共用口径S／X双波段双极化微带天线阵  

Shared-aperture S/X dual-band dual-polarized microstrip antenna array

作　　者：钟顺时[1] 瞿新安[1] 张玉梅[2] 梁仙灵[1] 

机构地区：[1]上海大学通信与信息工程学院,上海200072 [2]华东电子工程研究所,安徽合肥230031

出　　处：《电波科学学报》2008年第2期305-309,共5页Chinese Journal of Radio Science

基　　金：高等学校博士学科点专项科研基金项目(20050280016);国家高科技发展计划专题项目(2007AA12Z125课题)

摘　　要：介绍了一种新的应用于合成口径雷达的双波段双极化(DBDP)共用口径微带天线阵,工作于S波段和X波段。为了实现S/X波段的奇数频率比(1∶3),在S波段采用正交的微带振子天线,在X波段采用双极化方形微带贴片天线;为获得较宽的带宽,该二天线均采用双层结构。在馈电方式上,S波段采用邻近耦合馈电,X波段采用同轴探针和口径耦合馈电。对天线进行了仿真、设计、加工和测试,仿真结果与实测结果吻合良好。实测的S波段和X波段阻抗带宽分别达8.9%和17%,实测的极化隔离度在两个波段内均优于20dB,实测的S波段和X波段交叉极化电平分别在-26dB和-31dB以下。本研究验证了这种具有奇数频率比的共用口径DBDP微带天线阵的可行性,对这种DBDP微带天线阵在SAR系统中的应用具有重要的参考意义。A novel shared-aperture dual-band dual-polarized （DBDP） microstrip antenna array for synthetic aperture radar （SAR） operating at S-and X-bands is intro- duced. To meet the odd frequency ratio （1：3） of S/X bands, the orthogonal mi- crostrip dipoles and the dual-polarized square patches are employed at S-band and X- band, respectively, while the two-layers configuration is used for both bands to achieve wider bandwidths. The proximately coupled feeds and the probe-fed and aperture-coupled feeds are applied for S-band and X-band, respectively. The antenna array was simulated and designed and two same test arrays are fabricated. The simulated results are good agreement with the measured ones. The measured impedance bandwidth （VSWR ≤ 2） of the test array reaches 8.9% and 17% for S-and X- bands, respectively, and the measured isolation between polarizations for both bands is better than 20dB. The measured cross-polarization levels are ≤-26dB for the S-band and ≤-31dB for the X-band. This work verifies the practicability of this type of dual--band dual--polarized microstrip antenna arrays with the odd frequency ratio, which will be instructive for the future SAR applications of this type of DBDP microstrip antenna arrays.

关 键 词：微带天线阵 双波段 双极化 共用口径 宽频带 合成口径雷达 

分 类 号：TN822[电子电信—信息与通信工程]