Abstract
This paper presents the compact dual-band non-planar, miniature Bluetooth antenna design for smartwatches targeting 2.45/5.8 GHz operation. The antenna features a straightforward structure that enhances bandwidth and efficiency without external matching circuits, addressing challenges like miniaturization using inductive meander lines, performance degradation due to human-body proximity, radiation obstruction from metal bezels, and strict size constraints, all while maintaining dual-band operation. The combination of an I-shaped monopole and an inverted U-shaped stripline demonstrates dual-resonance behavior, and simulations closely align with experimental measurements conducted at the microwave lab and StarLAB facility. The gain analysis demonstrates the antenna's ability to provide a Bluetooth range of 30 meters at 2.45 GHz and 10 meters at 5.8 GHz, supporting next-generation smartwatch integration with reliable connectivity.
| Original language | English |
|---|---|
| Title of host publication | EuCAP 2025 - 19th European Conference on Antennas and Propagation |
| Publisher | IEEE Institute of Electrical and Electronic Engineers |
| ISBN (Electronic) | 978-88-31299-10-7 |
| ISBN (Print) | 979-8-3503-6632-7 |
| DOIs | |
| Publication status | Published - 2025 |
| MoE publication type | A4 Article in a conference publication |
| Event | 19th European Conference on Antennas and Propagation, EuCAP 2025 - Stockholm, Sweden Duration: 30 Mar 2025 → 4 Apr 2025 |
Conference
| Conference | 19th European Conference on Antennas and Propagation, EuCAP 2025 |
|---|---|
| Country/Territory | Sweden |
| City | Stockholm |
| Period | 30/03/25 → 4/04/25 |
Funding
This work received funding from the European Union's Horizon 2020 MSCA-ITN-METAWIRELESS project under the Marie Skłodowska-Curie grant agreement No 956256 and the RCF-DoD Future Information Architecture for IoT initiative. The authors express gratitude to Dr. Rasmus Luomaniemi of Radientum Oy, Finland, for the valuable discussions on Bluetooth antenna for smartwatch applications. Research measurement infrastructure provided by Aalto Electronics-ICT was utilized for this work.
Keywords
- Bluetooth antenna
- Dual-band antenna
- small antennas
- smartwatch antenna
- wearable antenna
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