Amirkabir University of Technology AUT Journal of Electrical Engineering 2588-2910 Articles in Press 2026 08 09 Dual - Band Monopole Antenna for WLAN, Sub-6 GHz and IoT Applications 6145 10.22060/eej.2026.25184.5861 EN Kunwar Raghvendra Singh B.Tech. Student, Department of Electronics Engineering, Institute of Engg. & Rural Technology, Prayagraj, India Yatindra Gaurav Head of Department of Electronics Engineering, Institute of Engg. & Rural Technology, Prayagraj, India 0000-0001-7170-6658 Journal Article 2025 11 26 This paper proposes a dual-band rectangular stub-loaded monopole antenna suitable for Sub - 6 GHz and IoT uses. The proposed antenna employs a rectangular radiating patch with two incorporated rectangular stubs and two rectangular slots to provide wideband impedance matching and dual-frequency operation. The antenna is fabricated on a Roger RO3003 substrate on compact dimensions of 50 × 50 × 1.524 mm³ along with a 50 Ω microstrip feedline to effect good impedance matching. The measured S₁₁ results have shown two distinct operating band: 2.2GHz–2.6 GHz and 3.0GHz–4.9 GHz, with an exceptional return loss of –68.57 dB at 4.22 GHz, exhibiting excellent impedance matching. The suggested antenna exhibits a top gain of 2.72 dBi & total efficiency up to 97.8% that promises very good radiation performance. Due to its small size, high efficiency, and excellent impedance characteristics, the antenna is highly appropriate for IoT, WLAN, and Sub-6 GHz wireless communication systems. https://eej.aut.ac.ir/article_6145_d785bf9067f8af9e078b93cf26de2b54.pdf