The poynting vector that represent the flow of electromagnetic power density on a sphere from a linear dipole antenna is approximated by the summation of the field of segmented line current as hertz dipoles 以赫芝偶极之电磁场合成任意长度偶极天线在球面上电磁功率密度流之时变玻因亭向量。
Comparing with uncovered antennas with the same gap size , the covered antenna has higher breakdown voltage at the same optical exciting power , and it ' s thz out put is 1 . 5 times of uncovered antenna 与未钝化的光电导偶极天线相比, si3n ;钝化过的光电导偶极天线耐压能力显著提高,其辐射功率约为未钝化天线的1 . 5倍。
Thus , space - charge field in excitated photoconductor can intensity influence not only the shape of photo - electric current of pcss ' s , but also the terahertz out put of photoconducting antenna . in this paper , the forming and movement of space - charge field are simulated by means of fdtd method 触发条件下光电导体内部电场不仅显著的影响光电导开关产生超快电脉冲的功率、波形,而且对thz偶极天线的辐射功率也有明显的影响。