Propagating Solution of Point Source Excitation Electromagnetic Wave in from Time-Varying Media Sphere Space

The electromagnetic propagation solutions of point source in a time-varying media of higher space were studied.According to the boundary conditions,inhomogeneous wave equation of point source before the media changing abruptly and the homogeneous wave equation after the media changing abruptly were constructed.Employing the traditional separation of variables,the solutions of the(equations) were obtained and figures in the 1D case were depicted to testify the solutions.After the(media) changing abruptly,the initial wave was splitted into the forward(traveling) wave and backward(traveling) wave.Two phenomena were generated,one was called energy focusing the other was called(frequency) shift.