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This study presents the design and performance analysis of a compact Vivaldi antenna tailored for medical imaging and broadband wireless applications. Leveraging ultra-wideband (UWB) technology, the antenna features a tapered slot structure and a linear feed, optimized using the Gibson method to achieve minimal impedance mismatches, enhanced radiation efficiency, and broad frequency coverage. Constructed on an FR4 substrate with compact dimensions of 35 mm × 25 mm, the antenna is well-suited for integration into modern compact devices. Simulation results validate the antenna’s wide operational bandwidth, spanning 3.37 GHz to 15.39 GHz, with effective impedance matching and a minimum S11 value of −70 dB at the resonance frequency of 8.754 GHz. Specific Absorption Rate (SAR) calculations at three key frequencies (6 GHz, 8.754 GHz, and 12 GHz) range from 1.2259 W/kg to 1.2539 W/kg in the absence of a tumor and increase by up to 3.58% with the presence of a tumor, remaining within international safety limits (2 W/kg for public exposure). Current density exhibits minimal variation (<2%), ensuring stable radiation efficiency. The antenna’s linear polarization minimizes mismatch losses and enhances signal reliability, complying with international standards.

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Design and Analysis of an Optimized Vivaldi Antenna for Medical Imaging and Broadband Wireless Applications

  • 会议论文

  • 发表日期：

    2026年

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  • Azize Bhaij,
  • Abderrahim haddad,
  • Redouane Jouali,
  • Khalid Sabri,
  • Mohssin Aoutoul

摘要

This study presents the design and performance analysis of a compact Vivaldi antenna tailored for medical imaging and broadband wireless applications. Leveraging ultra-wideband (UWB) technology, the antenna features a tapered slot structure and a linear feed, optimized using the Gibson method to achieve minimal impedance mismatches, enhanced radiation efficiency, and broad frequency coverage. Constructed on an FR4 substrate with compact dimensions of 35 mm × 25 mm, the antenna is well-suited for integration into modern compact devices. Simulation results validate the antenna’s wide operational bandwidth, spanning 3.37 GHz to 15.39 GHz, with effective impedance matching and a minimum S11 value of −70 dB at the resonance frequency of 8.754 GHz. Specific Absorption Rate (SAR) calculations at three key frequencies (6 GHz, 8.754 GHz, and 12 GHz) range from 1.2259 W/kg to 1.2539 W/kg in the absence of a tumor and increase by up to 3.58% with the presence of a tumor, remaining within international safety limits (2 W/kg for public exposure). Current density exhibits minimal variation (<2%), ensuring stable radiation efficiency. The antenna’s linear polarization minimizes mismatch losses and enhances signal reliability, complying with international standards.