Analysis of stripline right-angle bend with slantwise corner cut based on Foster-type equivalent network and exact calculation of eigenmode

Stripline right-angle bend with slantwise comer cut is an important component for microwave circuits. Especially, analytical determination of the exact optimum cut is important for computer aided design of microwave circuits. An equivalent network for this structure is given by the Foster-type network based on mode theory and can be used for analysis of practical bend characteristics. The key step for this analysis is how exactly to calculate the eigenmode of the planar junction up to the necessary number. Therefore, we propose a new method using a three stage cascade-connected stripline configuration and magnetic wall symmetry. In this paper, we explain the above method in detail and calculate the eigenmode for various cut parameters. Finally, frequency characteristics of the right-angle bend with slantwise corner cut are calculated for various cut parameters, resulting in the determination of the optimum cut.