Adjustment of the 4-port single-junction circulator

The 4-port junction circulator differs from the 3-port junction in that the circulation adjustment cannot be reduced to an admittance a t c h i n g procedure. To adjust the 4-port junction circulator requires setting three independent variables. A unique procedure is given for setting the three independent variables one at a time in terms of the scattering coefficients of the junction. The procedure is demonstrated on an experimental waveguide junction.