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<p>A high-Q fan-shaped metasurface bandpass filter operating in the terahertz (THz) regime is presented. Full-wave simulations demonstrate a peak transmission coefficient of <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(-0.2\)</EquationSource> </InlineEquation> dB at 0.31 THz, a <InlineEquation ID="IEq2"> <EquationSource Format="TEX">\(-10\)</EquationSource> </InlineEquation> dB bandwidth of 25 GHz, and a Q-factor of 12.4. The obtained Q-factor exceeds that of conventional single-layer planar cross-shaped structures, indicating enhanced spectral selectivity. A reflection coefficient of <InlineEquation ID="IEq3"> <EquationSource Format="TEX">\(-24\)</EquationSource> </InlineEquation> dB confirms effective impedance matching. Continuous resonance tuning across the 0.28–0.38 THz range is achieved through geometric parameter variation without degradation of spectral characteristics. Simulations were conducted using CST Microwave Studio and validated with HFSS. The equivalent circuit of the proposed structure is modeled and analyzed using the Advanced Design System (ADS). The proposed structure serves as a compact spectral selection component for integration into THz-based spectroscopy applications.</p>

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Fan-shaped THz frequency selective surface narrowband bandpass filter

  • 期刊论文

  • 发表日期：

    2026年5月22日

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  • Anitha George,
  • P. Abdulla

摘要

A high-Q fan-shaped metasurface bandpass filter operating in the terahertz (THz) regime is presented. Full-wave simulations demonstrate a peak transmission coefficient of \(-0.2\) dB at 0.31 THz, a \(-10\) dB bandwidth of 25 GHz, and a Q-factor of 12.4. The obtained Q-factor exceeds that of conventional single-layer planar cross-shaped structures, indicating enhanced spectral selectivity. A reflection coefficient of \(-24\) dB confirms effective impedance matching. Continuous resonance tuning across the 0.28–0.38 THz range is achieved through geometric parameter variation without degradation of spectral characteristics. Simulations were conducted using CST Microwave Studio and validated with HFSS. The equivalent circuit of the proposed structure is modeled and analyzed using the Advanced Design System (ADS). The proposed structure serves as a compact spectral selection component for integration into THz-based spectroscopy applications.