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The protection of the onboard equipment of the spacecraft from an ultrashort pulse (USP) based on modal filtering is proposed. The paper presents the results of the development of a modal filter (MF) prototype with a broad-side coupling. When choosing a structure, the maximum bus current, insulation breakdown voltage, wave impedance of line and the duration of the interfering USP are taken into account. To substantiate the choice of structure, quasi-static and electrodynamic simulations are performed. The simulation showed that the MF with resistance of 50 Ω at both ends of the passive conductor effectively weakens the 0.45-ns USP by 4 and with non-resistance connection on the passive conductor by 7. The MF prototype without resistors is made. Frequency dependence of |S 21| is measured. An experiment showed that the MF weakens the USP by 5.61. The bandwidth of the MF is 60 MHz.

The paper considers the protection of radio-electronic equipment against common and differential mode interference by means of a filter based on lumped elements. The authors have developed a schematic diagram of the filter to be used in power supply circuits of a spacecraft, and present and compare the results of circuit simulation and experiment. The results are useful for further development of noise protection devices for the spacecraft power bus.

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