A Low Profile,Wideband and Dual-Polarized Base Station Antenna Based on the Dipole with High Input Impedance
In this paper,a wideband,dual-polarized antenna with extremely low profile is developed for base station application. The antenna evolved from two fan-shaped dipoles that crossed each other. By adding annular branches and met-allized through holes at the end of the dipole,its port input impedance increases when the antenna occupies a lower height. Besides,the flare angle of the fan-shaped arm is increased so that a second resonant point can be generated to achieve the purpose of expanding the bandwidth. The dual-polarized antenna can provide a bandwidth of 22％ in the 2.17～2.7 GHz band. Because the two dipoles is highly symmetrical about the geometric center,the isolation degree and cross polarization discrimination are high in the working frequency band,among which the simulation value of the isolation degree can reach 51 dB,and the simulation value of the cross polarization discrimination in the 0° can reach 48 dB. In addition,the simulated peak gain of the antenna is as high as 9.6 dBi. The antenna has the advantages of high isolation,high cross-polarization dis-crimination and high gain,and has a good application prospect in the base station system.
base stationdual-polarized antennadipole antennainput impedancelow profile antennawideband antenna
万方数据
维普
