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Two-Cascade Shielded Modal Filter for Differential and Common mode Operations
Authors
	Kosteletskii V.P.
	Zabolotsky A.M.
	Lakoza A.M.
Date of publication
	2021
DOI
	10.31114/2078-7707-2021-4-127-133
Abstract
	This paper presents the results of the study of time and frequency characteristics of the shielded modal filter (MF) employed for protecting electronic equipment against ultrashort pulses in differential and common modes. In particular, the paper considers how cascading the structure of the MF affects the pulse amplitudes at its output. The matrices of electrostatic and electromagnetic induction coefficients are presented, as well as the characteristic impedance and the vector of the per-unit length delays. A test excitation used had an amplitude of 250 mV and a duration of 300 ps at the 0.5 level. During the simulation of a one-cascade shielded MF, the pulse amplitudes at the MF output were 82 mV in the differential mode and 74 mV in the common mode, which corresponds to the insertion losses of 9.7 dB and 10.6 dB, respectively. The cutoff frequency was 190 MHz in the differential mode and 181 MHz in the common mode. When simulating a two-cascade shielded MF, the pulse amplitudes at the MF output were 31 mV in the differential mode and 23 mV in the common mode, which corresponds to the insertion losses of 18.1 dB and 20.7 dB, respectively. The cutoff frequency was 130 MHz in the differential mode and 121 MHz in the common mode. In the experimental study of a two-cascade shielded MF, the pulse amplitudes at the MF output were 32 mV in the differential mode and 16 mV in the common mode, which corresponds to the insertion losses of 17.8 dB and 23.9 dB, respectively. The cut-off frequency was 98 MHz in differential mode and 127 MHz in common mode.
Keywords
	electromagnetic compatibility, ultrashort pulse, common mode, differential mode, modal filter, conducted interference.
Library reference
	Kosteletskii V.P., Zabolotsky A.M., Lakoza A.M. Two-Cascade Shielded Modal Filter for Differential and Common mode Operations // Problems of Perspective Micro- and Nanoelectronic Systems Development - 2021. Issue 4. P. 127-133. doi:10.31114/2078-7707-2021-4-127-133
URL of paper
	http://www.mes-conference.ru/data/year2021/pdf/D043.pdf