Compact beam scanning antenna based on reconfigurable antenna and phase shifter

The invention discloses a compact beam scanning antenna based on a reconfigurable antenna and a phase shifter. The compact beam scanning antenna comprises a feed network and a plurality of antenna units, the antenna unit comprises a feed structure, a phase shifter layer and a radiation layer of the antenna unit which are sequentially arranged from bottom to top; the feed structure of the antenna unit is used for converting a TE10 mode in the substrate integrated waveguide into a TEM mode on the microstrip line at the input end of the phase shifter, so that energy in the substrate integrated waveguide is fed into the antenna unit in a constant-amplitude manner; the phase shifter layer is used for controlling the phase of the antenna unit; the radiation layer is used for radiation of electromagnetic waves. And the feed network is used for transmitting energy, and enabling the energy fed into the system to enter the feed structure of the antenna unit in a constant-amplitude and same-phase manner. The antenna pro