CN102163299A - Electronic tag for motor vehicle inspection qualified mark - Google Patents

Abstract

The invention relates to an electronic tag for a motor vehicle inspection qualified mark. The electronic tag for the motor vehicle inspection qualified mark is characterized by comprising the motor vehicle inspection qualified mark, a tag antenna and a chip, wherein the tag antenna and the chip and integrally connected and fixed on the back face of the motor vehicle inspection qualified mark. The invention has the advantages that: the electronic tag suitable for the motor vehicle inspection qualified mark is designed by the motor vehicle inspection qualified mark, an unique electronic license plate which cannot be counterfeited is provided for a motor vehicle, and the counterfeit license plate using condition of the motor vehicle can be effectively monitored and managed.

Description

The motor vehicle sign electronic tag that is up to the standards

Technical field

The present invention is a kind of ultrahigh frequency (UHF) radio-frequency (RF) identification (RFID) technology, be specifically related to a kind of motor vehicle sign electronic tag that is up to the standards, it is inner that it is that label antenna (Tag antenna) is made in the motor vehicle sign that is up to the standards, realization is especially overlapped a kind of effective solution of board phenomenon to the management of motor vehicles to motor vehicles.

Background technology

At present, motor vehicles covers board has become social phenomenon, the great harmful effect that the people's daily life is caused.Tracing it to its cause is, the anti-counterfeiting mark that can not change number (ID) that the motor vehicles neither one is unique.Current to motor vehicles covers board way to solve the problem mainly still based on artificial and utilize image recognition technology, thereby but can not effectively check identification number and pairing vehicle with these methods and can not judge motor vehicles and whether used the cover board.UHF RFID technology is one and utilizes radiofrequency signal to realize that by electromagnetic field remote contactless information transmission and the information of passing through to be transmitted reach the technology of identifying purpose.UHF RFID technology is the cover board phenomenon of controller motor vehicle effectively.

Summary of the invention

In order effectively to solve motor vehicles cover board problem, the purpose of this invention is to provide a kind of motor vehicle sign electronic tag that is up to the standards, it utilizes UHF RFID technology, and label antenna and the motor vehicle sign that is up to the standards is combined.Utilize reader (Reader) to obtain being stored in the motor vehicles of label chip inside and car owner's information comprises car plate, car model and driver license number etc., license plate information in conjunction with the Automobile registration that obtains with image recognition technology compares, and can effectively solve motor vehicles cover board problem.

The technical solution adopted for the present invention to solve the technical problems is: a kind of motor vehicle sign electronic tag that is up to the standards, it comprises motor vehicle be up to the standards sign, label antenna, chip, label antenna be fixed on the be up to the standards back side of sign of motor vehicle after chip is connected one.

Motor vehicle is up to the standards and indicates electronic tag, reader and middleware composition ultrahigh-frequency radio-frequency identification system, and reader is connected with middleware, and motor vehicle is up to the standards and indicates that electronic tag is that communication is connected with reader.Middleware is a kind of independently system software or service routine, can connect the software of two or more stand-alone utilities or autonomous system, the system that is connected, even they have different interfaces, but each other still can exchange message by middleware.Principle of work is: under the communication protocol of arranging mutually, utilize Principles of Radar, reader sends signal, and label antenna receives electromagnetic wave and activates label chip, and then label chip returns to reader by label antenna with reader institute information requested.The electronic tag that this energy that sends by reader activates label chip is called passive label.Passive electronic label generally is made up of antenna and label chip, utilizes reader or other electronic equipments to carry out read-write operation to the chip of label antenna, deposits motor vehicles and car owner's relevant confidence in chip internal.

