CN202748821U - Double-layer structure anti metal radio frequency identification electronic label - Google Patents

Abstract

The present utility model discloses a double-layer structure anti metal radio frequency identification electronic label. tinsel is covered on the surface of a lower layer coupling medium substrate, tinsel of the upper and lower surfaces are communicated, the tinsel of the upper surface is provided with a coupling seam with set width; an upper layer antenna medium substrate is piled up above the middle part of the lower layer coupling medium substrate, a label antenna is arranged on the upper surface of the upper layer antenna medium substrate, the label antenna is connected with a radio frequency identification chip, and the radio frequency identification chip is arranged above the coupling seam. The electronic label has the following advantages, surface effects of the metal are reduced, electric field attenuation of the label on the metal surface is avoided; the label antenna is conjugated and matched with the label chip through wing-shaped structures of the two sides; the center frequency of the label on the UHF frequency range can be changed through adjusting the width of the coupling seam, thus an optimal reading distance can be realized when the label is attached to different materials. The electronic label is not only suitable to be pasted on metal materials, but also suitable to be used in other special materials.

Description

The anti-metallic RF identification of a kind of double-decker electronic tag

Technical field

The utility model relates to radio-frequency (RF) identification (RFID) label, relates in particular to a kind of electronic tag with anti-metal function.

Background technology

At present, electronic label technology has been widely used in the aspects such as logistics field, asset management, cargo tracking.Under many specific environments, label also there has been special requirement.Because electronic tag is the class dipole, when being applied to the metal surface, the metal boundary condition can cause the off resonance of Antenna Impedance Matching and the reduction of radiation efficiency, and final impact is to the identification of electronic tag.

The utility model content

In order to overcome the deficiencies in the prior art, the utility model discloses the anti-metallic RF identification of a kind of double-decker electronic tag.

The utility model has adopted following technical scheme:

The anti-metallic RF identification of a kind of double-decker electronic tag comprises lower floor's couplant substrate, upper strata antenna medium substrates, label antenna, radio-frequency (RF) identification chip;

Lower floor's couplant substrate upper and lower surface all is coated with metal forming, and the metal forming of upper and lower surface links, and the metal forming of upper surface leaves the coupling slot of setting width, and namely herein lower floor's couplant substrate exposes;

The upper strata antenna medium substrates overlays lower floor's couplant substrate top center, and label antenna is located at upper strata antenna medium substrates upper surface, and label antenna is connected with radio-frequency (RF) identification chip, radio-frequency (RF) identification chip be positioned at coupling slot directly over.

Preferably, described metal forming is aluminium foil.

Preferably, described lower floor couplant substrate, upper strata antenna medium substrates all are rectangle, and easy to process, profile is also attractive in appearance.

Described label antenna mainly obtains electromagnetic energy by the coupling of lower floor's couplant substrate, upper strata antenna medium substrates thickness has determined the stiffness of coupling of label antenna and lower floor's couplant substrate, the top dielectric plate thickness whenever reduces 0.1mm tag hub frequency to the not enough 1MHz of high frequency offset, the label transfer efficiency can descend to some extent, but label gain and efficient increase obviously, can be by regulating upper strata antenna medium substrates thickness, material, the label that reads distance of design; Described label top dielectric plate is selected low-loss material, and different materials is larger to label gain and effectiveness affects; But upper strata antenna medium substrates shape is little on the tag performance impact;

The reading distance formula of described label is

Wherein λ is operation wavelength, P _tBe the reader antenna emissive power, Be the gain of reader antenna,

Be label antenna gain, P _ThFor activating the required minimum power of RFID chip, p is polarization match factor, and τ is the tag energy transmission coefficient, and the tag energy transmission coefficient is presented as that the electromagnetic energy that label antenna receives is absorbed by the RFID chip, and the transmission coefficient formula is:

