UHF electronic tag antenna and UHF electronic tag
By adopting a feeding ring with a double-wire helical structure and a spiral oscillator antenna in the UHF electronic tag antenna, the problem of insufficient feeding capacity in the miniaturization process is solved, and faster read and write response is achieved Speed and longer read and write distances.
Patent Information
- Application Number
- CN202420311989.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-02-20
- Publication Date
- 2025-02-11
- Estimated Expiration
- 2034-02-20
AI Technical Summary
During the miniaturization process of existing UHF electronic tags, the reduction of the feeding loop and dipole antenna leads to insufficient feeding capacity, insufficient reading and writing distance, and slow response speed.
A UHF electronic tag antenna is designed, using a feeding ring with a double-wire helical structure and a spiral oscillator antenna. By optimizing the loop structure of the feeding ring and the structure of the oscillator antenna, the electrical length and omnidirectionality of the antenna are improved.
In a limited space, the electrical length of the feeding ring is increased, the read and write response speed of the electronic tag is improved, and the reading and writing distance and response speed requirements of the miniaturized UHF electronic tag are met.
Smart Images
Figure CN222463431U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of RFID electronic tags, in particular to a miniaturized UHF electronic tag antenna and a UHF electronic tag. Background Art
[0002] With the popularity of RFID electronic tags, more and more commodities are beginning to use electronic tags for identification. The working frequency bands of RFID electronic tags include low frequency LF, high frequency HF, ultra-high frequency UHF and ultra-high frequency SHF. RFID electronic tags in the UHF band usually include a feed ring composed of a single ring and a dipole antenna with a serpentine structure, which has the characteristics of small size and long reading and writing distance. Under the condition that the total length of the antenna is less than 20mm, the UHF electronic tag of this structure needs to be bent many times to reach the resonance point, so as to increase the electrical length of the antenna. Since the more bends, the greater the energy loss of the antenna, the tag performance is often poor and cannot meet the reading requirements. When applied to some small-sized commodities, the size of conventional UHF electronic tags is still too large. Forcibly reducing the size of the feed ring and the dipole antenna will have the following problems: insufficient feeding capacity, insufficient reading and writing distance, slow response speed and other problems. Utility Model Content
[0003] In order to solve the above problems in the prior art, the utility model provides a UHF electronic tag antenna and an electronic tag to meet the miniaturization requirements of UHF electronic tags and improve the problems of insufficient reading and writing distance and slow response speed existing in small-sized UHF electronic tags.
[0004] The technical solution is as follows:
[0005] A UHF electronic tag antenna comprises a feeding ring for supplying power to a chip, and a dipole antenna extending from the feeding ring to both sides, wherein the feeding ring comprises a first connecting portion and a second connecting portion connected in series, wherein the first connecting portion and the second connecting portion partially constitute a double-wire helical structure, wherein the connecting point between the first connecting portion and the second connecting portion is the starting point of the double-wire helical structure, and the closer to the connecting point, the smaller the line spacing between the first connecting portion and the second connecting portion.
[0006] Furthermore, the double-helix structure includes a plurality of parallel fold lines, and the minimum line spacing between the parallel fold lines is 0.2 mm.
[0007] Furthermore, the line width of the feeding loop is between 0.2 mm and 0.5 mm.
[0008] Furthermore, the width of the dipole antenna is not less than the width of the feeding ring.
[0009] Furthermore, the structure of the dipole antenna is spiral.
[0010] Furthermore, the line width of the vibrator antenna is between 0.2 mm and 0.5 mm, and the line spacing of the vibrator antenna is between 0.2 mm and 0.5 mm.
[0011] Furthermore, the total width of the UHF electronic tag antenna is 8 mm and the total length is 18 mm.
[0012] The utility model also provides a UHF electronic tag, and the technical solution is as follows:
[0013] A UHF electronic tag comprises a metal layer and a dielectric layer, and the UHF electronic tag antenna as described above is formed on the metal layer.
