宽带双波段双极化共口径SAR天线设计  

Design of Broadband Dual-Band Dual-Polarized Share-Aperture SAR Antenna

作　　者：孙竹[1] 钟顺时[1] 孔令兵[1] 高初 汪伟 金谋平 

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

出　　处：《电子学报》2012年第3期542-547,共6页Acta Electronica Sinica

基　　金：国家自然科学基金项目(No.60871030);国家高技术发展研究(863)计划课题(No.2007AA12Z125)

摘　　要：介绍了一种应用于合成孔径雷达(SAR)的X和S双波段双极化(DBDP)共用口径宽带天线阵的设计与测试结果.针对以往同类天线低频百分比带宽明显较高频窄的缺点,设计中采用了三谐振技术来展宽低频波段的带宽;并综合采用多种方法以改善两个波段的极化隔离度.经实测,样阵X和S波段的带宽(VSWR≤2)分别达到13.1%和11%;带内阵列隔离度优于37dB,单元隔离度优于28dB;阵列方向图与理论均吻合很好,主瓣内交叉极化优于27dB;X波段扫描能力达±27°.A broadband dual-band dual-polarized（DBDP） shared-aperture array operating at X-and S-bands for the synthetic aperture radar（SAR） application is presented.Tri-resonance is introduced in the lower frequency element to broaden its intrinsic narrower bandwidth.Furthermore,several methods are employed to enhance the polarization isolation in both bands.VSWR≤2 bandwidths of 13.1% and 11% are measured in X-and S-band,respectively,where in-band array isolation and element isolation are better than 37dB and 28dB.The measured radiation patterns match well with the theoretical ones while the cross-polarization level is suppressed under-27dB within mainlobe;the X-band scan ability of ±27° is also confirmed by the measurement.

关 键 词：宽带 高隔离度 双波段 双极化 共用口径 微带天线阵 非整数频率比 合成孔径雷达天线 

分 类 号：TN821.1[电子电信—信息与通信工程]