CN203870643U - RFID reader-writer for self-test and self-adjustment of transmit power - Google Patents
RFID reader-writer for self-test and self-adjustment of transmit power Download PDFInfo
- Publication number
- CN203870643U CN203870643U CN201420311165.6U CN201420311165U CN203870643U CN 203870643 U CN203870643 U CN 203870643U CN 201420311165 U CN201420311165 U CN 201420311165U CN 203870643 U CN203870643 U CN 203870643U
- Authority
- CN
- China
- Prior art keywords
- power
- self
- control module
- band control
- rfid interrogator
- 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.)
- Withdrawn - After Issue
Links
- 230000003321 amplification Effects 0.000 claims abstract description 6
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 6
- 238000002955 isolation Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 description 7
- 230000008878 coupling Effects 0.000 description 5
- 238000010168 coupling process Methods 0.000 description 5
- 238000005859 coupling reaction Methods 0.000 description 5
- 238000001514 detection method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 239000003570 air Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 230000005670 electromagnetic radiation Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Abstract
The utility model discloses a RFID reader-writer for self-test and self-adjustment of transmit power. The RFID reader-writer contains a base-band control module, a radio frequency module, a power amplifier, an isolation coupler, a Pi-type attenuator circuit and a power detector which are successively connected and form a loop, wherein the power detector is connected with an ADC port of the base-band control module; and the base-band control module is also connected with a control switch for multi-stage power amplification of the power amplifier. According to the utility model, a ultrahigh frequency RFID reader-writer for self-test and self-adjustment of transmit power is brought forward, and the problem that transmit power is higher than a threshold value to generate thermal loss and an electronic tag cannot be read due to signal distortion or underpower is avoided. The ultrahigh frequency RFID reader-writer is generally suitable for multiple application environments and can be applied widely.
Description
Technical field
The utility model relates to REID field, is specifically related to one emissive power is carried out from detecting and self-regulating rfid interrogator.
Background technology
The automatic recognition system that radio-frequency (RF) identification (RFID) system is made up of radio-frequency (RF) tag, read write line and computer network.Conventionally, read write line forms electromagnetic field at a region emitted energy, and radio-frequency (RF) tag sends the data of storing in label after the signal of read write line being detected during through this region, and read write line receives the signal that radio-frequency (RF) tag sends, decoding is the accuracy of checking data also, reaches the object of identification.Common rfid interrogator inner structure as shown in Figure 1.
In ultrahigh-frequency radio-frequency identification system, the signal transmitting chain of ultrahigh frequency radio frequency identification (RFID) reader is the important component part of system, the stability, recognition distance and the accuracy that directly affect radio-frequency recognition system, electronic tag is also not quite similar to the requirement of the lower read write line emissive power size of different physical environments (metal, water, air etc.).The emissive power meeting less than normal of read write line causes reducing the problem such as recognition distance and recognition accuracy; The emissive power meeting bigger than normal of read write line causes the problems such as the waste, stability reduction, electromagnetic radiation of distortion, the power consumption of signal.
Current rfid interrogator generally adopts fixed transmission power and carries out the mode of manual adjustments in client.The former is generally Custom Prosthesis read write line, cannot be applicable to extensive occasion.The latter needs artificial manual operation, user's correlation technique is had relatively high expectations, and system cannot from detect and self-regulation emissive power with raising system performance.
Utility model content
The utility model object is, overcomes the defect in prior art, proposes a kind of ultrahigh frequency radio frequency identification (RFID) reader, wherein for the transmitting chain of ultrahigh frequency radio frequency identification (RFID) reader, solves current ultrahigh frequency radio frequency identification (RFID) reader emissive power deficiency or the too high problem of emissive power.
For realizing above-mentioned utility model object, the technical solution adopted in the utility model is: provide a kind of emissive power is carried out from detecting and self-regulating rfid interrogator, it is characterized in that, described rfid interrogator comprises the base band control module, radio-frequency module, power amplifier, isolating coupler, π type attenuator circuit and the power detector that connect and form successively loop, wherein power detector is connected with the ADC port of base band control module, and base band control module is also connected with the gauge tap of the multistage power amplification of power amplifier.
