Advances in Wireless Power Transfer using Large Arrays
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| Natura: | Recurso digital |
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2025
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| _version_ | 1866902013634150400 |
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| author | Van der Perre, Liesbet De Strycker, Lieven Cox, Bert Callebaut, Gilles |
| author_facet | Van der Perre, Liesbet De Strycker, Lieven Cox, Bert Callebaut, Gilles |
| contents | <p>Wireless power transfer (WPT) holds promise for enhancing device autonomy, especially in energy-limited Internet of Things (IoT) systems. A major hurdle remains the rapid decay of received power with distance when using small-aperture antennas. This talk explores how physically large antenna arrays—such as those found in cell-free and extremely large MIMO (XL-MIMO) systems, including RadioWeaves—enable a shift from far-field beamforming to near-field beam focusing, where the received power can remain nearly independent of distance. By shaping distance-adaptive gain patterns, large arrays can concentrate power at device locations while reducing unnecessary exposure elsewhere. This has direct implications for human safety, particularly to the Specific Absorption Rate (SAR)—a key regulatory constraint on electromagnetic energy absorption in biological tissue. Near-field focusing naturally aligns with SAR compliance by minimizing ambient exposure. The second part of the talk presents experimental results from the Techtile testbed—a distributed, large-scale antenna array platform for WPT in the near field. We compare coherent and non-coherent transmit diversity, demonstrating that fully synchronized beam focusing provides a 14 dB gain over non-coherent transmission, closely matching the theoretical 14.9 dB gain for a 31-element array. Furthermore, phase alignment errors below 20° result in less than 1 dB loss, while errors exceeding 40° cause performance degradation beyond 3 dB. This suggests that phase synchronization can be relaxed, and that scaling the number of antennas is a viable strategy to improve wireless power efficiency. While efficiency remains low, this work highlights a regulatory-compliant pathway toward distributed WPT for IoT deployments.</p> |
| format | Recurso digital |
| id | zenodo_https___doi_org_10_5281_zenodo_16316237 |
| institution | Zenodo |
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| publishDate | 2025 |
| publisher | Zenodo |
| record_format | zenodo |
| spellingShingle | Advances in Wireless Power Transfer using Large Arrays Van der Perre, Liesbet De Strycker, Lieven Cox, Bert Callebaut, Gilles Wireless Power Transfer Ambient IoT MIMO Near Field Communications <p>Wireless power transfer (WPT) holds promise for enhancing device autonomy, especially in energy-limited Internet of Things (IoT) systems. A major hurdle remains the rapid decay of received power with distance when using small-aperture antennas. This talk explores how physically large antenna arrays—such as those found in cell-free and extremely large MIMO (XL-MIMO) systems, including RadioWeaves—enable a shift from far-field beamforming to near-field beam focusing, where the received power can remain nearly independent of distance. By shaping distance-adaptive gain patterns, large arrays can concentrate power at device locations while reducing unnecessary exposure elsewhere. This has direct implications for human safety, particularly to the Specific Absorption Rate (SAR)—a key regulatory constraint on electromagnetic energy absorption in biological tissue. Near-field focusing naturally aligns with SAR compliance by minimizing ambient exposure. The second part of the talk presents experimental results from the Techtile testbed—a distributed, large-scale antenna array platform for WPT in the near field. We compare coherent and non-coherent transmit diversity, demonstrating that fully synchronized beam focusing provides a 14 dB gain over non-coherent transmission, closely matching the theoretical 14.9 dB gain for a 31-element array. Furthermore, phase alignment errors below 20° result in less than 1 dB loss, while errors exceeding 40° cause performance degradation beyond 3 dB. This suggests that phase synchronization can be relaxed, and that scaling the number of antennas is a viable strategy to improve wireless power efficiency. While efficiency remains low, this work highlights a regulatory-compliant pathway toward distributed WPT for IoT deployments.</p> |
| title | Advances in Wireless Power Transfer using Large Arrays |
| topic | Wireless Power Transfer Ambient IoT MIMO Near Field Communications |
| url | https://doi.org/10.5281/zenodo.16316237 |