A New Approach to Analytical Calculation of Microstrip Directional Couplers with Full Structure Symmetry

摘要

A new approach to analytical calculation or directional couplers that have two symmetry planes, which is based on using input impedances of co-phase (symmetrical) and opposite-phase (asymmetrical) partial two-poles is suggested. Examples of using such approach for calculations of directional couplers on the basis of a coupled lines segment with three directivity types are discussed.