TABLE 1.1.Verification of Main Properties and Fundamental Physics of LH MTMs by Different Approaches and Different Groups. Type of Investigation References Numerical FDTD Ziolkowski et al.[27,28] Numerical FEM Caloz et al.[29] Numerical TMA Markǒs et al.[20,21] Numerical TLM So and Hoefer [30,31] Theoretical EM Lindell et al.[32],Kong et al. [33,34],Smith et al..[35], McCall et al.[36] Experimental Shelby et al.[10],Greegor (bulk)TW-SRR et al.[22],Ziolkowski [26], Marques et al.[25]Tie Jun Cui Theoretical TL Eleftheriades et al.[37,38], Caloz and Itoh [39,40], 0 liner[41,42] Experimental Iyer et al.[43],Caloz and Itoh (planar)TL [40],Sanada et al.[44]Tie Jun Cui