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XU Heng, XU Hong, QUAN Yinghui, et al. Spectral control mechanisms of electromagnetic scattering via time-domain digital coding metasurfaces[J]. Journal of Radars, in press. doi: 10.12000/JR26001
Citation: XU Heng, XU Hong, QUAN Yinghui, et al. Spectral control mechanisms of electromagnetic scattering via time-domain digital coding metasurfaces[J]. Journal of Radars, in press. doi: 10.12000/JR26001
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Spectral Control Mechanisms of Electromagnetic Scattering via Time-domain Digital Coding Metasurfaces

DOI: 10.12000/JR26001 CSTR: 32380.14.JR26001
  • 1.

    School of Electronic Engineering, Xidian University, Xi’an 710071, China

  • 2.

    Xi’an Key Laboratory of Advanced Remote Sensing, Xi’an 710071, China

  • 3.

    Hangzhou Institute of Technology, Xidian University., Hangzhou 311200, China

  • 4.

    State Key Laboratory of Millimeter Waves, Southeast University, Nanjing 210096, China

  • 5.

    Institute of Electromagnetic Space, Southeast University, Nanjing 210096, China

Funds:  The National Natural Science Foundation of China (62331019)
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    Abstract
  • Time-domain digital coding metasurfaces can reconstruct electromagnetic scattering spectra by temporally modulating the scattering states of constituent elements. This study investigates the scattering-spectrum characteristics of two typical modulation schemes, namely random modulation and periodic modulation, under finite-window discrete coding conditions. For random modulation, an analytical decomposition of the average energy spectrum into coherent and background terms is derived, and the effects of the statistical moments of the coding sequence on zero-frequency suppression and spectral spreading are clarified. For periodic modulation, the mapping between the Fourier coefficients of the modulation template and the energy allocation among harmonic orders is established, revealing the mechanism of harmonic energy reconstruction. Furthermore, incorporating full-wave simulated unit parameters enables analysis of performance variations in scattering-spectrum control under nonideal conditions.

     

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