加载法向模螺旋天线的研究

The loaded normal mode helical antennas

采用矩量法分析了法向模螺旋天线加载后的电特性 ,探讨用加载来实现法向模螺旋天线宽带化小型化的可行性。计算时采用螺旋线段对天线进行划分 ,然后采用三角形基函数脉冲基检验的矩量法来快速精确计算天线上的电流分布。计算了一些加载螺旋天线的实例 ,并与直线段划分的矩量法的结果进行比较。最后借助遗传算法优化设计了一付工作在 2 2 0～ 4 0

The characteristics of the loaded normal mode helical antennas are analyzed by using the moment method.And the feasibility of the loaded normal mode helical antennas being used to design the broadband miniature antenna is discussed.The helical segments are employed to calculate the normal mode helical antennas, and the current on the antenna is calculated by the method of moment with triangular basis functions and pulse testing method.Some loaded normal mode helical antennas are computed, and the results are compared with those computed by linear segments algorithm.Finally a practical antenna working on 220～400MHz frequency band is designed by the presented method combined with genetic algorithm.