磁电机械天线的阻抗特性分析  

Impedance characteristics of magnetoelectric antennas

作　　者：宋凯欣 闵书刚 高俊奇 张双捷 毛智能 沈莹 储昭强 Song Kai-Xin;Min Shu-Gang;Gao Jun-Qi;Zhang Shuang-Jie;Mao Zhi-Neng;Shen Ying;Chu Zhao-Qiang(Key Laboratory of Underwater Acoustic Technology,Harbin Engineering University,Harbin 150001,China;Key Laboratory of Marine Information Acquisition and Security,Ministry of Industry and Information Technology(Harbin Engineering University),Harbin 150001,China;Underwater Acoustics College of Engineering,Harbin Engineering University,Harbin 150001,China;Innovation and Development Center,Harbin Engineering University,Qingdao 266071,China)

机构地区：[1]哈尔滨工程大学,水声技术重点实验室,哈尔滨150001 [2]海洋信息获取与安全工信部重点实验室(哈尔滨工程大学),哈尔滨150001 [3]哈尔滨工程大学水声工程学院,哈尔滨150001 [4]青岛哈尔滨工程大学创新发展中心,青岛266071

出　　处：《物理学报》2022年第24期367-375,共9页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:52102127);山东省自然科学基金(批准号:ZR2021QF021);国防重点实验室基金(批准号:KY10500220007)资助的课题。

摘　　要：机械天线被认为是目前能够实现甚低频和超低频天线小型化的新方案.本文针对1-1型和2-1型磁电机械天线的阻抗特性进行系统研究.基于天线振子的阻抗曲线和修正的Butterworth-van Dyke模型,分别获得阻抗最小频率f_(m)、串联谐振频率f_(s)以及谐振频率f_(r).在此基础上,本文通过实验分析了驱动电压、偏置磁场和机械品质因数(Q值)对磁电机械天线阻抗特性的影响规律,并结合磁电机械天线的实际工作频率f_(d),获得了1-1型和2-1型磁电机械天线的电阻和电抗分量.实验结果表明:无论是1-1型还是2-1型磁电机械天线,其电抗分量均小于100Ω,基本可以看成一个纯阻性振子.但是高Q值的磁电机械天线非线性效应强,且自身阻抗相对较小,难以支持高驱动电压的加载,辐射能力有限.本文对磁电机械天线的设计优化,特别是在认识其阻抗特性的基础上进行Q值选择,为下一代高辐射性能天线振子的设计提供了重要数据参考.Mechanical antenna,a novel scheme for realizing very low frequency(VLF)and portable transmitters,has been investigated recently.In this work,the impedance characteristics of 1-1 type of and 2-1 type of magnetoelectric(ME)mechanical antennas are systematically studied and compared with each other.Based on the measured frequency-impedance curves and the corresponding modified Butterworth-van Dyke(MBVD)model,three characteristic frequency points,i.e.the minimum impedance frequency f_(m),the series resonance frequency f_(s),and the resonance frequency f_(r) are obtained and discussed.On this basis,the influence of driving voltage,bias magnetic field,and the quality factor(Q value)on ME antenna impedance characteristics are experimentally explored.Finally,the reactance components of both 1-1 type of and 2-1 type of ME antenna are collected by referring to the actual working frequency f_(d).Experimental results prove that the resonant ME antennas are basically pure resistive vibrators,while an ME antenna with high Q value normally fails to support high driving field because of the low resistance(<100Ω)and the strong nonlinearity.Thus,the field radiation capability in 2-1 type of ME antenna is higher than that in 1-1 typed one.This work provides the ideas for choosing Q value and further optimizing a magnetoelectric antenna based on the understanding of its impedance characteristics.

关 键 词：机械天线 磁电耦合 阻抗特性 机械品质因数 修正的Butterworth-van Dyke模型 

分 类 号：TN820[电子电信—信息与通信工程]