CN114282635B - Chipless tag with high environment-resistant scattering intensity - Google Patents
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Abstract
An environment-resistant chipless tag with high scattering intensity relates to the field of electronic tags. The label comprises a plurality of chipless label units and a substrate, wherein a single chipless label unit comprises a medium layer and a conductive patch layer arranged on the medium layer, a plurality of triangular annular gap resonant cavities are arranged on the conductive patch layer, the resonant frequency is adjusted by changing the length of the triangular annular gap resonant cavities, and the chipless label units are arranged on the substrate according to triangular distribution. The label has the advantages that: the designed triangular resonant structure is directly utilized, so that the tag has the characteristic of insensitivity to the polarization direction and has a higher Q value. In the frequency band of 100MHz of 3.45-3.55GHz, three or more kinds of tag codes can be realized, and the frequency spectrum utilization rate of the invention is higher. The label media substrate has higher utilization and can realize higher coding capacity in smaller size, namely higher data capacity density. The label structural design is simpler, more workable.
Description
Technical Field
The invention relates to the field of electronic tags, in particular to an environment-resistant chipless tag with high scattering intensity.
Background
The chipless tag adopts a mode of transmitting a broadband scanning frequency signal by a read-write antenna, then captures a back scattering signal of the tag on a receiving antenna, and has the characteristics of low power consumption and simple structure. And compared with the traditional RFID tag, the chipless RFID tag has the structure without carrying any electronic circuit for processing a communication protocol, so that the manufacturing cost of the chipless RFID tag is effectively reduced. The chipless RFID tag can independently complete the functions of receiving and transmitting electromagnetic waves and encoding, so that the manufacturing process of the tag is simple, and mass production can be realized. But at the same time the chipless tag does not contain a circuit module for communication and an integrated chip for storing information. Chipless tags are therefore mainly used in the case of only tens or hundreds of different recognition object scenes. At the communication frequency level, the radio frequency identification system can be classified into four types of low frequency, high frequency, ultra-high frequency and microwave. The technology level can be classified according to the data storage, power supply mode and development history of the tag, and the technology level can be roughly classified into four categories of active tags, semi-active tags, passive tags and chipless tags. Currently, the label research is being conducted in two directions: the continuous improvement of the existing label realizes higher read-write sensitivity and higher communication security. Secondly, the cost of the label is reduced and the stability of the label is improved as much as possible. Along with the high-speed development of the internet of things, the radio frequency identification system technology becomes an important component of the internet of things, the traditional radio frequency identification system tag cannot replace an optical bar code for large-scale application due to the high cost limit of a chip, and along with the complexity of the application environment of the system and the diversification of influencing factors, the traditional chip radio frequency identification device is difficult to maintain reliable information storage and identification sometimes, and the main reason is that the connection between the chip and an antenna is easily influenced by the interference of the environmental temperature and noise, and the stability of the connection generally determines the performance of the radio frequency identification device, so that the birth of the chipless radio frequency identification technology is promoted. The chipless radio frequency identification technology loads the information of identification contained in the chipless tag into an electromagnetic signal by utilizing a radar communication principle, and the tag is similar to a common bar code and a two-dimensional code in function, but has unique advantages in the aspects of width and breadth of application fields and commercial marketization, including identifiable functions in a no-light environment, lower cost to meet the requirement of mass production, possibility of combining with a green environment-friendly technology, great potential of being converted into a sensor and the like.
Disclosure of Invention
In order to realize the chipless tag with high environment-resistant scattering intensity in a narrow frequency band, the invention adopts the following technical scheme:
the utility model provides an anti environment high scattering intensity's chipless label, includes a plurality of chipless label units and substrate base plate, and single chipless label unit includes the dielectric layer and sets up the conductive patch layer on the dielectric layer, is provided with a plurality of triangle ring slot resonant cavities on the conductive patch layer, adjusts resonant frequency through the length that changes triangle ring slot resonant cavity, and a plurality of chipless label units set up on substrate base plate according to triangle-shaped distribution.
Specifically, in the chipless tag unit, the conductive patch layer is a regular triangle with a side length of 24.42mm, three regular triangle annular gap resonant cavities are sequentially and equally arranged in the conductive patch layer, the width of each gap ranges from 0.1 mm to 0.25mm, the distance between adjacent gaps is 0.2mm, and the side length of the outermost triangular annular gap is 22.4mm; the dielectric layer is a regular triangle with a side length of 31.35mm and a thickness of 0.5mm.
