Rotman Lens-Based Combline Series-Feed Beam Steering Antenna Array for 5G IoT Applications
| Authors | A. Srinag1, S. Aruna2, K. Srinivasa Naik3 |
| Affiliations |
1Department of ECE, Vasireddy Venkatadri Institute of Technology, Andhra Pradesh, India 2Department of ECE, Andhra University College of Engineering Andhra Pradesh, India 3Department of ECE, Vignan’s Institute of Information Technology, Visakhapatnam, Andhra Pradesh, India |
| Е-mail | srinag.rs@andhrauniversity.edu.in |
| Issue | Volume 17, Year 2025, Number 6 |
| Dates | Received 04 August 2025; revised manuscript received 18 December 2025; published online 19 December 2025 |
| Citation | A. Srinag, S. Aruna, K. Srinivasa Naik, J. Nano- Electron. Phys. 17 No 6, 06023 (2025) |
| DOI | https://doi.org/10.21272/jnep.17(6).06023 |
| PACS Number(s) | 07.05.Tp, 84.40.Ba |
| Keywords | Internet of Things (IoT), Rotman lens, Combline series feed array. |
| Annotation |
This article presents a cost-effective and low-profile planar radiating system specifically designed for Internet of Things (IoT) applications operating at 5 GHz. The proposed system provides a beam coverage angle of 35°, utilizing a beamforming (Rotman) lens in combination with a combline array antenna to achieve efficient directional radiation. The configuration incorporates a beamforming lens with four input ports and six output ports, enabling the generation of four controllable beams at angles of 0°, 12°, 23°, and 35°. This ensures flexible beam steering for improved coverage in IoT networks. The combline series-fed antenna array is carefully designed to minimize side lobes while maintaining a compact size, making it particularly suitable for Wi-Fi and other 5 GHz applications. To enhance directivity, the design employs the Villeneuve array method, which optimizes beam shaping and energy distribution. Both the beamforming lens and combline prototypes are fabricated separately using an FR4 substrate, ensuring a cost-effective and practical manufacturing process. The combined beam-steering lens and combline microstrip array achieve a measured gain of 15 dBi at 5 GHz, demonstrating high efficiency and performance. The close agreement between simulated and measured results validates the effectiveness of the proposed system. With its simplified design, ease of fabrication, and strong performance, this system presents a promising solution for next-generation IoT applications requiring directional beamforming capabilities. |
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