volume | PIER Journals

Abstract

In this study, a compact, reconfigurable, and high-efficiency Long Range (LoRa) patch antenna, which is novel, is presented for Internet of Things (IoT) applications. The antenna is designed to operate at the three major frequencies used for LoRa communication, namely 915 MHz, 868 MHz, and 433 MHz, which are widely employed for global LoRa connectivity. The compact size and impedance matching of the antenna are achieved through the use of meandered radiating patches, a partial ground plane, and a ground plane stub. The antenna is prototyped on a commercially available and cost-effective FR-4 material and measures 80 mm x 50 mm x 1.6 mm (0.12λ x 0.07λ at the lowest resonant frequency), which is smaller than the size of a standard credit card. The antenna utilizes three RF PIN diodes (SW1, SW2, and SW3) for frequency reconfiguration, which are characterized by low insertion loss and fast switching time. The RLC equivalent circuit of the antenna was validated through simulations and measurements, yielding the peak gain and radiation efficiency of 2.1 dBi and >90%, respectively. These results prove that the antenna is a promising solution for LoRa IoT applications in terms of size, cost, and performance, filling a gap in the existing literature of LoRa MPAs that are typically large, non-reconfigurable, low-gain, and single-band.

1. Ayoub Kamal, M., M. M. Alam, A. A. Sajak, and M. Mohd Su'ud, "Requirements, deployments, and challenges of LoRa technology: A survey," Comput. Intell. Neurosci., 2023.

2. Edward, P., M. El-Aasser, M. Ashour, and T. Elshabrawy, "Interleaved chirp spreading LoRa as a parallel network to enhance LoRa capacity," IEEE Internet Things J., Vol. 8, No. 5, 2020.
doi:10.1109/JIOT.2020.3027100

3. Edward, P., S. Elzeiny, M. Ashour, and T. Elshabrawy, "On the coexistence of LoRa-and interleaved chirp spreading LoRa-based modulations," 2019 International Conference on Wireless and Mobile Computing, Networking and Communications (WiMob), 2019.

4. Opipah, S., H. Qodim, D. Miharja, E. A. Z. Hamidi, and T. Juhana, "Prototype design of smart home system base on LoRa," 2020 6th International Conference on Wireless and Telematics (ICWT), 2020.

5. El-Aasser, M., A. Gasser, M. Ashour, and T. Elshabrawy, "Performance analysis comparison between LoRA and frequency hopping-based LPWAN," 2019 IEEE Global Conference on Internet of Things (GCIoT), 2019.

6. Munirathinam, S., "Industry 4.0: Industrial Internet of Things (IIOT)," Advance in Computers, Vol. 117, No. 1, 129-164, 2020.
doi:10.1016/bs.adcom.2019.10.010

7. Swamy, S. N. and S. R. Kota, "An empirical study on system level aspects of Internet of Things (IoT)," IEEE Access, Vol. 8, 188082-188134, 2020.
doi:10.1109/ACCESS.2020.3029847

8. Chaudhary, S., R. Johari, R. Bhatia, K. Gupta, and Bhatnagar, "CRAIoT: Concept, review and application(s) of IoT," 2019 4th International Conference on Internet of Things: Smart Innovation and Usages (IoT-SIU), 2019.

9. Masuk, A., O. M. Kende, A. Husam, and I. Balajti, "Cyber-physical system aspects of microstrip patch antenna of radar sensor application," 2022 23rd International Radar Symposium (IRS), 2022.

10. Moradi, A. and T. B. A. Rahman, "Broadband modified rectangular microstrip patch antenna using stepped cut at four corners method," Progress In Electromagnetics Research, Vol. 137, 599-619, 2013.

11. Dala, A. and T. Arslan, "Design, implementation, and measurement procedure of underwater and water surface antenna for Lora communication," Sensors, Vol. 21, No. 4, 1337, 2021.
doi:10.3390/s21041337

12. Zhang, Q. and Y. Gao, "Embedded antenna design on LoRa radio for IoT applications," 12th European Conference on Antennas and Propagation, London, UK, Apr. 2018.

13. Boursianis, A. D., M. S. Papadopoulou, J. Pierezan, V. C. Mariani, L. S. Coelho, P. Sarigiannidis, S. Koulouridis, and S. K. Goudos, "Multiband patch antenna design using nature-inspired optimization method," IEEE Open Journal of Antennas and Propagation, 151-162, 2020.

14. Krishna, M. V. and G. S. N. Raju, "Triangle shaped antenna design for IoT-based Lorawan applications," SAMRIDDHI: A Journal of Physical Sciences, Engineering and Technology, Vol. 13, No. 1, 8-11, 2021.
doi:10.18090/samriddhi.v13i01.3

15. Musa, U., S. M. Shah, H. A. Majid, Z. Z. Abidin, M. S. Yahya, S. Babani, and Z. Yunusa, "Recent advancement of wearable reconfigurable antenna technologies: A review," IEEE Access, Vol. 10, 121831-121863, 2022.
doi:10.1109/ACCESS.2022.3222782

16. Pourziad, A., S. Nikmehr, and H. Veladi, "A novel multi-state integrated RF MEMS switch for reconfigurable antennas applications," Progress In Electromagnetics Research, Vol. 139, 389-406, 2013.
doi:10.2528/PIER13012303

17. Ullah, S., S. Ahmad, and B. A. Khan, "A multi-band switchable antenna for Wi-Fi, 3G advanced, WiMAX, and WLAN wireless applications," International Journal of Microwave and Wireless Technologies, Vol. 10, No. 8, 991-997, 2018.
doi:10.1017/S1759078718000776

18. Awaleh, A. A., S. H. Dahlan, and M. Z. M. Jenu, "Equivalent electrical lumped component modeling of e-shaped patch flat lens antenna unit cell," 2014 IEEE Asia-Pacific Conference on Applied Electromagnetics (APACE), 2014.

Mr. Muhammad Sani Yahya

Dr. Socheatra Soeung

Dr. Francis Emmanuel Chinda

Dr. Sharul Kamal Bin Abd Rahim

Dr. Umar Musa

Dr. Nursyarizal B. M. Nor

Dr. Sovuthy Cheab