高极化纯度的超表面透镜设计与应用

发布时间：2018-05-11 05:57

  本文选题：透镜 + 各向异性超表面　； 参考：《物理学报》2017年20期

【摘要】：针对超表面在透镜方面的应用,基于各向异性超表面单元设计了一款高极化纯度的聚焦超表面透镜,并探讨了其在高增益高极化纯度天线方面的应用.设计了一款具有极化滤波特性的各向异性超表面单元,单元对x极化波保持高透性的同时,对y极化波保持近乎为零的透射率.利用该型单元设计了焦距为30 mm、阵列大小为105 mm×105 mm、单元数为21×21的聚焦超表面透镜.根据光路可逆原理,焦点处发出的球面波被超表面透镜有效转化为平面波,从而达到提高天线增益的目标.实验中分别用不同极化形式的球面波照射聚焦超表面来研究超表面对不同极化波的控制特性.结果表明,x极化波照射时,超表面工作于透镜模式,球面波转化为平面波,天线增益大大提高;y极化波照射时,超表面类似于金属板,将入射波全部反射;x/y极化混合波照射时,天线增益大大提高,且极化隔离度高于25 dB,充分说明设计的聚焦超表面在提高x极化波增益的同时可高效滤除y极化波,达到了高增益高极化纯度的目标.
[Abstract]:Aiming at the application of hypersurface in lens, a focused hypersurface lens with high polarization purity is designed based on anisotropic hypersurface element, and its application in high gain and high polarization purity antenna is discussed. An anisotropic supersurface element with polarization filtering property is designed. The element maintains high permeability to x polarization wave and near zero transmittance to y polarization wave at the same time. The focal length is 30mm, the array size is 105mm 脳 105mm, and the number of units is 21 脳 21. According to the principle of reversible optical path, the spherical wave emitted at the focal point is effectively converted into a plane wave by the super-surface lens, thus achieving the goal of improving the antenna gain. In the experiment, spherical waves with different polarization forms are used to illuminate the supersurface to study the control characteristics of the supersurface to different polarization waves. The results show that the supersurface works in the lens mode, the spherical wave is converted into plane wave, and the antenna gain is greatly improved. The supersurface is similar to the metal plate, and when the incident wave is reflected completely, the x / y polarization mixed wave is irradiated. The antenna gain is greatly improved, and the polarization isolation is higher than 25 dB, which fully shows that the designed focusing supersurface can filter the y polarization wave efficiently while increasing the x polarization wave gain, and achieve the goal of high gain and high polarization purity.
【作者单位】： 空军工程大学防空反导学院;
【基金】：国家自然科学基金(批准号:61372034)资助的课题~~
【分类号】：TN820
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本文编号：1872685