一种加载可变电感的电小单极子天线设计  

Design of Electrically Small Monopole Antenna with Variable Inductance

作　　者：魏聪 陈星[1] WEI Cong;CHEN Xing(College of Electronics and Information Engineering,Sichuan Univerity,Chengdu 610065,China)

机构地区：[1]四川大学电子信息学院,四川成都610065

出　　处：《无线电通信技术》2023年第1期187-192,共6页Radio Communications Technology

基　　金：国家自然科学基金(U19A2054)。

摘　　要：设计了一种加载可变电感的平面折叠单极子天线,首先针对方形单极子天线尺寸过大的缺点,对方形单极子使用开槽、引入弯曲折叠线来延长天线表面电流流动路径,成功降低了天线的工作频点,使其成为电小天线。然后针对天线在低频处输入阻抗虚部呈现容性的特点,对天线进行了感性加载来补偿低频处的容抗,使得天线的谐振点随引入的电感值不同而在一个较宽的频率范围内变化,实现宽频带工作。加载电感后,天线最低谐振频率为267 MHz,最小电尺寸为0.089λ,λ为工作频点对应波长。通过加载可变电感实现了106 MHz的变频带宽(|S11|≤-10 dB),电感加载为电小天线的宽频带工作提供了一种设计思路。A planar folded monopole antenna loaded with a variable inductance is designed.First,in view of the oversizing square monopole antenna,a square monopole is adopted using a slot and introducing a curved folded line to extend current flow path on the antenna surface,which successfully reduces the working frequency of the antenna and makes it an electrically small antenna.Then,in view of the capacitive feature of the imaginary part of the input impedance of the antenna at the low frequency,the antenna is inducti-vely loaded to compensate the capacitive reactance at the low frequency,so that the resonant point of the antenna changes in a wide frequency range with different inductance values introduced,and the broadband operation is realized.After the inductance is loaded,the minimum resonant frequency of the antenna is 267 MHz,and the electrical size is 0.089λ(λis the wavelength corresponding to the operating frequency point).106 MHz frequency conversion bandwidth(|S11|≤-10 dB)is achieved by loading variable inductors,which provides a design idea for the broadband operation of electrically small antennas.

关 键 词：单极子 电感加载 变频 电小天线 

分 类 号：TN821[电子电信—信息与通信工程]