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A study of measurement of the unknown load impedance using sectioned transmission line  

Hwang, Soo-Sul (한국항공우주연구원 발사체기술연구소 발사체기술개발실 발사체전자팀)
Hong, Sung-Yong (충남대학교 전파공학과 RF 기술연구실)
Publication Information
Journal of Satellite, Information and Communications / v.6, no.2, 2011 , pp. 91-96 More about this Journal
Abstract
In this paper, we present measurement method of the unknown load impedance. Load impedance is continuously varied by external environment conditions. This arbitrarily varied load impedance can be calculated using 3-point voltage measurement on ${\lambda}/4$ sectioned transmission line. We derived several numerical formulas from 3-point voltage measurement results and drew load impedance selection algorithm from calculated load impedance results. These numerical formulas and load impedance selection algorithm are verified by ADS simulation. Simulation results showed that arbitrary load impedance can be correctly measured using above mentioned formulas and selection algorithm.
Keywords
Sectioned transmission line; load impedance; voltage standing wave; reflection coefficient; adaptive impedance tuning circuit;
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  • Reference
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