共享孔径多功能宽带阵列天线研究

Research on the shared aperture multifunction wideband array antenna

提出了一种基于子阵天线方向图频谱能量匹配的多子阵交错共享孔径宽带阵列天线设计方法.利用直线阵列天线单元激励与方向图之间存在傅里叶变换的关系,推导出子阵天线工作频率与单元激励之间的解析关系,在匹配各子阵天线激励值的基础上,采用密度加权阵的原理确定子阵天线单元的位置,实现不同工作频率下的子阵天线稀疏交错优化布阵.理论分析与实验仿真证明,该方法能够有效地抑制不同工作频率下子阵天线方向图的旁瓣峰值,使工作在不同频率下稀疏交错布阵的子阵天线方向图旁瓣峰值近似一致,抑制了栅瓣的产生,有效地拓宽了阵列天线的工作频带,实现了宽带阵列天线优化设计.

The paper presents a new technology for designing the shared aperture wideband array with multiple interleaved sub-arrays based on the energy match of sub-array excitation distribution. In view of the Fourier transform relationship between the array pattern and elements excitation, the mathematical relationship between the array working frequency and elements excitation is achieved. The interleaved thinned sub-arrays with different working frequencies are designed with the positions of the elements achieved by way of the energy match of sub-array excitation distribution and the theory of density weighted array. Theoretical analysis and experimental simulation show that the peak side-lobe levels of the interleaved sub-arrays under different working frequencies which are designed by the proposed method are restrained with the grating lobe suppressed. The multifunction wideband array is achieved as the working bandwidth of array antennas is broadened effectively.