CN215341153U - Graphene RFID electronic tag of high-frequency square coil antenna - Google Patents
Graphene RFID electronic tag of high-frequency square coil antenna Download PDFInfo
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- CN215341153U CN215341153U CN202121750941.9U CN202121750941U CN215341153U CN 215341153 U CN215341153 U CN 215341153U CN 202121750941 U CN202121750941 U CN 202121750941U CN 215341153 U CN215341153 U CN 215341153U
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Abstract
The utility model relates to a graphene RFID electronic tag of a high-frequency square coil antenna, which comprises: the antenna comprises an initial end and a termination end, the antenna extends from the initial end to form a coil, and the terminal point of the antenna is set as the termination end; the ratio of the antenna wire diameter to the antenna distance of the coil is 6: 5; the number of turns of the coil ranges from 5 to 7; the electronic chip is arranged at the starting end or the terminating end; the bridge is used for connecting the starting end and the terminating end of the antenna so as to enable the coil to form a loop; the substrate is used for bearing the antenna, the bridge and the electronic chip; the antenna has high transmission efficiency, good performance index, the shape of a square antenna, exquisite size, simple structure and low manufacturing cost, and is easy to be combined with other objects.
Description
Technical Field
The utility model relates to the field of electronic tag manufacturing, in particular to a graphene RFID electronic tag of a high-frequency square coil antenna.
Background
The RFID system is a non-contact automatic identification system, which automatically identifies a target object by a radio frequency wireless signal and acquires related data. RFID can be classified into low frequency, high frequency, and ultra high frequency according to the frequency of electromagnetic waves used by the RFID system. The RFID system has different compositions due to different applications, but basically comprises three major parts, namely an electronic tag, a reader-writer and an application system.
The electronic tag generally comprises a tag antenna and a tag chip; the tag antenna is important for the RFID system and is a key component for determining the performance of the RFID system. Regarding the square antenna, when the antenna is designed, the inductance of the antenna needs to be improved so as to improve the working efficiency of the antenna, and the antenna with good performance index is designed; meanwhile, the requirements of small size, simple structure, low cost and easy combination with other objects are met, and a novel RFID electronic tag is provided based on the application.
SUMMERY OF THE UTILITY MODEL
The graphene RFID electronic tag of the high-frequency square coil antenna has the advantages of high transmission efficiency, good performance index, shape of the square antenna, exquisite size, simple structure, low manufacturing cost and easiness in combination with other objects, so that the technical problem is solved.
The technical scheme adopted by the utility model for solving the technical problems is as follows: a graphene RFID electronic tag of a high-frequency square coil antenna structurally comprises: the antenna comprises an initial end and a termination end, the antenna extends from the initial end to form a coil, and the terminal point of the antenna is set as the termination end; the ratio of the antenna wire diameter to the antenna distance of the coil is 6: 5; the number of turns of the coil ranges from 5 to 7; the electronic chip is arranged at the starting end or the terminating end; the bridge is used for connecting the starting end and the terminating end of the antenna so as to enable the coil to form a loop; the substrate is used for bearing the antenna, the bridge and the electronic chip.
The structure enables the antenna to bear the electronic chip, when the electronic tag works, the electronic tag receives a radio frequency signal sent by the interpreter after entering a magnetic field, the radio frequency signal is transmitted to the electronic chip through the antenna by virtue of energy obtained by induced current, an internal circuit of the electronic chip is activated, information stored in the electronic chip can be sent out, and the interpreter reads and decodes the information and sends the decoded information to the central information system for related data processing. The structure in this application is then through improving the transmission efficiency of antenna to induced-current, and then improves electronic tags's work efficiency.
In a preferred implementation mode, the antenna extends from inside to outside, and the starting end is located inside the coil, so that the antenna coil has a more exquisite and simple structure, and the working efficiency of the coil is ensured, therefore, the antenna is arranged from inside to outside in a loop-by-loop mode.
In a preferred implementation mode, the coil is rectangular, and the electronic chips respectively connected with the start end and the termination end are respectively located at the inner side and the outer side of the rectangular coil at the same included angle. The starting end and the terminating end of the antenna are respectively positioned at the inner side and the outer side of an included angle of the antenna coil, and the distance between the starting end and the terminating end is short, so that the starting end and the terminating end are connected by a convenient bridge, and the antenna coil forms a loop together.
