The utility model provides a
monomer coplanar circularly polarized dual-frequency antenna, which comprises an upper-layer
radiation electrode, a
dielectric substrate, a lower-layer
radiation electrode, a reflecting layer and a
feed point needle, and is characterized in that the upper-layer
radiation electrode and the lower-layer radiation electrode are respectively mounted on the upper surface and the lower surface of the
dielectric substrate; the
feed point needle is fixed in the
dielectric substrate and is electrically connected with the upper-layer radiation electrode and the lower-layer radiation electrode in an
electromagnetic coupling mode, and the upper-layer radiation electrode comprises a first
frequency band radiation electrode and a second
frequency band radiation electrode which are detachable; a gap of a
geometric symmetry structure is arranged between the first
frequency band radiation electrode and the second frequency band radiation electrode, and the bottom of the
feed point needle is connected with the reflecting layer. The dual-frequency
circularly polarized antenna solves the problems of poor
circularly polarized radiation performance, low electrical index, low integration level,
heavy weight, poor process adaptability, low reliability, limited
working temperature and the like of the dual-frequency
circularly polarized antenna in the prior art.