Unlock instant, AI-driven research and patent intelligence for your innovation.

A liquid-resistant wearable uhf RFID tag

A label and liquid technology, which is applied in the field of transmission distance, can solve the problems of affecting electromagnetic waves, reducing the reading and writing distance, increasing the reading and writing distance of passive RFID tags, etc., and achieves the effect of low cost and small size

Active Publication Date: 2022-02-18
HANGZHOU DIANZI UNIV +1
View PDF7 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when RFID tags across the country are being read, the gain of their antennas will be severely reduced by the influence of liquids, resulting in shortened reading distances. The human body can also be regarded as liquids, which will affect the conduction of electromagnetic waves when they come into contact with passive RFID tags. , causing the impedance change of the antenna port, which is not conducive to realizing conjugate matching with the RFID chip, resulting in a decrease in the reading and writing distance. This patent is used in the passive RFID tag antenna to realize the reading of the passive RFID tag under the condition of human body contact. write distance

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A liquid-resistant wearable uhf RFID tag
  • A liquid-resistant wearable uhf RFID tag
  • A liquid-resistant wearable uhf RFID tag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Such as figure 1 As shown, the total length of the passive RFID antenna is 58mm, and the width is 18mm; the antenna structure is left-right symmetrical; three lengths of 16mm, 1mm wide rectangle; etch three 16mm long, 1mm wide rectangles along the width direction at 0mm from the upper edge, 6mm, 10mm, and 14mm from the left edge of the antenna; At the position of 4mm from the left edge, etch a rectangle with a length of 25mm and a width of 1mm along the length direction; etch a rectangle with a length of 18mm and a width of 1mm at a position of 0mm from the lower edge of the antenna and 11mm from the left edge in the length direction. Rectangular; Etch an isosceles right-angled triangle with a right-angled side of 2mm at a distance of 23mm from the left edge of the antenna, one of the waists coincides with the upper edge of the antenna, and the other waist is parallel to the left edge of the antenna, with a distance of 25mm; the right half of the antenna Part of it is ...

Embodiment 2

[0028] Figure 5 The magnetic material used for this product is electromagnetic anti-interference magnetic cloth, which is made by mixing special soft magnetic rubber with rare metal powder and ferrite. Such as Figure 6 As shown, on the basis of Embodiment 1, a rectangular magnetic material with a length of 6 mm and a width of 2 mm is placed in the resonant cavity of the antenna. The geometric center of the magnetic material overlaps with the geometric center of the resonant cavity, which can greatly improve the human body. The transmission distance of the tag when worn.

Embodiment 3

[0030] Such as Figure 7 As shown, on the basis of the second embodiment, a rectangular magnetic material with a length of 5 mm and a width of 2 mm is placed in the rectangular cavity of the antenna at a position 2 mm above the chip, and the magnetic material is symmetrical about the symmetry axis of the antenna. The radio frequency distance of the tag in this embodiment is increased by more than ten centimeters compared with the second embodiment.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a liquid-resistant wearable UHF RFID tag. By changing the size of the original RFID antenna, an antenna with a longer transmission distance is designed under the condition of human body contact. The sensor chip realizes the non-contact precise positioning of the body temperature of the person wearing the tag. The invention not only increases the transmission distance of the most suitable passive RFID tag worn by the human body, but also has a smaller size and is more portable than other antennas with the same transmission distance, and does not need any power supply at the same time, and the cost is lower. The transmission distance of the antenna can be further extended by adding a magnetic material made of special soft magnetic rubber, rare metal powder and ferrite in the antenna structure.

Description

technical field [0001] The invention belongs to the field of antenna technology and wireless communication, and in particular relates to the realization of increasing the transmission distance of a human body contact type passive RFID. Background technique [0002] Since the beginning of the epidemic, the resumption of work and school has always been an event that has attracted the attention of the society. In order to cooperate with the policy of returning to work and returning to school, major companies have launched a variety of temperature measurement products. [0003] At present, there are infrared thermometers and camera temperature measuring equipment for epidemic prevention. The former needs to measure body temperature manually, and the supervisors need to have close contact with the people to be tested, and they need to close the entrances and exits. Only limited entrances and exits are reserved, which consumes manpower and material resources. And other issues. A...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G06K19/077
CPCG06K19/0772G06K19/07773G06K19/07745
Inventor 周磊杜驰周彤
Owner HANGZHOU DIANZI UNIV