Coated antenna device

The invention discloses a coated antenna device. The coated antenna device comprises a circular polarization radiation paster, impedance conversion lines, a micro-strip feeder line, a dielectric substrate, an earth plate and a frequency selective surface coating. The circular polarization radiation paster is arranged in the center of the upper surface of the dielectric substrate in an etching mode and connected with the micro-strip feeder line through the impedance conversion lines. The earth plate is arranged on the lower surface of the dielectric substrate in an etching mode, and the frequency selective surface coating is located over the circular polarization radiation paster. The length of the edge of the square circular polarization radiation paster ranges from 13 mm to 15.5 mm, the paster is connected with the two impedance conversion lines, and the joints of the paster and the two impedance conversion lines are located on the different edges of the paster. Sixty-four square metal units are arranged on the lower surface of the frequency selective surface coating in an etching mode and are evenly distributed in an 8*8 array mode, and the area of the square metal units in each line gradually becomes small. According to the coated antenna device, the gain of an antenna can be improved, the sidelobe of the antenna can be reduced, and the performance of the antenna can be improved.