An RFID low frequency antenna structure with a shielding layer
By introducing a shielding layer and gradient opening design into the RFID low-frequency antenna, the problem of poor shielding effect is solved, achieving effective shielding and prevention of eddy current loss, ensuring the normal operation of the chip.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- DONGGUAN YAFU INTELLIGENT TECHNOLOGY CO LTD
- Filing Date
- 2025-06-24
- Publication Date
- 2026-07-07
AI Technical Summary
Existing RFID low-frequency antennas have poor shielding performance during use, are easily interfered with, and cannot effectively prevent eddy current loss.
The RFID low-frequency antenna structure with a shielding layer is adopted, including a shielding mechanism and a gradient opening design. The magnetic field radiation pattern is shaped by an asymmetric involute linear opening. Combined with a dipole and a dipole matching loop, impedance matching of the chip bonding bit is ensured.
It achieves effective shielding to prevent eddy current loss, while also being compatible with different chips to ensure that the normal operation of the chips is not affected.
Smart Images
Figure CN224472701U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of RFID antenna technology, specifically to an RFID low-frequency antenna structure with a shielding layer. Background Technology
[0002] RFID low-frequency antennas typically operate in the 125kHz or 134.2kHz frequency band, with a wavelength of approximately 2400 meters (125kHz). They primarily transmit energy and communicate data through magnetic field coupling, and can penetrate non-metallic materials (water, wood, plastic, etc.), while being relatively insensitive to surrounding metallic and liquid environments.
[0003] The authorized publication number “CN209860908U” describes that “a shielded antenna (100) includes a helical antenna (110) and a shield (120) disposed on the helical antenna. The helical antenna includes a plurality of substantially concentric loops. The shield includes a plurality of electrically isolated conductive segments forming a regular pattern such that, in a top plan view, at least one segment overlaps with a portion of at least two loops, and at least one pair of adjacent conductive segments defines an electrically insulating gap therebetween.”
[0004] The aforementioned patent describes a pattern in which multiple electrically isolated conductive segments form a regular pattern, such that in a top view, at least one segment overlaps with a portion of at least two loops, and at least one pair of adjacent conductive segments define an electrically insulating gap between them. However, during use, the shielding effect of the antenna cannot be guaranteed, nor can it be guaranteed that the antenna will not be interfered with during use. Utility Model Content
[0005] This invention provides an RFID low-frequency antenna structure with a shielding layer. By using the antenna mechanism, different chips can be matched. The chip bonding position of the antenna structure is designed by impedance matching, and it will not affect the bonded chip. By using the shielding mechanism, an asymmetric involute linear opening design is adopted instead of a traditional straight opening, so as to achieve controllable shaping of the magnetic field radiation pattern and prevent eddy current loss.
[0006] To achieve the above objectives, this utility model provides the following technical solution: an RFID low-frequency antenna structure with a shielding layer, comprising:
[0007] Substrate;
[0008] An antenna mechanism, disposed within a substrate, includes a mounting component, an information recording chip, and a low-frequency RFID antenna. The mounting component is disposed within the substrate, and the low-frequency RFID antenna is mounted on the mounting component. The information recording chip is mounted on the low-frequency RFID antenna.
[0009] The shielding mechanism is provided in two sets, both sets of the shielding mechanism are provided on the substrate, and each set of the shielding mechanism includes a shielding layer and a gradient opening, the shielding layer is provided on the substrate, and the gradient opening is formed on the shielding layer.
[0010] Furthermore, the mounting component includes a positioning plate and a snap-fit frame, wherein the positioning plate is fixedly connected to the substrate and the snap-fit frame is formed on the positioning plate.
[0011] Furthermore, an upper protective sheet is fixedly connected to the top of the substrate, and a lower protective sheet is fixedly connected to the bottom of the substrate.
[0012] Furthermore, the low-frequency RFID antenna includes a dipole and a dipole matching ring, the dipole matching ring being provided with a binding position, and the dipole and the dipole matching ring forming an internal space.
[0013] Furthermore, the low-frequency RFID antenna has at least two sequentially arranged chip bonding positions, each chip bonding position corresponding to a different impedance value of the chip, and the at least two chip bonding positions are sequentially arranged along the longitudinal direction of the low-frequency RFID antenna.
[0014] This invention provides an RFID low-frequency antenna structure with a shielding layer. It has the following advantages:
[0015] (1) The shielded RFID low-frequency antenna structure can be matched with different chips through the use of the antenna mechanism. The chip bonding position of the antenna structure is designed by impedance matching, and it will not affect the bonded chip.
[0016] (2) The shielded RFID low-frequency antenna structure adopts an asymmetric involute linear opening design instead of a traditional straight opening through the use of a shielding mechanism, so as to achieve controllable shaping of the magnetic field radiation pattern and prevent eddy current loss. Attached Figure Description
[0017] Figure 1 This is an exploded cross-sectional view of the present invention;
[0018] Figure 2 This is an exploded view of the present invention;
[0019] Figure 3 This is a partial sectional view of the present invention;
[0020] Figure 4 This is a perspective view of the present invention.
