Exact Characterization of Septum Polarizers Exploiting Linearly Entangled Characteristics of Fully Isolated Crossover Equivalent

Fully isolated crossover equivalent (FICE) models septum polarizers (SPs) in the back-to-back (BTB) configuration, representing their symmetric crossover behavior as a perfectly isolated equivalent. The underlying linear interdependence among the FICE’s scattering parameters facilitates the exact retrieval of a single unitS-matrix. SP terminated with high-reflective loads is presented as a virtual BTB setup, enabling the theoretical derivation of the FICE using a single SP unit. The proposed technique considers all critical parameters, thereby avoiding limitations in the present BTB-based analyses with reduced measurement requirements, a simple retrieval procedure, and provides accurate and comprehensive retrieved functionality. Full-wave validation examples are provided and compared with the state-of-the-art techniques. The proposed technique is experimentally validated and compared with recent methods using a broadband SP with an irregular common port cross section.