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我们研制的微波辐射计是用于机载的和地面的无源探测设备,可用来接收地面上各种物质辐射的微波能量,从而判别不同的地物目标。天线是微波辐射计用来接收地物辐射能量的部件,对天线除要求高增益低旁瓣外,还要求有比较好的方向图,紧凑的结构和具有所要求的地面分辨率。如图1所示,天线尺寸(D),飞行体高度(H)和地面分辨率(r)的关系为:r=2tgθ·H天线半功率点张角2θ=1.2 λ/D(弧度)
We developed the microwave radiometer is used for airborne and ground passive detection equipment, can be used to receive the microwave radiation of various substances on the ground, in order to distinguish between different targets. Antennas are components that microwave radiometers use to receive the radiated energy of the ground object. In addition to requiring high gain and low sidelobes for the antenna, better antenna patterns, compact structures and the required ground resolution are required. As shown in Fig. 1, the relationship between the antenna size (D), the height of the flying object (H) and the ground resolution (r) is: r = 2tgθ · H Half-power point angle of antenna 2θ = 1.2 λ /