A study on theory and physical mechanism of an infinitesimal current-carrying point charge
In antenna theory, the dipole hypothesis is applicable and widely used for observing the far-field radiation.However, when applied to near-field quasi-static radiation observation in geophysical surveying, the transceiver distance is often small, and thereby the source should not be treated as a dipole to avoid misfit between the observation and the modeling based on the dipole theory.To overcome such limitation, this paper first presents a new method of estimating the field generated from a dipole by dividing it into a series of infinitesimal point charge and computing both the velocity field excited by uniform-motion charge and accelerated-velocity field from accelerated charge, so that not only the far-field radiation but also the near-field quasi-static radiation can be accurately estimated.The results are well verified by the traditional methods of radiation modeling from a dipole.Then this study investigates the associated physical mechanism by developing a new equation for computing the radiated field in time-domain based on the frequency-to-time transformation, from which the relationship between a motive charge and its corresponding field is investigated.It is concluded that the field generated from dipole is in nature the same as that generated from motive charge.
Electric dipole Radiation field Point charge Near-source field
Nannan Zhou Guoqiang Xue Kang Chen
Key laboratory of mineral resources Institute of Geology and Geophysics, CAS Beijing, China
国际会议
北京
英文
22-25
2016-06-27（万方平台首次上网日期，不代表论文的发表时间）