摘要
负μ传输线是一种通过串联电容加载来获得等效负磁导率的人工电磁材料,利用其零传播常数的性质,可以设计具有无限大波长且谐振频率与尺寸无关的谐振器,从而实现天线的小型化和宽带化.本文以基于分段线结构的负μ传输线为例,分别设计了具有宽带特性的电偶极子和环天线.测试结果表明长度为107 mm (1. 03λ_0@2. 9 GHz)的电偶极子可获得的阻抗带宽约为1. 4 GHz(2. 2～3. 6 GHz,48%),并且该天线在工作带宽内具有稳定的E面方向图.直径为52 mm(0. 5λ_0@2. 9 GHz)的环天线可获得的阻抗带宽约为1 GHz (2. 4～3. 4GHz,34%),并且环上具有均匀的电流分布,从而具有磁偶极子的辐射特性.测试和仿真结果吻合较好.
Mu-negative(MNG)transmission linesare artificial structureswhereseries-loaded capacitors are used to effectively obtain negative permeability.Because they have apropagation constant of zero,MNG transmission linescan be used to design resonators with an infinite wavelength and a resonance frequency independent of size to realize compact antenna designs with wide bandwidths.In this study,a wide-bandwidth dipole antenna and a loop antenna with a segmented line structure based on an MNG transmission line are proposed and fabricated.The proposed dipole antenna can operate ata wide impedance bandwidth of 1.4 GHz(2.2-3.6 GHz,48%)with a length of 107 mm(1.03λ0@2.9 GHz)and exhibits stable E-plane radiation patterns.The proposed loop antenna can operate ata wide bandwidth of 1GHz(2.4-3.4 GHz,34%)with a diameter of 52 mm(0.5λ0@2.9 GHz).Moreover,the proposed loop antenna has a uniform current distribution;thus,radiation characteristics equivalent to those of a magnetic dipole can be obtained.The experimentaland simulation results demonstrate good agreement.
作者
王轶珏
贾兴宁
朴大志
WANG Yijue;JIA Xingning;PIAO Dazhi(Communication University of China,College of Information and Communication Engineering,Beijing 100024)
出处
《南京信息工程大学学报（自然科学版）》
CAS
2019年第1期47-52,共6页
Journal of Nanjing University of Information Science & Technology（Natural Science Edition）
基金
国家自然科学基金(61771435)
关键词
负μ传输线
电偶极子
环天线
宽频带
mu-negative transmission line
electric dipole
loop antenna
wide bandwidth
