THz quad-beam holographic antenna with independent beam control and low sidelobe levels.

A quad-beam antenna with a controlled electromagnetic surface with high gain is proposed for THz applications. The electromagnetic surface is created based on the holographic principle. Three different designs of the quad-beam (beams in directions of (θ1, φ1), (θ2, φ2), (θ3, φ3), (θ4, φ4)) antenna based on holographic surfaces are presented to show how holographic surfaces can be tuned to provide radiation beams in different directions (by varying θ°s and φ°s) as well as with different gain values (by varying the areas of the holographic surface). In this way, these novel proposed designs provide extra degrees of freedom as compared to legacy designs. All designs are numerically evaluated and tested by simulations. [ABSTRACT FROM AUTHOR]