Abstract
The paper considers the protection of critical radio-electronic equipment (REE) from ultrashort pulses (USP) by means of modal filters (MFs). A new approach to improve modal filtration by using reflection symmetry is analyzed. The results of a sophisticated research into protective devices based on reflection symmetric MFs are presented: improving the characteristics of four MFs through optimization both by one and simultaneously by several criteria; calculating the per-unit-length time delays matrix of a reflection symmetric MF using the obtained analytical expressions; calculating the time and frequency responses of an MF with and without losses in conductors and dielectric; developing the laboratory evaluation board; analyzing the effect of moisture protection on the characteristics; analyzing the features of reflection symmetry structures; comparing microstrip and reflection symmetric four-conductor MFs. The obtained results allow us to argue that the reflection symmetric MF protects REE from a USP due to its decomposition into a sequence of pulses with pairwise equalized voltage amplitudes and close time intervals between decomposition pulses with an attenuation coefficient of four times with a controlled bandwidth of a useful signal. This research helps take advantage of the possibilities of using the symmetry to improve modal filtering and opens the ways to create a large number of new MF designs, applying only the principles of the symmetry described in the work.
Highlights
Radio-electronic equipment (REE) has been introduced in almost all industries, including military, nuclear, space, medical and telecommunications
Matrix in the range of parameters of the two-conductor strip structure. These results are compared with the results of measurements and simulations performed by the Green’s function method (GFM), method of moments (MoM), and variational method (VM) published in [28] (Table 2)
The obtained analytical expressions can be used to calculate the per-unit-length time delays matrices, and as part of more complex analytical expressions to calculate the time response, which can significantly speed up the optimization process
Summary
Radio-electronic equipment (REE) has been introduced in almost all industries, including military, nuclear, space, medical and telecommunications. Such a tendency leads to an aggravation of the electromagnetic compatibility (EMC) problem due to vulnerability of equipment, especially to intentional electromagnetic interferences (IEMI). The problem of IEMI is regularly discussed at international conferences, for example at AMEREM, EUROEM and ASIAEM. At the ASIAEM 2015 conference, there was a conference panel called “IEMI Threats, Effects and Protection” and even two special panel discussion groups “Design of Protective Devices and Test Methods”, and “Evaluation of HEMP/IEMI Impacts on Critical Infrastructure”. The first open discussion of this problem took place at the plenary session of the AMEREM conference in 1996 [1].
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