An antenna structure, wherein the antenna structure comprises: a dielectric plate, a patch antenna array, a first feeding port, a second feeding port, and four feeding structures; the dielectric plate and a metal bottom plate being spaced apart at a first preset distance (h); the first feeding port and the patch antenna array being located on a first surface of the dielectric plate, the second feeding port being located on a second surface of the dielectric plate, the second surface being opposite the first surface; the patch antenna array comprising four patch antennas (01, 02, 03, 04), the four patch antennas (01, 02, 03, 04) being arranged in two rows and two columns, one of the feeding structures being comprised between two of the patch antennas in each row, one of the feeding structures being comprised between two of the patch antennas in each column; the feeding structure located between the two patch antennas in each column being connected to the first feeding port, so that the four patch antennas (01, 02, 03, 04) all generate polarization in a first direction; and the feeding structure located between the two patch antennas in each row being connected to the second feeding port, so that the four patch antennas (01, 02, 03, 04) all generate polarization in a second direction; wherein each of the four feeding structures comprises a dipole (10, 20, 30 40) and a set of parallel feed lines, wherein for each of the four feeding structures, each dipole is connected to the set of parallel feed lines, wherein each dipole is configured to excite two of the four patch antennas (01, 02, 03, 04) by coupled feeding; the parallel feed lines comprising a first feed line (11, 21, 31, 41) located on the first surface and a second feed line (12, 22, 32, 42) located on the second surface; the second feed line (12, 32) comprised in the feeding structure between the two patch antennas in each column is connected to the first surface through a corresponding through structure (13, 33); and the first feed line (21, 41) comprised in the feeding structure between the two patch antennas in each row is connected to the second surface through a corresponding through structure (23, 43). the dielectric plate and a metal bottom plate being spaced apart at a first preset distance (h); the first feeding port and the patch antenna array being located on a first surface of the dielectric plate, the second feeding port being located on a second surface of the dielectric plate, the second surface being opposite the first surface; the patch antenna array comprising four patch antennas (01, 02, 03, 04), the four patch antennas (01, 02, 03, 04) being arranged in two rows and two columns, one of the feeding structures being comprised between two of the patch antennas in each row, one of the feeding structures being comprised between two of the patch antennas in each column; the feeding structure located between the two patch antennas in each column being connected to the first feeding port, so that the four patch antennas (01, 02, 03, 04) all generate polarization in a first direction; and the feeding structure located between the two patch antennas in each row being connected to the second feeding port, so that the four patch antennas (01, 02, 03, 04) all generate polarization in a second direction; wherein each of the four feeding structures comprises a dipole (10, 20, 30 40) and a set of parallel feed lines, wherein for each of the four feeding structures, each dipole is connected to the set of parallel feed lines, wherein each dipole is configured to excite two of the four patch antennas (01, 02, 03, 04) by coupled feeding; the parallel feed lines comprising a first feed line (11, 21, 31, 41) located on the first surface and a second feed line (12, 22, 32, 42) located on the second surface; the second feed line (12, 32) comprised in the feeding structure between the two patch antennas in each column is connected to the first surface through a corresponding through structure (13, 33); and the first feed line (21, 41) comprised in the feeding structure between the two patch antennas in each row is connected to the second surface through a corresponding through structure (23, 43).