A planar multiband antenna based on CRLH-TL ZOR for 4G compact mobile terminal applications

A planar multiband antenna based on composite right-and-left-handed transmission line (CRLH-TL) zeroth-order resonator (ZOR) for 4G compact mobile terminals is proposed in this letter. The proposed antenna consists of a monopole, a CRLH-TL structure and a triangular radiation patch. Among them, the monopole antenna can cover GSM850/950 (824–960 MHz) and LTE2500 (2500–2690 MHz); capacitive excitation of the CRLH-TL structure can produce ZOR mode to cover LTE band 12 (698–746 MHz); triangular radiation patch can cover high-frequency DCS, PCS, UMTS, LTE2300 (1710–2490 MHz). Since the antenna has the advantage of multiband, compact size and ease to fabricate, it can be applied to design 4G compact mobile terminals.