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(一)基本要求 合成孔径雷达原理样机需要一部工作在X波段,发射水平极化波的扇形波束天线。天线的波束宽度沿飞机航向(E平面)约1°,垂直于航向(H平面)为9°,增益为30dB;或在H平面上于11°的波束宽度内,将波束赋形为CSC~2(?)((?)为波束宽度),增益为27dD。天线的结构要适于作侧视安装。 (二)方案选择 满足以上条件的天线方案有三类:(1)以线阵作照射器,柱形抛物面作反射器的复合天线;(2)以线阵作辐射器,外加有一定张角的两块板构成线阵喇叭形天线;(3)平面
(A) of the basic requirements Synthetic Aperture Radar prototype requires a work in the X-band, transmitting horizontal polarized wave fan beam antenna. The beamwidth of the antenna is about 1 ° along the heading of the aircraft (E plane) and 9 ° perpendicular to the heading (H plane) with a gain of 30 dB. Or, the beam is shaped as CSC ~ 2 (?) ((?) Beamwidth) with a gain of 27dD. Antenna structure should be suitable for side view installation. (B) the choice of programs to meet the above conditions, there are three types of antenna solutions: (1) line array for the reflector, cylindrical parabolic reflector composite antenna; (2) as a linear array of radiators, plus a certain angle of view Two panels form a line horn antenna; (3) Plane