Adaptive Impedance Matching System Using FPGA Processor for Efficient Control Algorithm

Hirokazu OBA
Minseok KIM
Ryotaro TAMAKI
Hiroyuki ARAI

IEICE TRANSACTIONS on Electronics   Vol.E91-C    No.8    pp.1348-1355
Publication Date: 2008/08/01
Online ISSN: 1745-1353
DOI: 10.1093/ietele/e91-c.8.1348
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Microwaves, Millimeter-Waves
antenna input impedance,  automatic matching system,  FPGA,  

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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.