Complementation principle-based microstrip line antenna with reconfigurable directional diagram

The invention relates to a directional diagram reconfigurable microstrip line antenna based on a complementary principle, which comprises a dielectric substrate, a Z-shaped ring is printed on each of the upper surface and the lower surface of the dielectric substrate, and the printing position of the Z-shaped ring positioned on the lower surface of the dielectric substrate is obtained by clockwise rotating the Z-shaped ring positioned on the upper surface of the dielectric substrate by 90 degrees. A radiation wall is arranged at an opening in the middle of the Z-shaped ring, the two ends of the radiation wall are respectively connected with a folding branch knot through a PIN diode, and the two radiation walls located on the upper surface and the lower surface of the dielectric substrate are perpendicular to each other and form four electric dipoles between each other. An inner conductor and an outer conductor of the feed coaxial line are respectively welded on the Z-shaped rings on the upper surface and the