[0021] In the diagram: 1. Substrate; 2. Upper protective sheet; 3. Information recording chip; 4. Shielding layer; 5. Gradient opening; 6. Positioning plate; 7. Snap-fit frame; 8. Low-frequency RFID antenna; 9. Lower protective sheet. Detailed Implementation
[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.
[0023] Please see Figure 1-4 This utility model provides a technical solution: an RFID low-frequency antenna structure with a shielding layer, characterized in that it includes:
[0024] Substrate 1;
[0025] An antenna mechanism, disposed within a substrate 1, includes a mounting component, an information recording chip 3, and a low-frequency RFID antenna 8. The mounting component is disposed within the substrate 1, the low-frequency RFID antenna 8 is mounted on the mounting component, and the information recording chip 3 is mounted on the low-frequency RFID antenna 8.
[0026] The shielding mechanism is provided in two sets, both of which are located on the substrate 1. Each set of shielding mechanisms includes a shielding layer 4 and a gradient opening 5. The shielding layer 4 is located on the substrate 1, and the gradient opening 5 is located on the shielding layer 4.
[0027] In this implementation scheme: the information recording chip 3 and the low-frequency RFID antenna 8 are applications of existing technology, which will not be elaborated on here. However, the number and method of using the information recording chip 3 have been changed to provide flexibility in the use process. The opening width of the gradient opening 5 changes linearly or non-linearly from one end to the other end, and the height difference between the two ends is 0.5 to 3 mm, so as to realize the controllable shaping of the magnetic field radiation pattern and prevent the formation of closed loops that lead to eddy current loss. The low-frequency RFID antenna 8 is made of multiple turns of enameled wire, usually circular or rectangular. The wire diameter and number of turns are designed according to the specific application requirements, and the winding method can be single layer or multiple layers.
[0028] Specifically, the mounting components include a positioning plate 6 and a snap-fit frame 7. The positioning plate 6 is fixedly connected to the substrate 1, and the snap-fit frame 7 is formed on the positioning plate 6.
[0029] In this embodiment, the positioning plate 6 and the snap-fit frame 7 cooperate with each other to stably install the low-frequency RFID antenna 8 inside the substrate 1.
[0030] Specifically, an upper protective sheet 2 is fixedly connected to the top of the substrate 1, and a lower protective sheet 9 is fixedly connected to the bottom of the substrate 1.
[0031] In this embodiment, the upper protective sheet 2 and the lower protective sheet 9 work together to complete the protection and restriction on both sides of the substrate 1.
[0032] Specifically, the low-frequency RFID antenna 8 includes a dipole and a dipole matching ring. The dipole matching ring is provided with a binding position, and the dipole and the dipole matching ring form an internal space.
[0033] Specifically, the low-frequency RFID antenna 8 has at least two sequentially arranged chip bonding positions, each chip bonding position corresponds to a different impedance value of the chip, and the at least two chip bonding positions are arranged sequentially along the longitudinal direction of the low-frequency RFID antenna 8.
[0034] When in use, the entire device is installed in the usage position. The low-frequency RFID antenna 8 is used by adjusting the internal information recording chip 3. During use, the shielding layer 4 and the gradient opening 5 work together to prevent eddy current loss.
[0035] The control method of this utility model is to control the device by manually starting and stopping the switch. The wiring diagram of the power element and the supply of power are common knowledge in the field. Since this utility model is mainly used to protect mechanical devices, the control method and wiring layout will not be explained in detail.
[0036] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.
Claims
1. A low-frequency RFID antenna structure with a shielding layer, characterized in that, include: Substrate (1); An antenna mechanism is disposed within a substrate (1). The antenna mechanism includes a mounting component, an information recording chip (3), and a low-frequency RFID antenna (8). The mounting component is disposed within the substrate (1), the low-frequency RFID antenna (8) is disposed on the mounting component, and the information recording chip (3) is disposed on the low-frequency RFID antenna (8). The shielding mechanism is provided in two sets, both sets of the shielding mechanism are provided on the substrate (1), each set of the shielding mechanism includes a shielding layer (4) and a gradient opening (5), the shielding layer (4) is provided on the substrate (1), and the gradient opening (5) is opened on the shielding layer (4).
2. The RFID low-frequency antenna structure with a shielding layer according to claim 1, characterized in that, The mounting components include a positioning plate (6) and a snap-fit frame (7). The positioning plate (6) is fixedly connected to the substrate (1), and the snap-fit frame (7) is formed on the positioning plate (6).
3. The RFID low-frequency antenna structure with a shielding layer according to claim 2, characterized in that, The top of the substrate (1) is fixedly connected to an upper protective sheet (2), and the bottom of the substrate (1) is fixedly connected to a lower protective sheet (9).
4. The RFID low-frequency antenna structure with a shielding layer according to claim 3, characterized in that, The low-frequency RFID antenna (8) includes a dipole and a dipole matching ring. The dipole matching ring is provided with a binding position. The dipole and the dipole matching ring form an internal space.
5. The RFID low-frequency antenna structure with a shielding layer according to claim 4, characterized in that, The low-frequency RFID antenna (8) has at least two sequentially arranged chip bonding positions, each chip bonding position corresponding to a different impedance value of the chip, and the at least two chip bonding positions are arranged sequentially along the longitudinal direction of the low-frequency RFID antenna (8).