Scholarlink

<p>Currently, terahertz (THz) filters face challenges such as narrow bandwidth and insufficient tuning capability, which hinder their applications in THz communication and sensing. To address these issues, this paper proposes a tunable ultra-wideband THz metamaterial filter based on vanadium dioxide (VO<sub>2</sub>). The filter comprises a three-layer periodic structure: the front and back layers are VO<sub>2</sub>-metal composite layers, the middle layer is a metal mesh layer, and each layer is separated by polyimide dielectric spacers. The physical mechanism is elucidated through impedance matching theory and the equivalent circuit model. When VO<sub>2</sub> is in the insulating state, the filter exhibits ultra-wideband bandpass characteristics with a transmission coefficient exceeding 90% in the frequency range of 3.15–8.81 THz, achieving a relative bandwidth of 116% and shielding effectiveness below 1&#xa0;dB within the passband. When VO<sub>2</sub> transitions to the metallic state upon heating, the transmission coefficient drops below 15% across 0.1–8.78 THz, with a maximum transmission modulation depth of 91.5%. Additionally, the SE exceeds 20&#xa0;dB within 0.1–8.72 THz. The filter demonstrates excellent polarization insensitivity and angular stability for transverse electric and transverse magnetic polarization modes. Featuring a simple structural design, wide passband, and tunability, this filter holds significant application potential in 6G communication and electromagnetic shielding.</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

A tunable ultra-wideband terahertz metamaterial filter based on vanadium dioxide

  • 期刊论文

  • 发表日期：

    2025年10月13日

查看全文
  • Xianhua Yin,
  • Xinyang Meng,
  • Linkai Tang,
  • Huo Zhang,
  • An Li

摘要

Currently, terahertz (THz) filters face challenges such as narrow bandwidth and insufficient tuning capability, which hinder their applications in THz communication and sensing. To address these issues, this paper proposes a tunable ultra-wideband THz metamaterial filter based on vanadium dioxide (VO2). The filter comprises a three-layer periodic structure: the front and back layers are VO2-metal composite layers, the middle layer is a metal mesh layer, and each layer is separated by polyimide dielectric spacers. The physical mechanism is elucidated through impedance matching theory and the equivalent circuit model. When VO2 is in the insulating state, the filter exhibits ultra-wideband bandpass characteristics with a transmission coefficient exceeding 90% in the frequency range of 3.15–8.81 THz, achieving a relative bandwidth of 116% and shielding effectiveness below 1 dB within the passband. When VO2 transitions to the metallic state upon heating, the transmission coefficient drops below 15% across 0.1–8.78 THz, with a maximum transmission modulation depth of 91.5%. Additionally, the SE exceeds 20 dB within 0.1–8.72 THz. The filter demonstrates excellent polarization insensitivity and angular stability for transverse electric and transverse magnetic polarization modes. Featuring a simple structural design, wide passband, and tunability, this filter holds significant application potential in 6G communication and electromagnetic shielding.