A matched lumped element five-port which is based on the comparator circuit

Recently, a very broadband matched lumped element symmetrical five-port was described. The synthesis of this circuit required 23 ideal transformers. An alternate lumped element broadband matched five-port is described that requires only four frequency invariant 180° hybrids for its synthesis. The linear S matrix element-S matrix eigenvalue relations for this nonsymmetrical five-port are derived. These are used to design a broadband lumped element five-port which is matched at each port. A practical realization using four flatpack 180° hybrids is described and the experimental performance given