A novel synthesis method for millimeter-wave antenna with contoured-beam at near-field region

The paper proposed a new method to synthesis circular aperture mm-wave antennas with contoured beam wave in near-field. With derivation on the near-field integral calculus formula of circular aperture antennas, we provided a novel algorithm to transform aperture distribution to axis distribution back and forth using fast Fourier transform(FFT) technology. Referring to the Phase-Only method widely used in far-field pattern synthesis, a method to synthesis circular aperture antennas with contoured near-field beam wave was given. To verify the proposed synthesis method, a circular reflector antenna with diameter of 1.2m and works at frequency of 95GHz was synthesized, an uniform beam wave with quasi-constant power density and beam radius at distance range from 25 m to 100 m was obtained in the near-field, the relative difference is below 10%. At last a reflector with diameter of 0.3m was designed and tested, the tested results is fit well with simulated results.