And utilizing regular triangle slot resonators with different side lengths to correspond to different frequency resonance frequency points, wherein each resonance frequency point corresponds to one type of encoded data. And (3) vertically irradiating the incident wave to the tag to be detected, and observing the scattering signal from the upper part to obtain the single-station scattering characteristic of the tag. The 100MHz bandwidth of the observation frequency band is divided into three sections, when RCS peak frequency points fall in different frequency bands, the RCS peak frequency points are regarded as chipless labels with different numbers, and when the slot side length of a single ring of the label is changed, the peak frequency points are respectively 3.45-3.47GHz, 3.47-3.52GHz and 3.52-3.55GHz. Thus, the tag has more than three discrimination degrees within the bandwidth of 100MHz according to the different areas where the peak frequency points fall.
Specifically, there are six chipless label units, and six chipless label units are arranged according to an equilateral triangle, and three chipless label units are arranged on each side. Further, the geometric centers of each chipless label unit are spaced 55mm apart. Six chipless tag units are assembled into a triangle, and the triangular assembling mode is matched with the triangular shape of the chipless tag units, so that the incident angle stability and the high quality factor of the tag can be ensured. After the array is formed, the backscattering level of the tag can reach a level of about-3 dB, and the environment resistance of the tag is improved.
Specifically, the dielectric layer was made of F4B-2 material, and had a loss tangent of 0.019 and a dielectric constant of 2.55.
In summary, the device of the invention has the following advantages: the designed triangular resonant structure is directly utilized, so that the tag has the characteristic of insensitivity to the polarization direction. The radar communication principle is utilized, the continuous and uniform plane wave irradiates the target chipless tag, the RCS is measured by utilizing the scattered echo of the target, and the spectrum information of the chipless tag is obtained. The structure of the design chipless tag is more sensitive to the resonance frequency point and has a higher Q value. In the frequency band of 100MHz of 3.45-3.55GHz, three or more kinds of tag codes can be realized, which shows that the frequency spectrum utilization rate of the invention is higher. The label media substrate has higher utilization and can realize higher coding capacity in smaller size, namely higher data capacity density. The label structural design is simpler, more workable.
Drawings
FIG. 1 is a structural top view of a chipless label unit;
FIG. 2 is a structural top view of an environmentally resistant high scattering strength tag;
FIG. 3 is a spectral diagram of a chipless tag with high scattering intensity against the environment;
FIG. 4 is a graph of a spectrum of a label with high scattering intensity against the environment after placing glass 1mm below the label without chips;
FIG. 5 is a graph of the spectrum of a label after placing glass 50mm below a chipless label of high scattering strength against the environment;
FIG. 6 is a graph of a chipless tag spectrum with anti-environmental high scattering intensity with 10 deg. intervals for changing the polarization direction of the incident wave;
FIG. 7 is a graph of RCS amplitude-frequency characteristics of a tag at normal incidence on a tag with high scattering intensity against the environment;
fig. 8-10 are spectral diagrams of chipless tag units;
reference numerals: 1 a dielectric layer; 2 a conductive patch layer; 3, a gap resonant cavity; 4 substrate base plate.
Detailed Description
In the current popular chipless label design, due to the limitation of low quality factors of frequency bands and labels, only a limited number of labels can be encoded within a certain bandwidth, so that in order to design a label with a high quality factor, as many codes as possible can be encoded within a certain bandwidth, the present invention designs a chipless label with high scattering strength against environment, and the present invention is further described below with reference to fig. 1 to 10.
As shown in fig. 1 and 2, a chipless tag with high scattering intensity against the environment includes 6 chipless tag units and a substrate board 4. The single chipless tag unit comprises a medium layer 1 and a conductive patch layer 2 arranged on the medium layer 1, wherein the conductive patch layer 2 is in a regular triangle with a side length of 24.42mm, three regular triangle annular gap resonant cavities 3 are sequentially arranged in the conductive patch layer 2 at equal intervals, the width of each gap resonant cavity 3 is 0.2mm, the adjacent gap spacing is 0.2mm, and the side length of the outermost triangular annular gap is 22.4mm. The dielectric layer 1 is a regular triangle with a side length of 31.35mm and a thickness of 0.5mm. Dielectric layer 1 was made of F4B-2 material, and had a loss tangent of 0.019 and a dielectric constant of 2.55. Six chipless tag units are arranged on the substrate 4 according to an equilateral triangle, three chipless tag units are arranged on each side, and the geometric centers of the chipless tag units are spaced 55mm apart.
