基于集总电阻加载吸波器的紧耦合超宽带天线

    Ultra-wideband Tightly Coupled Antenna Array Based on Lumped Resistance Absorber

    • 摘要: 基于集总型电阻频率选择表面吸波器,设计一款超宽带紧耦合天线阵列。在天线阵列与地板之间加入两层结构集总型电阻频率选择表面吸波器,改变天线与地板之间的传输特性,有效抑制天线短路零点出现,扩展天线带宽;同时利用天线间强耦合效应,减小天线单元结构尺寸。使用集总电阻和金属环构成的吸波器代替常规阻抗型频率选择表面结构,降低天线阵列设计与加工难度,同时可有效改善天线阻抗匹配。仿真实验表明,通过调节集总频率选择表面吸波器物理结构、加载电阻阻值和天线间耦合电容值等参数,当天线单元驻波比小于3 时,可实现带宽范围达12.6:1 (1.5~19 GHz)的超宽带性能;并在2.2~18.3 GHz 范围内具有驻波比小于2 的良好匹配性能。

       

      Abstract: Based on lumped resistance FSS absorber, an ultra-wideband tightly coupled antenna array is designed. By loading multi-layered lumped resistance FSS absorbers between antenna array and ground plane, transmission property is improved, antenna short circuit zero point is restrained, and the bandwidth is broadened. Meanwhile, physical sizes of antenna units can be effectively decreased by reasonably making use of the strong coupling effect between antennas. In this paper, conventional impedance FSS is replaced by lumped resistance FSS absorber, which makes the design and fabrication of antenna array much easier, and improves the antenna impedance matching effectively, thus making it widely used in phase array applications. The simulation results show that, by tuning parameters such as the sizes of FSS absorbers, resistance values and coupling capacitance between antenna units, the bandwidth range of the antenna reaches 12.6:1(1.5 ~ 19GHz) when the standing wave ratio is lower than 3, and it reaches 8.3:1 (2.2 ~18.3GHz) when the standing wave ratio is lower than 2.

       

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