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为解决无源雷达吸波材料带宽有限的问题,基于传输线理论设计了一种有源可调微波吸收体.该吸收体是在Salisbury屏的拓扑结构基础上,用基于PIN二极管可控的有源频率选择表面(FSS)代替传统的电阻层.反射率测量结果表明,通过改变二极管的偏置电流可以动态调节吸收体的最佳吸波频率;当偏置电流在0~0.5 m A之间变化时,吸收体的最佳吸波频率在7~12.5 GHz频率范围内动态调整.基于遗传算法,优化设计了一种具有双极化吸波特性的十字型可调微波吸收体,仿真结果表明该吸收体在5.6~17.6 GHz范围内实现了最佳吸波频率的可控迁移.
In order to solve the problem of limited bandwidth of passive radar absorbing material, an active adjustable microwave absorber is designed based on transmission line theory.The absorber is based on the topology of Salisbury screen, Frequency selection surface (FSS) instead of the traditional resistance layer.The reflectance measurement results show that by changing the bias current of the diode, the optimal wave absorption frequency of the absorber can be dynamically adjusted; when the bias current varies from 0 to 0.5 m A , The optimal absorption frequency of the absorber is dynamically adjusted in the frequency range from 7 to 12.5 GHz.Based on the genetic algorithm, a cross-shaped adjustable microwave absorber with dual polarization absorption characteristics is optimized and the simulation results show that The absorber achieves a controlled migration of the optimum absorption frequency in the 5.6 ~ 17.6 GHz range.