A metal-resistant radio frequency identification tag with an electro-reactive metasurface

Abstract

The present invention discloses an anti-metal wireless radio frequency identification tag with a reactance super surface, which belongs to the field of wireless radio frequency identification technology, and aims to solve the shortcomings of the prior art RFID tags in the aspects of poor signal and short reading distance in harsh and complex electromagnetic environments such as metal surfaces. It includes an RFID wireless radio frequency identification tag body, a metal ring is arranged on the dielectric plate of the RFID wireless radio frequency identification tag body, an antenna interface of an RFID chip is welded on the metal ring, an inductively coupled feeding dipole antenna of the metal ring, an end of the dipole antenna close to the metal ring is bent into an arc segment, the arc segment is annularly wrapped on the outside of the metal ring, and a reactance super surface is arranged below the RFID wireless radio frequency identification tag body. The reactance super surface includes a dielectric panel, a metal rectangular patch is arranged on the dielectric panel, a plurality of metal rectangular patches are arranged, and an array of metal rectangular patches is distributed on the dielectric panel. The present invention is applicable to wireless radio frequency identification tags.

Description

Technical Field

[0001] The invention belongs to the technical field of wireless radio frequency identification, and in particular relates to an anti-metal wireless radio frequency identification tag with an electrically reactive super surface. Background Art

[0002] Radio Frequency Identification (RFID) is considered to be one of the important building blocks of the Internet of Things system due to its advantages such as low cost, no battery required, high information accuracy, non-contact, and automatic information update. Radio Frequency Identification tags are usually composed of tag antennas and RFID radio frequency chips. Among them, the tag antenna plays a very important role in the entire RFID system as an energy and signal transceiver interface.

[0003] When an RFID tag is attached to metal, the metal will cause the incident electromagnetic wave and the reflected electromagnetic wave to differ by 180 degrees. The two will superimpose and cancel each other out at the metal, greatly reducing the signal strength and making the RFID tag undetectable. Traditional anti-metal tags generally use microstrip antennas, but due to the small bandwidth and low gain of microstrip antennas, they cannot bring good long-distance anti-metal reading effects overall. Summary of the invention

[0004] The purpose of the present invention is to provide an anti-metal wireless radio frequency identification tag with an electro-reactive super surface to solve the performance deficiencies of RFID tags in the prior art, such as poor signal and short reading distance in harsh and complex electromagnetic environments such as metal surfaces.

[0005] The technical solution adopted by the present invention is as follows:

[0006] A metal-resistant radio frequency identification tag with a reactance metasurface comprises an RFID radio frequency identification tag body, a metal ring is arranged on a dielectric plate of the RFID radio frequency identification tag body, an antenna interface of an RFID chip is welded on the metal ring, a dipole antenna is inductively coupled and fed on the metal ring, an end of the dipole antenna close to the metal ring is bent into an arc segment, the arc segment is annularly covered on the outside of the metal ring, and a reactance metasurface is arranged below the RFID radio frequency identification tag body.

[0007] Furthermore, the reactance metasurface includes a dielectric panel, on which a metal rectangular patch is arranged, and a plurality of the metal rectangular patches are arranged, and the metal rectangular patch array is distributed on the dielectric panel.

[0008] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0009] 1. In the present invention, the metal ring is welded to the antenna interface of the RFID chip to match the capacitive impedance component of the RFID chip. The metal ring is inductively coupled to feed the dipole antenna, and one end of the two arms of the dipole antenna is bent into an arc to increase the coupling efficiency with the metal ring. The reactance metasurface is a metal rectangular patch array arranged on a dielectric panel. When used, the reactance metasurface will be inserted between the RFID wireless radio frequency identification tag and the metal (supported by a suitable small object that does not affect the antenna performance). By adjusting the size of the metal rectangular patch, the number of patches, the distribution form and the distance between the RFID wireless radio frequency identification tag and the metal, the antenna of the RFID chip reaches the best state when close to the metal. This effectively changes the reflection phase of the electromagnetic wave, making the incident electromagnetic wave and the reflected electromagnetic wave coherent and constructive. At the same time, a new resonance point is introduced to compensate for the parasitic effect between the RFID wireless radio frequency identification tag and the metal, and the image current originally on the metal is dispersed, reducing the strong coupling between the original image current and the antenna of the RFID chip, effectively enhancing the performance of the RFID wireless radio frequency identification tag attached to the metal, and solving the problem that the existing RFID wireless radio frequency identification tag cannot be detected when it is attached to the metal. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and should not be regarded as limiting the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative work, among which:

[0011] Figure 1 It is a structural schematic diagram of the metal ring inductively coupled fed dipole antenna of the present invention;

[0012] Figure 2 It is a schematic diagram of the combination of the reactance super surface of the present invention with the RFID wireless radio frequency identification tag body and metal;

[0013] Markings in the figure: 1-RFID wireless radio frequency identification tag body, 2-metal ring, 3-antenna interface, 4-dipole antenna, 41-arc segment, 5-reactance metasurface, 51-metal rectangular patch. DETAILED DESCRIPTION

[0014] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0015] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0016] It should be noted that reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0017] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the invented product is usually placed when in use. They are only simplified descriptions for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the descriptions, and cannot be understood as indicating or implying relative importance.