[0014] Furthermore, the metal layer is made of copper or aluminum.
[0015] Furthermore, the material of the medium layer is paper or plastic.
[0016] The utility model achieves the following technical effects:
[0017] The utility model optimizes the ring structure of the feed ring, can increase the electrical length of the feed ring in a limited space, when reading and writing UHF electronic tags, the chip can obtain energy more quickly through the feed ring, and improves the reading and writing response speed of the electronic tag. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 It is an embodiment of the UHF electronic tag antenna in the prior art;
[0019] Figure 2 It is the equivalent circuit diagram of the UHF electronic tag antenna;
[0020] Figure 3 It is an embodiment of the UHF electronic tag antenna of the utility model. DETAILED DESCRIPTION
[0021] To further illustrate the various embodiments, the present invention provides drawings. These drawings are part of the disclosure of the present invention, which are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, a person of ordinary skill in the art should be able to understand other possible implementations and advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.
[0022] The utility model is now further described in conjunction with the accompanying drawings and specific implementation methods.
[0023] like Figure 1As shown, the utility model provides an embodiment of a miniaturized UHF electronic tag antenna. The UHF electronic tag antenna includes a feed ring 2 for connecting a chip 1, and a dipole antenna 3 extending outward from both sides of the feed ring 2. Figure 2 The equivalent circuit diagram shown in FIG. 1 shows that the UHF electronic tag antenna of this embodiment can be regarded as a coupled coil. According to Ampere's law, when current flows through a conductor, a magnetic field will be generated around the conductor, and the magnetic field induction intensity is proportional to the number of coil turns and the coil area. According to Thomson's formula It can be seen that the resonant frequency of the antenna and the inductance L ant , capacitor C ant The inductance L of the antenna can be adjusted by adjusting the number of turns, coil area, gap, etc. ant and capacitor C ant .
[0024] According to the equivalent circuit diagram, when the antenna impedance matches the chip impedance, the energy transfer reaches the maximum. Therefore, the antenna impedance is matched with the chip impedance by adjusting the capacitance and inductance of the antenna.
[0025] The main technical innovations are as follows:
[0026] 1. In this embodiment, the feed loop 2 adopts a turn structure. The specific structural features of the turn structure are: the feed loop 2 includes a first connection portion 21 and a second connection portion 22 connected in series, the first connection portion 21 and the second connection portion 22 partially constitute a double-line helical structure 23, the connection point 24 of the first connection portion 21 and the second connection portion 22 is the starting point of the double-line helical structure 23, and the closer to the connection point 24, the smaller the line spacing between the first connection portion 21 and the second connection portion 22.
[0027] In this embodiment, the double helical structure 23 includes a plurality of parallel fold lines. The fold line design facilitates the control of the line width of the first connecting portion 21 and the second connecting portion 22 in the double helical structure.
[0028] In this embodiment, in the double-line helical structure 23, the line widths of the first connecting portion 21 and the second connecting portion 22 are both 0.3 mm; and the minimum line spacing between the parallel fold lines is 0.3 mm.
[0029] The winding structure can realize the miniaturization of the feed ring. In the same space, the electrical length of the feed ring can be increased compared with a single-ring feed ring, so that when reading and writing UHF electronic tags, the chip can obtain energy faster through the feed ring, thereby improving the read and write response speed of the electronic tag.
[0030] 2. In this embodiment, the dipole antennas 3 on both wings of the UHF electronic tag antenna are designed as helical antennas. Compared with the commonly used serpentine antenna, the helical antenna can complete the distribution of antennas of the same length in a smaller space and has good omnidirectionality.
[0031] Preferably, in order to ensure the omnidirectionality of the UHF electronic tag antenna, the helical antennas on both wings of the UHF electronic tag antenna are arranged in mirror symmetry.
[0032] The width H1 of the dipole antenna 3 is the total width of the UHF electronic tag antenna.
