The historical backdrop of metamaterials began with the visionary hypothesis on the existence of substances with simultaneously negative value of permittivity and permeability, by Russian physicist Viktor Veselago in 1968. Metamaterials are artificially designed structure whose properties are very extraordinary concerning material effectively exhibit in nature as proposed by Viktor Veselago. Miniaturized antennas are a subject of great interest in the development of small-scale gadgets such as mobile phones, micro/nanosatellites, laptops, etc. Since the metamaterial structures are effectively homogeneous, they can be utilized for designing miniaturized antenna. Miniaturization can be attained by the special condition of CRLH-TL, known as ZOR. In the beginning of this chapter, a detailed introduction along with the advancement in the area of MTMs has been presented. In this regard, an extensive literature review of distinct kinds of MTM antennas have been carried out. According to the available literature, MTMs are artificially engineered structures that follow homogeneity principle and offers unconventional properties like negative permittivity and permeability. In this chapter short-ended termination-based two antenna configurations have been presented. In the first antenna structure, simplified CRLH-TL-based miniaturized ZOR antenna has been discussed. In this antenna, the bandwidth and ZOR frequency are regulated by tuning series LC parameters. The second antenna configuration is a CRLH-TL-based wideband ZOR MTM antenna. This antenna configuration utilizes the mode merging concept to achieve wideband. In this approach, several dimensions of antenna structure have been optimized in such a manner so that the maximum number of possible resonances must lie near to each other and result in a wide bandwidth in miniaturized antennas.