脉冲电磁辐射的分析理论
A Theory for Analysis of Pulse Electromagnetic Radiation
摘要：
本文提出了一种分析自由空间中脉冲辐射器辐射能量和无功能量的理论。利用所提出的无功能和辐射能的定义，建立了任意观测面上的功率平衡，直观地表明坡印廷矢量不仅包含与辐射能相关的功率通量密度，而且还包含无功能涨落受源拖曳的影响。定义了一个新的辐射功率通量密度矢量。精确计算了辐射体周围观测面的辐射能。数值结果表明，提出的辐射通量密度比坡印廷矢量更适合表达辐射功率通量密度。
英文摘要：
A theory for analyzing the radiative and reactive energies for pulse radiators in free space is presented. With the proposed definition of reactive energies and radiative energies, power balance at arbitrarily chosen observation surfaces are established, which intuitively shows that the Poynting vector contains not only the power flux density associated with the radiative energies, but also the influence of the fluctuation of the reactive energies dragging by the sources. A new vector is defined for the radiative power flux density. The radiative energies passing through observation surfaces enclosing the radiator are accurately calculated. Numerical results verifies that the proposed radiative flux density is more proper for expressing the radiative power flux density than the Poynting vector.
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