射频识别系统电磁辐射干扰特征快速分析与抑制

Analysis and Suppression on Radiated EMI Noise for Radio Frequency Identification Systems

针对射频识别系统产生的辐射干扰噪声,提出了基于近场测量结合波阻抗分析的辐射机理快速分析方法与基于全电容高频电磁干扰(electromagnetic interference,EMI)滤波器的辐射噪声抑制方法,可避免苛刻复杂的电波暗室噪声检测和电磁屏蔽噪声抑制方法,具有简便、快速、经济等优点。标准测试表明:采用文中方法可有效抑制辐射干扰噪声,噪声抑制效果可达24 dBμV/m,满足GB 9254 Class A标准,从而验证了方法的有效性。

In order to solve radiated electromagnetic interference generated by the radio frequency identification system, the convenient approach was proposed to diagnose the radiated EMI mechanism based on near-field measurement and suppress radiated EMI noise by utilizing radio frequency EMI filters. It can avoid the complicated EMI noise analysis and suppression methods such as 3-m anechoic chamber and electromagnetic shielding. The standard results show that RFID system can pass the GB 9254 Class A and the noise decrease 24 dB^tV/m by employing the suggested approaches, and thus good realization.