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A flexible anti-metal RFID tag antenna and impedance analysis method

A technology for RFID tags and tag antennas, applied to antennas, antenna parts, antenna grounding devices, etc., can solve the problems of large size of patch antennas, achieve high power transmission coefficient, not easy to crack, and compact structure

Active Publication Date: 2021-12-31
ARMOR ACADEMY OF CHINESE PEOPLES LIBERATION ARMY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Unlike traditional dipole antennas, it has a metal base plate that can be used to isolate metal effects; however, since metal effects must be designed to resonate at its half wavelength, the size of the patch antenna is large

Method used

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  • A flexible anti-metal RFID tag antenna and impedance analysis method
  • A flexible anti-metal RFID tag antenna and impedance analysis method
  • A flexible anti-metal RFID tag antenna and impedance analysis method

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Embodiment Construction

[0027] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and embodiments. The following examples are intended to illustrate the present invention, but not to limit the scope of the present invention.

[0028] figure 1 For the structure of the proposed tag antenna layer, it can be seen that there are six layers of structure. The label includes from top to bottom: a protective layer, a label chip, an antenna layer, a dielectric substrate layer, a short-circuit wall and a metal bottom plate. figure 2 For the structure of the proposed tag antenna layer, it consists of three etched rectangular antenna layers (right side) and a square metal base plate (left side). The antenna layer is connected to the metal base plate through an inductive short-circuit wall.

[0029] In order to analyze the impedance characteristics of the tag antenna, the equivalent circuit model of the tag antenna is establis...

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Abstract

The application discloses a flexible anti-metal RFID tag antenna and an impedance analysis method. The tag antenna includes: a protective layer, a tag chip, an antenna layer, a dielectric substrate layer, a short-circuit wall and a metal bottom plate. According to the structural composition of the tag, the antenna layer and the metal ground plate are equivalent to a flat capacitor; each structure in the antenna layer is equivalent to resistance, inductance and capacitance; the short-circuit wall is equivalent to resistance and inductance, which affects the antenna impedance. An equivalent circuit is deduced from this to describe the impedance characteristics, which provides a basis for the design of the antenna. Among them, the dielectric substrate layer is composed of two parts. The first dielectric layer is polyimide (PI) used to enhance the robustness of the label and prevent cracking during folding. The second medium layer is soft foam (PP‑2) bonded with the first medium layer. The antenna can provide enough resistance and inductive reactance to perform conjugate matching with the chip.

Description

technical field [0001] The invention relates to the field of radio frequency identification, in particular to a UHF RFID tag antenna impedance analysis method, software optimization simulation and tags. Background technique [0002] Radio Frequency Identification (RFID) is an automatic identification technology. When the tag receives the radio frequency signal sent by the reader, an induced current will be generated on its surface. With the help of the induced current, the tag will send a signal of a certain frequency. After decoding by the reader, Into the system for data processing. Ultra-high frequency (UHF) radio frequency identification (RFID) tags have the advantages of long reading range and high data transmission rate, and are widely used in commodity labels in stores. Passive RFID tags have attracted much attention in the field of Internet of Things (LOT) and are used for the identification and tracking of items. In practical applications, UHF radio frequency iden...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01Q1/40H01Q1/22H01Q1/38H01Q1/48G06F30/20G06F111/10
CPCH01Q1/40H01Q1/2225H01Q1/38H01Q1/48G06F30/20G06F2111/10
Inventor 董丽虹王海斗王朋底月兰郭伟徐雅薇刘志强邢乐丽
Owner ARMOR ACADEMY OF CHINESE PEOPLES LIBERATION ARMY