High-gain low-profile circularly polarized antenna

A high-gain low-profile circularly polarized antenna, comprising a circularly polarized patch at a top, a composite dielectric high-impedance surface array in a middle, and a metal backplate at a bottom;

• wherein the circularly polarized patch comprises a patch dielectric layer, wherein a first fan-shaped patch, a second fan-shaped patch, a third fan-shaped patch, and a fourth fan-shaped patch are formed on an upper surface of the patch dielectric layer, and the first fan-shaped patch, the second fan-shaped patch, the third fan-shaped patch, and the fourth fan-shaped patch are not in contact with each other;
• four coaxial feeding lines are arranged at positions that are close to a center of the patch dielectric layer, each of the coaxial feeding lines is vertically arranged, an upper end of the each of the coaxial feeding lines is electrically connected to one corresponding fan-shaped patch of the a first fan-shaped patch, a second fan-shaped patch, a third fan-shaped patch, and a fourth fan-shaped patch, and the other end of the each of the coaxial feeding lines penetrates the patch dielectric layer to extend to an outside of a lower surface of the patch dielectric layer.