On the impedance matching of left-handed materials to free-space
Résumé
Using an original approach, this work shows that the intrinsic impedance, as it is usually defined, is negative for a left-handed medium (LHM) and a method to match left-handed media to free space is proposed. A full-wave technique is used to validate our analysis and proposed scheme. Our work is not in contradiction with previous studies on left-handed media and does not mean that the LHM is active, but we explain why one can encounter dificulty in simulating the excitation by an electromagnetic wave of an interface air/LHM if the LHM is considered homogeneous and we show that it is possible to excite the forward wave of a left-handed medium instead of the backward wave as it is usually done.
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