宽带高抑制性能电磁脉冲防护电路设计与实验

强电磁脉冲易通过天线、孔缝、线缆等多种耦合途径进入电子系统内部,造成敏感电子设备出现短暂故障或永久损毁。安装电磁脉冲防护电路可有效提高电子设备抗强电磁脉冲能力。基于LC选频网络和瞬态电压抑制(TVS)二极管,设计了一种宽带高抑制性能电磁脉冲防护电路,防护电路工作带宽超过2 GHz、插入损耗低于0.6 dB。系统性研究了防护电路对频谱分布在工作带宽内多种电磁脉冲(方波脉冲、宽带高功率微波、窄带高功率微波)的防护能力。结果表明:防护电路对不同类型电磁脉冲电压抑制比大于40 dB、耐受功率超过387 kW、而响应时间仅0.7 ns。该防护电路具有工作频带宽、电磁抑制性能好、响应速度快、耐受功率高等特点,对电子信息系统电磁防护加固具有重要意义。

Design and experiment of wideband electromagnetic pulse protection circuit with effective suppression capability

High-intensity electromagnetic pulse can easily couple into the electronic system through antenna, cavity and cable, causing transient failure or permanent damage of the sensitive electronic equipment. Installing electromagnetic pulse protection circuit can effectively improve the anti-destruction ability of electronic equipment against high-intensity electromagnetic pulse. Herein, based on LC frequency selective network and transient voltage suppressor (TVS) diodes, we develop a wideband electromagnetic pulse protection circuit with outstanding suppression capability. The operation bandwidth of the protection circuit exceeds 2 GHz, while the insertion loss is less than 0.6 dB. Moreover, the suppression capabilities of this protection circuit towards square-wave pulse, wide-band high-power microwave and narrow-band high-power microwave were systematically investigated. The results show that the protection circuit has a suppression ratio of more than 40 dB and power capacity up to 387 kW, while the response time is as low as 0.7 ns. Altogether, the protection circuit has advantages of wide operation bandwidth, excellent suppression performance, fast response time and high power capacity, which are of great importance for the electromagnetic protection reinforcement of electronic information system.