CURRENT-EXPANSION TECHNIQUE FOR CHARACTERIZATION OF WAVE-GUIDE DISCONTINUITIES OF IRREGULAR SHAPE

A current-expansion technique is proposed to analyze the waveguide dis continuities of irregular shape. Roof-top and rectangular-pipe subdoma in functions are used in an electric-field integral-equation formulati on to adequately expand the three-dimensional current densities of an irregularly-shaped conductor. It is therefore applicable to quite gene ral discontinuity configurations. Numerical results for a variety of w aveguide discontinuities including open-ends, bends, and TT junctions have been demonstrated and verified by the available published data.