High gain terahertz antenna based on modified holographic artificial impedance surface

This paper proposes the design of a holographic artificial impedance surface antenna, which is capable of beam forming at a desired direction with improved gain for terahertz communications applications. By modifying the design method of artificial impedance surface, two parts of artificial impedance surface with out of phase impedance modulation function are obtained. Combining the two parts of artificial impedance surface together, the split in the main lobe direction of the radiation pattern can be cancelled. Then, an improved gain at the desired direction can be achieved. The design procedure of the surface, with simulation results, is presented.