groove gap waveguide (ggw) h-plane horn ‎antenna and a method for its back lobe ‎suppression

Recently a new structure called groove gap waveguide (ggw) is introduced to implement low loss microwave component devices especially for millimeter wave applications. this paper presents a new type of h-plane horn antenna making use of this new technology in which backward radiation is significantly suppressed by introducing a high impedance surface at the antenna aperture. the high impedance surface that we used as the back lobe suppressor is a corrugated surface. the designed antenna is simulated by hfss and its radiation performance is compared with an ordinary ggw h-plane horn in which no back lobe suppression mechanism is used. results show a significant improvement in back lobe suppression and gain enhancement by the proposed structure.