Radio frequency identification ultrahigh frequency band tag antenna used in metal environment

A radio frequency identification and ultra-high frequency technology, applied in the field of radio frequency identification, can solve the problems of difficult processing technology, large size of anti-metal tags, deterioration of tag antenna performance, etc., to achieve the effects of small size, increased antenna bandwidth, and good performance

Inactive Publication Date: 2021-08-27
HEFEI UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to solve the problem of the performance deterioration of the tag antenna in the metal environment, and overcome the problems of the existing anti-metal tag with large size and difficult processing technology, the present invention provides a radio frequency identification (RFID) ultra-high frequency band tag antenna applied in the metal environment

Method used

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  • Radio frequency identification ultrahigh frequency band tag antenna used in metal environment
  • Radio frequency identification ultrahigh frequency band tag antenna used in metal environment
  • Radio frequency identification ultrahigh frequency band tag antenna used in metal environment

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Embodiment 1

[0036] combine figure 1 and figure 2 , a radio frequency identification UHF band tag antenna applied in a metal environment includes a tag chip 2 , a radiation patch 4 , a dielectric substrate 8 and a metal bottom plate 9 . The radiation patch 4 is fixedly attached to the top surface of the dielectric substrate 8 , and the metal bottom plate 9 is fixedly attached to the bottom surface of the dielectric substrate 8 . The material of the radiation patch 4 and the material of the metal base plate 9 are both copper, and the thickness of the radiation patch 4 and the metal base plate 9 are both 0.2 mm; the material of the dielectric substrate 8 is FR4, and the thickness is 3.0 mm. combine image 3 and Figure 4 It can be seen that the size W1×L1 of the dielectric substrate 8 and the metal bottom plate 9 are the same, which is 40mm×89mm.

[0037] combine figure 1 and figure 2 One side of the radiation patch 4 is parallel to one side of the dielectric substrate 8, and the cor...

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Abstract

The invention relates to a radio frequency identification ultrahigh frequency band tag antenna used in a metal environment, and belongs to the technical field of radio frequency identification electronic tags. The radio frequency identification tag antenna comprises a radiation patch, a tag chip, a dielectric substrate and a metal bottom plate. The radiation patch comprises a bent T-shaped open-circuit stub line feed structure, an H-shaped groove and a symmetrical rectangular gap, wherein the chip is located on an open-circuit stub line. During design, the metal bottom plate is used as a part of the tag antenna, so that the tag antenna has metal resistance; and simulation and experiment tests show that in the metal environment, the actual reading distance of the tag antenna in a working frequency band is 3.48 m or above, the maximum identification distance reaches 6.24 m, and the performance exceeds that of a common metal-resistant tag; the resonant frequency, gain and the like of the tag antenna are less affected by metal; the -3dB bandwidth of the tag antenna is 863MHz-940MHz, and the center frequency of the tag antenna is 915MHz; and the antenna is directly printed on a single-layer substrate and is not provided with a grounding layer or a short-circuit pin, so that the manufacturing cost can be reduced.

Description

technical field [0001] The invention belongs to the technical field of radio frequency identification and relates to a radio frequency identification electronic tag, in particular to an anti-metal tag antenna working in an ultra-high frequency band. Background technique [0002] Radio Frequency Identification (RFID) technology is widely used in many fields and industries such as logistics management, transportation, and medical treatment because of its long reading distance. In most of the above application scenarios, the RFID tag antenna will inevitably contact metal objects. However, when a common passive UHF tag with a dipole-like antenna is applied to a metal surface, its impedance matching, radiation efficiency, and radiation pattern will all change, resulting in poor performance of the tag or even being effectively read. [0003] For ordinary passive UHF tags, when they are attached to metal surfaces, the impedance matching, radiation efficiency, and directivity of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01Q1/22H01Q1/38H01Q1/50H01Q1/52H01Q9/04
CPCH01Q1/2225H01Q1/38H01Q1/50H01Q1/52H01Q9/045
Inventor 佐磊曹雪兵朱良帅左敏何怡刚李兵尹柏强袁莉芬
Owner HEFEI UNIV OF TECH
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