Wherein preferred technical scheme is on described isolating coupler, to be also connected with antenna, for the transmitting-receiving of signal.
Further preferred technical scheme, described isolating coupler also arrives radio-frequency module by low-pass filter circuit by signal feedback.
Preferred technical scheme also has, and is two-way connection between described base band control module and radio-frequency module.
Preferred technical scheme also has, and described rfid interrogator is ultrahigh frequency radio frequency identification (RFID) reader, and its frequency is 860MHz～960MHz.
Advantage of the present utility model and beneficial effect are: this carries out detection certainly and self-regulating rfid interrogator and rfid interrogator to emissive power emissive power is carried out from detecting and method for self regulating, proposed to carry out from detecting and self-regulating ultrahigh frequency radio frequency identification (RFID) reader emissive power, avoid emissive power exceed threshold value generation thermal losses and distorted signals or underpower cannot reading electronic labels etc. problem.The base band control module of read write line can detect and regulate according to the DC voltage value receiving from power detector the emissive power of rfid interrogator automatically.Meanwhile, between isolating coupler and power detector, add one
πtype attenuator circuit, by the power input decay 10dB of power detector, effectively prevents the too high damage power detector of emissive power of rfid interrogator.This ultrahigh frequency RFID read-write is generally applicable to, in multiple applied environment, can be widely used.
Brief description of the drawings
Fig. 1 is the inner structure schematic block diagram of existing rfid interrogator;
Fig. 2 is that the utility model carries out the inner structure schematic block diagram from detection and self-regulating rfid interrogator to emissive power;
Fig. 3 is that rfid interrogator carries out the process flow diagram from detection and self-adjusting method to emissive power.
In figure: 1-base band control module, 1.1-ADC port, 2-radio-frequency module, 3-power amplifier, 3.1-gauge tap, 4-isolating coupler, 5-π type attenuator circuit, 6-power detector, 7-antenna, 8-low-pass filter circuit.
Embodiment
As shown in Figure 2,3, the utility model is that one is carried out from detecting and self-regulating rfid interrogator emissive power, this rfid interrogator comprises the base band control module 1, radio-frequency module 2, power amplifier 3, isolating coupler 4, π type attenuator circuit 5 and the power detector 6 that connect and form successively loop, wherein power detector 6 is connected with the ADC port one .1 of base band control module 1, and base band control module 1 is also connected with the gauge tap 3.1 of the multistage power amplification of power amplifier 3.
In the utility model, preferred embodiment is on described isolating coupler 4, to be also connected with antenna 7, for the transmitting-receiving of signal.
Further preferred embodiment in the utility model, described isolating coupler 4 also arrives radio-frequency module 2 by low-pass filter circuit 8 by signal feedback.
In the utility model, preferred embodiment also has, and is two-way connection between described base band control module and 1 radio-frequency module 2.
In the utility model, preferred embodiment also has, and described rfid interrogator is ultrahigh frequency radio frequency identification (RFID) reader, and its frequency is 860MHz～960MHz.
For realizing above-mentioned utility model object, another technical scheme that the utility model adopts is: provide a kind of rfid interrogator to carry out from detecting and method for self regulating emissive power, described method comprises the steps:
The first step: will produce emissive power P in the time of radio-frequency module 2 emitting radio frequency signal
c, isolating coupler 4 by coupled end by this power P
ctransfer to power detector 6;
Second step: add one between isolating coupler 4 and power detector 6
πtype attenuator circuit 5, by the decay of π type attenuator circuit 5, by emissive power P
creduce 10dB, for preventing the power P of isolating coupler 4 output terminals
cexcessively cause damaging power detector;
The 3rd step: power detector 6 receives the power P through overdamping
c' after, produce a DC voltage V in inside
dC;
The 4th step: power detector 6 is by the DC voltage V producing
dCaDC port one .1 by base band control module 1 transfers in base band control module 1, and judges V in base band control module 1
dCsize whether within threshold value, calculate the current emissive power of radio-frequency module 2 by following formula;
P
in＝P
v+P
c’+10dB+Coupling(dB)
In formula: P
inthe power of launching for radio-frequency module 2; P
vthe power receiving for power detector 6; The power that 10dB attenuates while being signal process π type attenuator circuit 5; Coupling (dB) is the degree of coupling of isolating coupler 4;
The 5th step: after the power and threshold of launching by the radio-frequency module 2 collecting, base band control module 1 changes the emissive power of rfid interrogator automatically to reach from detecting and self-regulating object.
