Slot antenna and electronic tag
By designing a slot antenna and adjusting the radiating structure of the slot antenna, the problem of RFID tag radiation pattern distortion on car windshields was solved, enabling efficient identification by RFID readers and reducing misoperation.
Patent Information
- Application Number
- CN202423322419.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-31
- Publication Date
- 2025-11-28
- Estimated Expiration
- 2034-12-31
AI Technical Summary
When RFID tags are used on car windshields, the high dielectric constant of the glass causes distortion of the radiation pattern, which affects the reader's recognition efficiency and leads to misoperation.
Design a slot antenna, including a base layer, a radiator, and a chip. The radiator is a slot radiator, and the chip is matched with the radiator. By adjusting the structure of the radiator, such as a T-shaped structure or a ring region, the impedance is adjusted, the matching loss is reduced, and the radiation pattern is improved.
It effectively mitigates the distortion of the radiation pattern of RFID tags, ensuring that the maximum radiation direction faces directly forward, improving the reader's recognition efficiency and reducing misoperation.
Smart Images
Figure CN223612684U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to antenna technical field especially is involved a kind of slot antenna and electronic tag. BACKGROUND
[0002] At present, RFID (Radio Frequency Identification, RFID, radio frequency identification) technology develops more rapidly, in all walks of life, RFID technology is applied.
[0003] However, when using on automobile windshield, due to the dielectric constant of glass is very high, the radiation pattern of RFID tag is distorted, so that RFID tag is poor in the direction of actual need reading performance, and further influence the identification efficiency of RFID reader, lead to misoperation. SUMMARY
[0004] Therefore, the utility model discloses a kind of slot antenna and electronic tag to alleviate the technical problem that the radiation pattern of RFID tag is distorted.
[0005] Firstly, the utility model embodiment provides a kind of slot antenna, the slot antenna includes base layer, and the radiation body and chip being set to the surface of the base layer;The radiation body is slot radiation body, and the chip is matched with the radiation body;The slot radiation body includes first radiation body and second radiation body;The first radiation body constitutes annular region, the chip is arranged in the annular region interior, and the second radiation body is arranged in the annular region exterior.
[0006] In combination with first aspect, the utility model embodiment provides the first possible implementation of first aspect, wherein the second radiation body includes first radiation branch and second radiation branch;The first radiation body is arranged at one end of the first radiation branch, and the second radiation branch is arranged at the other end of the first radiation branch;And the second radiation branch and the first radiation branch are arranged at preset angle.
[0007] In combination with the first possible implementation of first aspect, the utility model embodiment provides the second possible implementation of first aspect, wherein the second radiation branch and the first radiation branch constitute T-shaped structure.
[0008] With reference to the first possible implementation manner of the first aspect, in a third possible implementation manner of the first aspect, the first radiator comprises a first radiation part and a second radiation part; one end of the first radiation part is connected with the first radiation branch; the second radiation part is symmetrically arranged at both ends of the first radiation part, and one end of the second radiation part is connected with the first radiation part, and the other end of the second radiation part extends away from the first radiation part to form the annular area.
[0009] With reference to the third possible implementation manner of the first aspect, in a fourth possible implementation manner of the first aspect, a third radiation part is further arranged inside the annular area; a preset distance is arranged between the outer edge of the third radiation part and the inner edge of the first radiator.
[0010] With reference to the third possible implementation manner of the first aspect, in a fifth possible implementation manner of the first aspect, the first radiator further comprises a fourth radiation part, and the fourth radiation part is arranged at one end of the second radiation part away from the first radiation part.
[0011] With reference to the first possible implementation manner of the first aspect, in a sixth possible implementation manner of the first aspect, the second radiator further comprises a third radiation branch connected with the second radiation branch; both ends of the second radiation branch are connected with the third radiation branch, and the third radiation branch is arranged at a preset angle relative to the second radiation branch.
