A Study On Information Leakage Prevention Technology Of Transmission Line Based On Microstrip Filter

With the rapid development of electronic information technology,the information leakage of electronic information equipment has brought a certain negative impact on the development of individuals,society and the country.Information leakage protection has become a problem that every country and society in the world must face.The common ways of electromagnetic information leakage are radiation leakage and conduction leakage.According to the phenomenon that transmission line conduction electromagnetic energy or signal will cause electromagnetic information leakage of electronic information equipment,this paper proposes a method to prevent transmission line conduction electromagnetic information leakage based on microstrip filter.Firstly,the design theory and performance parameters of the filter are summarized;Secondly,the mechanism of transmission line information leakage of electronic information equipment is analyzed,and a broadband bandstop filter is designed to prevent electromagnetic information leakage of signal transmission line;In addition,the power line of electronic information equipment is also one of the ways to cause electromagnetic information leakage,so a high insertion loss bandstop filter is designed to prevent electromagnetic information leakage of power transmission line.The experimental results show that the band stop filter has good performance in its stopband,and can effectively prevent the transmission line electromagnetic information leakage.The research conclusion has a certain application prospect in preventing electromagnetic information leakage caused by signal transmission line and power transmission line conduction.The main contents of this paper are as follows:(1)The design process and theoretical analysis method of the filter and the influence of its main performance parameters are introduced;(2)Based on the theory of uniform transmission line,the signal transmission mechanism of signal transmission line and power transmission line is analyzed;(3)A broadband bandstop filter with multiple transmission zeros is designed.The quarter-wavelength microstrip transmission line can be equivalent to the RLC series resonator,and the connection with the feeder of the filter can generate a transmission zero,which can expand the stopband bandwidth,realize the larger stopband of the bandstop filter,and prevent the electromagnetic information leakage caused by the high frequency signal in the transmission line of the low frequency signal over a larger frequency range.Finally,the designed filter can achieve good filtering effect in stopband after testing;(4)A bandstop filter with high current carrying capacity and high insertion loss is designed.According to the structure of traditional bandstop filter with branch loading,the high current load of the filter is realized by using the equivalent structure and parallel coupled microstrip line unequal width technology.By increasing the filter's series,the filter has strong characteristic of signal attenuation,which can prevent the leakage of the conductive electromagnetic information of the high-power transmission line.