Abstract
In this article, a compact 3-D beam-steering MIMO antenna operating at 5.75 GHz is proposed for on-body Internet-of-Things (IoT) applications. The planar antenna comprises a central patch and two concentric annular rings. The theory of spherical modes is used to discuss the beam-steering concept, where the free space measured beam-scanning covers the entire xy plane, while a 44° range is realized in xz and yz planes. The on-body performance is tested using a multilayer phantom, and the measured peak realized gain is 6.41 dBi. The antenna is characterized by compact size (0.77λ ), low profile (0.03λ ), Specific Absorption Rate (SAR) below the established limits, good efficiency, and 3-D beam-steering characteristics while operating in an on-body setup. Therefore, the proposed solution can enable advanced wireless applications like localization and physical layer security in emerging size-constrained on-body IoT devices.
| Original language | English |
|---|---|
| Pages (from-to) | 2241-2251 |
| Number of pages | 11 |
| Journal | IEEE Transactions on Antennas and Propagation |
| Volume | 72 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - 1 Mar 2024 |
Keywords
- Beam-steering antennas
- MIMO antennas
- on-body antennas
- planar antennas
- spherical modes