Quiet zone evaluation method for offset single reflector CATR of separated transmitting-receiving feeds
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摘要: 根据Lorentz互易定理,提出了一种对收发分离偏馈单反射面紧缩场静区评估的方法.两个馈源与反射面分别构成独立的、互为测量关系的天线系统,在相同静区位置构成各自的天线口面.对这两个等效天线系统在该平面产生的电磁场进行测试,得到收发系统在静区位置各自的电磁特性.根据收发天线各自的电磁场分布,按照天线接收原理可以得到双站合成的等效静区.双站等效静区呈对称分布,但相对于单站静区分布,双站等效静区范围变小,波动更小,边缘下降更平缓.采用物理光学法对上述等效静区进行了仿真,并进一步通过实验测试对此静区评估方法的有效性进行了验证.Abstract: Based on the Lorentz reciprocity theorem, an evaluation method was proposed for the quiet zone of offset single reflector compact antenna test range (CATR) with separated transmitting-receiving feeds. Two feeds and reflector compose two separate and measured-mutually antenna systems, and there are two antenna apertures in the same quiet zone position. The electromagnetic characteristics of transmitting-receiving systems can be obtained respectively after the electromagnetic fields in the plane of two equal antenna systems were tested. The equal quiet zone fields can be obtained based on antenna acceptance theorem by transmitting-receiving antennas respective electromagnetic fields. The bistatic equal quiet zone is symmetrical and has narrower ranges, less ripple and less taper than those of monostatic. The equal quiet zone electromagnetic fields were calculated by physical optics. And this quiet zone evaluation method was verified with experiment test.
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Key words:
- antennas /
- electromagnetic fields /
- physical optics
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