共口径三波段双极化合成孔径雷达天线阵的设计  

Design of shared-aperture tri-band dual-polarized SAR array

作　　者：孙竹[1] 钟顺时[1] 孔令兵[1] 高初[2] 汪伟[2] 金谋平[2] 

机构地区：[1]上海大学通信与信息工程学院,上海200072 [2]中国电子科技集团公司第三十八研究所,安徽合肥230031

出　　处：《电波科学学报》2012年第4期696-702,共7页Chinese Journal of Radio Science

摘　　要：介绍了应用于合成孔径雷达(SAR)的一种共口径三波段双极化(TBDP)天线阵的设计。该TBDP天线阵工作于X、S和L波段,频率比为8∶2.8∶1.它由L/S、L/X双波段双极化(DBDP)子阵和一副L波段双极化(DP)子阵组合而成。天线各波段实测的阻抗带宽和方向图都与仿真结果吻合良好。实测的L、S和X波段|S11|≤10dB带宽分别达到13.4%、14.8%和16.8%,各波段带内阵列隔离度均优于37dB.天线实测方向图表明:各波段的主瓣内交叉极化电平低于-30dB,S和X波段扫描能力均优于±25°.该设计方法可以推广应用于实现更多波段的共用口径天线阵。The design of a tri-band dual-polarized （TBDP） shared-aperture micros- trip array for SAR applications is introduced. This TBDP array operates at X, S and L bands with a frequency ratio of 8 ： 2.8 = 1. It composes of two L/S and L/X dual-band dual-polarized （DBDP） shared-aperture sub-arrays and one L-band dual- polarized （DP） sub-array. Its measured impedance bandwidth and radiation pat- terns agree well with the simulated results at each band. The ｜S11｜≤10dB band- widths of 13.4%, 14.8% and 16.8% are measured at L, S and X bands, respec- tively, and the array isolation of better than 37dB is measured in all bands. The measured radiation patterns show that the cross-polarization level is lower than --30 dB within main lobe regions for all three bands and the scanning capacity is better than ±25° in both S-and X-bands. This array synthesis method may be fur- ther extended to realize shared-aperture dual-polarized arrays with more than three bands.

关 键 词：共用口径 三波段 双极化 微带天线阵 合成孔径雷达(SAR) 

分 类 号：TN82[电子电信—信息与通信工程]