Authors: Renzun Lian
Huygens' principle (HP), extinction theorem (ET), and Franz's / Franz-Harrington formulation (FHF, which is a mathematical expression of surface equivalence principle) are the important components of electromagnetic (EM) theory, and they are generalized from the following aspects. 1) Traditional HP, ET, and FHF in homogeneous isotropic environment are generalized to inhomogeneous anisotropic lossy environment. 2) Traditional FHF for homogeneous isotropic material system is generalized to inhomogeneous anisotropic lossy material system in this Part I, and will be further generalized to metal-material combined system in future Part II. 3) The Huygens' surface in traditional HP and ET is a single closed surface. In Part I, it is generalized to the "Huygens' surface" which is constructed by multiple closed surfaces. In Part II, it will be further generalized to the "Huygens' boundary" which includes some lines and open surfaces. 4) For a material body, traditional FHF has only ability to express the external scattering field and the internal total field (the summation of scattering and incident fields) in terms of the equivalent sources on material boundary, and it is generalized to formulating the internal scattering and incident fields in this paper. In addition, the relationships among HP, ET, and FHF are studied, and it is proved that HP and ET are equivalent to each other.
Comments: 21 Pages.
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