【摘要】 针对毫米波被动成像应用,设计了工作频率为84～94 GHz的16阵元焦平面阵列天线.聚焦天线采用500 mm口径的旋转抛物面以获得0.47°角分辨率;16馈源排成4×4阵列,相邻列馈源在垂直方向交错排列,使天线在垂直方向采样波束密度增加一倍,满足Nyquist采样要求;采用电流分布法并利用MATLAB编程计算馈源偏焦时天线辐射场分布,对馈源阵列排列参数进行优化设计.成像实验结果表明,天线沿水平方向扫描一次即可获得场景成像二维完全采样数据,成像耗时比传统扫描采样方式减少一倍.更多还原

【Abstract】 A 16-element focal plane linear array(FPLA) operating at 84~94GHz for passive millimeter-wave imaging was designed.The parabolic reflector with 500mm diameter was used to obtain an angular resolution of 0.47°.The 16 feed-horns are arranged as 4×4 array and the adjacent feed-horns are stagger at vertical direction,which doubles the scene sampling density in vertical direction and satisfies Nyquist theorem.The radiation field of the antenna was calculated in MATLAB by using current distribution method,and the location of the feed horns was optimized based on the results.Imaging results indicate that the full sampling imaging data of scene can be obtained when the FPLA scanning is done in horizontal direction for only one time and imaging time is reduced to half that of the traditional scanning way.更多还原