Abstract
This article discusses the methods used to design and analyze a small, flexible microstrip antenna for IoT devices. The antenna operates at 2.4 GHz, which is in the ISM band and is usually used for short-range communication. The radiating patch has a circular slot in it to acheive wide bandwidth and even current flow. To maintain stable antenna characteristics and prevent unwanted radiation from reaching the human body, a full ground plane is used. The bandwidth of the antenna is about 200 MHz, and the resonance frequency is 2.4 GHz with a return loss of about -28 dB. The radiation pattern of the antenna is quasi-omnidirectional with a maximum gain in the range of 3.2 to 3.5 dBi. The efficiency in open space is in the range of 80-85%, while when the antenna is in contact with the human body, it is more than 75%. The results of the bending analysis show that the performance of the antenna is almost unaffected by bending. Additionally, the SAR value is within the allowed range.
References
- Liao, Chia-Te, Zhe-Kai Yang, and Hua-Ming Chen. "Multiple Integrated Antennas for Wearable Fifth-Generation Communication and Internet of Things Applications." IEEE Access 9 (2021): 120328-120346.
- Ali Khan, Muhammad Usman, Raad Raad, Faisel Tubbal, Panagiotis Ioannis Theoharis, Sining Liu, and Javad Foroughi. "Bending Analysis of Polymer-Based Flexible Antennas for Wearable, General Iot Applications: A Review." Polymers 13, no. 3 (2021): 357.
- Al-Sehemi, Abdullah G., Ahmed A. Al-Ghamdi, Nikolay T. Dishovsky, Nikolay T. Atanasov, and Gabriela L. Atanasova. "Design of a Flexible Waterproof Antenna for Internet of Things Applications." Journal of Electromagnetic Waves and Applications 35, no. 7 (2021): 874-887.
- Hassan, Ali, N. Nizam Uddin, Asim Quddus, and Syed Rizwan Hassan. "Design, Optimization, and Validation of a Compact Wearable Antenna for Internet of Things Applications in Smart Textile." International Journal of Communication Systems 39, no. 4 (2026): e70433.
- Raktur, Hasin, and Tariq Jea. "Design of Compact Wideband Wearable Antenna for Health Care and Internet of Things System." National Journal of Antennas and Propagation 6, no. 1 (2024): 40-48.
- Mustaqim, Muhammad, Bilal A. Khawaja, Hassan T. Chattha, Kinza Shafique, Muhammad J. Zafar, and Mohsin Jamil. "Ultra‐Wideband Antenna for Wearable Internet of Things Devices and Wireless Body Area Network Applications." International Journal of Numerical Modelling: Electronic Networks, Devices and Fields 32, no. 6 (2019): e2590.
- De, Arnab, Bappadittya Roy, Ankan Bhattacharya, and Anup Kumar Bhattachaqee. "Bandwidth-Enhanced Ultra-Wide Band Wearable Textile Antenna for Various WBAN and Internet of Things (IoT) Applications." Radio Science 56, no. 11 (2021): 1-16.
- Ali, Usman, Sadiq Ullah, Babar Kamal, Ladislau Matekovits, and Amir Altaf. "Design, Analysis and Applications of Wearable Antennas: A Review." Ieee Access 11 (2023): 14458-14486.
- Atanasov, Nikolay Todorov, Blagovest Nikolaev Atanasov, and Gabriela Lachezarova Atanasova. "Flexible Wearable Antenna for IoT-based Plant Health Monitoring." Electronics 13, no. 15 (2024): 2956.
- Soni, Gaurav Kumar, Dinesh Yadav, Ashok Kumar, and Lokesh Sharma. "Flexible Antenna Design for Wearable IoT Devices." In 2023 3rd International Conference on Technological Advancements in Computational Sciences (ICTACS), IEEE, 2023, 863-867.