A current-expansion technique is proposed toanalyze the waveguide discontinuities of irregular shape. Roof-top and rectangular-pipe subdomain functions are used in anelectric-field integral-equation formulation to adequately expandthe three-dimensional current densities of an irregularly-shapedconductor. It is therefore applicable to quite general discontinuityconfigurations. Numerical results for a variety of waveguddediscontinuities including open-ends, bends, and T junctions havebeen demonstrated and verified by the available published data.
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