一种基于传输零点插入的多通带频率选择表面

A surface for zero-insertion transmission multi-passband frequency selection

    摘要
  • 摘要:
      目的  针对目前多频段频率选择表面存在的通/阻带选择性能有限、调控效果差的缺点，基于传输零点插入方法，设计一种多通带频率选择表面（FSS）。
      方法  FSS单元由2层相同的组合结构和1层环形贴片结构组成，具有多个传输零点，可以通过调整物理尺寸实现对通/阻带频率的独立控制。基于FSS的等效电路法，按照其物理结构建立等效电路模型并进行分析，全波仿真与等效电路法(ECM)计算结果可以很好地拟合。
      结果  仿真结果表明，所设计的三通带FSS可在C，X，Ku频段内形成3个传输通带，位于通带两侧的零点形成了陡峭的边沿，缩短了过渡带，高频零点形成了宽传输阻带，进一步提升了带外选择性能。
      结论  所设计的FSS在工作频段内具有良好的极化稳定性和角度稳定性，且通/阻带独立性较好。

     

    Abstract:
      Objectives  Focusing on the shortcomings of limited band selection and poor control effectiveness of the current multi-band frequency selective surface, this paper designs a multi-passband frequency selection surface based on the transmission zero insertion method.
      Methods  The FSSs consist of two layers of the same combined structure and a ring-shaped patch structure. It has multiple transmission zeroes and can control the pass/stop-band independently by adjusting physical parameters. The equivalent circuit model is established according to FSS's physical structure through the equivalent circuit method. The full-wave simulation and ECM (equivalent circuit method) calculation results can be well fitted.
      Results  The simulation results show that the designed tri-passband FSS can form passbands in the C, X and Ku bands. The zero points on both sides of the passband form steep edges and a high-frequency stop band. The stop band enhances the out-of-band selection performance.
      Conclusions   The operating frequency band sees a fine polarization stability and angular stability, and the pass/stop bands have a high level of independence.

     

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