Construction and Application Research of Dyadic Green Functions in Coaxial Line

The key of using DGF method to solve electromagnetic field engineering problems is to construct dyadic Green’s functions. In this paper, through constructing coaxial vector wave functions in the cylindrical coordinate system, the magnetic dyadic Green’s functions in coaxial guide wave system are studied, and the first and second kinds of electric dyadic Green’s functions are deduced by applying them to the system, and the properties of these functions and their applications in coaxial line are also analyzed. The conclusion can provide the research method and theoretical basis for DGF method to deal with the boundary value problems of electromagnetic field in coaxial guide wave system.