On the minimum number of states for switchable matching networks

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    Abstract

    The impedance of an antenna changes heavily with changing EM environments, while RF power amplifiers (PAs) are optimized for driving a well-defined load impedance. As a solution, switchable matching networks are used in automatic antenna tuners to match the antenna impedance to (about) the desired PA load impedance. This paper presents a theoretical treaty of the minimum number of required states for switchable matching networks to achieve sufficient matching from a certain load VSWR to a sufficiently low input VSWR. First for an arbitrary passive lossless switchable matching network, the mathematical minimum required number of states as a function of the required input VSWR and of the required load VSWR is derived. Several variants are analyzed and benchmarked: single-stage one-ring configuration, single-stage two-ring configuration, two-stage one-ring configuration and three-stage one-ring configuration showing that single-ring configurations are optimum. An extension towards the required number of states for lossy matching networks is also provided.
    Original languageEnglish
    Pages (from-to)433-440
    Number of pages8
    JournalIEEE transactions on circuits and systems I: regular papers
    Volume62
    Issue number2
    DOIs
    Publication statusPublished - 1 Feb 2015

    Keywords

    • EWI-25850
    • IR-94739
    • METIS-312518

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