Design Of Electromagnetic Protection Components Based On Filtering And Discharge Networks

Network transmission,as the main means of information transmission in modern society,is highly susceptible to the influence of electromagnetic pulses.Whether it is wired signal transmission using cables as the medium or wireless signal transmission using free space as the medium,once affected by electromagnetic pulse interference,it can result in normal signal transmission disruption,causing temporary malfunction of back-end devices,or even permanent damage to the system.Therefore,electromagnetic protection for network signals is an important issue in today’s era.In this thesis,by analyzing both cable and radio frequency transmission pathways for network signals,four electromagnetic protection components were designed,namely,100 Mbps Ethernet electromagnetic protection component,1000 Mbps Ethernet electromagnetic protection component,100 Mbps radio frequency electromagnetic protection component,and 1000 Mbps radio frequency electromagnetic protection component.First,the thesis designed two Ethernet electromagnetic protection components: the100 Mbps Ethernet electromagnetic protection component and the 1000 Mbps Ethernet electromagnetic protection component.The 100 Mbps Ethernet electromagnetic protection component,using a cascaded design of filtering and discharge networks,can clamp pulse voltages with peak values of 5 k V and rise times within 5 ns to a safe level of 30 V or lower.The 1000 Mbps Ethernet electromagnetic protection component,which only uses the discharge network for protection,can clamp pulse voltages with peak values of 5 k V and rise times within 5 ns to a safe level of 60 V or lower.Comparing the protective capabilities of the two components further highlights the importance of filtering networks in electromagnetic protection.Second,the thesis designed two radio frequency electromagnetic protection components: the 100 Mbps radio frequency electromagnetic protection component and the 1000 Mbps radio frequency electromagnetic protection component.The 100 Mbps radio frequency electromagnetic protection component,unlike the Ethernet filtering networks directly cascaded with each other,embeds the discharge network into the filtering network.This approach not only effectively reduces the volume of the protection component but also enhances its response sensitivity and protection performance.The design concept of the 1000 Mbps radio frequency electromagnetic protection component is the same as that of the 100 Mbps radio frequency electromagnetic protection component,but it operates in the 2.4 GHz and 5 GHz frequency bands.Therefore,the filtering and discharge networks are designed in the same manner for both frequency bands.Through simulation,the test results of the 100 Mbps radio frequency electromagnetic protection component are verified,and it also has advantages such as non-interference between the two working frequency bands,and protection performance less affected by the manufacturing process of the PIN diode itself.