Directional coupler with 3 input / 3 output square waveguide dual-polarization ports

This paper describes a microwave directional coupler with 3-input and 3-output square-waveguide dual-polarization ports. The proposed 6-port dual-polarization directional coupler is quite attractive as building block of passive beam forming networks, as it allows higher integration with respect to known solutions based on 4-port directional couplers.