一种适用于WLAN的新型高隔离度双频双极化天线

A Novel Dual-Band Dual-Polarized Antenna for WLAN Application with High Isolation

本文设计了一种新型的适用于WLAN的双频双极化微带天线.该天线通过改变辐射贴片以及缝隙的尺寸,并在凸字形的辐射贴片夹角处开缝,以此来实现双频双极化特性.同时,通过改变馈线形状并在馈线上开U型缝隙,提高端口隔离度以及高频工作频带的带宽.利用电磁仿真软件HFSS对天线的结构参数进行仿真和优化.仿真结果表明:天线可以工作在2.36GHz和5.44GHz两个频率点,相对阻抗带宽分别为10.6%(2.21GHz^2.46GHz)、4.8%(5.31GHz^5.57GHz).两个频段增益最大值分别约为4dB,5dB.

In this paper,a novel dual-band dual-polarized antenna for WLAN application with high isolation is proposed.The antenna is designed to achieve dual-band and dual-polarization by changing the dimensions of the patch and the cross slots in the ground plane.Meanwhile,a U-shaped aperture is etched in the feed lineand it can further improve the port isolation,significantly broaden the antenna bandwidth as well.An electromagnetic simulation software,HFSS,is used for simulation and optimizing the antenna＇structure parameter.The simulation results show that,the antenna can work at 2.36 GHz and 5.44 GHz,the relative impedance bandwidth is over 10.6%（2.21GHz-2.46GHz）and 4.8%（5.31GHz-5.57GHz）,respectively.The isolation is found to be as low as-30 dB,and the maximum gain can be 4dB and 5dB,respectively.