A resonant frequency-selectable high-frequency RFID tag antenna

Abstract

The utility model relates to a kind of resonant frequency selectable high-frequency RFID label antenna. Including bearing substrate, coil and chip, the coil and chip are respectively arranged on bearing substrate surface, the window is opened in the middle of the bearing substrate, the window is equipped with several chip mounting points, the coil both ends are connected with the antenna port of chip. The utility model places position by selecting different chip, so that the design inductance of antenna is different, so that the resonant frequency of label antenna is different, to achieve the selectability of resonant frequency.

Description

Technical Field

[0001] This utility model relates to a tag antenna, and more particularly to a high-frequency RFID tag antenna with selectable resonant frequency. Background Technology

[0002] The performance of a label is affected by the object it is affixed to, causing its resonant frequency to change. The change is as follows: f is the final resonant frequency of the RFID tag; f c ε represents the resonant frequency of the RFID tag when it is not attached to the object; ε is the dielectric constant of the object. The standard frequency for high-frequency RFID tags is 13.56MHz. However, the resonant frequency of high-frequency RFID tags may differ significantly from 13.56MHz depending on the application scenario, affecting usability. Even when using antennas of the same size for different applications, the tag antenna design needs to be readjusted to ensure the resonant frequency of the high-frequency RFID tag antenna is at 13.56MHz, increasing design costs and making it inconvenient to prepare inventory in advance.

[0003] The performance of a high-frequency RFID tag antenna is determined by the chip, the thickness of the front and back coils, and the coil spacing. The chip specifications are determined by the application. Therefore, if the appearance of the fixed antenna is fixed, the performance of the tag is also fixed. Utility Model Content

[0004] The purpose of this invention is to provide a high-frequency RFID tag antenna with a compact structure, selectable resonant frequency, wide applicability, and cost-effective production, in order to solve the problems in the prior art.

[0005] The technical solution of this utility model is: a high-frequency RFID tag antenna with selectable resonant frequency, including a carrier substrate, a coil and a chip. The coil and the chip are respectively disposed on the surface of the carrier substrate. The carrier substrate has a window in the middle, and the window is provided with a plurality of chip mounting points. The two ends of the coil are connected to the antenna ports of the chip.

[0006] Furthermore, the window has four chip mounting points.

[0007] Furthermore, the multiple chip mounting points are arranged in a straight line within the rectangular window.

[0008] Furthermore: the coil includes a back coil and a front coil, which are connected together.

[0009] Furthermore, the chip mounting points are evenly spaced on the carrier substrate.

[0010] The beneficial effects of this utility model are: by selecting different chip placement positions, this utility model can make the design inductance value of the antenna different, thereby making the resonant frequency of the tag antenna different, thus achieving selectivity of the resonant frequency. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of this utility model.

[0012] Figure 2 This is a comparison chart showing the size of the inner ring of the rectangular coil corresponding to different chip mounting points.

[0013] Figure 3 This is a schematic diagram of the existing technology.

[0014] In the diagram, A, A1, A2, A3, and A4 are chip mounting points, B is the back coil, C is the front coil, D is the connection point between the front and back coils, and E is the chip. Detailed Implementation

[0015] A high-frequency RFID tag antenna with selectable resonant frequency includes a carrier substrate, a coil, and a chip. The coil and the chip are respectively disposed on the surface of the carrier substrate. The carrier substrate has a window in the middle, and the window is provided with a plurality of chip mounting points. The two ends of the coil are connected to the antenna ports of the chip.

[0016] Furthermore, the window has four chip mounting points.

[0017] Furthermore, the multiple chip mounting points are arranged in a straight line within the rectangular window.

[0018] Furthermore: the coil includes a back coil and a front coil, which are connected together.

[0019] Furthermore, the chip mounting points are evenly spaced on the carrier substrate.

[0020] The working principle of this invention is as follows: Multiple chip placement positions are added, and the coil size differs for each different chip placement position. Therefore, different chip placement positions result in different coil sizes for the antenna during operation. Different coil sizes correspond to different antenna inductance values, thus affecting the resonant frequency of the high-frequency RFID tag. L is the design inductance value of the antenna (different coil sizes correspond to different inductance values); C is the capacitance value of the chip used (including the parasitic capacitance of the chip and antenna combination, which is very small and relatively stable) and is relatively fixed, with a fixed influence on the resonant frequency.

[0021] The inductance L of the high-frequency RFID antenna decreases from A1 to A4, corresponding to the antenna resonant frequency f. cAs the dielectric constant ε of the material increases, the resonant frequency f when attached to the specific application material will also increase. With a larger dielectric constant ε, we can choose a chip placement position with a smaller inductance value (e.g., A4). With a smaller dielectric constant ε, the dielectric constant ε of the material will also increase.

[0022] During production, different chips are selected and placed according to different application scenarios to generate different resonant frequencies to meet the application scenarios, which can improve delivery efficiency.

[0023] In this utility model, unless otherwise explicitly specified and limited, for example, it can be a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components or an interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0024] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-frequency RFID tag antenna with selectable resonant frequency, characterized in that: The device includes a carrier substrate, a coil, and a chip. The coil and the chip are respectively disposed on the surface of the carrier substrate. The carrier substrate has a window in the middle, and the window has several chip mounting points. The two ends of the coil are connected to the antenna ports of the chip.

2. The high-frequency RFID tag antenna with selectable resonant frequency according to claim 1, characterized in that: The window has four chip mounting points.

3. The high-frequency RFID tag antenna with selectable resonant frequency according to claim 1, characterized in that: The multiple chip mounting points are arranged in a straight line within a rectangular window.

4. The high-frequency RFID tag antenna with selectable resonant frequency according to claim 1, characterized in that: The coil includes a back coil and a front coil, which are connected together.

5. A high-frequency RFID tag antenna with selectable resonant frequency according to claim 1 or 2, characterized in that: The chip mounting points are arranged at equal intervals on the carrier substrate.

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