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Traditional impedance measurement of a monopole antenna is inaccurate due to a likely stray radiating current on the measuring cable that is also affected by the operating human. This letter demonstrates experimentally that the elimination of this stray current is possible by using a special sleeve balun suitable for varied PCB ground-plane and human postures. Adjustment of the balun position is discussed.
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Chow et al. (1999) studied this question.
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