毫米波FPA成像系统馈源天线研究

毫米波焦平面阵列（focal plane array，FPA）成像系统中，馈源天线的排列密度是决定系统空间采样率的主要因素。提出了一种新型结构的介质棒天线，相对于其他馈源天线，它具有宽频带、低副瓣、低互耦和低交叉极化，通过改变长度而不是横截面来改变天线增益等优点，易于排成紧密的馈源阵列，以更低的溢出损耗实现对透镜或反射面天线的有效照射。通过详细的理论分析、仿真和优化设计，研制了介质棒天线及其阵列并将其应用于毫米波FPA成像系统中。该系统可用于探测人体隐匿物品，成像效果较好。

Research on feed antenna for millimeter-wave FPA imaging systems

The arranging density of the feeding antenna is the main factor which decides the spatial sampling rate of the millimeter-wave focal plane arrays (FPA) imaging system. This paper proposes a new kind of dielectric rod antenna with new structure. Comparing with the other feeding antennas, it has broader wave band, lower side lobe, lower mutual coupling, lower cross polarization, and the gain can be changed by changing its length but not the section area. It is easier to form a close feed array which can realize an effective exposure to the lens or the reflector antenna with less overflow loss. A detailed theoretical analysis, simulation and optimization of the design are done to develop the dielectric rod antenna and its array. This kind of antenna is used in the millimeter-wave focal plane arrays imaging system which can detect the concealed object on the human perfectly.