Electromagnetic Energy Balance Equations and Poynting Theorem
- Gaobiao Xiao
Abstract
Poynting theorem plays a very important role in analyzing
electromagnetic phenomena. The electromagnetic power flux density is
usually expressed with the Poynting vector. However, since Poynting
theorem basically focuses on the power balance in a system, it is not so
convenient in some situations to use it for evaluating the
electromagnetic energies. The energy balance issue for time varying
fields is revisited in this paper, and a set of energy balance equations
are introduced, and a modified method for evaluating power flux is
proposed.