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Miniaturized UHF anti-metal multipurpose rfid tag antenna

An RFID tag, anti-metal technology, applied in the direction of antenna support/installation device, radiating element structure, etc., can solve the problems of easy damage, poor performance, inconvenience, etc., and achieve flexible adjustment ability, good working performance, and expansion The effect of working range

Active Publication Date: 2018-03-06
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Excessive antenna size brings inconvenience to use, and is also easy to damage
Another weakness of existing anti-metal tag antennas is that they can only be used on metal objects and perform poorly on other non-metallic objects

Method used

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  • Miniaturized UHF anti-metal multipurpose rfid tag antenna
  • Miniaturized UHF anti-metal multipurpose rfid tag antenna
  • Miniaturized UHF anti-metal multipurpose rfid tag antenna

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] see figure 1 , The miniaturized ultra-high frequency anti-metal multi-purpose RFID tag antenna includes three layers of metal patch A, dielectric material B and metal film C from top to bottom. The metal patch A contains the main radiation patch A r , parasitic patch A p , L-type feeder A f and other structures. It is characterized by:

[0032] 1) The L-shaped feeder A f It is a non-equal-width L-shaped feeder that is wider in the longitudinal direction than in the transverse direction, and its longitudinal and transverse ends are respectively grounded through short-circuit pin 1 and short-circuit pin 2, and a label chip is connected to the transverse end;

[0033] 2) The main radiation patch A r Presents the outline of half a regular hexagon, the main radiation patch A r outside is the parasitic patch A p , parasitic patch A p and main radiation patch A r There is a gap between 4, parasitic patch A p There is a gap 3 at the middle end;

[0034] 3) The main ...

Embodiment 2

[0038] This embodiment is basically the same as Embodiment 1, and the special features are as follows:

[0039] 1) The main radiation patch A r and parasitic patch A p is fully enclosed;

[0040] 2) The size of the dielectric material B is larger than that of the metal patch A;

[0041] 3) When used on the surface of metal products, the metal thin film C may not be present.

Embodiment 3

[0043] This embodiment is basically the same as Embodiment 1, and the special feature is as follows: the working performance of the antenna on the surface of five common materials, namely dry wood, paper, hard rubber, quartz glass and porcelain products, and other non-metallic products.

[0044] Figure 5~7 Performance parameters of the antenna on the surface of the above article are shown. Figure 5 The return loss parameters of the antenna on the above material items are shown, Image 6 and Figure 7 The antenna pattern at 910MHz and 920MHz are shown respectively. Antenna gain increases with the increase of material permittivity. Within the range of the dielectric constant of the above materials (ε r=2~4), the main axis gains of the antenna at 910MHz and 920MHz are -17~-13dBi and -13~-11dBi respectively. The antenna can meet the return loss requirements of the 902MHz~928MHz band when placed on the above-mentioned material items, and the pattern shows that the antenna ha...

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PUM

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Abstract

The invention relates to a miniaturized ultra-high frequency anti-metal multipurpose RFID tag antenna. The tag antenna is composed of a layer of slotted metal sheet, a layer of dielectric material and a layer of metal film. The tag antenna has the characteristics of low profile, and the antenna surface is only 15cm2 in size, which meets the UHF RFID bands in South and North America, China and Australia (‑10dB working bandwidth covers 902MHz~928MHz). The tag antenna has good working performance on the surface of metal products and non-metal products. The tag antenna has a wide range of applications, such as logistics management, production management, storage and transportation, and the like.

Description

technical field [0001] The invention relates to a miniaturized ultra-high frequency anti-metal multipurpose RFID (radio frequency identification) tag antenna. Background technique [0002] With the continuous increase of application requirements such as logistics transportation and warehouse management, ultra-high frequency radio frequency identification (UHF-RFID) technology has received more and more attention in recent years. In many application areas, labels need to be attached to the surface of metal products. Because the metal surface will affect the performance of the tag antenna, it will encounter great challenges when applying radio frequency identification technology to items containing a lot of metal, such as all metal products, antiques, banknotes, and vehicles. [0003] Some anti-metal RFID tag antennas currently proposed are relatively large in size, and the general dielectric layer area is not less than 70×70mm 2 , and the area of ​​the metal patch part is n...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01Q1/38H01Q1/22
Inventor 沈文辉林嘉宏
Owner SHANGHAI UNIV
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