附加延时线的阵列天线模式项RCS减缩优化  

Antenna-mode RCS reduction optimization for array antennas with additional delay lines

作　　者：王文涛[1] 张鹏飞[1] 龚书喜[1] 王兴[1] 洪涛[1] 路宝[1] 

机构地区：[1]西安电子科技大学天线与微波技术重点实验室,陕西西安710071

出　　处：《西安电子科技大学学报》2011年第2期124-128,共5页Journal of Xidian University

基　　金：中央高校基本科研业务费资助项目(JY10000902009);国家自然科学基金资助项目(60801042)

摘　　要：减缩天线雷达散射截面时需要保证天线的基本辐射性能,这使得对其带内的雷达散射截面控制变得十分困难.为此,提出了加载不等长延时线的方法来实现阵列天线模式项雷达散射截面的减缩.由于天线模式项散射实质上是天线接收的入射能量经馈电内部不匹配处反射而从天线再次辐射所致,当给阵列单元与馈电网络之间接入一组延时线后,辐射能量只经过这组延时线一次,而散射能量却要通过两次.因此,优化每根延时线长度,调整辐射与散射间的相位差,就可在天线基本工作性能不变的前提下减缩其雷达散射截面.对双站、单站雷达散射截面减缩的实例表明,采用上述方法可使天线模式项雷达散射截面减缩14 dB以上.The radiation performance of an antenna must be ensured when reducing the antenna radar cross section（RCS）,which makes the in-band RCS difficult to control.For this reason,this paper presents the method of loading delay lines with a varying length to achieve the antenna-mode RCS reduction of an array antenna.Antenna-mode scattering is essentially the reradiation of reflected energy,which comes from the electromagnetic wave received by the antenna and reflects at the mismatched point of the feed network.When a group of delay lines is loaded between the array elements and the feed network,the radiation energy passes through these delay lines once,while the scattering energy passes them twice.Therefore,by optimizing the length of each delay line and adjusting the phase difference between radiation and scattering,the antenna RCS can be reduced with a little degradation in radiation performance.The proposed examples of monostatic and bistatic RCS reduction show that the antenna-mode RCS can be reduced more than 14dB by this method.

关 键 词：阵列天线 天线模式项散射 雷达散射截面减缩 延时线 

分 类 号：O441.4[理学—电磁学]