Systematic Approach to Optimization for Protection Against Intentional Ultrashort Pulses Based on Multiconductor Modal Filters

Abstract

The problem of protecting radio electronic equipment from ultrashort pulses is of utmost importance nowadays since conductive interference poses the biggest danger to its proper functioning. The article considers the issue of protecting equipment by means of modal filters (MFs) and analyzes the structures of multiconductor microstrip MFs. We present the results of a complex study of the possibility to conduct the optimization (both separate and simultaneous) of a multiconductor MF by different criteria and the formulation of the basic (electrical) optimization criteria for MF. We have formulated the amplitude and time criteria for optimizing an MF (with any number of conductors) in an analytical form and obtained a general multicriteria objective function for optimizing an MF by different criteria. As a result, we have formed a hybrid model consisting of heuristic search and GA. The results demonstrated the topicality of further research in this field.This study has been carried out in memory of the authors' teacher Ivan Nikolaevich Pustynsky who died on 29.12.2017

Solving the Complexity Problem in the Electronics Production Process by Reducing the Sensitivity of Transmission Line Characteristics to Their Parameter Variations

“…In this paper, for quick estimations, we have used calculations of transmission line parameters only. However, for more comprehensive analysis, you can calculate the frequency or time response and use optimization by genetic algorithms similarly to [37].…”

Using Reflection Symmetry to Improve the Protection of Radio-Electronic Equipment from Ultrashort Pulses

“…However, to improve the characteristics of the reflection symmetric MF, it is advisable to use optimization, for example, parametric optimization by heuristic search. To begin with, we specify the main optimization criteria: by amplitude and by time [34]. Meanwhile, in order to obtain higher characteristics of the reflection symmetric MF, the following criteria are relevant:…”

“…Thus, it is advisable to perform multicriteria optimization to further improve the characteristics of the reflection symmetric MF simultaneously using three criteria: minimizing the maximum voltage (max(U)) at the MF output, equalizing the time intervals between decomposition pulses (∆t i ), and ensuring matching with the path of 50 Ω. To achieve matching, we used the condition that the signal amplitude at the beginning of the line (V 2 ) should be equal to half the EMF of the signal source (V 1 ) ( Figure 7a) [34]. The optimization by three criteria was performed for four reflection symmetric MF structures ( Figure 6) by heuristic search in the range of parameters.…”

“…To optimize the reflection symmetric MF, it is sufficient to use a heuristic search, whereas when optimizing the microstrip MF, it may be necessary to use other approaches (for example, genetic algorithms) [34].…”