Minimizing the dimensions of two-segment protective structures based on modal filtering by managing the decomposition pulse sequence

Nosov A. V.¹, Gazizov T. R.¹

¹Tomsk State University of Control Systems and Radioelectronics.

DOI 10.24412/2410-9916-2026-2-050-068

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Abstract

Problem statement. As packaging density and speed of modern radio-electronic equipment (REE) are constantly increasing, tra-ditional means of protecting REE against ultrashort pulses (USPs) are becoming ineffective due to insufficient response time, weight and size limitations, as well as low radiation resistance. Multi-turn meander lines (MLs) and modal filters (MFs) may solve this problem; however, high-permittivity coatings, such as ra-dio-absorbing materials (RAMs), for their miniaturization can lead to the inversion of the mode propagation velocity. This makes classical modal decomposition conditions inapplicable and requires adjusting the math-ematical framework more accurate design of such devices. Purpose. The aim of this work is to minimize the dimensions of structures consisting of two series-connected segments based on modal filtering by applying decomposition conditions that are invariant to the mode pulse arrival order and by optimizing this order. Methods. The main approach involves analysis, structural-parametric optimization via heuristic search, and a computational experiment in the TUSUR.EMC system. Novelty. For the first time, analytical expressions for invariant conditions of USP decomposition were obtained for two-wire structures consisting of two series-connected segments. These expressions are based on ordering the modes according to the extrema of per-unit-length delays, which ensures calculation accuracy when their pulse arrival order is inverted by changes in the dielectric medium. The alternative decomposition sequences were proved to provide a multiple reduc-tion in the turn length while maintaining the USP attenuation. Results. It was shown that for the two-turn meander microstrip line, the optimization of the pulse arrival order in combination with RAM reduced the total physical length by a factor of 5.1 while maintaining a 4-fold USP attenuation. In the ML with broad-side coupling, the USP was decomposed into 16 main pulses, providing a 6.61-fold attenuation over a length of 334.6 mm. The hybrid structures (a series connection of an MF and an ML) demonstrated the highest protec-tive potential, providing USP attenuation up to 6.65 times. Practical relevance. The proposed solutions and mathematical apparatus enable the design of compact protection devices based on modal filtering for critical REE.

Key words

ultrashort pulse, modal filtering, meander line, broad-side coupling, hybrid protection, invariant decomposition conditions, miniaturization.

Reference for citation

Nosov A. V., Gazizov T. R. Minimizing the dimensions of two-segment protective structures based on modal filtering by managing the decomposition pulse sequence. Systems of Control, Communication and Security, 2026, no. 2, pp. 50-68. DOI: 10.24412/2410-9916-2026-2-050-068 (in Russian).

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