point
Between, thus reduce the output power consumption of whole module.
5., for the antenna for RFID module introduces, adaptive technique can effectively adapt to various external
The mismatch impact that antenna is caused when connecting, by adaptive regulation technology so that module is for external sky
The adaptability of line is enhanced.
6., by this RFID leading portion adaptive unit, the robustness of system can be strengthened so that whole
Rfid system is more stable, solves the rfid system dependency for environment to a certain extent.
As preferably, described Adaptive matching unit uses fet structure IC to constitute；
As improvement, described Adaptive matching unit uses diode to constitute with capacitor and inductor combination；
As preferably, described reflection power detector unit is power detection device；
As preferably, described reflection power detector unit is detection tube；
As preferably, described reflection power detector unit is inspection pressure pipe；
The control program developing optimum for the RFID front end adaptive unit of this structure is as follows:
The control method of a kind of RFID front end adaptive unit, comprises the steps:
Step one: original state, i.e. power detecting unit, the watt level that reflects of detection, by with
Launch the contrast of power, calculate the mismatch condition of port；
Step 2: preferred condition, controls different parameters by GPIO output, adjusts coupling respectively and revises
Unit, reflection power and the ratio receiving power in the case of recording every kind；
Step 3: parameter adjustment, middle control unit records various data respectively, and chooses reflection and launch power
The minima of ratio is optimal result；
Step 4: optimum state, when reflection and transmitting power ratio；
The minima various data when being optimal result carry out recording and pass through GPIO output control by transmitter unit,
The parameter receiving unit, TRx switching unit and antenna element is adjusted to optimum state.
Can be seen that according to such scheme and present invention have the advantage that this process is all by middle control unit
Operate, control different parameters by GPIO output, adjust coupling amending unit respectively, record every
Reflection power and the ratio of reception power in the case of Zhong, middle control unit records various data respectively, and chooses anti-
The minima penetrated and launch power ratio is optimal result.
Accompanying drawing explanation
Accompanying drawing 1 is the connection block diagram of the RFID communication system of prior art.
Accompanying drawing 2 is the connection block diagram of the RFID front end adaptive unit of the present invention.
Accompanying drawing 3 is the flow chart of the control method of the RFID front end adaptive unit of the present invention.
S11 Parameter Map under the different parameters that accompanying drawing 4 is the present invention is obtained by Adaptive matching.
VSWR Parameter Map under the different parameters that accompanying drawing 5 is the present invention is obtained by Adaptive matching.
Detailed description of the invention
With embodiment, the present invention is further described below in conjunction with the accompanying drawings.
A kind of RFID front end adaptive unit, including middle control unit, transmitter unit, reception unit, transmitting-receiving
Switch unit and antenna element, described middle control unit, transmitter unit, TRx switching unit and antenna element depend on
Secondary electrical connection, described reception unit electrically connects and in parallel with transmitter unit with middle control unit, it is characterised in that:
Also include GPIO control amending unit and coupling amending unit, described GPIO control amending unit one end with
Middle control unit connects, and the other end is connected with coupling amending unit, and described coupling amending unit is serially connected in transmitting-receiving and cuts
Change between unit and antenna element, also include reflection power detector unit, described reflection power detector unit
One end is connected with middle control unit, and the other end is connected with TRx switching unit；Described Adaptive matching unit uses
Fet structure IC is constituted or diode is constituted with capacitor and inductor combination；Described reflection power detector unit is
Power detection device or detection tube or inspection pressure pipe.
The service behaviour of rfid system is improved so that the robust of rfid system by the adaptive technique of front end
Property is enhanced, and improves the popularization adaptability of rfid system, promotes that it popularizes.
By the adaptive technique of leading portion, the power consumption of RFID module is made to be minimized, simultaneously its readwrite performance
It is optimised.
The control program developing optimum for the RFID front end adaptive unit of this structure is as follows:
The control method of a kind of RFID front end adaptive unit, comprises the steps:
Step one: original state, i.e. power detecting unit, the watt level that reflects of detection, by with
Launch the contrast of power, calculate the mismatch condition of port；
Step 2: preferred condition, controls different parameters by GPIO output, adjusts coupling respectively and revises
Unit, reflection power and the ratio receiving power in the case of recording every kind；
Step 3: parameter adjustment, middle control unit records various data respectively, and chooses reflection and launch power
The minima of ratio is optimal result；
Step 4: optimum state, when reflection and transmitting power ratio；
The minima various data when being optimal result carry out recording and pass through GPIO output control by transmitter unit,
The parameter receiving unit, TRx switching unit and antenna element is adjusted to optimum state.
First, the robustness of rfid system, be suitable for the application of different scenes；Secondly, the adaptation of RFID device
Property, secondly, permissible from transmitting terminal it is suitable for the transplanting in distinct device, improves emission effciency, reduce mismatch
The extra power consumption caused；Secondly, permissible from transmitting terminal, improve emission effciency, that reduces that mismatch causes is extra
Power consumption；Again, mated by front end, it is possible to reduce insertion loss, improve transmitting range；Finally, pass through
Front end is mated, and can effectively reduce reflection, improves receiving range.
