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<p>Spacetime crystals are a class of engineered materials characterized by simultaneous periodic modulation in both spatial and temporal dimensions, enabling concurrent control of frequency and wavevector in harmonic radiation. Existing studies have focused mainly on single-frequency excitation, leaving the manipulation of passband signals within spacetime crystals largely unexplored. Here, we establish a transfer matrix to calculate the band structure of a spacetime crystal antenna and systematically investigate its capability to manage passband signals. We also propose a modulation scheme that achieves approximately sideband-free radiation of loaded signals, thereby furnishing reliable channels for communication systems. Experiments validate that the method emits passband signals without producing undesirable sidebands. Furthermore, we demonstrate successful transmission of signals with a 20 MHz bandwidth under high modulation frequencies, confirming feasibility under practical operating conditions. Our method paves the way for implementing bandwidth-oriented frequency-division techniques in future 6G communication systems and holds strong potential for practical deployment.</p>

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Spacetime crystals engineering sideband-free radiation for high-rate transmission

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年12月2日

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  • Chen Zhang,
  • Zhiqiang Wu,
  • Zhenyu Jiang,
  • Zhuochao Tie,
  • Qunchao Ma,
  • Jingkun Zhuang,
  • Ziyan Zhang,
  • Jijin Wang,
  • Qi Hu,
  • Guanxue Wang,
  • Songlin Zhuang,
  • Qingqing Cheng

摘要

Spacetime crystals are a class of engineered materials characterized by simultaneous periodic modulation in both spatial and temporal dimensions, enabling concurrent control of frequency and wavevector in harmonic radiation. Existing studies have focused mainly on single-frequency excitation, leaving the manipulation of passband signals within spacetime crystals largely unexplored. Here, we establish a transfer matrix to calculate the band structure of a spacetime crystal antenna and systematically investigate its capability to manage passband signals. We also propose a modulation scheme that achieves approximately sideband-free radiation of loaded signals, thereby furnishing reliable channels for communication systems. Experiments validate that the method emits passband signals without producing undesirable sidebands. Furthermore, we demonstrate successful transmission of signals with a 20 MHz bandwidth under high modulation frequencies, confirming feasibility under practical operating conditions. Our method paves the way for implementing bandwidth-oriented frequency-division techniques in future 6G communication systems and holds strong potential for practical deployment.