Image Theory for Reflected TE/TM Wave in Waveguide

摘要

Image principle is extended to the time-harmonic problem of TE/TM wavepropagation and reflection in a waveguide. The fictious image generating the reflected field is derived with the aid of Heaviside operational calculus and a transmission line model of the waveguide. The operational calculus reveals, that the image of a point-like source in front of the waveguide discontinuity is another point-like source in the mirror image position and a line source extending from the mirror image position to infinity. The image derived with operational calculus turns out to be independent of the waveguide's transverse geometry.