Millimeter wave diffraction antenna based on continuous phase correction

A Cassegrain phase-correcting Fresnel zone plate antenna has been designed based on the Fresnel principle and the Cassegrain antenna design method. It consists of a suite of Fresnel zone continuous phase correcting concentric rings, and its diameter of aperture is 200 mm. Compared with the traditional paraboloid antenna, the Cassegrain Fresnel zone plate antenna has a flat and light structure. It precedes the discrete phase diffraction antenna in radiation performance. The simulation has been performed based on the physical optics method, and the test has been performed with the near-field scanning system. The test shows that, at 95 GHz the antenna has an efficiency of 65%. Its 3 dB beam widths are 0.95 and 1.05, and its gain is 44.1 dB.