时间调制准泰勒阵列天线的方向图综合

Pattern synthesis of time modulated quasi-Taylor array

为了获得期望的参数指标,提出了一种基于时间调制的准泰勒阵列天线设计方案,该方案通过对动态单元接通时长进行简化处理并适当降低目标旁瓣电平值来实现。为了降低旁带辐射,进一步采用差分进化算法对动态单元的通断时刻进行优化,使得控制动态单元的时间脉冲发生移位来抑制谐波电平。基于MATLAB的仿真结果表明,与原始的泰勒综合方法相比,新方案不但有利于简化时间调制阵列中数字控制电路的设计,而且能够在获得相同、甚至更低旁瓣电平的情况下,使谐波电平值降低5 dB以上,并且也降低了主方向图的功率损耗。

A method is presented in this paper for designing a quasi-Taylor array based on time modulated technique. The scheme achieves the desired parameter through simplifying the time duration of dynamic el- ements and appropriately reducing the target sidelobe level. In order to reduce the sideband radiation, the differential evolution algorithm is adopted to optimize the on-off time instant of dynamic elements so that the time pulses are shifted to suppress the harmonic level. Simulation results based on MATLAB indicate that under the circumstance of same or even lower sidelobe level, the method in this paper can not only simplifies the design of digital control circuit in TMAA, but also enalbes the harmonic level to reduce at least 5 dB, and the main beam power loss is also reduced in some degree.