计算对数周期偶极子天线相位中心的变步长法

Calculation for Phase Center of LPDA with Variable Step

为了提高计算对数周期偶极子天线(LPDA)视在相位中心的速度和精度,提出一种计算LPDA视在相位中心的变步长法,并计算LPDA的E面、H面视在相位中心,给出了E面、H面方向图半功率波瓣宽度内的最大相位差。最后,根据计算出的相位中心重新计算LPDA在E面、H面的相位方向图,在天线功率波瓣宽度内相位值平坦,表明该方法是有效的。

To improve velocity and precision of calculation for the phase center of LPDA,a method used ia calculation for the phase center of LPDA with the method of variable step is proposed. Then the approximate phase centers of LPDA in E- plane and H - plane are calculated and maximal differences of phase within the main lobes in E - plane and H - plane radiation patterns are presented. At last, the fluctuated curves of phase of LPDA in E - plane and H - plane are calculated based on the approximate phase centers calculated. It can be concluded from the smoothness of phases within the main lobes that the method is an effective method to calculate the LPDA＇s phase center.