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Passive ultrahigh frequency radio frequency identification label with automatic impedance matching function

A radio frequency identification tag and automatic impedance technology, which is applied in the near field transmission system, read/write/query/recognition near field transmission system, transmission system, etc. effect of distance

Active Publication Date: 2017-09-15
XIDIAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method of impedance matching by adjusting the shape of the antenna cannot achieve the best matching in actual working conditions; and the method of impedance adjustment at the chip end of the tag has not yet been reported

Method used

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  • Passive ultrahigh frequency radio frequency identification label with automatic impedance matching function
  • Passive ultrahigh frequency radio frequency identification label with automatic impedance matching function
  • Passive ultrahigh frequency radio frequency identification label with automatic impedance matching function

Examples

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Embodiment Construction

[0046] The principles and features of the present invention are described below in conjunction with the accompanying drawings, and the examples given are only used to explain the present invention, and are not intended to limit the scope of the present invention.

[0047] Such as figure 1 As shown, a passive UHF radio frequency identification tag with automatic impedance matching function includes an automatic impedance matching network and a passive UHF radio frequency identification tag. The automatic impedance matching network is used to detect the wireless The local voltage of the source UHF RFID tag is used to adjust the overall impedance of the passive UHF RFID tag, so that the overall impedance of the passive UHF RFID tag matches the impedance of the antenna; the passive UHF RFID tag matches the impedance of the antenna; The source UHF radio frequency identification tag is used to obtain the maximum energy from the antenna based on impedance matching, and complete the r...

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Abstract

The invention relates to a passive ultrahigh frequency radio frequency identification label with an automatic impedance matching function. The passive ultrahigh frequency radio frequency identification label with the automatic impedance matching function comprises an automatic impedance matching network and a passive ultrahigh frequency radio frequency identification label; the automatic impedance matching network is used for adjusting an overall impedance of the passive ultrahigh frequency radio frequency identification label by detecting a partial voltage of the passive ultrahigh frequency radio frequency identification label to enable the overall impedance of the passive ultrahigh frequency radio frequency identification label to match with the impedance of an antenna; and the passive ultrahigh frequency radio frequency identification label is used for obtaining the maximum energy from the antenna based on the impedance matching and finishing radio frequency identification of the energy. By performing impedance adjustment at the chip end of the passive ultrahigh frequency radio frequency identification label, the impedance of a label circuit can be adjusted dynamically in a relatively big frequency range when the circuit is in different working states and the working distance changes; the label load impedance and the impedance at the interior of the antenna are matched; the maximum power collection is realized; and the working distance of the label in different working states is accordingly improved.

Description

technical field [0001] The invention relates to the field of passive ultra-high frequency radio frequency identification tags, in particular to a passive ultra high frequency radio frequency identification tag with automatic impedance matching function. Background technique [0002] Radio Frequency Identification (RFID) technology emerged in the 1990s. This technology realizes contactless information transmission through radio frequency signal coupling, and identifies targets based on the transmitted information. [0003] According to the different working frequency bands of the tags, RFID tags can be divided into microwave band (MW) tags, ultra high frequency (UHF) tags, high frequency (HF) tags and low frequency (LF) tags. Tags that work between 860MHz and 960MHz are called UHF tags, which are currently the hot spot in the development of the RFID industry. They have the advantages of long communication distance, fast communication speed, and low cost. [0004] According t...

Claims

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Application Information

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IPC IPC(8): H04B5/00H04B5/02H01Q1/22
CPCH01Q1/2225H04B5/77H04B5/48
Inventor 李小明庄奕琪汪坤王少龙刘伟峰彭琪
Owner XIDIAN UNIV
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