 A signal injected into the E-plane port will also be divided equally between ports 1 and 2, but will be 180 degrees out of phase.If signals are fed in through ports 1 and 2, they are added at the H-plane port and subtracted at the E-plane port.Thus, with the ports numbered as shown, and to within a phase factor, the full scattering matrix for an ideal magic tee is

(the signs of the elements in the fourth row and fourth column of this matrix may be reversed, depending on the polarity assumed for port 4).