A waveguide tee is a 3 port device that is similar to a power divider. When the axis of the side arm is parallel to the Electric Field (E) of the collinear, then the tee is called a E-Plane Tee Junction. The outputs we get in this type of tee are 180° out of phase with each other, irrespective of from which port the input is fed.

If the input signal is fed to port 3, then the output will be split across port 1 and 2 and will be 180 degrees out of phase with each other.

If the input signal is fed to port 1, then the output will be split across port 2 and 3 and will be 180 degrees out of phase with each other.

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