【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。更多还原

【Abstract】 The design of a tri-band dual-polarized(TBDP) shared-aperture microstrip 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 patterns agree well with the simulated results at each band.The |S11|≤10dB bandwidths of 13.4%,14.8% and 16.8% are measured at L,S and X bands,respectively,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 further extended to realize shared-aperture dual-polarized arrays with more than three bands.更多还原