Patent electric label antenna of the present invention is considered the shape and size that motor vehicle is up to the standards and indicates, for making full use of the space, improve the gain of label antenna, above-mentioned label antenna is the antenna of necktie knot (Bow-Tie) form, and do not adopt the antenna of folding line form commonly used (Mender Line), such structure has avoided in the folding line structural antenna because the energy offset that current reversal brings, thereby can cause antenna gain to reduce.In addition, carry out Antenna Design in conjunction with fractal theory (Fractal Theory).Fractal theory is the very fashionable and active new theory in the world today, new subject.Fractal notion is that American mathematician Man Debu rood (B.B.Mandelbort) at first proposes.Utilize fractal theory to carry out the size that Antenna Design can effectively reduce antenna ^{[1] [2]}, utilize the antenna of necktie junction structure can effectively design under the prerequisite that guarantees antenna gain in conjunction with fractal theory, satisfy the antenna of dimensional requirement.In addition, motor vehicle is up to the standards and indicates that the label chip that electronic tag adopts is the up-to-date RFID label chip G2IL of Philips NXP, and the receiving sensitivity of chip can reach-18dBm, and lower receiving sensitivity can make the reading distance of label far away more.Adopt T structure matching (T-Match) technology between label antenna and the label chip ^{[3] [4]}, can make between label and the antenna to reach conjugate impedance match, thereby the power transfer coefficient τ between label antenna and the chip is reached more than 95%.The two ends of the antenna of necktie knot (Bow-Tie) form are provided with the tri-angle-holed of hollow out, to reduce antenna size.

The electromagnetic wave energy of the need of work reader of passive label activates, and the reading distance that this has limited the work of passive label UHF rfid system generally can reach more than 10 meters farthest.Maximum reading distance can be provided by formula:

$R=\frac{\mathrm{\λ}}{4\mathrm{\π}}\sqrt{\frac{\mathrm{EIRP}\×G_{\mathrm{tag}}\×p\×\mathrm{\τ}}{P_{\mathrm{th}}}}$

λ is a wavelength, and EIRP is an effective isotropic radiated power, G _TagBe the gain of label antenna, the p matching attribute that polarizes, τ is the power transfer coefficient, P _ThFor the label antenna chip is opened power.

This uses novel designed electronic label antenna gain to be G _Tag=2.07dB, the label antenna chip is opened power P _Th=-18dBm, power transfer coefficient τ=0.95, reader antenna is a circular polarisation, the polarization matching attribute is p=0.5, EIRP=36dBm, then maximum reading distance calculates and can get with above-mentioned formula when 915MHz: R _Max=11.4m.

Motor vehicle be up to the standards the sign inside do label antenna, with motor vehicle be up to the standards the sign be affixed on motor vehicles front windshield upper right side, can manage and monitor motor vehicles in conjunction with the monitor network that becomes with video camera cloth with reader.Reader can obtain the information of label antenna chip internal, and the information on the motor vehicles consumption board that obtains with video camera is compared, and can obtain motor vehicles and whether use the cover board.

The invention has the beneficial effects as follows: utilize the motor vehicle sign that is up to the standards, design and be fit to the electronic tag that motor vehicle is up to the standards and indicates, for motor vehicles provide unique " electronic license plate " that can not copy, can effectively monitor and manage the cover the cards one holds condition of motor vehicles.

Description of drawings

The present invention is further described below in conjunction with drawings and Examples.

Fig. 1 is the principle of work synoptic diagram of mobile management system.

Fig. 2 is folding line label antenna direction of current figure.

Fig. 3 is a kind of be up to the standards electronic tag of signage applications of motor vehicle that is suitable for.

Fig. 4 is the strength of current of fractal Bow-Tie structure label antenna.

Fig. 5 is fractal Bow-Tie structure label antenna power transfer coefficient τ simulation result.

Table 1 is that folding line label antenna and fractal Bow-Tie structure label antenna radiation efficiency simulation result compare.

Fig. 6 is the be up to the standards front view (FV) of sign electronic tag embodiment of motor vehicle.

Fig. 7 is the longitudinal profile structural map of Fig. 2.

