A Linearly Polarized Holographic Metasurface Antenna Loaded with SIW and Its Gain Enhancement Analysis

In this paper, a design method for a linearly polarized antenna is proposed by combining the principle of optical holography and the structure of a center-fed parallel-plate waveguide. By loading the slit cell at a specific location in the top layer of the parallel plate, the slit cell can generate a beam by coupling a reference wave excited by a feed. And by adjusting the slit orientations, linearly polarized light beams can be generated in different directions. The antenna offers the advantages of a low profile, small size, and eliminates the need for a separate feed network. Also, to enhance the gain of this antenna, we propose a method to load the substrate integrated waveguide (SIW) around the antenna. The gain of the metasurface is further enhanced by reducing the reference wave energy leakage, and finally the correctness of the method is verified by electromagnetic simulation results.