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The Research of Radio-frequency Label Impedance Test Based on LABVIEW

Author: LiangShuLai
Tutor: HeZuoGang
School: Hunan University
Course: Circuits and Systems
Keywords: Tags impedance LabVIEW Matching network
CLC: TN820
Type: Master's thesis
Year: 2008
Downloads: 96
Quote: 0
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Abstract


Measurement of the development of the science is very important and necessary , and even can be said that there is no scientific measurement . Well known in the DC or low frequency band of the electrical signal , voltage , current is the basic measured parameters of the electrical signal , and the application of technology in the RF section , the impedance measurement of the radio-frequency tag is the same as the voltage measuring . With the rapid development of radio frequency identification technology , accurate measurement of radio frequency tags impedance requirements are also increasing . This article is based on the importance of labels impedance measurements , the main research and to achieve high accuracy based on LabVIEW , easy to test radio frequency tags impedance measurement . ( 1) through the analysis of radio frequency identification technology development and research , as well as the principle of the UHF band RFID , pointed out the importance of the study of the subject concept of of RF tags impedance measurement . (2) introduced the concept of virtual instruments with the characteristics of the development and evolution , and building technology . And LabVIEW development platform for in-depth study and discussion , including a graphical programming language the concept of the VI ( VirtualInstrument ) , characteristics of the LabVIEW software and the LabVIEW program designed process . (3) starting from the field of radiation characteristics of the antenna , and the application of the conditions of the reflection modulator RFID system is given , i.e. the antenna far-field working conditions . Systematically expounded the concept of the number of antenna parameters such as impedance, polarization and directional coefficient . Discusses the basic theory of the microstrip antenna and transmission line analysis method . The working principle of radio frequency tags . ( 4) proposes a method of measuring radio-frequency tag impedance method , it is through a matching network to achieve , so that the the tags internal impedance and the load impedance , known under the premise of the load impedance to determine a match network coefficients, and thereby calculating the label internal impedance . Subsequently designed LabVIEW to match the configuration of the impedance measurement circuit , and its various components such as the phase difference meter , and the magnitude comparator for detailed analysis . Finally, the total circuit simulation .

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