电小准各向同性扇形磁偶极子天线  

Electrically Small Quasi-Isotropic Circular Sector Magnetic Dipole Antenna

作　　者：郁剑 吕文俊 YU Jian;LÜWen-jun(Jiangsu Key Laboratory of Wireless Communications,School of Communications and Information Engineering,Nanjing University of Posts and Telecommunications,Nanjing,Jiangsu 210003,China)

机构地区：[1]南京邮电大学通信与信息工程学院江苏省无线通信重点实验室,江苏南京210003

出　　处：《电子学报》2023年第8期2003-2010,共8页Acta Electronica Sinica

基　　金：国家重点研发计划(No.2021YFE0205900);国家自然科学基金面上项目(No.61871233)。

摘　　要：本文提出了一种电小准各向同性扇形磁偶极子的设计方法 .利用微带贴片天线模式综合设计方法,研究由不对称边界条件原型磁偶极子演化成的扇形磁偶极子,发现不对称边界条件情况下可以同时实现电小天线设计和准各向同性辐射特性.通过推导解析设计闭式而确定天线关键参数,设计了圆心角为300°的扇形磁偶极子,分别采用“同轴线+扼流套筒”和“开槽同轴线”两种馈电方式进行激励和测量.结果表明:采用开槽同轴线激励的天线可以获得最均匀的总电场方向图,其最大不圆度低于6.7 dB,辐射效率为91.2%,最终实现的准各向同性扇形磁偶极子的电尺寸为R=0.156λ_(g)×0.056λ_(g)(k_(g)a=0.92),满足电小尺寸条件.A design approach to electrically small quasi-isotropic circular sector magnetic dipole antennas is advanced.Based on the mode synthesis theory of microstrip patch antennas,the circular sector magnetic dipole evolved from the prototype dipole with asymmetric boundary conditions is studied.As is validated,electrically small size and quasiisotropic radiation characteristics can be simultaneously achieved.A set of analytical design closed-form formulas is de⁃rived from the eigen-equation and employed to determine the key parameters of the proposed antenna.As a proof of the de⁃sign approach,the circular sector magnetic dipole antenna with the flared angle of 300°is designed,fabricated and mea⁃sured.The antenna is excited by a sleeve choke coaxial cable and a slotted coaxial cable,respectively.It has been shown that the maximum gain variation of the proposed antenna in the total space is 6.7 dB and the radiation efficiency is 91.2%.The electrical size of the proposed antenna is R=0.156λ_(g)´0.056λ_(g)(k_(g)a=0.92).

关 键 词：电小天线 准各向同性辐射 磁偶极子 开槽同轴线 模式综合 

分 类 号：TN82[电子电信—信息与通信工程]