In the utility model, preferred embodiment is, the DC voltage V of described the 3rd step
dCfor the power P with receiving
c' be dull voltage, work as P
c' rise time, V
dCalso along with corresponding rising; Work as P
c' decline time, V
dCalso along with corresponding decline.
Embodiment 1
As shown in Figure 2, the utility model one is carried out from detecting and self-regulating rfid interrogator emissive power, by base band control module 1, radio-frequency module 2, power amplifier 3, isolating coupler 4,
πtype attenuator circuit 5 and power detector 6 form, described base band control module 1, radio-frequency module 2, power amplifier 3, isolating coupler 4, π type attenuator circuit 5, power detector 6 connect successively and form loop, the output terminal of described power detector 6 is connected with the ADC port of base band control module 1, and base band control module 1 is connected with the multistage amplification bias voltage switch 3.1 of power amplifier 3.
Isolating coupler 4 is not the circulator that ultrahigh frequency radio frequency identification (RFID) reader generally uses, but there is the isolating coupler 4 of coupling function, this isolating coupler 4 not only can prevent from transmitting and receiving interfering with each other of signal, and can produce in coupled end the difference of an emissive power and the degree of coupling, can calculate the emissive power of rfid interrogator by this difference, in the utility model, this difference is transferred to power detector 6.
The passive electric circuit that π type attenuator circuit 5 is made up of resistance; its effect is that the signal power of isolating coupler 4 coupled end outputs is decayed; reach the effect of protection power detector 6, the power calculation that in attenuator circuit, the concrete numerical value of resistance is decayed by needs obtains.
What the input end of power detector 6 obtained is the signal through overdamping, produces a DC voltage V according to the signal power of input
dC, and this voltage V
dCwith input signal power be dull.The physical relationship of power detector 6 voltages and power is different and different because of device.
The ADC port of base band control module 1 receives the DC voltage V that power detector 6 produces
dCafter calculate in inside and compare with the threshold value of emissive power, automatically change the number of stages of amplification of external power amplifier 3 according to result relatively.
So far, embodiment of the present utility model has completed emissive power is carried out from detecting and self-regulating object to ultrahigh frequency radio frequency identification (RFID) reader.
The utility model is not limited to above-mentioned embodiment, those skilled in the art make to any apparent improvement of above-mentioned embodiment or change, can not exceed the protection domain of design of the present utility model and claims.
Claims (5)
1. one kind is carried out from detecting and self-regulating rfid interrogator emissive power, it is characterized in that, described rfid interrogator comprises the base band control module, radio-frequency module, power amplifier, isolating coupler, π type attenuator circuit and the power detector that connect and form successively loop, wherein power detector is connected with the ADC port of base band control module, and base band control module is also connected with the gauge tap of the multistage power amplification of power amplifier.
As claimed in claim 1 to emissive power carry out from detect and self-regulating rfid interrogator, it is characterized in that, on described isolating coupler, be also connected with antenna, for the transmitting-receiving of signal.
As claimed in claim 2 to emissive power carry out from detect and self-regulating rfid interrogator, it is characterized in that, described isolating coupler also by low-pass filter circuit by signal feedback arrive radio-frequency module.
As claimed in claim 1 to emissive power carry out from detect and self-regulating rfid interrogator, it is characterized in that, between described base band control module and radio-frequency module be two-way connection.
