Self-duplex antenna

The invention provides a self-duplex antenna which comprises a stacking structure formed by an upper layer dielectric substrate and a lower layer dielectric substrate, a metal layer arranged between the upper layer dielectric substrate and the lower layer dielectric substrate and a square copper-clad area arranged on the upper surface of the upper layer dielectric substrate, and a strip-shaped gap and a metal through hole array are etched in the square copper-clad area. The strip-shaped gap is parallel to the diagonal line of the square copper-clad area, one end of the strip-shaped gap is open, the other end is closed, and the metal through hole arrays are distributed on the two sides, away from the strip-shaped gap, of the square copper-clad area. Compared with other self-duplex antennas based on SIW and HMSIW structural design, the self-duplex antenna has the advantage that the size of the antenna can be effectively reduced due to the fact that the 1/4 mode substrate integrated waveguide is formed by the st