摘要
磁天线尺寸小,灵敏度高,不易受电力线干扰和沉积静电的影响,尤其在水中等特殊环境中,磁天线的优势更加明显。磁天线结构简单,基于法拉第电磁感应定律的工作原理,磁力线通过天线绕环时,会在环上感应出电压,天线的谐振频率主要由环路的电感和电容决定。磁芯磁性材料的磁导率、长度及粗细,绕制线圈的线型、匝数和绕制方式等是决定磁天线接收特性及性能的主要因素。同时,设计中必须保证磁天线的阻抗匹配,才能使得天线感应到的信号电压最大功率的被输出。根据磁天线的基本原理,研究了磁天线的结构特性、关键参数选取和基本的设计思路。
The size of the magnetic antenna is small and its sensitivity is high which does not needgrounding. Its superiority is more obvious especially in some special environment such as water. Itsoperational principle is simple. There will be a response current when the magnetic line of flux passesthroughthe hoop. Its resonance oscillation frequency is decided by the inductance and the capacity in thecircuit. The coiling way and circle are the critical factors to its receiving feature except the permeability,the length and the thickness of magnetic material. The design must be sure impedance matching in orderto keep the signal out in the most power. According to the basic principle of the magnetic antenna, thisarticle discusses on the structure characteristics, pivotal parameter and fundamental devising thinking.
出处
《信息技术》
2014年第8期112-114,共3页
Information Technology
关键词
磁天线
磁芯
阻抗匹配
magnetic antenna
magnetic core
impedance matching
