一种新型超宽带紧耦合天线阵列设计

Design of a Novel Ultra-Wideband Tightly Coupled Antenna ArrayDesign Array

针对紧耦合天线阵列（Tightly Coupled Array，TCA）安装于飞机、导弹、舰船等平台时接地板严重影响其阻抗带宽的问题，将栅格形阻性频率选择表面与交指型偶极子天线单元相结合，设计了一种新型多层结构的超宽带TCA。采用CST对加载与未加载栅格形阻性频率选择表面时TCA的性能进行了比较分析。结果表明：未加载时，受接地板影响其最佳阻抗带宽（VSWR〈2）为4．5：1（2．1～9．5GHz）；加载后，TCA可克服接地板的影响，其阻抗带宽可达10．4：1（1．8～18．8GHz）。

The impedance bandwidth of tightly coupled array （TCA） is greatly effected by the ground plane when it is in- stalled on the platform of airplanes, missiles and naval ships. In view of this question, a novel ultra-wideband TCA with multilayer structure was designed by grid resistance frequency selective surface and interdigital dipole antenna. The perfor- mance of TCA with and without grid RFSS was compared by CST, the simulated result showed that the effect of ground plane was greatly restricted by loading a grid RFSS, the impedance bandwidth （VSWR〈2） of TCA with grid RFSS was 10.4 ： I （1.8-18.8 GHz）, while without grid RFSS the best bandwidth was 4.5 ： 1 （2.1-9.5 GHz）.