一种平面超宽带天线的优化设计及其分析

Analysis and Optimization of a Planar UWB Antenna

用时域有限差分法与遗传算法相结合的方法优化出一种异形单极天线,根据优化结果制作了天线。并对该天线进行了软件仿真与实际测量。三种方法比较分析,其结果基本一致;这种天线驻波比小于2.5的相对带宽超过100%;最后从频域的角度对天线的辐射特性进行了分析,结果表明所设计的天线在所需的频带内的方向图变化不大。

A kind of abnormal UWB monopole antenna is optimized by the Finite Differences Time Domain method combined with the genetic algorithm in this paper. According to optimal result, a compact planar antenna is made and carried out actual measurement. During the course of designing, they are simulated through ANSOFT HFSS9.0. The results that are achieved by these kinds of methods are similar. The relative bandwidth of the antenna with input voltage standing wave ratio less than 2.5 exceeds 100%. Finally, the radiation property for antenna is analyzed in frequency domain. Results show that the change of the directional pattern of the antenna designed is not large in the required frequency band.