Design of a holey metasurface prism to reduce dispersion in groove gap waveguide leaky wave antennas

The dispersive nature of a leaky waveguide antenna causes the main beam direction to change with frequency. To reduce the main beam squinting effect in a groove gap leaky wave antenna, a holey metasurface prism is introduced. The prism is made of holes instead of pins as it was proposed in the past, to simplify manufacturing at high frequencies. The dispersion characteristics of the hole unit cell are studied and a first example of design is presented aiming to one degree or less variation of the main beam radiation angle. The example is designed at Ka band and the initial results are very promising.