Broadband asymmetric folded dipole antenna for LTE base station

In this paper, a broadband asymmetric folded dipole antenna for LTE base station is proposed. The antenna consists of two coplanar asymmetric dipoles, a hook shaped microstripline and a ground reflector. The microstripline is electromagnetically coupled to the dipoles without using any physical shorting pins. A ground reflector is placed below the antenna to obtain the unidirectional radiation pattern. By varying the geometry of the asymmetric dipoles and microstripline, a broad impedance bandwidth is achieved, At -15 dB, the simulated impedance bandwidth is 56.52 % (1.65 - 2.95 GHz). The simulated beamwidth at E-plane and H-plane are greater than 65 degree. The antenna has a stable gain varying from 6.65 dBi to 7.76 dBi.