Fig. 3
From: A full Ka band gap waveguide based slot array antenna with 45° slant polarization

Geometry of radiating E-plane groove gap waveguide fed with 45° linearly polarized radiating element.
From: A full Ka band gap waveguide based slot array antenna with 45° slant polarization

Geometry of radiating E-plane groove gap waveguide fed with 45° linearly polarized radiating element.