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Measurement of tag antenna by a time domain reflectmetry
Author(s) -
Chang The Nan,
Shie Wein
Publication year - 2011
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.25649
Subject(s) - waveform , time domain , antenna (radio) , transmission line , transmission (telecommunications) , reflection (computer programming) , signal (programming language) , microwave , electronic engineering , reflection coefficient , electrical engineering , frequency domain , electrical impedance , input impedance , acoustics , computer science , physics , engineering , telecommunications , voltage , computer vision , programming language
In this article, an RFID tag antenna etched on a grounded substrate is designed and tested. It takes two differentially connected photonic band gap elements. For each differential port, tag's reflection coefficient in frequency domain is transformed from two measured time domain waveforms. The first one as the input waveform is referred to an open‐circuited transmission line, whereas the second one as the response waveform is obtained by connecting one half of the tag at the end of each associated transmission line. As the TDR can provide differential signal, measurement of the tag's impedance becomes easy. Waveform in time domain is truncated according to Nicolson's ramping algorithm. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:90–93, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25649