Adaptive Impedance-Matching Techniques for Controlling L Networks

A. Bezooijen, van; M.A. de Jongh; F.E. van Straten; R. Mahmoudi; A.H.M. Roermund, van

doi:10.1109/TCSI.2009.2023764

Adaptive Impedance-Matching Techniques for Controlling L Networks

A. Bezooijen, van, M.A. de Jongh, F.E. van Straten, R. Mahmoudi, A.H.M. Roermund, van

Integrated Circuits

Research output: Contribution to journal › Article › Academic › peer-review

79 Citations (Scopus)

Abstract

The link quality of mobile phones suffers from antenna mismatch due to fluctuating body effects. Techniques for adaptive control of impedance-matching L networks are presented, which provide automatic compensation of antenna mismatch. To secure reliable convergence, a cascade of two control loops is proposed for independent control of the real and imaginary parts of impedance. A secondary feedback path is used to enforce operation into a stable region when needed. These techniques exploit the basic properties of tunable series and parallel LC networks. A generic quadrature detector that offers a power-independent orthogonal reading of the complex impedance value is presented, which is used for direct control of variable capacitors. This approach renders calibration and elaborate software computation superfluous and allows for autonomous operation of adaptive antenna-matching modules.

Original language	English
Pages (from-to)	495-505
Number of pages	11
Journal	IEEE Transactions on Circuits and Systems. I, Fundamental Theory and Applications
Volume	57
Issue number	2
DOIs	https://doi.org/10.1109/TCSI.2009.2023764
Publication status	Published - 2010

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title = "Adaptive Impedance-Matching Techniques for Controlling L Networks",

abstract = "The link quality of mobile phones suffers from antenna mismatch due to fluctuating body effects. Techniques for adaptive control of impedance-matching L networks are presented, which provide automatic compensation of antenna mismatch. To secure reliable convergence, a cascade of two control loops is proposed for independent control of the real and imaginary parts of impedance. A secondary feedback path is used to enforce operation into a stable region when needed. These techniques exploit the basic properties of tunable series and parallel LC networks. A generic quadrature detector that offers a power-independent orthogonal reading of the complex impedance value is presented, which is used for direct control of variable capacitors. This approach renders calibration and elaborate software computation superfluous and allows for autonomous operation of adaptive antenna-matching modules.",

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AU - Bezooijen, van, A.

AU - de Jongh, M.A.

AU - van Straten, F.E.

AU - Mahmoudi, R.

AU - Roermund, van, A.H.M.

PY - 2010

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AB - The link quality of mobile phones suffers from antenna mismatch due to fluctuating body effects. Techniques for adaptive control of impedance-matching L networks are presented, which provide automatic compensation of antenna mismatch. To secure reliable convergence, a cascade of two control loops is proposed for independent control of the real and imaginary parts of impedance. A secondary feedback path is used to enforce operation into a stable region when needed. These techniques exploit the basic properties of tunable series and parallel LC networks. A generic quadrature detector that offers a power-independent orthogonal reading of the complex impedance value is presented, which is used for direct control of variable capacitors. This approach renders calibration and elaborate software computation superfluous and allows for autonomous operation of adaptive antenna-matching modules.

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DO - 10.1109/TCSI.2009.2023764

M3 - Article

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JO - IEEE Transactions on Circuits and Systems. I, Fundamental Theory and Applications

JF - IEEE Transactions on Circuits and Systems. I, Fundamental Theory and Applications

IS - 2

ER -

Adaptive Impedance-Matching Techniques for Controlling L Networks

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