Embodiment

Fig. 1 is the principle of work block diagram of mobile management system.Have motor vehicle be up to the standards the sign motor vehicles enter setting regions after, reader and motor vehicle are up to the standards and indicate that electronic tag communicates, obtain after motor vehicles and car owner's the relevant information data screening by middleware and filtration and deliver to background computer and handle, and then give in the LAN (Local Area Network) or be published to Internet.

Fig. 2 is the label antenna synoptic diagram that adopts folding line (Mender Line) technology to realize.Adopt the folding line technology can the time label antenna size dwindle greatly, the size of label antenna shown in Figure 2 is in (2.5cm*4.5cm), but the performance of label antenna variation to some extent.The direction of arrow is represented direction of current on the label antenna, and visible direction of current is cancelled out each other thereby make these electric currents produce the radiation field direction mutually on the contrary owing to the cause of folding line presents opposite direction, thereby reduces the radiation efficiency of antenna.

Fig. 3 has provided a kind of electronic tag that motor vehicle is up to the standards and indicates that is suitable for.Electronic tag is made up of chip and antenna two parts, and the design of antenna fully takes into account the applied environment of label reality, as the influence of glass to it.Label chip adopts the label chip of Philips NXP, and concrete model is G2IL.Whole electronic tag is of a size of 5.5cm*5.5cm, less than motor vehicle be up to the standards the sign size (75 ± 0.5) mm * (75 ± 0.5) mm, the cross cutting radius of corner is 5mm ± 0.1mm), thereby this electronic tag can be fabricated into be up to the standards sign the inside of motor vehicle, label antenna combines with fractal theory and Bow-Tie structure and realizes, fractal theory makes the theoretical value (18cm) of the size of entire antenna much smaller than half-wave dipole antenna, and adopts the Bow-Tie structure to guarantee that the gain of label antenna is more than 2dB.Fig. 4 has provided the strength of current distribution plan of fractal Bow-Tie structure label antenna.

The emulation radiation efficiency that table 1 has provided the label antenna that adopts folding line technology and fractal Bow-Tie structure compares.Adopt the label antenna of folding line technology as can be seen because direction of current causes radiation efficiency to reduce greatly mutually on the contrary, use the radiation efficiency of label antenna of fractal Bow-Tie structure then quite high.

Fig. 5 is the power transfer coefficient simulation result of fractal Bow-Tie structure label antenna.The power transfer coefficient has reflected the degree of impedance matching between label antenna and the chip.Mate good more power transfer coefficient and approach 1 more.Can know that from Fig. 5 coupling is fairly good between fractal Bow-Tie structure label antenna and the chip, the ability transfer efficiency is more than 98%.

Fig. 6 has provided the front view (FV) that is attached to motor vehicle annual test sign electronic tag embodiment.The label antenna motor vehicle is up to the standards and indicates inside, Fig. 7 has provided the sectional view of Fig. 3, the motor vehicle sign electronic tag that is up to the standards is made up of three parts: motor vehicle be up to the standards sign, label antenna and substrate, label antenna is between motor vehicle annual test sign and substrate, and the motor vehicle sign electronic marker motor vehicle sign that is up to the standards that is up to the standards directly is attached to above the front windshield of motor vehicle.

Claims (3)

1. motor vehicle sign electronic tag that is up to the standards is characterized in that: comprise motor vehicle be up to the standards sign, label antenna, chip, label antenna be fixed on the be up to the standards back side of sign of motor vehicle after chip is connected one.

2. the motor vehicle according to claim 1 sign electronic tag that is up to the standards, it is characterized in that: motor vehicle is up to the standards and indicates electronic tag, reader and middleware composition ultrahigh-frequency radio-frequency identification system, reader is connected with middleware, and motor vehicle is up to the standards and indicates that electronic tag is that communication is connected with reader.

3. the motor vehicle according to claim 1 sign electronic tag that is up to the standards, it is characterized in that: label antenna is the antenna of necktie knot (Bow-Tie) form, the two ends of the antenna of necktie knot (Bow-Tie) form are provided with the tri-angle-holed of hollow out, to reduce antenna size.

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