高隔离度双极化SIC微带天线设计

收稿日期:2014-02-20 网络出版时间:2014-07-10基金项目:国家自然科学基金资助项目(61271100,61471389);陕西省自然科学基础研究计划资助项目(2012JM8003)

;陕西省自然科学基础研究重点资助项目(2010JZ010);空军工程大学优秀博士论文辅助金资助项目(KGD080914002)作者简介:颜佳冰(1991-),男,空军工程大学硕士研究生,E -mail :ls j 051@https://www.360docs.net/doc/e44183549.html,.通讯作者:高 军(1962-),男,教授,E -mail :gjgj 9694@https://www.360docs.net/doc/e44183549.html,.网络出版地址:htt p ://https://www.360docs.net/doc/e44183549.html, /kcms /doi /10.3969/j .issn.1001-2400.2015.02.030.html doi:10.3969/j .

issn.1001-2400.2015.02.030高隔离度双极化SIC 微带天线设计

颜佳冰,李思佳,曹祥玉,高 军,

张 昭,张呈辉

(空军工程大学信息与导航学院,陕西西安 710077)

摘要:为了提高双极化天线的隔离度,在缝隙耦合微带天线的基础上,提出了一种增强双线极化天线隔离

度的新方法.该方法借鉴基片集成波导技术的思想,将基片集成金属过孔嵌入到缝隙耦合双线极化微带天

线当中,在馈电层实现了双端口馈电的区域独立,提高了天线的隔离度;同时对整个天线通过基片集成金

属过孔的嵌入,增强了天线的容性特征,减小了天线等效阻抗的虚部,极大地改善了双极化天线的匹配效

果.通过Ku 频段的双线极化天线设计实例,验证了这种方法的有效性.仿真结果表明,嵌入基片集成金属

过孔的双极化天线隔离度比传统天线的隔离度提高了56%以上,对于-20dB 的反射系数标准,天线的带

宽拓展了110%以上.关键词:基片集成金属过孔;双极化天线;隔离度;缝隙耦合天线;阻抗匹配

中图分类号:TN82 文献标识码:A 文章编号:1001-2400(2015)02-0180-06

Desi g n of the dual p olarized SIC microstri p antenna with hi g h isolation

YAN J iabin g ,LI Si j ia,CAO Xian g y u,GAO J un,

Z HANG Zhao,Z HANG Chen g hui

(Information and Navi g ation Colle g e,Air Force En g ineerin g Univ.,Xi an 710077,China )

Abstract: A novel method for enhancin g the isolation of dual -linear p olarized antenna is p ro p osed based on the a p erture cou p led structure.The substrate inte g rated wave g uide (SIW )technolo gy is introduced and the

substrate inte g rated cavities (SICs )are used in the a p erture cou p led and dual -linear p olarized antenna to enhance the isolation between two p orts in the feedin g la y er.The ca p acitive characteristic for the p ro p osed antenna is im p roved and the ima g inar y p art of the e q uivalent im p edance for the p ro p osed antenna is

decreased b y embeddin g the SICs in the four sides of the dual -linear p olarized antenna,so that the im p edance bandwidth of the p ro p osed antenna is im p roved.A Ku band dual -linear p olarization microstri p antenna is desi g ned b y this method to p rove the effectiveness of the method and simulated results indicate that the isolation is enhanced above 56%and the im p edance bandwidth is increased above 110%of the reflection coefficient smaller than -20dB.Ex p eriments are carried out to verif y the simulations.

Ke y Words: substrate inte g rated cavit y ;dual -

p olarized antenna;isolation;a p erture cou p led antenna;im p edance marchin g 无线信息的传输体制和雷达探测的应用需求使圆极化二双极化天线得到了广泛的研究和应用[1].

由于缝隙耦合微带双极化天线具有低剖面二高增益和易共形的优点,故受到了广泛的应用和研究[2].缝隙耦合微带2015年4月

第42卷 第2期 西安电子科技大学学报(自然科学版)JOURNAL OF XIDIAN UNIVERSITY A p r.2015Vol.42 No.2