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Ansah, John Nyamekye
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Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Energy Engineering

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A Miniaturised Dual-Band Modified U-Shaped Monopole Antenna for 5G, Wi-Fi/WLAN/WiMAX and Ultra-Wideband Applications Ansah, John Nyamekye
Telecommunications, Computers, and Electricals Engineering Journal (TELECTRICAL) Vol 2, No 3: February 2025
Publisher : Faculty of Engineering, Universitas Tanjungpura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/telectrical.v2i3.89567

Abstract

This paper presents a miniaturised dual-band modified U-shaped monopole antenna for 5G, Wi-Fi/WLAN/WiMAX and ultra-wideband (UWB) applications.   The antenna is designed and optimised using computer simulation technology (CST) microwave studio (MWS) suite version 2019. It features a circular patch modified into a U-shape by introducing geometrical slots, which significantly contribute to achieving wide bandwidth. The patch is mounted on an FR-4 substrate with a 1.6 mm thickness and a 4.3 relative permittivity value. The antenna has an area of 50 × 50  and resonates at 2.45 GHz and 5.25 GHz, achieving return losses of -28.677 dB and -36.851 dB, with VSWR values of 1.0765 and 1.0292 at the respective operating frequencies. The corresponding gains are 2.282 dBi and 4.334 dBi, with directivity of 2.710 dBi and 5.206 dBi. It offers a huge impedance bandwidth of 7.564 GHz, effectively covering 2.0535-3.8333 GHz and 4.2158-10 GHz, which meet the operational requirements for 5G, Wi-Fi/WLAN/WiMAX and UWB applications. Additionally, the antenna measures 90.61% and 81.80% radiation efficiencies and 90.49% and 81.78% total efficiencies at the respective operating frequencies. The fractional bandwidths are 60.5% and 81.4% at 2.45 GHz and 5.25 GHz, respectively. Furthermore, the antenna exhibits an omnidirectional radiation pattern that demonstrates exceptional potential as a competitive solution for 5G, Wi-Fi/WLAN/WiMAX and UWB applications.
A Compact Dual-Band Cross-Notched T-Shaped Antenna for High-Efficiency 2.4/5.8 GHz Wi-Fi Energy Harvesting in Self-Powered IoT Devices Ansah, John Nyamekye
Telecommunications, Computers, and Electricals Engineering Journal (TELECTRICAL) Vol 3, No 3: February 2026
Publisher : Faculty of Engineering, Universitas Tanjungpura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/telectrical.v3i3.101650

Abstract

This paper presents a dual-band cross-notched T-shaped monopole antenna developed for efficient ambient RF energy harvesting in the 2.4 GHz and 5.8 GHz Wi-Fi bands. The antenna occupies a compact size of 40 40 1.6 mm³, making it suitable for space-constrained IoT and biomedical devices. The proposed antenna demonstrates excellent impedance matching, achieving S11 values of -23.225 dB at 2.4 GHz and -29.096 dB at 5.8 GHz, with corresponding VSWR values of 1.1483 and 1.0727, respectively. It achieves wide impedance bandwidths of 0.71 GHz (2.07–2.78) GHz and 1.78 GHz (5.07–6.85) GHz, yielding fractional bandwidths of 29.28% and 29.87%, ensuring stable operation across both Wi-Fi bands. The antenna measures gains of 2.10 dBi and 4.29 dBi, with directivities of 2.52 dBi and 4.58 dBi, supported by high radiation efficiencies of 90.78% and 93.43% at the two resonant frequencies. The cross-notched T-shape configuration contributes significantly to achieving compactness and enhanced electromagnetic performance, while strategically positioned rectangular notches at the upper-left and lower-right corners are instrumental in achieving dual-band operation. The results demonstrate the antenna’s strong suitability for RF energy harvesting, where high efficiency and wide impedance bandwidth are essential for maximising RF captured power. In summary, the proposed antenna provides a balanced combination of compact size, high radiation efficiency and broad bandwidth, establishing it as a robust candidate for the next-generation battery-less IoT and low-power medical systems.
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