Design of a 5G Multi-band Mobile Phone Antenna Based on CRLH-TL

Based on the principle of composite left and right hand transmission lines (CRLH- TL), a new type of multi-band hybrid multi-mode mobile phone antenna is designed. It is a combination of a monopole antenna and two Zero-order Resonator (ZOR) antennas. The antenna is printed on the PCB board of a typical smartphone with the size of 70 mm × 160 mm × 3.5 mm. Since the resonant frequency of ZOR antenna does not depend on the size characteristics, it will be helpful in the miniaturization of the antenna. Simulation results show that the center resonant frequencies locate at 1.04 GHz, 1.70 GHz, 2.52 GHz, 3.65 GHz, 4.26 GHz, and 4.9 GHz, covering the 4G LTE2300 (2305–2400 MHz), LTE2500 (2575–2635 MHz), DCS1800 (1710–1880 MHz), WLAN (2.4-2.485 GHz), and WiMAX (2.5-2.69 GHz, 3.3 -3.7 GHz) with good omnidirectional radiation characteristics and acceptable gain.