• Title/Summary/Keyword: Adaptive Impedance Tuning Circuit

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A Design of Adaptive Impedance Tuning Circuit for UHF-Band Using λ/4 Transmission Line and π-Network (λ/4 전송 선로와 π-네트워크를 이용한 UHF-대역 적응형 임피던스 정합 회로 설계)

  • Hwang, Soo-Sul;Hong, Sung-Yong
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.23 no.3
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    • pp.367-376
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    • 2012
  • This paper describes a Adaptive Impedance Tuning Circuit which can be adaptively tuned between circuit's characteristic impedance and the arbitrary load impedance. The Adaptive Impedance Tuning Circuit is consisted of such parts as mismatch sensor, impedance tuner and tuning algorithm. Each parts's design methods proposed in other papers are compared with their advantages and disadvantages. And we propose simple design method for Adaptive Impedance Tuning Circuit using a ${\lambda}/4$ transmission line and ${\pi}$-network. Calculation formulas and selection algorithm from calculated values of a complex load impedance are proposed and simulation using induced calculation formulas and selection algorithm is performed. Simulation results show good agreement with theoretical predictions.

A study of measurement of the unknown load impedance using sectioned transmission line (${\lambda}/4$ 전송선로를 이용한 부하단 임피던스 측정방법에 관한 연구)

  • Hwang, Soo-Sul;Hong, Sung-Yong
    • Journal of Satellite, Information and Communications
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    • v.6 no.2
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    • pp.91-96
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    • 2011
  • 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.