Asymmetric Folded Dipole Antenna With High Front to Back Ratio for LTE Base Stations
In this letter, a broadband asymmetric folded dipole antenna with high front to back ratio (FBR) for LTE base stations is proposed. The proposed antenna consists of asymmetric folded dipoles, a planar hook shaped microstripline, and a square metal reflector. By loading an appropriate circular aperture on the reflector, the back radiation of the antenna is effectively reduced, thereby improving the FBR. At S11 15 dB, the simulated and measured impedance bandwidth of the proposed antenna is 58.2% (1.62 2.95 GHz) and 52.1% (1.66 2.83 GHz) respectively. The antenna exhibits desired unidirectional radiation pattern with half power beamwidth greater than 65 deg at both principal planes and FBR from 18.6 to 25 dB in the frequency range of interest, 1.7 2.7 GHz. Also, it has an average gain of 7.5 dBi.
IEEE Antennas and Wireless Propagation Letters