Transverse non-uniform slotted substrate integrated waveguide leaky-wave antenna

A novel non-uniform slotted substrate integrated waveguide leaky wave antenna has been proposed. These nonuniform slots are used to reduce the side lobes and to improve the radiation efficiency. The proposed structure has enhanced antenna gain and reduced reflection loss. This leaky wave antenna works in TE₁₀ mode. Three modes are propagating in the structure; leaky wave mode, proper waveguide mode and surface wave mode. The proposed non-uniform leaky wave antenna scans efficiently from broadside to end-fires. This type of substrate integrated waveguide leaky wave antenna has very narrow beam that scans with frequency change. The current flow on the top wall is interrupted by periodic non-uniform slots, which results the leakage. The leakage is only due the fast waves.