V.O. Gordeyeva1

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

1 viktoriia.gordeeva@tusur.ru

Problem statement. Modern radio electronic equipment (REE) imposes high requirements on electromagnetic compatibility and resistance to intentional interference. Especially dangerous are ultrashort pulses (USP) penetrating into REE via signal and power supply circuits. To suppress them, modal filters (MF) are used, which decompose the USP into a sequence of pulses of lower amplitude due to differences in mode delays. At the stage of designing the MF, optimization is performed according to various criteria, but the criterion that preserves the quality of the useful signal is currently absent. A universal method for assessing the integrity of the signal is the eye diagram, the disclosure of which is directly related to the presence of distortions, attenuation and interference. Thus, an urgent task is to develop a criterion for optimizing the MF based on the eye diagram analysis, aimed at increasing the degree of its disclosure, as an indicator of the quality of signal transmission.

The purpose of the work is to formulate and test the criteria for optimizing the MF based on the analysis of the eye diagram (eye criteria).

Results. Eye optimization criteria based on maximizing the difference between the 90th and 10th percentiles of the signal amplitude are formulated. The eye height maximization criterion is tested on two MFs: based on a 3-conductor microstrip line (MF 1) and a 2-conductor stripline with a broad-side coupling (MF 2). For MF 1, optimization allowed increasing the difference in voltage percentiles from 469.6 mV to 496.7 mV (an increase in the eye diagram height by 2.8%), and for MF 2, an increase from 125.8 mV to 255.4 mV (an increase by 34%). Acceptable optimization quality is achieved already after 50 calculations using evolutionary strategies.

Practical significance. The use of the formulated eye criterion in the optimization of the MF significantly expands the toolkit of developers and engineers. This allows not only to ensure effective protection of the REE from ultra-wideband pulse effects, but also to minimize the MF impact on the integrity of effective signals. This approach allows to increase the eye diagram opening up to 2 times.

Gordeyeva V.O. Optimization of strip modal filters with signal integrity retention // Radiotekhnika. 2026. V. 90. № 8. P. 5−13.
DOI: https://doi.org/10.18127/j00338486-202608-01

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