Design of A MMW Circularly Polarized Lens Antenna

A wideband circularly polarized millimeter wave lens antenna is proposed in this paper. The antenna consists of a Fresnel dielectric lens, a polarizer, and a linearly polarized antenna source. The Fresnel dielectric lens and the polarizer are integrated to transform the linearly polarized electromagnetic wave into the circularly polarized electromagnetic wave and to increase the gain of the antenna. The 3D printing technology allows the antenna to be fabricated easily with high machining accuracy, making the antenna suitable for millimeter wave antenna application. Furthermore, simulation results show that the antenna has a wide impedance bandwidth and a wide axial ration bandwidth of 47.9% and 45.5% respectively. Besides, the gain of the antenna can reach to 25.22 dBic.