Adaptive Impedance Matching System Using FPGA Processor for Efficient Control Algorithm

Hirokazu OBA; Minseok KIM; Ryotaro TAMAKI; Hiroyuki ARAI

doi:10.1093/ietele/e91-c.8.1348

Regular Section

Adaptive Impedance Matching System Using FPGA Processor for Efficient Control Algorithm

Hirokazu OBA, Minseok KIM, Ryotaro TAMAKI, Hiroyuki ARAI

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Keywords: antenna input impedance, automatic matching system, FPGA

JOURNAL RESTRICTED ACCESS

2008 Volume E91.C Issue 8 Pages 1348-1355

DOI https://doi.org/10.1093/ietele/e91-c.8.1348

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Abstract

The input impedance of an antenna fluctuates because of various usage conditions, which causes a mismatch between an internal circuit and an antenna. An automatic matching system solves this problem, then this paper presents a reconfigurable impedance tuner that has a set of fixed capacitors controlled by switching p-i-n diodes. A fast control algorithm for selecting the appropriate conditions of an impedance tuner is proposed and mounted on FPGA to demonstrate the performance.

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