The invention provides a circularly polarized F-P
resonant cavity antenna with high
gain and low RCS, and aims to simplify the structure of the antenna and reduce the manufacturing cost of the antenna. The antenna comprises an upper
dielectric plate and a lower
dielectric plate, a wave-absorbing surface is printed on the upper surface of the upper
dielectric plate, a
partial reflection surface isprinted on the lower surface, the wave-absorbing surface comprises N*N wave-absorbing units arranged in a periodic manner, the wave-absorbing units adopt annular patch structures, four edges of the wave-absorbing units are provided with gaps, resistances are loaded on the gaps, the
partial reflection surface comprises N*N
partial reflection surface units arranged in a periodic manner, the partialreflection surface units adopt square patch structures, the center of each partial reflection surface unit is provided with a
cross slot with different length and width, four edges of the partial reflection surface unit are provided with rectangular grooves, a rectangular
metal patch is printed on the upper surface of the lower
dielectric plate, a floor is printed on the lower surface, the rectangular
metal patch and the floor are connected through a
coaxial line, and a high-impedance surface formed by an area array formed by periodic arrangement of a plurality of strip-shaped
metal patches isprinted around the rectangular patch.