In a preferred implementation, the four included angles of the rectangular coil are set as rounded corners, and the antenna at the terminating end is set as a triangle to match the rounded corner setting of the rectangular coil. Four included angles of the rectangular coil are set to be round corners, so that the turning reversing of the antenna is arc-shaped, the conduction of current is facilitated, the influence of the turning reversing of the antenna on the current can be reduced as much as possible, the antenna is better matched with an electronic chip, and the electronic tag has more stable performance.
In a preferred implementation, the number of turns of the antenna is set to 7, the wire pitch is set to 0.25mm, and the wire diameter is set to 0.3 mm. The transmission efficiency of the antenna is related to the inductance value, the energy loss of the antenna coil is related to the number of turns of the antenna, the diameter of the antenna wire and the distance between the antenna wires, and when the antenna is designed, the influence of each parameter of the antenna on the antenna inductance is comprehensively considered, so that the antenna with good performance index is designed. When the number of turns, the wire diameter and the wire spacing of the antenna are selected, a comparison experiment is carried out so as to select an optimal scheme. According to the requirements of the size of the tag, the working frequency, the matching chip and the application condition, an antenna model is established, simulation calculation is carried out on the antenna model, simulation is carried out by adopting HFSS electromagnetic simulation software, and the influence of the number of turns of a coil, the wire diameter and the wire distance on the antenna performance inductance is tested under the loading of the same 13.56MHz signal.
(1) Keeping the wire diameter and the coil spacing constant, which are 0.5mm and 1mm, respectively, as shown in fig. 2, it can be seen from fig. 2 that changing the number of turns of the coil will affect the inductance of the antenna under the condition that the wire diameter and the line spacing are kept constant. The inductance value increases along with the increase of the number of turns of the coil, the increase range is changed from fast to slow, mainly because the difference between the circumference of the coil of the inner ring and the circumference of the coil of the outer ring is larger and larger, and a certain limit is generated on the increase trend of the inductance value.
(2) Keeping the number of turns of the coil and the distance between the wires constant, the influence of the test wire diameter on the inductance value of the coil is shown in fig. 3, and as the wire diameter increases, the inductance value decreases, mainly because the skin effect and the proximity effect dominate in the high frequency band, which results in the inductance value decreasing, as can be seen from fig. 3.
(3) Keeping the number of turns of the coil and the wire diameter unchanged, the trend of the inductance of the test antenna along with the change of the coil distance can be seen from fig. 4, and the inductance of the coil is gradually increased along with the reduction of the coil distance, mainly because the small coil distance can increase the magnetic field coupling of the inductance, thereby increasing the mutual inductance value and further increasing the inductance value. It can also be seen that the effect of the line spacing on the inductance value is relatively small compared to the effect of the line diameter on the inductance value.
According to the test result, the number of turns of the coil of the selected antenna is set to be 7, the wire spacing is set to be 0.25mm, the performance of the antenna with the wire diameter of 0.3mm under the same loading of 13.56MHz signals is optimal, and the reading and writing distance reaches 6 cm.
In a preferred implementation, the bridge is provided as a conductive glue. The conductive adhesive is very flexible to use, and can be connected with the start end and the termination end of the antenna at will according to the relative positions of the start end and the termination end of the antenna, so that the antenna is conducted, and the antenna is favorably produced; and the conductive adhesive has good conductive capability, and can effectively ensure the working efficiency of the antenna.
In a preferred implementation, the antenna is formed by printing a graphene conductive paste. The graphene conductive paste can effectively improve the conductivity and stability of the antenna, and can be printed on almost all substrates such as plastic films, paper, ceramics, fibers and the like.
In a preferred implementation, the starting end of the antenna is provided with a corner to keep the electronic chip connected to the starting end away from the coil. In the embodiment, the electronic chip is arranged at the starting end inside the antenna coil, the starting end of the antenna is provided with a corner, and the corner enables the electronic chip connected with the starting end to be far away from the coil, so that the influence of current flowing through the coil on the electronic chip can be reduced; secondly also can provide more sufficient space for electronic chip's installation, promote the installation effect, be favorable to guaranteeing the stability of electronic tags performance.
