一种低副瓣锐截止波束赋形阵列天线设计

采用联合DFP和BFGS变尺度,结合全局寻优算法,通过优化阵列各单元馈电幅度和相位分布,设计了一种满足低副瓣锐截止波束赋形要求的阵列天线.该阵列由26个印刷振子单元天线组成,各单元馈电电路采用带状线环形桥.馈电电路网络采用带状线结构,整个馈电网络和印刷天线采用一体化设计,具有插入损耗小,结构紧凑的特点.实测表明,3dB波束宽度为11°,水平面锐截止为5.83dB/(°),副瓣低于-20dB.天线设计满足指标要求,并已获得应用.

Design of an array antenna with a low-sidelobe and sharp-cutoff pattern shaping

A compact array antenna is designed with variable metric algorithms, namely Davidon-Fletcher-Powell (DFP) and Broyden-Fletcher-Goldfarb-Shanno (BFGS). Using a global optimization method, the amplitude and phase distribution of current excitations are optimized to achieve a low-sidelobe and sharp-cutoff pattern shaping. The array, consisting of 26 parallel printed dipoles, is powered by a stripline-circuit distribute network connecting 26 individual stripline ring-hybrid feed circuits. The feed circuit network and the printed antenna are designed all together, leading to a low insertion loss and a compact size. Measurements show that the bandwidth is 11° at 3dB, that the sharp cutoff on the horizon is 5.83dB/(°), and that the sidelobes are less than -20dB. The array antenna meets and exceeds demanded parameters and has been applied to a certain microwave landing system.