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Propagation Speed of Electromagnetic Waves01:30

Propagation Speed of Electromagnetic Waves

Electromagnetic waves are consistent with Ampere's law. Assuming there is no conduction current Ampere's law is given as:
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Consider two sources of sound, that may or may not be in phase, emitting waves at a single frequency, and consider the frequencies to be the same.
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Passive Filters01:27

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Simulation, Fabrication and Characterization of THz Metamaterial Absorbers
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Multipath Signal-Selective Metasurface: Passive Time-Varying Interlocking Mechanism to Vary Spatial Impedance for

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New metasurface spatial filters passively suppress electromagnetic multipath interference by adjusting impedance for different signal angles. This overcomes limitations of traditional systems, enabling selective EM wave control.

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Area of Science:

  • Metamaterials and Metasurfaces
  • Electromagnetic Wave Propagation
  • Signal Processing

Background:

  • Electromagnetic (EM) multipath interference poses challenges due to shared frequencies and variable incident angles.
  • Classic linear time-invariant (LTI) systems cannot adjust spatial impedance to counter these effects.

Purpose of the Study:

  • To introduce a novel design for metasurface-based spatial filters.
  • To overcome LTI system limitations and suppress EM multipath interference signals.

Main Methods:

  • Proposed filters utilize a time-varying interlocking mechanism with metasurface panels and MOSFETs.
  • These filters adjust spatial impedance to selectively accept the first incoming wave and reject delayed waves.

Main Results:

  • Numerical and experimental validation demonstrated a shielding effectiveness exceeding 10 dB.
  • The filters successfully suppressed time-delayed EM waves from different angles.

Conclusions:

  • The study presents a new passive, time-varying selective EM metasystem concept.
  • This approach enables control over complex EM waves and fields, even at identical frequencies.