Wide-angle millimeter wave end-fire metasurface multi-beam antenna

The invention discloses a wide-angle millimeter wave end-fire metasurface multi-beam antenna which comprises a three-layer substrate integrated waveguide feed structure and a wide-angle end-fire metasurface antenna array, wherein the three-layer substrate integrated waveguide feed structure is designed based on a 9 * 9 Butler matrix; the Butler matrix feed structure comprises three dielectric substrates, metal structures printed on the tops and the bottoms of the three dielectric substrates, gap grooves etched in the metal structures, and metal cuboid blocks, metal through holes and air through holes distributed on the three substrates. The end-fire metasurface antenna array comprises nine units of end-fire metasurface antennas which are linearly arranged. According to the invention, the half-power beam width angle coverage range at the center frequency 28GHz is +/-113 degrees; in a target frequency band, the gain change range of the wide-angle millimeter wave end-fire metasurface multi-beam antenna is 7.8 dB