In a preferred embodiment, the substrate is a PET substrate. The PET substrate has good mechanical property, impact strength 3-5 times that of other films, good folding resistance, dilute acid resistance, diluted alkali resistance, most solvent resistance, high and low temperature resistance, long-term use at 120 ℃, high temperature resistance of 150 ℃ in short-term use, low temperature resistance of-70 ℃, little influence on the mechanical property at high and low temperatures, no toxicity, no odor and good sanitary safety.
In a preferred embodiment, the outer contour of the coil is square, the length dimension thereof is 45mm, and the width dimension thereof is 45 mm. The antenna has a small size, can be flexibly applied, and contributes to miniaturization of the antenna.
The utility model adopts the structure and has the advantages that: the antenna has high transmission efficiency, good performance index, the shape of a square antenna, exquisite size, simple structure, low manufacturing cost and easy combination with other objects.
Drawings
The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model and not to limit the utility model. In the drawings:
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a graph of inductance versus number of turns of the coil in accordance with the present invention.
Fig. 3 is a graph showing the relationship between the inductance and the wire diameter according to the present invention.
Fig. 4 is a graph of inductance versus coil spacing according to the present invention.
In the figure, the position of the upper end of the main shaft,
1. an antenna; 101. a starting end; 102. a terminating end; 103. a corner; 2. an electronic chip; 3. bridging; 4. a substrate.
Detailed Description
In order to more clearly explain the overall concept of the present invention, the following detailed description is given by way of example in conjunction with the accompanying drawings.
It should be noted that in the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and thus the scope of the present invention is not limited by the specific embodiments disclosed below.
As shown in fig. 1 to 4, a graphene RFID tag of a high-frequency square coil antenna has a structure including: the antenna comprises an antenna 1, an electronic chip 2, a bridge 3 and a base material 4, wherein the antenna 1 comprises an initial end 101 and a terminating end 102, the antenna 1 extends from the initial end 101 to form a coil one by one, and the terminal point of the antenna 1 is set as the terminating end 102; the ratio of the wire diameter of the antenna 1 to the antenna distance of the coil is 6: 5; the number of turns of the coil ranges from 5 to 7; the electronic chip 2 is arranged at the starting end 101 or the terminating end 102; the bridge 3 is used for connecting the starting end 101 and the terminating end 102 of the antenna 1, so that the coil forms a loop; the substrate 4 is used for bearing the antenna 1, the bridge 3 and the electronic chip 2.
The structure enables the antenna 1 to bear the electronic chip 2, when the electronic tag works, the electronic tag receives radio frequency signals sent by the reader after entering a magnetic field, the antenna 1 transmits current to the electronic chip 2 through the energy obtained by induced current, an internal circuit of the electronic chip 2 is activated, information stored in the electronic chip 2 can be sent out, and the reader reads and decodes the information and sends the decoded information to the central information system for related data processing. The structure in this application is then through improving the transmission efficiency of antenna to induced-current, and then improves electronic tags's work efficiency.
In a preferred implementation, the antenna 1 extends from the inside to the outside, and the starting end 101 is located inside the coil, so that the antenna 1 is arranged from the inside to the outside in a way that the coil turns by turns in order to make the coil have a more delicate and simple structure and to ensure the working efficiency of the coil.
In a preferred implementation, the coil is rectangular, and the electronic chips 2 respectively connected to the start end 101 and the end 102 are respectively located at the inner side and the outer side of the rectangular coil at the same included angle. The start end 101 and the stop end 102 of the antenna 1 are respectively located at the inner side and the outer side of an included angle of the coil of the antenna 1, and at this time, the distance between the start end 101 and the stop end 102 is short, so that the start end 101 and the stop end 102 are connected by the bridge 3 conveniently, and the coil of the antenna 1 forms a loop together.
