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 ýintroduced to implement low loss microwave component devices ýespecially for millimeter wave applications. This paper presents a ýnew type of H-plane horn antenna making use of this new technology ýin which backward radiation is significantly suppressed by ýintroducing a high impedance surface at the antenna aperture. The ýhigh impedance surface that we used as the back lobe suppressor is a ýcorrugated surface. The designed antenna is simulated by HFSS and ýits radiation performance is compared with an ordinary GGW H-ýplane horn in which no back lobe suppression mechanism is used. ýResults show a significant improvement in back lobe suppression and ýgain enhancement by the proposed structure.ý