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一概述 EMI(Electro-Magnetic Interfence)一词表示电磁干扰,RFI(Radio FrequencyInterference)一词表示射频干扰。电磁干扰和射频干扰都是有害的随机波动能量。在电发明以前,人类生活在一个自然界的电磁环境中,在这个电磁环境中仅存在如雷电等天电干扰和太阳噪波及星际噪波的干扰。人类发明了电并学会应用电和电子技术以后,电磁环境发生了巨大的变化,增加了许许多多的电磁干扰,例如继电器的开闭、电动机和可控硅的开闭、日光灯的开闭和闪动、静电放电、接地电平的变动、电车的运行以及无线电收发讯机等等。在近代电子技术领域中,通信、测量、医学和计算技术等方面,高频技术的应用得到很大发展,由于频谱使用密集,频率上限提高,从而使人为
An overview EMI (Electro-Magnetic Interfence) refers to the electromagnetic interference, RFI (Radio Frequency Interference) refers to radio frequency interference. Both electromagnetic interference and radio frequency interference are harmful stochastic fluctuations. Prior to the invention of electricity, human beings lived in a natural electromagnetic environment where only electromagnetic interference such as lightning and interference from solar and interstellar noise existed. Humans invented electricity and learn to use electrical and electronic technology, the electromagnetic environment has undergone tremendous changes, an increase of many electromagnetic interference, such as the relay opening and closing, motor and thyristor opening and closing, fluorescent lamp opening and closing and Flashing, electrostatic discharge, changes in ground level, tram operation and radio transceiver and so on. In the field of modern electronic technology, the application of high-frequency technology has been greatly developed in terms of communication, measurement, medical science and computing technology. Due to the intensive use of frequency spectrum and the increase of the upper frequency limit, human beings