Electrically symmetric solution of the 3-port H-plane waveguide tee junction at the Dicke ports

The tasks of this study are to construct the eigenvalue diagram of the H-plane tee junction, at the Dicke plane which has not been done so far and to introduce a new boundary condition together with a symmetric septum. The new boundary condition introduced here has the magnitudes of the scattering parameters of a symmetric wye junction. The eigenvalue diagram of this junction has a symmetric solution about the real axis of the diagram and has been identified previously. The trial solution adopted in the construction of the Dicke eigenvalue diagram has the reference planes in the main waveguide at the characteristic planes of the junction and that at the side waveguide at a position at which the angle of the reflection coefficient there is 90° out of phase with that of the transmission coefficient between the main and side waveguides. The new junction introduced here has been fabricated experimentally in WR75 waveguide. An Altman junction is separately realised for the first time and constructed.