Calculation of eigenmode for square-shaped planar circuit with slant-wise corner cut -- based on stripline 3-state structure and magnetic wall symmetry

摘要

In order o calculate frequency characteristics of stripline right-angle bend with slant-wise corner cut based on Foster-type equivalent network of the planar junction (square-shaped planar circuit with slant-wise corner cut). eigenmode of the corresponding planar junction must be calculated exactly up to higher mode of necessary number. Here, utilizing symmetry of the planar junction, stripline 3-stage circuit is constructed. The equivalent network for this circuit is easily given by cascade connection of multi-transmission lines and multi-port ideal transformers, which constitutes the eigen value problem. Solving this problem gives eigenmode (eigen value and eigen function). In this report, how to develop theory is explained first and then the theory is applied to the practical problems. Numerical results demonstrate the usefulness and valid of this method.