Analysis and Design of Double-mitered Right-angle Bend based on Planar Circuit Model and Rigorous Equivalent Network

Strip-line right-angle bend is a key component for MIC. It has been demonstrated that right-angle bend with proper cut can improve the frequency characteristics of no-cut right-angle bend. However their characteristics are deteriorated with frequency, which can be improved again by double-mitered structure. In this paper how to analyze the double-mitered right-angle bend is explained based on 2-D planar circuit model and rigorous equivalent network. The analysis demonstrates the mechanism of no reflection and guideline for design. Also effective equivalent network of 45 degree planar junction for dominant mode will work well for analysis and design of the double-mitered structure. Finally dynamic behavior of 2-D field distribution is calculated and shown, which will help to understand the operation of double-mitered bend.