It is understood that above with respect to the specific descriptions of the present invention, be merely to illustrate the present invention and be not subject to
It is limited to the technical scheme described by the embodiment of the present invention, it will be understood by those within the art that, still
The present invention can be modified or equivalent, to reach identical technique effect；Need are used as long as meeting
Want, all within protection scope of the present invention.
Claims (7)
1. a RFID front end adaptive unit, cuts including middle control unit, transmitter unit, reception unit, transmitting-receiving
Changing unit and antenna element, described middle control unit, transmitter unit, TRx switching unit and antenna element are successively
Electrical connection, described reception unit electrically connects and in parallel with transmitter unit with middle control unit, it is characterised in that: also
Including GPIO control amending unit and coupling amending unit, described GPIO control amending unit one end with in
Control unit connects, and the other end is connected with coupling amending unit, and described coupling amending unit is serially connected in transmitting-receiving switching
Between unit and antenna element, also include reflection power detector unit, the one of described reflection power detector unit
End is connected with middle control unit, and the other end is connected with TRx switching unit.
RFID front end the most according to claim 1 adaptive unit, it is characterised in that: described RFID front end
Adaptive unit uses fet structure IC to constitute.
RFID front end the most according to claim 1 adaptive unit, it is characterised in that: described RFID front end
Adaptive unit uses diode to constitute with capacitor and inductor combination.
RFID front end the most according to claim 1 adaptive unit, it is characterised in that: described reflection power
Detector unit is power detection device.
RFID front end the most according to claim 1 adaptive unit, it is characterised in that: described reflection power
Detector unit is detection tube.
RFID front end the most according to claim 1 adaptive unit, it is characterised in that: described reflection power
Detector unit is inspection pressure pipe.
7. the control method of a RFID front end adaptive unit, it is characterised in that: comprise the steps:
Step one: original state, i.e. power detecting unit, the watt level that reflects of detection, by and launch
The contrast of power, calculates the mismatch condition of port；
Step 2: Optimal State, controls different parameters by GPIO output, adjusts coupling amending unit respectively,
Reflection power and the ratio receiving power in the case of recording every kind；
Step 3: parameter adjustment, middle control unit records various data respectively, and chooses reflection and launch power ratio
Minima is optimal result；
Step 4: optimum state, the various data when the minima of reflection with transmitting power ratio is optimal result are entered
Row record is also controlled transmitter unit by GPIO output, is received unit, TRx switching unit and antenna element
Parameter be adjusted to optimum state.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009294953A (en) * | 2008-06-05 | 2009-12-17 | Hitachi Ltd | Rfid thread, sheet with rfid thread and printing machine for sheet with rfid thread |
| CN101873149A (en) * | 2010-06-28 | 2010-10-27 | 深圳市桑达无线通讯技术有限公司 | High-power radio frequency system and radio frequency transmission method |
| CN204408333U (en) * | 2014-12-30 | 2015-06-17 | 无锡识凌科技有限公司 | RFID front end adaptive unit |
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| JP4530494B2 (en) * | 2000-06-30 | 2010-08-25 | 三菱電機株式会社 | High frequency composite elements |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009294953A (en) * | 2008-06-05 | 2009-12-17 | Hitachi Ltd | Rfid thread, sheet with rfid thread and printing machine for sheet with rfid thread |
| CN101873149A (en) * | 2010-06-28 | 2010-10-27 | 深圳市桑达无线通讯技术有限公司 | High-power radio frequency system and radio frequency transmission method |
| CN204408333U (en) * | 2014-12-30 | 2015-06-17 | 无锡识凌科技有限公司 | RFID front end adaptive unit |
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Denomination of invention: RFID (radio frequency identification device) front-end self-adaptive unit and control method thereof Effective date of registration: 20171024 Granted publication date: 20170111 Pledgee: Bank of Suzhou, Limited by Share Ltd, Wuxi branch Pledgor: Wuxi Shiling Technology Co., Ltd. Registration number: 2017320010071 |
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Date of cancellation: 20181206 Granted publication date: 20170111 Pledgee: Bank of Suzhou, Limited by Share Ltd, Wuxi branch Pledgor: Wuxi Shiling Technology Co., Ltd. Registration number: 2017320010071 |
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Denomination of invention: RFID (radio frequency identification device) front-end self-adaptive unit and control method thereof Effective date of registration: 20181219 Granted publication date: 20170111 Pledgee: Bank of Suzhou, Limited by Share Ltd, Wuxi branch Pledgor: Wuxi Shiling Technology Co., Ltd. Registration number: 2018320010052 |
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Date of cancellation: 20200421 Granted publication date: 20170111 Pledgee: Bank of Suzhou, Limited by Share Ltd, Wuxi branch Pledgor: WUXI SHILING TECHNOLOGY Co.,Ltd. Registration number: 2018320010052 |