V.O. Gordeyeva1, A.O. Belousov2

1,2 Tomsk State University of Control Systems and Radioelectronics (Tomsk, Russia)

1 viktoriia.gordeeva@tusur.ru; 2 anton.o.belousov@tusur.ru

Problem statement. The increasing attention to the electromagnetic environment of radioelectronic equipment (REE) in recent years is caused by the emergence of various types of electromagnetic interference. Among them, ultrashort pulses (USP) stand out, which are characterized by a fast rise time and large amplitude. Modal filters (MF) are proposed to protect against them. They decompose the USP into a sequence of pulses of lower amplitude due to the difference in the speed of modes in the line. MF are traditionally implemented in the form of strip structures, but a promising alternative is cable structures. Meanwhile, this requires a separate engineering approach and experimental verification.

The purpose of the work is to develop a prototype MF based on a flat cable and measure its characteristics.

Results. A methodology for prototyping and measuring MFs based on a flat cable is presented, and a prototype MF based on it is developed. The results of the MF measurements are compared with the results of computation-al experiments in the quasi-static and electrodynamic analysis systems. The nature of the dependences of the MF transmission coefficient modulus |S21| in the frequency band up to 2 GHz is similar for all types of analysis with a maximum deviation of 5.2 dB. The MF passband is within 75–310 MHz for measurements and two types of analysis. In the frequency range of 0–10 GHz, the measured modulus of the reflection coefficient |S11| of the MF does not exceed minus 7.4 dB. As a result, the developed MF (225 mm long) is capable of attenuating the influencing interference with a total duration of 200 ps (at the 0.5 level) by 7.03 times according to the measurement results, as well as by 4.3 and 7.45 times according to the simulation results in the quasi-static and electrodynamic analysis systems.

Practical significance. The results of experimental studies expand the toolkit of engineers in-volved in the development and modification of protective devices (both based on flat cables and completely new ones). The developed MF is notable for its potential for practical application in protecting REE from USP in a variety of areas due to its compact size (225 mm) and low weight (up to 75 g), radiation resistance, reliability, and high protective characteristics.

Gordeyeva V.O., Belousov A.O. Experimental study of a modal filter based on a flat cable. Radiotekhnika. 2026. V. 90. № 5.
P. 141−149. DOI: https://doi.org/10.18127/j00338486-202605-17 (In Russian)

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