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This paper presents a technique for miniaturizing planar antennas. A compact fractal slot antenna, based on the Square Koch geometry, is developed for 2.4 GHz Industrial, Scientific, and Medical (ISM) band applications. The initial design, created using Coplanar Waveguide (CPW) technology on a Rogers RT5870 substrate (dielectric constant 2.33, thickness 0.8 mm), has dimensions of 30 × 30 mm2 and operates at 4.8 GHz, achieving a miniaturization rate of 81%. In the second iteration, the Square Koch fractal curve is introduced to shift the resonance frequency to 2.4 GHz, while preserving the same antenna size of 30 × 30 mm2.

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Optimization and Performance Analysis of a Miniature Folded-Slot Antenna Utilizing Square Koch Fractal for the 2.4 GHz ISM Band

  • 会议论文

  • 发表日期：

    2026年

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  • Bouchra Ezzahry,
  • Faouzi Rahmani,
  • Loubna Rmili,
  • Mohammed Lamsalli,
  • Tajeddin Elhamadi,
  • Naima Amar Touhami

摘要

This paper presents a technique for miniaturizing planar antennas. A compact fractal slot antenna, based on the Square Koch geometry, is developed for 2.4 GHz Industrial, Scientific, and Medical (ISM) band applications. The initial design, created using Coplanar Waveguide (CPW) technology on a Rogers RT5870 substrate (dielectric constant 2.33, thickness 0.8 mm), has dimensions of 30 × 30 mm2 and operates at 4.8 GHz, achieving a miniaturization rate of 81%. In the second iteration, the Square Koch fractal curve is introduced to shift the resonance frequency to 2.4 GHz, while preserving the same antenna size of 30 × 30 mm2.