In a preferred implementation, the four included angles of the rectangular coil are set as rounded corners, and the antenna 1 at the terminating end 102 is set as a triangle to match the rounded corner setting of the rectangular coil. The four included angles of the rectangular coil are set to be round corners, so that the turning reversing of the antenna 1 is in a circular arc shape, the conduction of current is facilitated, the influence of the turning reversing of the antenna 1 on the current can be reduced as much as possible, the antenna 1 and the electronic chip 2 are better matched, and the electronic tag has more stable performance.
In a preferred implementation, the number of coil turns of the antenna 1 is set to 7, the wire pitch is set to 0.25mm, and the wire diameter is set to 0.3 mm. The transmission efficiency of the antenna 1 is related to the inductance value, the energy loss of the coil of the antenna 1 is related to the number of turns of the antenna 1, the wire diameter of the antenna 1 and the distance between the lines of the antenna 1, and when the antenna 1 is designed, the influence of each parameter of the antenna 1 on the inductance of the antenna 1 is comprehensively considered, so that the antenna 1 with good performance index is designed. When the number of turns, the wire diameter and the wire spacing of the antenna 1 are selected, a comparison experiment is carried out so as to select an optimal scheme. According to the requirements of the size of the tag, the working frequency, the matching chip and the application condition, an antenna 1 model is established, simulation calculation is carried out on the antenna 1 model, HFSS electromagnetic simulation software is adopted for simulation, and the influence of the number of turns of a coil, the wire diameter and the wire distance on the performance inductance of the antenna 1 is tested under the loading of the same 13.56MHz signal.
(1) Keeping the wire diameter and the coil spacing constant, which are 0.5mm and 1mm, respectively, as shown in fig. 2, it can be seen from fig. 2 that changing the number of turns of the coil will affect the inductance of the antenna 1 under the condition that the wire diameter and the line spacing are kept constant. The inductance value increases along with the increase of the number of turns of the coil, the increase range is changed from fast to slow, mainly because the difference between the circumference of the coil of the inner ring and the circumference of the coil of the outer ring is larger and larger, and a certain limit is generated on the increase trend of the inductance value.
(2) Keeping the number of turns of the coil and the distance between the wires constant, the influence of the test wire diameter on the inductance value of the coil is shown in fig. 3, and as the wire diameter increases, the inductance value decreases, mainly because the skin effect and the proximity effect dominate in the high frequency band, which results in the inductance value decreasing, as can be seen from fig. 3.
(3) Keeping the number of turns and the wire diameter of the coil unchanged, the trend of the inductance of the test antenna 1 along with the change of the coil distance can be seen from fig. 4, and the inductance of the coil is gradually increased along with the reduction of the coil distance, mainly because the small coil distance can increase the magnetic field coupling of the inductance, thereby increasing the mutual inductance value and further increasing the inductance value. It can also be seen that the effect of the line spacing on the inductance value is relatively small compared to the effect of the line diameter on the inductance value.
According to the test result, the number of coil turns of the antenna 1 is set to be 7, the wire spacing is set to be 0.25mm, the performance of the antenna 1 with the wire diameter of 0.3mm under the same loading of 13.56MHz signals is optimal, and the reading and writing distance reaches 6 cm.
In a preferred implementation, the bridge 3 is provided as a conductive glue. The conductive adhesive is very flexible to use, and can be connected with the starting end 101 and the terminating end 102 of the antenna 1 at will according to the relative positions of the two ends, so that the two ends are conducted, and the production of the antenna 1 is facilitated; and the conducting resin has good conductivity, can effectively guarantee the work efficiency of antenna 1, more preferably, still be equipped with the insulating layer between conducting resin and the antenna coil, can keep apart conducting resin and antenna coil, avoid the two mutual interference. .
In a preferred implementation, the antenna 1 is formed by printing of a graphene conductive paste. The graphene conductive paste can effectively improve the conductivity and stability of the antenna 1, and can be printed on almost all substrates 4, such as plastic films, paper, ceramics, fibers and the like.
In a preferred implementation, the starting end 101 of the antenna 1 is provided with a corner 103 to distance the electronic chip 2 connected to the starting end 101 from the coil. In the present embodiment, the electronic chip 2 is disposed at the starting end 101 inside the coil of the antenna 1, the starting end 101 of the antenna 1 is provided with a corner 103, and the corner 103 enables the electronic chip 2 connected to the starting end 101 to be far away from the coil, so that the influence of the current flowing through the coil on the coil can be reduced; secondly also can provide more sufficient space for electronic chip 2's installation, promote the installation effect, be favorable to guaranteeing the stability of electronic tags performance.
