Designing a symmetrical five-port waveguide junction

Studies have shown that for a symmetrical five-port junction to be used in a six-port reflectometer set-up, it should ideally be matched over the operating bandwidth. Using the results obtained from an electromagnetic model, a suitable symmetrical five-port E-plane waveguide junction (with five attached H-plane tapers) was designed. The junction-with-tapers prototype when tested yielded a residual mismatch of less than 0.18 over the entire waveguide bandwidth.