【摘要】 本文首先研究了天线时域辐射远场的基本原理,建立了计算公式.在此基础之上,分析了相控阵天线工作在窄脉冲条件下的时域辐射场,发现其时域方向性(如:时域远场峰值方向图、时域远场平均功率方向图)与频域方向性(频域远场方向图)并不一致,这种不一致性随着天线口径的增大或脉冲宽度的变窄而愈加明显,并且在天线注满时间之内表现得尤为突出.文章由此指出:对于超宽带超低副瓣相控阵天线来说,其性能用时域指标去衡量胜于用频域指标去衡量的新观点.更多还原

【Abstract】 Some basic principles of time domain electromagnetic field radiated by any kind of sources,especially by phased array antenna are presented.From the principles,we find the differences of radiating properties between time domain antennas and frequency domain antennas.And it is possible to describe the radiating properties of a time domain antenna using time domain signal distribution on a far field spherical face.The time domain electromagnetic fields of a ultra wide band ultra low side lobe phased array antenna have many new fashions,which are very difficult to be(described)in frequency domain.So it is very necessary to develop time domain methods to describe an ultra wide band ultra low side lobe phased array antenna.更多还原