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Low-pass EMI Filter Based on Modal Distortions, Internal Reflections and Magnetodielectric Cover
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  • Yevgeniy Zhechev ,
  • Mikhail Murmansky ,
  • Nikita Pavlov ,
  • Sergey Vlasov ,
  • Vyacheslav Trubcheninov ,
  • Nikita Kuzmin ,
  • Vyacheslav Surkov
Yevgeniy Zhechev
Tomsk State University of Control Systems and Radioelectronics

Corresponding Author:[email protected]

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Mikhail Murmansky
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Nikita Pavlov
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Sergey Vlasov
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Vyacheslav Trubcheninov
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Nikita Kuzmin
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Vyacheslav Surkov
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The letter introduces the first highly miniaturized low-pass filter that combines the use of modal distortions, internal reflections, and magnetodielectric cover. The filter is implemented on an FR-4 printed circuit board with compact external dimensions of 17x14x0.25 (mm) covered with an elastic magnetodielectric material. We conducted electrodynamic simulations of this filter using FDTD in Keysight EMPro and FEM in COMSOL Multiphysics. To validate the simulation results, the filter prototype was designed, manufactured, and tested. The EMI attenuation in the range from 4 to 20 GHz was more than 42 dB. The standing wave coefficient in the passband did not exceed 1.5. The effectiveness of broadband and mesoband interference suppression was evaluated using N-norms analysis. Signal integrity was analyzed by exciting a pseudo-random bit sequence with data rates of 0.25 and 0.5 Gbps at the input of the filter. The examination of N-norms and eye diagrams confirms that the filter can be employed to protect signal circuits.