Rohim Aminullah Firdaus, Ersyzario Edo Yunata, Adella Januar Safitria, Muhimmatul Khoiro, Nanang Winarno, Folin Oktafiani, Rini Khamimatul Ula, Riski Ramadani
The digitalization era and Internet of Things (IoT) applications require antennas with wide bandwidth, compact size, and stable impedance matching for reliable wireless communication. However, previously reported rectangular bowtie antennas still exhibit limitations, including narrow bandwidth, high return loss, and improper resonance frequency for IoT applications. This study proposes a rectangular slotted bowtie (RSB) antenna integrated with an inset-fed technique, which represents the main novelty of this work. The proposed design combines geometric optimization of bowtie slots with inset feed positioning to simultaneously improve impedance matching, bandwidth, and return loss performance. The antenna was designed and analyzed using the Finite Difference Time Domain (FDTD) method and fabricated on an FR-4 substrate. The results show that the proposed antenna operates at 2.41 GHz with improved impedance matching and radiation characteristics. The antenna achieves a return loss of −39.4 dB, VSWR of 1.04, bandwidth of 3.06 GHz, and gain of 2.160 dBi. Compared with previously reported bowtie antennas, the proposed design offers a more compact size and wider bandwidth while maintaining stable gain performance. These improvements demonstrate that the rectangular slotted bowtie inset-fed antenna provides enhanced performance for IoT communication systems and supports reliable high-speed data transmission in wireless applications. © 2026 IAMOT.
Physics Department, Faculty of Mathematics and Natural Sciences, State University of Surabaya, Surabaya, Indonesia; Physics Department Sepuluh Nopember Institute of Technology, Surabaya, Indonesia; Department of Science Education Universitas Pendidikan Indonesia, Bandung, Indonesia; Research Center for Telecommunication National Research and Innovation Agency, Bandung, Indonesia; Research Center for Electronics National Research and Innovation Agency, Bandung, Indonesia