As claimed in claim 1 to emissive power carry out from detect and self-regulating rfid interrogator, it is characterized in that, described rfid interrogator is ultrahigh frequency radio frequency identification (RFID) reader, its frequency is 860MHz～960MHz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420311165.6U CN203870643U (en) | 2014-06-12 | 2014-06-12 | RFID reader-writer for self-test and self-adjustment of transmit power |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420311165.6U CN203870643U (en) | 2014-06-12 | 2014-06-12 | RFID reader-writer for self-test and self-adjustment of transmit power |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203870643U true CN203870643U (en) | 2014-10-08 |
Family
ID=51651572
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420311165.6U Withdrawn - After Issue CN203870643U (en) | 2014-06-12 | 2014-06-12 | RFID reader-writer for self-test and self-adjustment of transmit power |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203870643U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104036305A (en) * | 2014-06-12 | 2014-09-10 | 公安部第一研究所 | RFID reader-writer and method for carrying out self-detection and self-adjustment on transmitting power |
| CN110728338A (en) * | 2019-09-26 | 2020-01-24 | 北京智博晟源科技有限公司 | RFID reader-writer system and power calibration method |
-
2014
- 2014-06-12 CN CN201420311165.6U patent/CN203870643U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104036305A (en) * | 2014-06-12 | 2014-09-10 | 公安部第一研究所 | RFID reader-writer and method for carrying out self-detection and self-adjustment on transmitting power |
| CN104036305B (en) * | 2014-06-12 | 2017-05-10 | 公安部第一研究所 | RFID reader-writer and method for carrying out self-detection and self-adjustment on transmitting power |
| CN110728338A (en) * | 2019-09-26 | 2020-01-24 | 北京智博晟源科技有限公司 | RFID reader-writer system and power calibration method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103297157B (en) | A kind of antenna detection method of many antennas super high frequency electronic label read/write | |
| CN201892966U (en) | Intelligent temperature sensing tag | |
| CN103020562A (en) | Ultrahigh frequency radio frequency identification device (RFID) self-adaptive antenna impedance matching method | |
| CN104008415A (en) | Self-interference canceling circuit | |
| CN103020675A (en) | Ultrahigh-frequency RFID (radio frequency identification device) reading and writing module based on self-adaptive tuning technology of antenna | |
| CN103226720A (en) | Carrier cancellation method for ultra-high frequency electronic tag reader-writer | |
| CN104008414A (en) | High-receiving-sensitivity passive RFID system with optical link connection | |
| CN203870643U (en) | RFID reader-writer for self-test and self-adjustment of transmit power | |
| CN104036305A (en) | RFID reader-writer and method for carrying out self-detection and self-adjustment on transmitting power | |
| CN104732254B (en) | Radio-frequency identification reader/writer | |
| CN105553502A (en) | Shortwave radio and transmission protection method thereof | |
| CN102346869A (en) | Ultrahigh-frequency sensor tag chip | |
| CN201594278U (en) | Radio frequency label with controllable read and write | |
| CN101655925B (en) | Close coupling radio frequency identification devices (RFID) tag and control method thereof | |
| CN101685492A (en) | RFID communication model air interface parameter testing method | |
| CN104008409A (en) | Optical link for connecting antenna with reader-writer in passive RFID system | |
| CN106709388A (en) | Reader-writer power calibration device and calibration method | |
| CN101833434B (en) | CMOS (Complementary Metal Oxide Semiconductor) random number generator | |
| CN104850812B (en) | A kind of energy-conservation card reading circuit of radio-frequency card, method and system | |
| CN204859121U (en) | Solid -state pulse power amplifier of S wave band 40W | |
| CN204408333U (en) | RFID front end adaptive unit | |
| CN103235962A (en) | Ultrahigh frequency electronic tag reader-writer capable of eliminating transmitting interference | |
| CN102256018A (en) | Mobile phone with integrated RFID (Radio Frequency Identification) function and communication method thereof | |
| CN201859463U (en) | UHF (ultra high frequency) RFID (radiofrequency identification device) antenna extension device | |
| CN204759434U (en) | Radio -frequency card read card circuit and card system and radio frequency access control system are read to radio -frequency card |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20141008 Effective date of abandoning: 20170510 |