Modeling a Class of Four-port Dual-band Couplers by Transmission Line-based Wave Digital Approach

The modeling of a four-port coupler device using a transmission line-based wave digital (WD) approach involves representing the device as a network of transmission line sections that are connected through topological junctions. In this work, the focus is on expanding the range of microwave circuits modeled with use of the WD technique to include circuits with several ports. Different topologies of four-port dual-band couplers with open-circuited, short-circuited or stepped-impedance stubs are investigated here.