甚低频声波介导纵向谐振式磁电天线通信研究

Very Low Frequency Acoustically Mediated Longitudinal ResonantMagnetoelectric Antenna Communication Study

基于声波谐振的磁电天线(Magnetic Electric Antenna, MEA),利用复合材料间的高耦合效应,在共振频率下,产生高效的磁场辐射能力,实现低频电磁波发射。提出声波介导对称式纵向谐振式甚低频磁电天线,建立ME天线等效电路模型,依据牛顿第二定律和安培定律引入参数压电体积分数,建立包含工作损耗的动力学模型和辐射场模型,并设计低频通信试验系统。试验结果表明,压电体积分数n=0.66时,ME天线辐射磁感应强度增大1.7倍,通信距离提升120%。在同等尺寸下,比电小天线辐射效率提升3个数量级,通过5 bps的FSK调制,实现低频下的可靠通信,验证了ME天线在低频电磁通信的优越性。

Based on acoustic resonance,a magnetic electric antenna(ME Antenna)utilizes the high coupling effect between composite materials to generate efficient magnetic field radiation capability at resonant frequen⁃cies for low frequency electromagnetic wave emission.The acoustically mediated symmetrical longitudinal reso⁃nant VLF magnetoelectric antenna is proposed,and the equivalent circuit model of the ME antenna is estab⁃lished.The parametric piezoelectric volume fraction is introduced according to Newton's second law and Am⁃pere's law,the kinetic model containing the operating loss and the radiation field model is established,and the low frequency communication test system is designed.The experiment results show that the ME antenna radi⁃ates 1.7 times more magnetic induction strength and 120%more communication distance when the piezoelectric volume fraction n=0.66,which improves the radiation efficiency by three orders of magnitude,compared with the electric small antenna at the same size,and reliable communication is achieved at low frequencies by FSK modulation at 5 bps.The superiority of the ME antenna in low frequency electromagnetic communication is verified.