[0012] With reference to the first possible implementation manner of the first aspect, in a seventh possible implementation manner of the first aspect, the radiator further comprises a third radiator symmetrically arranged with the second radiator; the third radiator comprises a fourth radiation branch symmetric with the first radiation branch, and a fifth radiation branch symmetric with the second radiation branch.
[0013] With reference to the seventh possible implementation manner of the first aspect, in an eighth possible implementation manner of the first aspect, the base layer comprises a first area and a second area symmetrically arranged, the first radiator and the second radiator are arranged in the first area, and the third radiator is arranged in the second area.
[0014] In the second aspect, the utility model further provides an electronic tag, and the electronic tag is provided with the slot antenna.
[0015] The utility model has the following beneficial effects:
[0016] The slot antenna and the electronic tag provided by the embodiment of the utility model, including base layer, and the radiating body and the chip set on the surface of the base layer in the slot antenna, the radiating body is the slot radiating body, and the chip is matched with the radiating body, the slot radiating body includes the first radiating body and the second radiating body, the first radiating body constitutes the annular area, the chip is set in the annular area, the second radiating body is set outside the annular area, and the impedance adjustment of the slot antenna can be realized through the annular area, and then the matching loss between the antenna and the chip is reduced, and the problem that the radiation pattern is distorted can be effectively alleviated.
[0017] Other features and advantages of the utility model will be set forth in the subsequent description, and, partially, become obvious from the description, or understand by implementing the utility model. The purpose and other advantages of the utility model are realized and obtained in the structure that is specially pointed out in the description, the claims and the drawings.
[0018] In order to make the above purpose, features and advantages of the utility model more obvious and easy to understand, the following preferred embodiments are specifically described, and the accompanying drawings are combined as follows. BRIEF DESCRIPTION OF DRAWINGS
[0019] In order to more clearly illustrate the specific embodiment of the utility model or the technical scheme in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiment or the prior art description, obviously, the drawings in the following description are some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creating creative labor.
[0020] Figure 1 It is a radiation schematic diagram;
[0021] Figure 2 It is a structural schematic diagram of a slot antenna provided by the embodiment of the utility model;
[0022] Figure 3 It is a structural schematic diagram of another slot antenna provided by the embodiment of the utility model;
[0023] Figure 4 It is a radiation schematic diagram of an electronic tag provided by the embodiment of the utility model.
[0024] Reference signs: 201-base layer;202-chip;203-first radiation branch;204-second radiation branch;205-first radiation part;206-second radiation part;207-third radiation part;208-third radiation branch;209-fourth radiation part;301-fourth radiation branch;302-fifth radiation branch;303-radiation branch. DETAILED DESCRIPTION
[0025] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme of the utility model will be described clearly and completely below in combination with the drawings. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor belong to the protection scope of the utility model.
[0026] At present, when the RFID tag is used on the windshield of the automobile, due to the high dielectric constant of the glass, the reading performance of the RFID tag in the front is not good, but the reading performance in the side is very good, which has a negative impact on the effect that the design wants to achieve. Because the RFID reader is generally arranged in the front of the automobile, the maximum radiation pattern of the RFID tag should be towards the front of the automobile, so that the RFID reader can easily read the tag, thereby completing a series of operations such as payment and lifting of the rod.
[0027] However, due to the high dielectric constant of the glass, the radiation pattern of the RFID tag is distorted, so that the maximum radiation pattern of the RFID tag is along the glass surface, and the maximum radiation direction is formed to the left and right sides along the polarization direction of the tag, as shown in the RFID tag radiation pattern and simulation schematic diagram. Figure 1 As shown in the RFID tag radiation pattern and simulation schematic diagram, the left side (a) is the RFID tag radiation pattern, and the right side (b) is the simulation schematic diagram.
[0028] As shown in the RFID tag radiation pattern and simulation schematic diagram, the left side (a) is the RFID tag radiation pattern, and the right side (b) is the simulation schematic diagram. Figure 1 As can be seen, the radiation pattern is distorted, resulting in the maximum radiation direction to the left and right sides.
