Design of dual-polarized slotted waveguide array

A dual polarized waveguide slotted array antenna is presented. A 45deg slant left polarization slot array is interlaced with a 45deg slant right polarization slot array within a common antenna structure to provide the capability of transmitting and receiving simultaneous dual orthogonal linear polarization states. The signals exhibiting dual orthogonal polarization states can have the same frequency range or different frequency bands. The design has a compact structure by the use of ridged waveguide slot radiators. Advantageously, it can be fed by a waveguide-implemented distribution network mounted to the rear of the antenna to broaden the bandwidth. A dual circularly polarized waveguide slotted array can also be realized by the use of a 3-dB coupler.