基于手性超材料的双频带线偏振转换器设计

Design of dual-band linear polarization transformer based on chiral metamaterials

设计了基于平面复合手性超材料(CCMM)不对称传输效应的高效双频带线偏振转换器,并通过仿真和实验进行了验证.结果表明:仿真测得在谐振频点9.6和10.8 GHz处,正入射的y(x)轴线偏振波沿着-z(+z)轴方向通过CCMM板时交叉偏振透射系数超过0.9,共偏振透射系数小于0.2,与实验结果符合较好.线偏振不对称传输系数以及沿着-z轴传输的x轴偏振波总的透过率在谐振频点附近都达到0.9.进一步计算得到:入射的y(x)轴线偏振波沿着-z(+z)轴方向通过CCMM板后仍然为纯度较高的线偏振波,但偏转了90°.通过CCMM单元结构电场分布特性进行了进一步验证.

A dual-band high-efficiency linear polarization transformer based on planar composite chiral metamaterial(CCMM) with asymmetric transmission effect was designed, and then simulation and experiment were performed. Results indicate that at the resonant frequencies 9.6 and 10.8 GHz, the cross-polarization transmission coefficient is over 0.9, and the co-polarization transmission coefficient is below 0.2 when the normal incident linear y(x)-polarized wave passing through the CCMM slab propagation along-z(+z) axis direction,accroding well with experiment.In addition,the asymmetric transmission coefficient and the total transmission coefficient for x-polarized wave propagation along the-z axis direction are both up to 0.9. Further calculation indicate that the incident of y(x)-polarized wave propagation along the-z(+z) axis direction pass through the CCMM slab is still linearly polarized wave with high purity,while the polarization direction is rotated by 90°,which was further verified by the electric field distribution characteristics of the CCMM unit structure.