Abstract: A directional coupler assembly includes a waveguide housing. The waveguide housing has a first segment and a second segment. A first waveguide port and a second waveguide port are disposed on opposite sides of the waveguide housing. A third waveguide port is disposed on a third side of the waveguide housing, the third waveguide port being disposed substantially orthogonal to the first waveguide port and the second waveguide port. A main coupler board is disposed between the first segment and the second segment and communicatively couples the first waveguide port, the second waveguide port and the third waveguide port.