共口径三波段双极化合成孔径雷达天线阵的设计

摘要

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.%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。