Wearable UHF RFID tag resistant to liquid

A label and liquid technology, applied to record carriers used in machines, instruments, computer components, etc., can solve the problems of RFID chip conjugate matching, drop, and electromagnetic waves

Active Publication Date: 2020-10-27
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 achieve the condition of human body contact, increasing the passive RFID tag. Reading and writing 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
  • Wearable UHF RFID tag resistant to liquid
  • Wearable UHF RFID tag resistant to liquid
  • Wearable UHF RFID tag resistant to liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] like 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 rectangles with a length of 16mm and a width of 1mm along the width direction at 0mm, 6mm, 10mm, and 14mm from the upper edge of the antenna, respectively; 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 P...

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. like Image 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] like 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 wearable UHF RFID tag resistant to liquid. By changing the size of an original RFID antenna, an antenna with a longer transmission distance under the condition of human bodycontact is designed, and a passive wireless SENHUB series universal interface sensing chip is used in cooperation, so that non-contact accurate positioning of the body temperature of a person wearinga label is achieved. According to the invention, the transmission distance of the passive RFID tag most suitable for being worn by a human body is increased, and compared with other antennas with thesame transmission distance, the tag is smaller in size and more portable, does not need any power supply, and is lower in cost. And a magnetic material formed by stirring specially-made soft magneticrubber, rare metal powder and ferrite is added into the antenna structure, so that the transmission distance of the antenna is farther.

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 Applications(China)
IPC IPC(8): G06K19/077
CPCG06K19/0772G06K19/07773G06K19/07745
Inventor 周磊杜驰周彤
Owner HANGZHOU DIANZI UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap