For the first time, the paper considers in a unified work the possibility of the appearance of additional pulses in various structures based on modal filtration technology, which is used to improve protection against ultrashort pulses (USP). We analyzed meander lines (ML) with broad-side coupling, structures with modal reservation (MR), reflection symmetric MLs, and modal filters (MF) with a passive conductor in the reference plane cutout and obtained the following results. It was found that the main reason for the additional pulses to appear in these structures is the introduction of asymmetry (of the cross-section, boundary conditions, and excitation). It is theoretically and experimentally established that additional pulses are a new resource for increasing the efficiency of protective devices with modal decomposition, but the highest effectiveness could be achieved through careful optimization.

The possibility of protection against ultrawideband (UWB) pulses, based on the combination of distortions in a meander together and modal decomposition phenomena, is shown on the example of meander microstrip line. It is revealed that UWB pulse at the end of a line can be decomposed into a sequence of pulses of lower amplitude not exceeding 40% of the pulse level at the beginning of the line. Index Terms -UWB pulse, even and odd modes, meander line, modal decomposition.

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The research presents universal conditions which allow the complete splitting of a dangerous pulse (DP) in a meander microstrip line (MMSL) of any number of cascades. The verification of the conditions was performed on the example of an MMSL of two, three, four and five cascades. Attenuation (times) of a DP in the MMSL of three turns was 8.1, of four turns – 19.9 and of five turns – 33.16.

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