WIDE-BEAM PLANAR CIRCULARLY-POLARIZED ANTENNA

Disclosed is a wide-beam planar circularly-polarized antenna. Planar fan-shaped magnetic dipoles which have the same structure and are arranged in an anti-symmetric manner, and V-shaped electric dipoles which are arranged in an anti-symmetric manner are separately designed on a dielectric, and a time phase difference of 90 degrees is achieved by using a phase conversion stripline, so that the antenna has a wide-beam circularly-polarized radiation characteristic. The circularly-polarized antenna achieved in the invention has a front-to-back ratio of 15 dB or more, and can achieve a hemispherical circularly-polarized wave beam with a width of 180 degrees, which is controlled by an angle by which the V-shaped electric dipoles rotate around the central axis of the fan-shaped magnetic dipoles, and the shapes and widths of the V-shaped electric dipoles separately. The maximum radiation direction is parallel to the plane where the antenna is located and a relatively high impedance bandwidth is achieved. The characte