NONE 20260216132152683 wseas/wseas content-registration-form+ja@crossref.org content-registration-form WSEAS TRANSACTIONS ON COMMUNICATIONS 1109-2742 2224-2864 Abraham Enriquez Hernández Electronics Department, Metropolitan Autonomous University MEXICO Edgar Alejandro Andrade-Gonzalez Electronics Department, Metropolitan Autonomous University MEXICO Mario Reyes-Ayala Electronics Department, Metropolitan Autonomous University MEXICO Ignacio Vega Luna Electronics Department, Metropolitan Autonomous University MEXICO Hilario Terres-Peña Energy Department, Metropolitan Autonomous University MEXICO René Rodríguez Rivera Energy Department, Metropolitan Autonomous University MEXICO Sandra Chávez Sánchez Energy Department, Metropolitan Autonomous University MEXICO In this paper, a small fractal antenna is designed using an FR4 substrate for mobile applications. The antenna exhibits coupling in the LTE band of cellular systems (from 170 MHz to 3.8 GHz). The proposed antenna of size 60 x 60 mm is based on the Sierpinski carpet geometry with iteration degree of 3. The FR4 substrate dielectric constant is εr = 4.4, and the thickness of the substrate 1.544 mm. The fractal antenna was simulated by HFSS. 12 31 2025 12 31 2025 82 12 https://creativecommons.org/licenses/by/4.0/deed.en_US 10.37394/23204.2025.24.12 https://wseas.com/journals/communications/2025/a245104-011(2025).pdf O. Benkhadda, M. Saih, S. Ahmad, A. J. A. AlGburi, Z. Zakaria, K. Chaji and A. Reha, “A Miniaturized Tri-Wideband Sierpinski Hexagonal-Shaped Fractal Antenna for Wireless Communication Applications,” Fractal and Fractional, Vol. 7, No. 2, 115, pp. 1-18, 2023. DOI: 10.3390/fractalfract7020115. A. Kaur and J. S. Sivia, “A MIMO Antenna for 5G Wireless Applications, Designed with Hybrid Fractal Geometry and Incorporating CSRR Loading,” Progress In Electromagnetics Research (PIER), Vol. 156, pp. 243-252, 2025. DOI:10.2528/PIERC25030202. A. K. Vallappil, B. A. Khawaja, M. K. A. Rahim, M. Uzair, M. Jamil and Q. Awais, “Minkowski– Sierpinski Fractal Structure ‑ Inspired 2×2 Antenna Array for Use in Next‑ Generation Wireless Systems,” Fractal and Fractional, Vol. 7, No. 2, 158, pp. 1-18, 2023, DOI: 10.3390/fractalfract7020158. M. Hussain, A. Abbas, W. Awan, N. Abbas and I. Syeda, “Miniaturized Arrow-Shaped Flexible Filter-Embedded Antenna for Industrial and Medical Applications,” Applied Sciences, Vol. 14, No. 23, 11004, pp. 1-14, 2024. DOI:10.3390/app142311004. M. V. Nichita, M. A. Paun, V. A. Paun and V. P. Paun, “On the 5G Communications: Fractal‑ Shaped Antennas for PPDR Applications,” Complexity, Vol. 2021, pp. 1-12, 2021. DOI:10.1155/2021/9451730. K. Inamdar, P. Avhad and U. D. Dalal, “Fractal Metamaterial Inspired MSA for Wearable Devices,” 2019 IEEE Indian Conference on Antennas and Propagation (InCAP), India, pp. 1- 4, 2019, DOI:10.1109/InCAP47789.2019.9134528 L. R. Tan, Ch. Yanhuan, W. Duan and Z. Li, “Coplanar Waveguide Fed Roof-Shaped Multiband Antenna for WPAN Applications,” 5th International Conference on Circuits, Systems and Simulation (ICCSS), pp. 146-150, China, 2022, DOI: 10.1109/ICCSS55260.2022.9802137. P. Mohanty, S. Pandav and S. K. Behera, “Fractal T-Square Antenna for Radar Application,” 2024 IEEE Microwaves, Antennas, and Propagation Conference (MAPCON), India, 2024. DOI: 10.1109/MAPCON61407.2024.10923225. M. Marzouk, Y. Rhazi, I. H. Nejdi, F. E. Zerrad, M. Saih, S. Ahmad, A. Ghaffar and M. Hussein, “Ultra-Wideband Compact Fractal Antenna for WiMAX WLAN C and X Band Applications,” Sensors, Vol. 23, No. 9, pp. 1-14, 2023. DOI: DOI:10.3390/s23094254. P. A. Pathak, S. L. Nalbalwar, A. E. Wagh and J. L. Rajput, “A Fractal Approach to Investigate SAR of HMSA UWB Antenna for Medical Applications,” Progress In Electromagnetics Research (PIER), Vol. 154, pp.67-75, 2025. DOI: 10.2528/PIERC25022104.