A Shared-Branch Eleven-Band Mobile Antenna With a 0.5-mm Clearance for Metal-Bezel Mobile Phones Covering All the 4G LTE and 5G NR Bands

In this communication, a mobile antenna features a 0.5-mm clearance, which operates in eleven bands, is proposed for 4G and 5G metal-bezel smartphones. The proposed mobile antenna is combined with the low-frequency band (LB) antenna, the MHB&N79 (middle and high frequency band&N79) antenna, and the N77&N78 antenna. To reduce the antenna occupied space, the branches of the LB antenna are shared by the MHB&N79 and N77&N78 antennas with a lumped capacitance. Also, the method of matching network, multimodes, and multibranches is utilized to extend the antenna bandwidth. A prototype is fabricated and measured. The measured results indicate that the bandwidths of −6 dB in the LB, MHB, N79, and N77&N78 bands are 0.312 GHz (0.698–1.01 GHz), 1.19 GHz (1.62–2.81 GHz), 0.62 GHz (4.39–5.01 GHz), and 0.98 GHz (3.25–4.23 GHz), respectively. The measured efficiencies at the 4G and 5G bands are better than 44% and 40%, respectively. The proposed antenna covering all the 4G long-term evolution (LTE) and 5G new radio (NR) bands with a ground clearance of only 0.5 mm is promising for the practical applications.