[0029] Moreover, the distortion of the above radiation pattern will cause the following phenomenon: due to the multipath effect of electromagnetic waves, the RFID reader in the front of the vehicle lane does not read the tag, while the RFID reader in the next lane reads the tag. For example, in the application scene of needing to charge and lift the rod, misoperation is easy to occur, and the user experience is reduced.
[0030] In addition, with the development of RFID technology, the performance of the electronic tag is more and more perfect. In the design scheme of the electronic tag antenna adopting the slot antenna, because the impedance of the dipole antenna is generally 73Ω, and the chip of the RFID is generally a complex impedance, if the design scheme of the dipole is directly adopted, then there is also a matching loss at the antenna port.
[0031] Based on this, the slot antenna and the electronic tag provided by the embodiments of the utility model can adjust the radiation pattern of the slot antenna or the electronic tag, so as to adjust the radiation pattern to be towards the front, and thus alleviate the above technical problems.
[0032] For the purpose of facilitating the understanding of the present embodiment, first of all, a kind of slot antenna disclosed in the utility model embodiment is introduced in detail.
[0033] In one possible implementation, the utility model embodiment provides a kind of slot antenna, the slot antenna includes base layer, and the radiating body and chip of setting in the surface of base layer;Wherein, the base layer is generally metal layer or conductor surface, generally set on substrate;Further, the radiating body in the utility model embodiment is slot radiating body, and chip is matched with radiating body;Slot radiating body includes first radiating body and second radiating body;First radiating body constitutes annular region, above-mentioned chip is arranged in annular region interior, second radiating body is arranged in annular region exterior.
[0034] For the purpose of facilitating the understanding, Figure 2 The structure of a kind of slot antenna is shown, including base layer 201, chip 202, and the specific structure of first radiating body and second radiating body.
[0035] Specifically, the above-mentioned second radiating body includes first radiating branch 203 and second radiating branch 204.First radiating body is arranged at one end of first radiating branch 203, and second radiating branch 204 is arranged at the other end of first radiating branch 203;And, second radiating branch 204 and first radiating branch 203 are arranged at preset angle.
[0036] In actual use, the above-mentioned second radiating branch 204 and first radiating branch 203 generally constitute T type structure, i.e., Figure 2 The T type structure shown, that is, second radiating branch 204 and first radiating branch 203 are arranged at 90 degrees angle.This T type structure design mode can increase radiation resistance, to improve the gain of entire slot antenna.
[0037] And, to make the above-mentioned first radiating body constitute annular region, as Figure 2 As shown, the above-mentioned first radiating body includes first radiating part 205 and second radiating part 206;First radiating part 205 is connected with one end of first radiating branch 203;Two ends of first radiating part 205 are symmetrically provided with second radiating part 206, and one end of second radiating part 206 is connected with first radiating part 205, the other end of second radiating part 206 extends in the direction away from first radiating part 205, to constitute annular region.
[0038] And, the first radiation part and the second radiation part included in the first radiator can adopt an integrated design, and when connected with the second radiator, can also adopt an integrated design, and the side length of the annular region formed by the first radiator, that is, the length of the first radiation part 205 and the second radiation part 206, and the length of the first radiation branch 203 and the second radiation branch 204 included in the second radiator can be set according to the actual use of the radiation impedance.
[0039] In actual use, the annular region formed by the first radiator also acts as a matching ring matched with the chip, for reducing the matching loss between the whole slot antenna and the chip, and also for adjusting the real and imaginary part impedance of the slot antenna.
[0040] Further, the matching ring can belong to a part of the slot antenna, and thus is designed by a conductor, and the size thereof is related to the impedance of the chip, and generally is mostly square, such as Figure 2 as shown, the square is preferred in the embodiment of the utility model, and in other embodiments, can also be circular or other irregular shapes, and the purpose is to better feed energy to the radiation parts on both sides. Generally, the greater the equivalent capacitance of the chip, the greater the area surrounded by the matching ring, that is, the annular region.
