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<p>This study introduces a compact ultra-wideband (UWB) monopole antenna featuring adjustable multi-band rejection capabilities while considering the influence of a human body model on stop bands to optimize bandwidth performance. By incorporating two L-shaped slots into the ground plane, the antenna achieves an extensive bandwidth of up to 140% (3–17&#xa0;GHz). The adjustable triple-band rejection at 4.3&#xa0;GHz, 5.6&#xa0;GHz, and 6.5&#xa0;GHz is realized through the integration of two PIN diodes within a modified W-shaped slit, two Γ-shaped slits with PIN diodes on the radiating patch, and a T-shaped stub on the ground plane. With its compact dimensions (18&#xa0;mm × 12&#xa0;mm × 0.8&#xa0;mm), the antenna provides broad impedance bandwidth, cost-efficient fabrication, suitability for in-body microwave applications, and omnidirectional radiation characteristics in the H-plane. The prototype’s performance is evaluated based on VSWR and radiation pattern analysis, demonstrating that the proposed adjustable antenna is well-suited for various UWB applications.</p>

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An innovative in-body adjustable triple-band Notch UWB monopole antenna with improved bandwidth performance

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年7月8日

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  • Mousa Abdollahvand,
  • Mohammadreza Khorshidi,
  • Sima Sobhi-Givi,
  • Saptarshi Ghosh

摘要

This study introduces a compact ultra-wideband (UWB) monopole antenna featuring adjustable multi-band rejection capabilities while considering the influence of a human body model on stop bands to optimize bandwidth performance. By incorporating two L-shaped slots into the ground plane, the antenna achieves an extensive bandwidth of up to 140% (3–17 GHz). The adjustable triple-band rejection at 4.3 GHz, 5.6 GHz, and 6.5 GHz is realized through the integration of two PIN diodes within a modified W-shaped slit, two Γ-shaped slits with PIN diodes on the radiating patch, and a T-shaped stub on the ground plane. With its compact dimensions (18 mm × 12 mm × 0.8 mm), the antenna provides broad impedance bandwidth, cost-efficient fabrication, suitability for in-body microwave applications, and omnidirectional radiation characteristics in the H-plane. The prototype’s performance is evaluated based on VSWR and radiation pattern analysis, demonstrating that the proposed adjustable antenna is well-suited for various UWB applications.