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This paper presents a comparative analysis of three low-pass filter (LPF) structures based on: 1) modal filtering and an electromagnetic absorber (LPF1); 2) a suspended substrate with a double-sided pattern of strip conductors (LPF2); and 3) a two-dimensional microstrip electromagnetic crystal (LPF3). The effectiveness of each filter in suppressing ultrawideband (UWB) and narrowband (NB) electromagnetic interference (EMI) is evaluated. Frequency and time domain characteristics of the filters are obtained using the finite-difference time-domain (FDTD) and finite element (FEM) methods. N-norms and eye diagrams are analyzed to comprehensively assess EMI attenuation and its impact on signal integrity. The results show that LPF1 exhibits a smaller passband compared to LPF2 and LPF3. However, despite significantly smaller dimensions, LPF1 demonstrates the highest attenuation coefficient for both UWB and NB EMI in the time domain. In terms of signal integrity, LPF1 shows superior performance at data rates up to 2 Gbps due to its stable group delay values in the frequency range from 0 to 2.2 GHz.

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Comparative Analysis of the Effectiveness of Intentional Electromagnetic Interference Suppression in Low-Pass Filters

  • 会议论文

  • 发表日期：

    2025年

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  • Ye. Zhechev,
  • A. Zabolotsky

摘要

This paper presents a comparative analysis of three low-pass filter (LPF) structures based on: 1) modal filtering and an electromagnetic absorber (LPF1); 2) a suspended substrate with a double-sided pattern of strip conductors (LPF2); and 3) a two-dimensional microstrip electromagnetic crystal (LPF3). The effectiveness of each filter in suppressing ultrawideband (UWB) and narrowband (NB) electromagnetic interference (EMI) is evaluated. Frequency and time domain characteristics of the filters are obtained using the finite-difference time-domain (FDTD) and finite element (FEM) methods. N-norms and eye diagrams are analyzed to comprehensively assess EMI attenuation and its impact on signal integrity. The results show that LPF1 exhibits a smaller passband compared to LPF2 and LPF3. However, despite significantly smaller dimensions, LPF1 demonstrates the highest attenuation coefficient for both UWB and NB EMI in the time domain. In terms of signal integrity, LPF1 shows superior performance at data rates up to 2 Gbps due to its stable group delay values in the frequency range from 0 to 2.2 GHz.