Three regular triangle slot resonators with different side lengths are utilized in a single chipless tag unit to correspond to different frequency resonance frequency points, and each resonance frequency point corresponds to one type of coded data. As shown in fig. 8 to 10, in order to verify the spectral characteristics of the chipless tag unit, the single-station scattering characteristics of the tag can be obtained when the incident wave perpendicularly irradiates the chipless tag unit and the scattering signal is observed above. The 100MHz bandwidth of the observation frequency band is divided into three sections, when RCS peak frequency points fall in different frequency bands, the RCS peak frequency points are regarded as chipless labels with different numbers, and when the slot side length of a single ring of the label is changed, the peak frequency points are respectively 3.45-3.47GHz, 3.47-3.52GHz and 3.52-3.55GHz. Thus, the tag has more than three discrimination degrees within the bandwidth of 100MHz according to the different areas where the peak frequency points fall. In addition to this, the regular triangle slot resonator has two main advantages over other resonator structures, firstly, the odd-even harmonic current path is not prominent due to the continuous structure of the regular triangle resonator, so the resonant notch of the resonator at the second harmonic is negligible, and the third harmonic is not present in the back-scattered signal of the regular triangle slot resonator on the patch. Therefore, compared with other resonant structures, the invention has the natural noise elimination function of the extracted RCS characteristics.
The width of the slit is kept unchanged, the size and the position of the slit of the inner layer are unchanged, the distance between the two slits is changed, namely the side length of an outer slit ring is changed, the change of the position of the peak in the scattering characteristic is observed, the peak frequency point of the RCS is determined by the outer slit, the larger the size of the slit is, the lower the peak frequency point is, and the bandwidth of-5 dB is wider. The "-5dB bandwidth" refers to the range of frequencies swept in the scattering characteristic at which the RCS value at the peak drops by-5 dB, which values can characterize to some extent the sharpness of the peak, the narrower the-5 dB bandwidth, the higher the representative figure of merit. In frequency domain chipless tags, the quality factor of the resonant notch is very important, which determines the frequency band utilization and coding capacity of the tag. If the quality factor of a notch is too low, the bandwidth occupied by the notch is very wide, and the number of notches which can be accommodated by the UWB band with fixed bandwidth is smaller, so that the coding capacity is greatly reduced. After 6 chipless tag units are assembled, as shown in fig. 7, the backscattering level of the tag can reach about-3 dB, and the influence of gaussian noise and other interference of the environment on the tag is certain, so that the anti-interference of the tag array can be improved by reasonably selecting the distance between the tags for the assembly.
In the actual application scene, electromagnetic waves can be incident from different angles, and incident waves at the same angle have different polarizations, so that the research on what change of the scattering characteristics of the tag occurs in the scene of changing the direction of the incident angle is needed, and if the change of the scattering characteristics of the tag is very small, the environment interference resistance of the tag is strong, and the tag has the potential of being truly put into production. As shown in fig. 3, 6 sets of incident waves with polarization directions along the Y-axis are disposed at positions of 0 ° 20 ° 40 ° 60 ° 80 ° 90 ° in phi=0° in the plane, wherein M1 to M6 in the legend in fig. 3 represent respective angles of 60 ° 80 ° 90 ° in theta of 0 ° 20 ° 40 ° 60 ° in fig. 3, and it can be derived from fig. 3 that the peak value of RCS floats between 3.4937 to 3.5063GHz, and the floating range is smaller than 15MHz. The incoming wave direction of the incoming wave is unchanged (theta=0°), the polarization direction of the incoming wave is changed at intervals of 10 DEG, the peak frequency point of the RCS is not changed along with the change of the incoming wave, and the change of the polarization direction can be judged according to the change, so that the peak frequency point of the label is hardly influenced.
To verify the effect of the environment on the scattering properties of the labels of the present invention, an environmental simulation was performed by adding 100 x 5mm glass 1mm below the dielectric plate of the label array, as shown in fig. 4, and the scattering properties of the labels were found to have been submerged in the scattering properties of the glass. As shown in fig. 5, after the distance between the glass and the tag array is increased to 50mm, 100×100×5mm glass is placed at a position 50mm below the dielectric plate, and the frequency point of the backscattering characteristic curve obtained in fig. 5 does not exceed 10MHz. Therefore, when the environmental interference is very close to the tag, the environmental interference variable is very strong, the tag is small in size, the backward scattering energy is limited, the capability of resisting the environmental interference is certain, and the backward scattering curve is changed greatly, but when the environmental interference variable is gradually weakened to a certain value, the tag can resist the environmental interference.
The invention relates to a polarization direction insensitive tag, electromagnetic waves can be incident from different angles in an actual application scene, so that the study on the change of scattering characteristics of the tag in the scene of changing the incident angle direction is needed, and 6 groups of incident waves with polarization directions along the Y axis are respectively arranged at positions of theta of 0 DEG 20 DEG 40 DEG 60 DEG 80 DEG 90 DEG in a phi=0 DEG plane. The peak of the RCS floats between 3.4937-3.5063GHz, with a float range of less than 15MHz. The incoming wave direction of the incoming wave is unchanged (theta=0°), the polarization direction of the incoming wave is changed at intervals of 10 DEG, the peak frequency point of the RCS is not changed along with the change of the incoming wave, and the change of the polarization direction can be judged according to the change, so that the peak frequency point of the label is hardly influenced.
