基于电驻极体运动的小型化低频发射天线

Miniaturized low frequency transmitting antenna based on vibratory electret

摘要:

低频电磁波具有较低的传输损耗，但是传统的谐振式天线往往尺寸较大，工程应用的难度很大。运流电流可以产生时变的辐射电磁场，并且工作频率不再受传统谐振天线的尺寸限制，这为小型化的低频发射天线提供了一种有价值的思路。通过理论计算，研究了振动电驻极体的电磁场和等效模型，通过仿真进行验证，并对基于电驻极体机械运动的小型化的低频天线进行了有益的探索。研究表明，振动的电驻极体可实现类似于微小电流元的辐射特性。

Abstract:

Low-frequency Electro-Magnetic(EM) waves have low transmission loss, but the traditional resonant antennas have large size at these frequencies which results in difficulties in engineering application. Convection current can generate time-varying electromagnetic fields, and the operational frequency is independent of the antenna size, which gives a new method to produce low-frequency EM radiation. In this paper, the electromagnetic fields and the equivalent model of the vibratory electret are studied through theoretical calculation and simulations. Some sound explorations are conducted to realize low frequency miniature antenna based on the vibratory electret. The research results show that the vibratory electret shares the same electromagnetic characteristics with the current element.