Advances in Coupling Matrix Optimization and Topology Design for Multiplexer Synthesis

Multiplexers play an important role for radio frequency combination and separation in various communication systems and remote sensing systems. In recent years, continuous innovations in computational intelligent algorithms have significantly advanced the development of multiplexer synthesis methods, especially in coupling matrix optimization and topology design. This article provides a comprehensive overview of methodologies for multiplexer synthesis and offers a complete design guide for multiplexers. It conducts a comparative analysis of different synthesis methods, providing practical guidance and suggestions for problems in various scenarios, which helps designers choose the appropriate approach based on application requirements. The focus of the article is on reporting several optimization-based techniques for coupling matrix synthesis. Then, a novel topology designed based on the optimized synthesis approaches is reported. Furthermore, the study explores channel frequency allocation schemes relevant to this new topology, thereby expanding the design boundaries of multiplexer topologies.