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Design method of miniaturization label buckling antenna of tire embedded radio frequency identification device (RFID)

A design method and embedded technology, applied in the direction of calculation, computer components, radiating element structure, etc., can solve the problems of complex design process, and achieve the effect of simple design method, good impedance matching characteristics, and good resonance characteristics

Inactive Publication Date: 2015-02-18
GUIZHOU NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, Ranasinghe et al. proposed a design method of miniaturized RFID electronic tag antenna based on impedance matching, but this method needs to continuously adjust the RC equivalent circuit parameters and antenna geometric dimensions, and the design process is relatively complicated.

Method used

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  • Design method of miniaturization label buckling antenna of tire embedded radio frequency identification device (RFID)
  • Design method of miniaturization label buckling antenna of tire embedded radio frequency identification device (RFID)
  • Design method of miniaturization label buckling antenna of tire embedded radio frequency identification device (RFID)

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Experimental program
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Effect test

Embodiment 1

[0025] 1. The Bode-Fano impedance matching constraint of the electronic tag

[0026] For the RFID electronic tag chip of the CMOS process, its equivalent circuit is as follows Figure 5 shown. from Figure 5 It can be seen that the input impedance of the chip mainly depends on the junction capacitance X of the diode j and bypass capacitor X s , and can be represented by a parallel or series RC equivalent circuit. Therefore, according to the principle of RFID backscattering, for an ideal RFID electronic tag, it can be Image 6 The equivalent circuit representation including the lossless matching network is shown, where R s is the radiation resistance of the antenna, and R and C are the equivalent circuit loads of the chip parallel type respectively. According to the Bode-Fano theorem, for Image 6 For the equivalent circuit of the RFID electronic tag shown, the impedance matching should meet the following constraints:

[0027] ∫ 0 ...

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Abstract

The invention discloses a design method of a miniaturization label buckling antenna of a tire embedded radio frequency identification device (RFID). The design method comprises the following steps of determining geometric dimension of bending units and input impedance of a label chip; determining quantity of the bending units in the horizontal direction; determining quantity of the bending units in the vertical direction; adjusting width of a meander line to enable antenna gain to be maximum; and increasing feed ends and adjusting loop inductance to enable the antenna impedance to be in conjugate match with the chip impedance. The design method is simple, effective and convenient to design, has good impedance matching characters, and enables the miniaturization label buckling antenna to be maximum in radiation gain and low in cost. Simultaneously, the design method can be applied to RFID application fields of communication, industrial control, equipment manufacturing, intelligent agriculture, food safety and the like.

Description

technical field [0001] The invention relates to a design method of an RFID antenna, in particular to a design method of a tire-embedded RFID miniaturized tag bending antenna. Background technique [0002] RFID (Radio Frequency IDentification) technology, also known as electronic tags and radio frequency identification, is a non-contact automatic identification technology. It automatically identifies target objects and obtains relevant data through radio frequency signals. The identification work does not require manual intervention. Can work in various harsh environments. RFID technology is attracting more and more attention and applications because it uses the principle of electromagnetic wave backscattering to realize non-contact and non-line-of-sight identification of objects, and has low cost and power consumption. For example, car tires are embedded with RFID electronic tags to track the number of kilometers traveled by the tires, tire tread depth, tire wear, monitor t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01Q1/36G06K19/077
Inventor 胡圣波司兵李黔蜀鄢富玉舒恒黎玉成宋小伟
Owner GUIZHOU NORMAL UNIVERSITY