Research On New High Power Electromagnetic Protection Components Based On Transient Devices

With the rapid development of modern electronic technology,electronic devices have been widely applied in various fields such as communication,transportation,finance,and healthcare.However,the electromagnetic environment has also changed accordingly,with problems such as electromagnetic interference and radiation becoming increasingly prominent,posing significant impacts and risks to the normal operation of electronic devices and communication systems.Therefore,research on electromagnetic protection has become a crucial task.The study of electromagnetic protection involves multiple aspects,such as electromagnetic compatibility,electromagnetic radiation,electromagnetic interference,and electromagnetic pulses,and requires the implementation of reasonable electromagnetic protection measures to ensure the normal operation of electronic devices and communication systems.The primary objective of the thesis is to enhance the electromagnetic protection performance of RF systems.To achieve this,the study primarily focuses on the research of novel high-power electromagnetic protection technology based on transient devices,in response to the current electromagnetic protection status of the RF front end.The existing RF system protection methods commonly use energy selective surfaces(ESS)or limiters.ESS has the advantage of withstanding strong power and is mostly used in the front end of larger RF systems but cannot be installed in highly integrated electronic devices.Limiters can be compatible with various sizes of devices,but a single-stage limiter cannot simultaneously balance the performance indicators of power tolerance and response speed due to the influence of the I-region thickness.Multi-stage limiters can increase the upper limit of power tolerance to some extent,but they also introduce to the volume and cost issues.At the same time,in large RF systems,the interference path on the power line is often overlooked.To address these problems,thesis highlights the importance of studying the power supply part of the RF system and the antenna part of the RF front end in improving the protection performance.Installing direct current power electromagnetic protection components on the power supply part of large and medium-sized devices can prevent electromagnetic pulses from coupling into the equipment from the power line.Integrating limiters on the antenna of small devices can greatly enhance the limiting performance.The content of this thesis can be summarized as follows: First,the research background and significance of electromagnetic protection are introduced and the current development status of protection technology research at home and abroad is expounded on.Then,with the goal of improving the protection ability of RF electronic devices,the thesis conducts research analysis.The thesis concludes that protecting the power supply part of the RF system and combining the antenna of the RF front end with the limiter circuit are two important ways to improve the protection performance of RF equipment.Next,a DC power electromagnetic protection component is designed by the thesis.Through a rigorous design process and comprehensive performance testing,it is demonstrated that strong electromagnetic pulses are effectively suppressed by the protective component.Finally,a new method is proposed to enhance the electromagnetic protection performance of the RF front end by combining the antenna with the limiter circuit.Thesis conducts theoretical analysis and electromagnetic simulation to study the advantages of this new self-responsive limiting antenna in limiting performance and compares its communication performance in different operating states.Through building an experimental system,the limiting performance,response speed,and power tolerance capacity of the antenna are tested,validating the improvements in its performance in all aspects.