[0041] Further, the annular region in the embodiment of the utility model further comprises a third radiation part. Figure 2 as shown, the third radiation part 207 is arranged inside the annular region, and the outer edge of the third radiation part 207 is arranged at a preset distance from the inner edge of the first radiator. That is, the first radiation part 205 and the second radiation part 206 included in the first radiator are both at a preset distance from the first radiation part 205 and the second radiation part 206 to form a parasitic capacitance between the first radiation part 205 and the second radiation part 206.
[0042] Further, the first radiator further comprises a fourth radiation part, and the fourth radiation part is arranged at one end of the second radiation part 206 away from the first radiation part 205. Figure 2 as shown, two fourth radiation parts 209 are shown, and the fourth radiation part 209 is actually a part of the annular region, and the length thereof can be set according to actual use to adjust or match the impedance of the whole slot antenna.
[0043] Further, the second radiator further comprises a third radiation branch 208 connected with the second radiation branch 204; wherein the two ends of the second radiation branch 204 are both connected with the third radiation branch, and the third radiation branch is arranged at a preset angle relative to the second radiation branch.
[0044] Specifically, asFigure 2 As shown in the above, one end of the third radiation branch 208 is connected with the second radiation branch 204, and the whole of the third radiation branch 208 is arranged perpendicularly with the second radiation branch, that is, arranged at 90 degrees. And the third radiation branch 208 is symmetrically arranged at both ends of the second radiation branch 204. In actual use, the third radiation branch 208 can also realize the adjustment or matching of the impedance of the whole slot antenna, and thus the specific length thereof can be set according to actual use, and the embodiments of the present application do not limit this.
[0045] Further, in the embodiments of the present application, the above radiation body further comprises a third radiation body symmetrically arranged with the second radiation body.
[0046] Specifically, the above base layer comprises a first region and a second region symmetrically arranged, the above first radiation body and the second radiation body are arranged in the first region, and the above third radiation body is arranged in the second region.
[0047] For the convenience of understanding, on the basis of the above Figure 2 , Figure 3 another structure diagram of a slot antenna is further shown. In the above Figure 3 , the above base layer is divided into a first region and a second region, specifically, the right side is the first region and the left side is the second region.
[0048] Therefore, the above Figure 2 each structure shown in the above is arranged on the right side of the base layer, and the above third radiation body is arranged on the left side of the base layer. And Figure 3 , the fourth radiation branch 301 and the fifth radiation branch 302 are further shown in the above
[0049] In actual use, corresponding to the above second radiation body, the fourth radiation branch 301 and the fifth radiation branch 302 of the above third radiation body are also arranged at a preset angle, such as Figure 3 the T-shaped structure shown in the above, and the two ends of the fifth radiation branch 302 can also symmetrically arrange the third radiation branch 208, and further symmetrically arrange the second radiation branch.
[0050] In addition, a corresponding radiation branch can also be arranged on the side of the fourth radiation branch 301 close to the first radiation body, which can be used for adjusting the impedance of the slot antenna. Such as Figure 3 the radiation branch 303 and the like, and the specific size thereof can be set according to actual use, and the embodiments of the present application do not limit this.
[0051] Further, the embodiments of the present application further provide an electronic tag, which is configured with the above slot antenna.
[0052] In a specific implementation, the electronic tag can be applied to an automobile windshield glass, for example, the slot antenna is embedded into the RFID tag, and a high-performance RFID tag for the automobile windshield glass is designed.
[0053] In addition, the electronic tag can also be applied to high-dielectric articles such as ceramics or bottles containing liquid, and maintains good performance.
[0054] Further, Figure 4 A radiation schematic diagram of the electronic tag is also shown, wherein, Figure 4 (a) of the figure is a radiation pattern diagram of the electronic tag configured with the slot antenna, and Figure 4 (b) is a simulation schematic diagram, and Figure 4 In the electronic tag is applied to the automobile windshield glass.