To verify the effect of the environment on the scattering properties of the labels, an environmental simulation was performed by adding 100 x 5mm glass 1mm below the dielectric sheet of the labels, and the scattering properties of the labels were found to be already submerged in the scattering properties of the glass. After the distance between the glass and the tag is increased, the peak frequency point in the scattering characteristic curve does not change by more than 10MHz. Therefore, the invention is seriously influenced by the environment, and is more suitable for the environment without strong scatterers around.
As can be seen from the above description, the device has the following advantages: the designed triangular resonant structure is directly utilized, so that the tag has the characteristic of insensitivity to the polarization direction. The radar communication principle is utilized, the continuous and uniform plane wave irradiates the target chipless tag, the RCS is measured by utilizing the scattered echo of the target, and the spectrum information of the chipless tag is obtained. The structure of the design chipless tag is more sensitive to the resonance frequency point and has a higher Q value. In the frequency band of 100MHz of 3.45-3.55GHz, three or more kinds of tag codes can be realized, which shows that the frequency spectrum utilization rate of the invention is higher. The label media substrate has higher utilization and can realize higher coding capacity in smaller size, namely higher data capacity density. The label structural design is simpler, more workable.
It is to be understood that the foregoing detailed description of the invention is merely illustrative of the invention and is not limited to the embodiments of the invention. It will be understood by those of ordinary skill in the art that the present invention may be modified or substituted for elements thereof to achieve the same technical effects; as long as the use requirement is met, the invention is within the protection scope of the invention.
Claims (1)
1. The chip-free label is characterized by comprising a plurality of chip-free label units and a substrate, wherein each chip-free label unit comprises a medium layer and a conductive patch layer arranged on the medium layer, a plurality of triangular annular gap resonant cavities are arranged on the conductive patch layer, the resonant frequency is adjusted by changing the length of each triangular annular gap resonant cavity, and the plurality of chip-free label units are distributed on the substrate according to triangles;
in the chipless tag unit, the conductive patch layer is in the shape of a regular triangle with a side length of 24.42mm, three regular triangle annular gap resonant cavities are sequentially and equidistantly arranged on the conductive patch layer, the width of each gap ranges from 0.1 mm to 0.25mm, the distance between adjacent gaps is 0.2mm, and the side length of the outermost triangular annular gap is 22.4mm; the dielectric layer is a regular triangle with the side length of 31.35mm and the thickness of 0.5mm;
six chipless label units are arranged according to an equilateral triangle, and three chipless label units are arranged on each side; the geometric centers of each chipless label unit are spaced 55mm apart;
the dielectric layer is made of F4B-2 material, the loss tangent is 0.019, and the dielectric constant is 2.55;
the chipless tag unit divides a 100MHz frequency band of 3.45-3.55GHz into three sections, and peak frequency points are respectively 3.45-3.47GHz, 3.47-3.52GHz and 3.52-3.55GHz to form more than three discriminations.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20080041411A (en) * | 2006-11-07 | 2008-05-13 | 인하대학교 산학협력단 | Saw based chipless passive rfid tag using cellulose paper as the substrate and method for manufaturing the cellulose paper |
| CN103955731A (en) * | 2014-04-30 | 2014-07-30 | 集美大学 | Chip-free label of gap ring structure |
| CN207851872U (en) * | 2018-02-02 | 2018-09-11 | 集美大学 | A kind of microstrip coupled resonator of L-type can retransmit Chip-free label |
| CN108682969A (en) * | 2018-03-16 | 2018-10-19 | 南京理工大学 | A kind of anti-metal RFID tag of passive chipless |
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- 2021-12-30 CN CN202111655375.8A patent/CN114282635B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20080041411A (en) * | 2006-11-07 | 2008-05-13 | 인하대학교 산학협력단 | Saw based chipless passive rfid tag using cellulose paper as the substrate and method for manufaturing the cellulose paper |
| CN103955731A (en) * | 2014-04-30 | 2014-07-30 | 集美大学 | Chip-free label of gap ring structure |
| CN207851872U (en) * | 2018-02-02 | 2018-09-11 | 集美大学 | A kind of microstrip coupled resonator of L-type can retransmit Chip-free label |
| CN108682969A (en) * | 2018-03-16 | 2018-10-19 | 南京理工大学 | A kind of anti-metal RFID tag of passive chipless |
Non-Patent Citations (1)
| Title |
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| 基于三角形缝隙谐振器的无芯RFID标签设计;贾胤 等;《传感器与微***》;第37卷(第6期);第75-78页 * |
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