$\mathrm{\τ}=\frac{4*\mathrm{Re}\left(Z_e\right)*\mathrm{Re}\left(Z_a\right)}{{[\mathrm{Re}\left(Z_a\right)+\mathrm{Re}\left(Z_c\right)]}^2+{[\mathrm{Im}\left(Z_a\right)-\mathrm{Im}\left(Z_c\right)]}^2},$ 0≤τ≤1

The polarization matching formula is: $p=\frac{{{\mathrm{\ρ}}_1}^2{{\mathrm{\ρ}}_2}^2+2{\mathrm{\ρ}}_1{\mathrm{\ρ}}_2\cos ({\mathrm{\θ}}_1-{\mathrm{\θ}}_2)}{(1+{{\mathrm{\ρ}}_1}^2)(1+{{\mathrm{\ρ}}_2}^2)},$ 0≤p≤1

Wherein, Re (Z _c), Im (Z _c) be respectively real part and the imaginary part of label chip impedance, Re (Z _a), Im (Z _a) be respectively real part and the imaginary part of label antenna input impedance;

Preferably, described lower floor couplant substrate is low-loss material, further, is engineering plastics, and is with low cost.

The width of coupling slot is used for adjusting the centre frequency of label, and the variable of every 1mm can affect about centre frequency 10MHz.

Preferably, described label antenna is little band metal antenna, and it is two symmetrical lateral wing type fine strip shape structures, middle radio-frequency (RF) identification chip, label antenna and the radio-frequency (RF) identification chip impedance conjugate impedance match of connecting; Strip slice and both sides shaped form wing affect antenna impedance, and the width of airfoil structure is slightly influential to impedance; Little band metal antenna and radio-frequency (RF) identification chip can substitute with inlay, reduce cost, but effect descend to some extent;

Preferably, the perpendicular direction of described label antenna direction and coupling slot.

Preferably, the anti-metallic RF identification of described double-decker electronic tag also is provided with plastic casing, to prevent the water infiltration and to prevent mechanical impact that shell can be selected the PC plastics, PP plastics, the nonmetallic materials such as ABS material; When the anti-metallic RF identification of double-decker electronic tag is established shell, the drift of tag hub Frequency generated, the coupling slot width on the capable of regulating label layer dielectric substrate is adjusted centre frequency.

The utility model has the advantage of: (1) adopts double-layer structure, and lower floor is low-loss material, and with the metal material parcel, is used for and the label antenna coupling, has reduced the metallic surface effect, avoids along with the nearlyer field decay in tag distances metal surface is larger; In addition, label antenna is regulated antenna impedance by the both sides airfoil structure, makes it and the label chip conjugate impedance match.(2) the coupling slot width changes label in the centre frequency of uhf band on lower floor's couplant plate by regulating, thereby realizes reaching when label is attached on the different materials distance that reads of the best.Therefore, the utility model is not only applicable to label and is attached on the metal material, can be used on other special materials yet.

Description of drawings

Fig. 1 is the structural representation of cut-open view of the present utility model;

Fig. 2 is the structural representation of vertical view of the present utility model;

Fig. 3 is the synoptic diagram that reads distance of the utility model embodiment;

Fig. 4 is the synoptic diagram of the reading angular of the utility model embodiment;

Number in the figure: 1-lower floor couplant substrate, 2-upper strata antenna medium substrates, 3-aluminium foil, 4-label antenna, 5-radio-frequency (RF) identification chip, 6-coupling slot.

Embodiment

The utility model is described in further detail below in conjunction with drawings and Examples:

As shown in Figure 1 and Figure 2, the anti-metallic RF identification of a kind of double-decker electronic tag comprises rectangle lower floor couplant substrate 1, rectangle upper strata antenna medium substrates 2, label antenna 4, radio-frequency (RF) identification chip 5;

Lower floor's couplant substrate upper and lower surface all is coated with aluminium foil 3, and the aluminium foil of upper and lower surface links, and the aluminium foil of upper surface leaves the wide coupling slot of 12mm 6, and namely herein lower floor's couplant substrate exposes;

