Wideband Radar Cross Section Reduction of Slot Antennas Arrays
Wideband Radar Cross Section Reduction of Slot Antennas Arrays
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DOI：
10.1109/tap.2013.2287888
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发表时间：
2014-01-01
影响因子：
5.7
通讯作者：
Monorchio, Agostino
中科院分区：
文献类型：
--
作者：
Genovesi, Simone;Costa, Filippo;Monorchio, Agostino
针对阵列天线在保持其辐射性能的同时，减小其雷达截面（RCS）的问题，进行了综合分析。以微带槽阵为例，对所提出的雷达截面减小（RCSR）策略进行了验证。结果表明，通过在辐射孔前采用一组周期性电阻元件，可以在两个八度宽的频带内显著降低雷达特征。研究了所提出结构的单稳态和双稳态RCS，包括正入射和斜入射。深入分析了周期电阻图的不同排列方式和几何形状，分析了它们在天线增益和散射场水平方面的优点和缺点。此外，还考虑了利用金属寄生元件来提高天线增益，并考虑了光栅瓣的外观，讨论了金属寄生元件的存在所引起的散射现象。采用二维彩色图表示辐射场在频域和空域的变化，分析了天线的设计。所提出的示例所说明的准则可以很容易地应用于其他天线体系结构。
A comprehensive analysis aimed at reducing the radar cross section (RCS) of array antennas, preserving at the same time their radiating performance, is presented. A microstrip slot array is considered as a test case to illustrate the proposed strategy for radar cross section reduction (RCSR). It is shown that a remarkable reduction of the radar signature can be accomplished over a frequency band as wide as two octaves by employing an array of periodic resistive elements in front of the radiating apertures. The monostatic and bistatic RCS of the proposed structures are investigated both for normal and oblique incidence. Different arrangements and geometries of the periodic resistive pattern are thoroughly analyzed showing the benefits and the drawbacks in terms of antenna gain and level of the scattered fields. Furthermore, the use of metallic parasitic elements for enhancing the antenna gain is considered, and the scattering phenomena caused by their presence are addressed, taking into account the appearance of grating lobes. The antenna designs are also analyzed by resorting to a bidimensional color plot presenting the variation of the reradiated field both in frequency and spatial domain. The guidelines illustrated by the proposed examples can be easily applied to other antenna architectures.