[0055] By Figure 4 It can be seen that the maximum radiation pattern of the electronic tag is above and below the glass, and the radiation gain on both sides is small. In actual use, considering that the electronic tag is generally attached to the inside of the automobile windshield glass, and the RFID reader is generally outside, the gain requirement of the electromagnetic wave penetrating the glass after the antenna of the electronic tag is higher, and the slot antenna and the electronic tag provided by the embodiment of the utility model meet the requirement.
[0056] The electronic tag provided by the embodiment of the utility model has the same technical features as the slot antenna provided by the above embodiment, so it can also solve the same technical problems and achieve the same technical effects.
[0057] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific implementation process of the electronic tag described above can refer to the corresponding process in the foregoing embodiments, which will not be repeated here.
[0058] In addition, in the description of the embodiment of the utility model, unless otherwise explicitly specified and limited, the terms "mounting", "connection" and "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.
[0059] In the description of the utility model, it is necessary to explain that the orientation or position relation indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like is the orientation or position relation based on the orientation or position relation shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.
[0060] Finally, it should be noted that: the above examples are only specific embodiments of the utility model, which are used to illustrate the technical solutions of the utility model, and are not limited thereto, and the protection scope of the utility model is not limited thereto. Although the utility model has been described in detail with reference to the foregoing examples, those skilled in the art should understand that any person skilled in the art within the technical range disclosed by the utility model can modify or easily think of changes to the technical solutions recorded in the foregoing examples, or make equivalent replacement to some technical features thereof; and these modifications, changes or replacements do not make the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the utility model, and should be covered within the protection scope of the utility model. Therefore, the protection scope of the utility model should be subject to the protection scope of the claims.
Claims
1. A slot antenna, characterized by The slot antenna comprises a base layer, and a radiator and a chip arranged on the surface of the base layer; The radiator is a slot radiator, and the chip is matched with the radiator; The slot radiator comprises a first radiator and a second radiator; The first radiator forms a ring-shaped area, the chip is arranged inside the ring-shaped area, and the second radiator is arranged outside the ring-shaped area.
2. The slot antenna according to claim 1, characterized in that The second radiator comprises a first radiation branch and a second radiation branch; The first radiator is arranged at one end of the first radiation branch, and the second radiation branch is arranged at the other end of the first radiation branch; And the second radiation branch and the first radiation branch are arranged at a preset angle.
3. The slot antenna according to claim 2, characterized in that The second radiation branch and the first radiation branch form a T-shaped structure.
4. The slot antenna according to claim 2, characterized in that The first radiator comprises a first radiation part and a second radiation part; The first radiation part is connected with one end of the first radiation branch; Both ends of the first radiation part are symmetrically provided with the second radiation part, one end of the second radiation part is connected with the first radiation part, and the other end of the second radiation part extends away from the first radiation part to form the ring-shaped area.
5. The slot antenna according to claim 4, characterized in that The ring-shaped area is further provided with a third radiation part; The outer edge of the third radiation part is arranged at a preset distance from the inner edge of the first radiator.
6. The slot antenna according to claim 4, characterized in that The first radiator further comprises a fourth radiation part, and the fourth radiation part is arranged at one end of the second radiation part away from the first radiation part.
7. The slot antenna according to claim 2, characterized in that, The second radiator further comprises a third radiation branch connected with the second radiation branch; Both ends of the second radiation branch are connected with the third radiation branch, and the third radiation branch is arranged at a preset angle relative to the second radiation branch.
8. The slot antenna according to claim 2, characterized in that The radiator further comprises a third radiator arranged symmetrically with the second radiator; The third radiator comprises a fourth radiation branch symmetrically arranged with the first radiation branch, and a fifth radiation branch symmetrically arranged with the second radiation branch.
9. The slot antenna according to claim 8, characterized in that The base layer comprises a first area and a second area arranged symmetrically, the first radiator and the second radiator are arranged in the first area, and the third radiator is arranged in the second area.
10. An electronic tag, characterized by The electronic tag is provided with the slot antenna according to any one of claims 1-9.