Wideband metal-line antenna for 5G metal frame mobile phones

In this paper, a wideband metal-line antenna for $\mathbf{5 G}$ metal frame mobile phones is proposed and analyzed. The proposed antenna consists of a T branch and two ground branches, an SP5T switch is used, by using suitable character modes and zeroth-order-resonance, the proposed antenna can cover the band of 700$960 M H z, 1710-2690 M H z$ and has the higher efficiency than traditional IFA. The ground clearance is only 0.5 mm and the total length is 75 mm. The simulation efficiencies are about -6.4~3.2dB at $\mathbf{7 0 0 - 9 6 0 M H z},-4 \sim-1.9 d B$ at $1710-2690 \mathrm{MHz}$.