电偶极辐射。辐射场，近场。辐射功率。实例：圆周运动之电荷。
Electric Dipole Radiation. The Radiation Field, the Near Fields. Radiated Power. Example: Charge in Circular Motion.
在漂移区中考虑直流空间电荷场的影响。我们发现电子运动在该区服从一振荡方程；
We find out that, in drift, region, the motion equation of electron is an oscillation one, which influences the prcbunching of electrons.
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