[0018] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0019] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0020] A metal-resistant radio frequency identification tag with a reactance metasurface comprises an RFID radio frequency identification tag body, a metal ring is arranged on a dielectric plate of the RFID radio frequency identification tag body, an antenna interface of an RFID chip is welded on the metal ring, the metal ring is an inductively coupled feeding dipole antenna, one end of the dipole antenna close to the metal ring is bent into an arc segment, the arc segment is annularly covered on the outside of the metal ring, and a reactance metasurface is arranged below the RFID radio frequency identification tag body.

[0021] Furthermore, the reactance metasurface includes a dielectric panel, on which a metal rectangular patch is arranged, and a plurality of the metal rectangular patches are arranged, and the metal rectangular patch array is distributed on the dielectric panel.

[0022] During the implementation of the present invention, the metal ring is welded to the antenna interface of the RFID chip to match the capacitive impedance component of the RFID chip. The metal ring is inductively coupled to feed the dipole antenna, and one end of the two arms of the dipole antenna is bent into an arc to increase the coupling efficiency with the metal ring, change the reflection phase of the electromagnetic wave, and make the incident electromagnetic wave and the reflected electromagnetic wave coherent and constructive. The reactance metasurface is a metal rectangular patch array arranged on a dielectric panel. When used, the reactance metasurface will be inserted between the RFID wireless radio frequency identification tag and the metal (supported by a suitable small object that does not affect the antenna performance). By adjusting the size of the metal rectangular patch, the number of patches, the distribution method and the distance between the RFID wireless radio frequency identification tag and the metal, the antenna of the RFID chip reaches the best state when it is close to the metal. This effectively changes the reflection phase of the electromagnetic wave, making the incident electromagnetic wave and the reflected electromagnetic wave coherent and constructive. At the same time, a new resonance point is introduced to compensate for the parasitic effect between the RFID wireless radio frequency identification tag and the metal, and the image current originally on the metal is dispersed, reducing the strong coupling between the original image current and the antenna of the RFID chip, effectively enhancing the performance of the RFID wireless radio frequency identification tag attached to the metal, and solving the problem that the existing RFID wireless radio frequency identification tag cannot be detected when it is attached to the metal.

[0023] Example 1

[0024] A metal-resistant radio frequency identification tag with a reactance metasurface comprises an RFID radio frequency identification tag body, a metal ring is arranged on a dielectric plate of the RFID radio frequency identification tag body, an antenna interface of an RFID chip is welded on the metal ring, a dipole antenna is inductively coupled and fed on the metal ring, an end of the dipole antenna close to the metal ring is bent into an arc segment, the arc segment is annularly covered on the outside of the metal ring, and a reactance metasurface is arranged below the RFID radio frequency identification tag body.

[0025] Through this setting, the metal ring is welded to the antenna interface of the RFID chip to match the capacitive impedance component of the RFID chip. The metal ring is an inductively coupled fed dipole antenna. The reactance metasurface is a metal rectangular patch array arranged on a dielectric panel. When in use, the reactance metasurface will be inserted between the RFID wireless radio frequency identification tag and the metal (supported by a suitable small object that does not affect the antenna performance). By adjusting the size, number, distribution mode, and distance between the metal rectangular patch and the RFID wireless radio frequency identification tag and the metal, the antenna of the RFID chip reaches the best state when it is close to the metal. Thereby effectively changing the reflection phase of the electromagnetic wave, making the incident electromagnetic wave and the reflected electromagnetic wave coherent and constructive, and introducing a new resonance point at the same time, so that it works below the resonance point frequency, compensating for the parasitic capacitance between the RFID wireless radio frequency identification tag and the metal, and dispersing the image current originally on the metal, reducing the strong coupling between the original image current and the antenna of the RFID chip, effectively enhancing the performance of the RFID wireless radio frequency identification tag attached to the metal, and solving the problem that the existing RFID wireless radio frequency identification tag cannot be detected when it is attached to the metal.

[0026] Example 1

[0027] On the basis of Example 1, the reactance metasurface includes a dielectric panel, on which a metal rectangular patch is arranged, a plurality of the metal rectangular patches are arranged, and the metal rectangular patch array is distributed on the dielectric panel.

[0028] As described above, the embodiments of the present invention are described above. The preferred embodiments of the present invention are described above. If the preferred implementation methods in each preferred embodiment are not obviously self-contradictory or based on a preferred implementation method, each preferred implementation method can be arbitrarily superimposed and used in combination. The embodiments and specific parameters in the embodiments are only for the purpose of clearly describing the verification process of the invention, and are not used to limit the patent protection scope of the present invention. The patent protection scope of the present invention is still subject to its claims. Any equivalent structural changes made by using the contents of the description and drawings of the present invention should be included in the protection scope of the present invention.

Claims

1. A metal-resistant radio frequency identification tag with a reactive super surface, characterized in that: The invention comprises an RFID tag body (1), a dielectric plate of the RFID tag body (1) is provided with a metal ring (2), an antenna interface (3) of an RFID chip is welded on the metal ring (2), the metal ring (2) is inductively coupled to feed a dipole antenna (4), one end of the dipole antenna (4) close to the metal ring (2) is bent into an arc segment (41), the arc segment (41) is annularly wrapped around the outside of the metal ring (2), a reactance metasurface (5) is provided below the RFID tag body (1), the reactance metasurface (5) comprises a dielectric panel, a metal rectangular patch (51) is provided on the dielectric panel, a plurality of the metal rectangular patches (51) are provided, and the metal rectangular patches (51) are distributed in an array on the dielectric panel, and by adjusting the size, number and distribution of the metal rectangular patches, and the distance between the RFID tag and the metal, the antenna of the RFID chip reaches an optimal state when close to the metal.

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