In this paper, a novel compact and wide band planar antenna base on the composite right-left handed transmission line (CRLH-TL) structure with enhancement gain is proposed and investigated on the Rogers_RT_Duroid5880 substrate. With CRLH metamaterial embedded technology, the proposed compact and broadband antenna is presented with best in reduction in size, bandwidth improvement, efficiency and radiation pattern enhancement. To realize characteristics of the antenna, the printed I-shaped gaps into the rectangular patches of the radiation patches are used. The physical size and the operational frequency of the antenna depend on the unit cell size and the equivalent transmission line (TL) model parameters of the CRLH-TL, including series inductance, series capacitance, shunt inductance and shunt capacitance. The compact and antenna accompanying high gain with two unit cell is designed from 0.5 GHz to 3.25 GHz which corresponding to 146% bandwidth, each of which occupies only 7.5mm× 10.5mm or 0.025λ0× 0.03λ0 at the operating frequency f=1GHz (where λ0 is free space wavelength). The physical length, width and height of the presented antenna are 15 mm, 10.5 mm and 1.6 mm or 0.05λ0, 0.03λ0 and 0.005λ0, respectively, in terms of free space wavelength. The radiation peak gain and maximum efficiency are 7dBi and 99%, respectively.

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