[0033] In order to fully utilize the space of the electronic tag, the width H2 of the feeding ring 2 is the same as the width H1 of the dipole antenna 3 .
[0034] In this embodiment, a set of specific parameters when the electronic tag of this structure is applied to the UHF frequency band is given:
[0035] The total width H1 of the UHF electronic tag antenna is 8 mm, and the total length L1 is 18 mm.
[0036] The width H2 of the feed loop 2 is equal to the total width H1 of the UHF electronic tag antenna, and the width L2 is 8.2 mm. The line width W1 of the double-line helical portion is 0.3 mm, and the minimum value of the line spacing W2 is 0.3 mm.
[0037] The width of the oscillator antenna 3 is equal to the total width H1 of the UHF electronic tag antenna, the line width W3 of the oscillator antenna 3 is 0.3 mm, and the line spacing W4 is 0.3 mm.
[0038] like Figure 1 As shown, the utility model also provides a UHF electronic tag, including a chip 1, a metal layer and a dielectric layer. The UHF electronic tag antenna as described above is formed on the metal layer, the chip 1 is arranged at the opening of the feed ring 2, and the two electrodes of the chip 1 are electrically connected to the two ends 25 and 26 of the feed ring 2 respectively. When the reader performs a read and write operation on the UHF electronic tag, the feed ring 2 supplies power to the chip 1.
[0039] Preferably, the metal layer of the UHF electronic tag is made of copper or aluminum, and the surface of the dielectric layer is formed in the form of copper foil or aluminum foil.
[0040] Preferably, the medium layer is made of paper or plastic such as PET.
[0041] like Figure 3 As shown, the electronic tag is a UHF electronic tag. The central frequency band of the UHF electronic tag is about 950 MHz. In the range of 940 MHz to 960 MHz, the theoretical reading and writing distance can be close to 3 meters, which meets the requirements of practical applications.
[0042] Although the present invention has been specifically demonstrated and described in conjunction with the preferred embodiments, those skilled in the art should understand that various changes may be made to the present invention in form and detail without departing from the spirit and scope of the present invention as defined in the appended claims, all of which are within the scope of protection of the present invention.
Claims
1. A UHF electronic tag antenna, comprising a feeding ring for supplying power to a chip, and a dipole antenna extending from the feeding ring to both sides, characterized in that: The feeding ring includes a first connecting part and a second connecting part connected in series, and parts of the first connecting part and the second connecting part form a double-wire helical structure. The connecting point between the first connecting part and the second connecting part is the starting point of the double-wire helical structure. The closer to the connecting point, the smaller the line spacing between the first connecting part and the second connecting part.
2. The UHF electronic tag antenna according to claim 1, characterized in that: The double-helix structure includes a plurality of parallel fold lines, and the minimum line spacing between the parallel fold lines is 0.2 mm.
3. The UHF electronic tag antenna according to claim 1, characterized in that: The line width of the feeding loop is between 0.2 mm and 0.5 mm.
4. The UHF electronic tag antenna according to claim 1, characterized in that: The width of the feeding loop is equal to the width of the dipole antenna.
5. The UHF electronic tag antenna according to claim 1, characterized in that: The structure of the dipole antenna is spiral.
6. The UHF electronic tag antenna according to claim 1, characterized in that: The line width of the vibrator antenna is between 0.2 mm and 0.5 mm, and the line spacing of the vibrator antenna is between 0 mm and 0.5 mm.
7. The UHF electronic tag antenna according to claim 1, characterized in that: The total width of the UHF electronic tag antenna is 8 mm and the total length is 18 mm.
8. A UHF electronic tag, comprising a metal layer and a dielectric layer, characterized in that: The UHF electronic tag antenna as described in any one of claims 1 to 7 is formed on the metal layer.
9. The UHF electronic tag according to claim 8, characterized in that: The material of the metal layer is copper or aluminum.
10. The UHF electronic tag according to claim 8, characterized in that: The material of the medium layer is paper or plastic.