摘要
给出一种适用于移动台的平面型紧凑极化分集天线。该天线由两个十字交叉的微带分支提供极化分集。每一分支都有单独的微带 -垂直探针馈电系统 ,并在分支上蚀刻有一个细槽以提高两个端口的隔离度。通过电容加载大大缩短了分支长度。利用时域有限差分法 ,在 90 0MHz频段对该天线进行了分析和优化。天线模型的测量结果与仿真结果基本吻合 ,在约 5 %的带宽内两个端口的隔离度大于 2 0dB、回波损耗均低于 - 10dB。该天线两端口的包络相关系数远小于 0 1,能够满足分集的要求。
This paper presents a compact planar polarization diversity antenna for mobile terminal. The antenna has two crossed microstrip branches, which can provide polarization diversity. Each of the crossed branches has an exclusive microstrip vertical via feed system. To further increase the isolation between the two ports, a slot is etched on each of the crossed branches. The length of each branch is reduced considerably by using capacitive loads. Using the finite difference time domain (FDTD) method, the antenna is analyzed and optimized at the 900MHz frequency band. The antenna model is verified experimentally and a reasonable agreement between the FDTD simulation and measurement results is obtained. A bandwidth of 5% is achieved, over which the return losses for both feed ports are less than -10dB and the isolation between the two ports is larger than 20dB. Envelope correlation of the two ports is much less than 0.1 and meets easily the requirement for achieving diversity.
出处
《电波科学学报》
EI
CSCD
2003年第5期593-595,共3页
Chinese Journal of Radio Science
基金
教育部 2 0 0 0年度跨世纪优秀人才培养计划基金
高科技发展计划资助项目(2 0 0 1AA12 30 4 3)
关键词
移动台
平面天线
紧凑极化分集天线
时域有限差分法
mobile terminal, planar antenna, polarization diversity, finite difference time domain method
