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针对目前双圆极化反射阵天线应用需求及发展限制,设计了一个结构简单,高隔离度的双层双圆极化反射阵天线,并首次完成了双圆极化反射阵波束赋形的应用设计。该天线上层为基于圆极化选择表面(CPSS)的单元结构,用来控制左旋圆极化(LHCP)入射波的反射同时透射右旋圆极化(RHCP)入射波,下层采用容性加载环缝隙结构对RHCP入射波进行波束控制。在双圆极化波入射条件下,所设计的16×16阵元反射阵最大增益均达到25dB,交叉极化电平小于-20.5dB,与对应单层阵辐射模式吻合。双圆极化反射阵波束赋形的实现证明其在空天领域具有重要的应用价值。
In view of the current application requirements and development limitations of birefringent reflector array antenna, a double-layer birefringent reflector antenna with simple structure and high isolation is designed and the application of birefringence beam shaping is completed for the first time design. The upper layer of the antenna is a unit structure based on a circular polarization selective surface (CPSS), which is used to control the reflection of left-handed circularly polarized (LHCP) incident waves and transmit the right-handed circularly polarized (RHCP) incident waves. The lower layer adopts a capacitive loading ring The slot structure controls the RHCP incident wave. Under the condition of double-circular polarization, the designed maximum gain of 16 × 16 array reflector array reaches 25dB and the cross-polarization level is less than -20.5dB, which is consistent with the corresponding single-layer array radiation pattern. The realization of double circularly polarized reflection array beamforming has proved that it has an important application value in the field of space and sky.