超宽带天线辐射中心的时域测量方法

摘要

A time-domain method is presented to determine the radiation centers of ultra wideband(UWB) antennas.Without considering the frequency of input pulses, the E- and H-plane radiation centers can be derived by measuring the time delay of waveforms in far field.When the maximal delay reaches the minimum, the reference point is the radiation center.The method is then applied to TEM horn, and its effectiveness and veracity are proved by simulating the model of paraboloidal reflector with TEM feeding horn.%采用时域方法测量超宽带天线的辐射中心时,找出一个参考点,使天线以此点为中心的辐射波在辐射主轴某一范围内的波形时延最小,该参考点即为天线的辐射中心.该方法无需考虑馈人脉冲的频率,仅需观察天线辐射场各方向的波形时延.用时域测量方法测量了超宽带TEM喇叭天线的辐射中心,并用TEM喇叭做为馈源的抛物反射面天线进行了验证,结果证明了该方法的可行性与准确性.