阻抗型FSS在阵列天线RCS减缩中的应用

设计了一种环状阻抗型频率选择表面吸波结构,并对其单元的电磁特性进行了详细分析.在此基础上将该阻抗型频率选择表面吸波结构应用于微带阵列天线雷达散射截面的减缩中.阻抗型频率选择表面结构由周期排列的频率选择表面单元组成,每个单元均由3个阻抗环构成,阵列天线为2×2的微带贴片天线阵,并将阻抗性频率选择表面结构排列在阵列天线单元之间.仿真结果表明,该结构可在6~22GHz频段内表现出良好的吸波特性.将其加载于微带阵列天线时,对天线的辐射特性产生的影响较小,且天线的单站雷达散射截面减缩效果明显,最大减缩量可达27dB,实现了宽带、宽角域的天线雷达散射截面减缩.

Resistive FSS applied to the RCS reduction of array antennas

A ring-shaped resistive frequency selective surface (FSS) microwave-absorbing structure is designed and applied to the RCS reduction of the microstrip antenna array. The resistive FSS structure is constructed from resistive treble-square loops arranged in a periodic array. An array with four patch elements is designed, and the resistive FSS is located between two patch elements. Simulated results show that the proposed structure shows a good microwave absorbing characteristic in the frequency range of 6GHz to 22GHz. When loaded in a microstrip antenna array, the RCS of the array antenna can be reduced to the maximum of 27dB with little impact on the antenna's radiation characteristic. And the control of the wideband RCS of the antenna can be realized with this structure.