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Influence of boundary conditions and coupling enhancement on the attenuation of a modal filter with a passive conductor in the reference plane cutout

Ensuring the stable operation of radio-electronic equipment under the influence of electromagnetic interference is relevant due to the fact that radio systems are becoming more complex, the scope of radio - electronic equipment is expanding, and the density of circuit boards is increasing. There is a large selection of protection devices, but they have complex design features that lead to inadequate performance and spurious parameters, making it difficult to protect against a powerful ultrashort pulse. The development of modern protection devices requires simplification and cheapening of their implementation, therefore, their improvement is relevant. The article considers the improvement of protection against an ultrashort pulse using a modal filter with the passive conductor implemented in the reference plane cutout and investigates the influence of boundary conditions of the passive conductor of the modal filter. The simulation showed the possibility to minimize and align the pulse amplitudes and to increase ultrashort pulse attenuation up to 10 times for a given dielectric.