Design and Optimization of Ka-band Circularly Polarized Folded Reflectarray Antenna
Based on the principle of 1/2 folded reflective metasurfaces,the design method and performance optimization steps of 1/n folded reflective metasurfaces are further studied.The goal is to design a circularly polarized array that can simultaneously consider array efficiency and profile height.The folding array architecture adopts one layer of polarized reflection unit,one layer of circularly polarized transmission layer,and a circularly polarized feed source.A right-handed circularly polarized metasurface unit is studied,and simulation results showed that the unit has good polarization selection characteristics in the frequency range of 25～35 GHz.A polarization conversion reflection unit is designed,and simulation results show that the unit has good polarization conversion characteristics in the frequency range of 25～35 GHz.A phase calculation method for 1/n folded super reflective surfaces is proposed and studied,and the performance of antenna arrays is optimized through simulation.In order to verify the proposed method,simulation and testing are conducted on a 31×31 circularly polarized folded array with a profile height ratio array aperture of 0.287.The test results are consistent with the simulation results.The test results show that the designed circularly polarized folded array has an aperture efficiency of 36.1％,a1 dB gain bandwidth of 3.6％,a 3 dB gain bandwidth of 11.4％,and a 3 dB axial ratio bandwidth of 16.6％.The proposed method effectively balances antenna efficiency and antenna profile,providing a new research approach for high-performance folded array design.
万方数据
维普
