Scholarlink

<p>The time-domain coding metasurface (TDCM) offers a rapid and efficient approach for manipulating frequency spectra of electromagnetic waves. To date, not only finite-order harmonics can be generated and coded discretely, frequency modulation of continuous waves has also been investigated. However, limited phase-tuning speed still constrains the modulation bandwidth and practical applications. Here, we report a TDCM capable of nanosecond-level phase tuning as fast as 20 ns within a full 360° tuning cycle. Unlike conventional varactor-based approaches, the proposed TDCM adopts a reconfigurable PIN-diode array, reducing transition time between adjacent states to only several nanoseconds. Furthermore, this approach can be extended to <i>Ku</i>- and even millimeter-wave bands, overcoming the frequency constraint of varactors. To validate its effectiveness, we built a <i>C</i>-band frequency-modulated continuous-wave radar prototype with the metasurface as the signal generator. A high-quality 10-MHz-bandwidth FMCW signal was generated, enabling accurate measurement of a flying drone’s range and speed.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Nanosecond-level time-domain coding metasurface for radar signal generation

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年11月27日

查看全文
  • Boyang Qian,
  • Hanjun Zhao,
  • Xiaohua Zhu,
  • Peng Li,
  • Hong Hong,
  • Hui Chu,
  • Yong-Xin Guo

摘要

The time-domain coding metasurface (TDCM) offers a rapid and efficient approach for manipulating frequency spectra of electromagnetic waves. To date, not only finite-order harmonics can be generated and coded discretely, frequency modulation of continuous waves has also been investigated. However, limited phase-tuning speed still constrains the modulation bandwidth and practical applications. Here, we report a TDCM capable of nanosecond-level phase tuning as fast as 20 ns within a full 360° tuning cycle. Unlike conventional varactor-based approaches, the proposed TDCM adopts a reconfigurable PIN-diode array, reducing transition time between adjacent states to only several nanoseconds. Furthermore, this approach can be extended to Ku- and even millimeter-wave bands, overcoming the frequency constraint of varactors. To validate its effectiveness, we built a C-band frequency-modulated continuous-wave radar prototype with the metasurface as the signal generator. A high-quality 10-MHz-bandwidth FMCW signal was generated, enabling accurate measurement of a flying drone’s range and speed.