The upper strata antenna medium substrates overlays lower floor's couplant substrate top center, and label antenna is located at upper strata antenna medium substrates upper surface, and label antenna is connected with radio-frequency (RF) identification chip, radio-frequency (RF) identification chip be positioned at coupling slot directly over;

Described label antenna is little band metal antenna, and it is monosymmetric aerofoil profile fine strip shape structure, the middle radio-frequency (RF) identification chip that connects; Label antenna and radio-frequency (RF) identification chip impedance conjugate impedance match; The perpendicular direction of label antenna direction and coupling slot;

The anti-metallic RF identification of described double-decker electronic tag also is provided with plastic casing, to prevent the water infiltration and to prevent mechanical impact;

Described lower floor couplant substrate is the PP plastics; Described shell adopts the PC plastics.

As shown in Figure 3, the anti-metallic RF identification of present embodiment double-decker electronic tag centre frequency is 915MHz, 20 ℃ of laboratory temperatures, during relative humidity 48%, under the normal illumination, reads distance and can reach 12 meters; Can reach 16 meters and under the darkroom, read distance.As shown in Figure 4, the anti-metallic RF identification of present embodiment double-decker electronic tag has omnibearing reading angular.Reading distance with the technological document that reading angular detects institute's foundation is: EPC C1G2Static Test Method For Applied Tag Performance Testing v1.9.52008-07-21FINAL.

Principle of work of the present utility model is as follows:

The electromagnetic energy that reader sends through antenna passes to label antenna by the coupled structure of lower floor's couplant substrate with energy, label antenna and radio-frequency (RF) identification chip impedance conjugate impedance match, the electromagnetic energy that label antenna obtains activates radio-frequency (RF) identification chip, and radio-frequency (RF) identification chip feeds back to reader with information;

Make label be operated in optimum state by its centre frequency of width adjusting of regulating coupling slot, thereby realize when label is attached on the different materials, reaching the distance that reads of the best, therefore, the utility model is not only applicable to be attached on the metal material, can be used on other special materials yet;

Outer the arranging of aluminium foil of lower floor's couplant substrate reduced the metallic surface effect, avoided near the field decay in metal surface.

Claims (8)

1. the anti-metallic RF identification of a double-decker electronic tag is characterized in that, comprises lower floor's couplant substrate, upper strata antenna medium substrates, label antenna, radio-frequency (RF) identification chip;

Lower floor's couplant substrate upper and lower surface all is coated with metal forming, and the metal forming of upper and lower surface is connected, and the metal forming of upper surface leaves the coupling slot of setting width;

The upper strata antenna medium substrates overlays lower floor's couplant substrate top center, and label antenna is located at upper strata antenna medium substrates upper surface, and label antenna is connected with radio-frequency (RF) identification chip, radio-frequency (RF) identification chip be positioned at coupling slot directly over.

2. the anti-metallic RF identification of double-decker as claimed in claim 1 electronic tag is characterized in that described metal forming is aluminium foil.

3. the anti-metallic RF identification of double-decker as claimed in claim 1 electronic tag is characterized in that described lower floor couplant substrate, upper strata antenna medium substrates all are rectangle.

4. the anti-metallic RF identification of double-decker as claimed in claim 1 electronic tag is characterized in that described lower floor couplant substrate is low-loss material.

5. the anti-metallic RF identification of double-decker as claimed in claim 4 electronic tag is characterized in that described lower floor couplant substrate is engineering plastics.

6. the anti-metallic RF of double-decker as claimed in claim 1 is identified electronic tag, it is characterized in that described label antenna is little band metal antenna, it is two symmetrical lateral wing type fine strip shape structures, middle radio-frequency (RF) identification chip, label antenna and the radio-frequency (RF) identification chip impedance conjugate impedance match of connecting.

7. the anti-metallic RF identification of double-decker as claimed in claim 1 electronic tag is characterized in that the perpendicular direction of described label antenna direction and coupling slot.

8. the anti-metallic RF identification of double-decker as claimed in claim 1 electronic tag is characterized in that, the anti-metallic RF identification of described double-decker electronic tag also is provided with plastic casing.

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