In a preferred embodiment, the substrate 4 is a substrate made of PET. The PET substrate has good mechanical property, impact strength 3-5 times that of other films, good folding resistance, dilute acid resistance, diluted alkali resistance, most solvent resistance, high and low temperature resistance, long-term use at 120 ℃, high temperature resistance of 150 ℃ in short-term use, low temperature resistance of-70 ℃, little influence on the mechanical property at high and low temperatures, no toxicity, no odor and good sanitary safety.
In a preferred embodiment, the outer contour of the coil is square, the length dimension thereof is 45mm, and the width dimension thereof is 45 mm. The antenna 1 is small in size, can be flexibly applied, and contributes to downsizing of the antenna 1.
The technical solutions protected by the present invention are not limited to the above embodiments, and it should be noted that the combination of the technical solution of any one embodiment and the technical solution of one or more other embodiments is within the protection scope of the present invention. Although the utility model has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the utility model. Accordingly, such modifications and improvements are intended to be within the scope of the utility model as claimed.
Claims (10)
1. The utility model provides a graphite alkene RFID electronic tags of square coil antenna of high frequency which characterized in that includes:
the antenna comprises a starting end and a terminating end, the antenna extends from the starting end one by one to form a coil, and the terminal point of the antenna is set as the terminating end; the ratio of the antenna wire diameter to the antenna distance of the coil is 6: 5; the number of turns of the coil ranges from 5 to 7;
the electronic chip is arranged at the starting end or the terminating end;
the bridge is used for connecting the starting end and the terminating end of the antenna so as to enable the coil to form a loop;
the base material is used for bearing the antenna, the bridge and the electronic chip.
2. The graphene RFID tag of the high-frequency square coil antenna according to claim 1, wherein the antenna extends from inside to outside, and the starting end is located inside the coil.
3. The graphene RFID tag of the high-frequency square coil antenna according to claim 2, wherein the coil is rectangular, and the electronic chips respectively connected with the start end and the stop end are respectively located at the inner side and the outer side of the rectangular coil at the same included angle.
4. The graphene RFID tag of claim 3, wherein four included angles of the rectangular coil are set to be rounded corners, and the antenna at the terminating end is set to be triangular so as to match the rounded corners of the rectangular coil.
5. The graphene RFID tag of the high-frequency square coil antenna according to claim 1, wherein the number of coil turns of the antenna is set to 7, the wire pitch is set to 0.25mm, and the wire diameter is set to 0.3 mm.
6. The graphene RFID tag of the high-frequency square coil antenna according to claim 1, wherein the bridge is made of conductive adhesive.
7. The graphene RFID tag of the high-frequency square coil antenna according to claim 1, wherein the antenna is formed by printing graphene conductive paste.
8. The graphene RFID tag of the high-frequency square coil antenna according to claim 1, wherein the starting end of the antenna is provided with a corner to enable an electronic chip connected with the starting end to be far away from the coil.
9. The graphene RFID tag of the high-frequency square coil antenna according to claim 1, wherein the substrate is a PET substrate.
10. The graphene RFID tag of the high-frequency square coil antenna according to claim 1, wherein the outer contour of the coil is square, the length dimension of the coil is 45mm, and the width dimension of the coil is 45 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121750941.9U CN215341153U (en) | 2021-07-29 | 2021-07-29 | Graphene RFID electronic tag of high-frequency square coil antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121750941.9U CN215341153U (en) | 2021-07-29 | 2021-07-29 | Graphene RFID electronic tag of high-frequency square coil antenna |
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| Publication Number | Publication Date |
|---|---|
| CN215341153U true CN215341153U (en) | 2021-12-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121750941.9U Active CN215341153U (en) | 2021-07-29 | 2021-07-29 | Graphene RFID electronic tag of high-frequency square coil antenna |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215341153U (en) |
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2021
- 2021-07-29 CN CN202121750941.9U patent/CN215341153U/en active Active
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