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| Autores principales: | , , , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2025
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| Materias: | |
| Acceso en línea: | https://arxiv.org/abs/2503.06807 |
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| _version_ | 1866909683539771392 |
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| author | Deutschmann, Benjamin J. B. Muehlmann, Ulrich Kaplan, Ahmet Callebaut, Gilles Wilding, Thomas Cox, Bert Van der Perre, Liesbet Tufvesson, Fredrik Larsson, Erik G. Witrisal, Klaus |
| author_facet | Deutschmann, Benjamin J. B. Muehlmann, Ulrich Kaplan, Ahmet Callebaut, Gilles Wilding, Thomas Cox, Bert Van der Perre, Liesbet Tufvesson, Fredrik Larsson, Erik G. Witrisal, Klaus |
| contents | Wireless power transfer (WPT) is a promising service for the Internet of Things, providing a cost-effective and sustainable solution to deploy so-called energy-neutral devices on a massive scale. The power received at the device side from a conventional transmit antenna with a physically small aperture decays rapidly with the distance. New opportunities arise from the transition from conventional far-field beamforming to near-field beam focusing. We argue that a physically large aperture, i.e., large with respect to the distance to the receiver, enables a power budget that remains practically independent of distance. Distance-dependent array gain patterns allow focusing the power density maximum precisely at the device location, while reducing the power density near the infrastructure. Physical aperture size is a key resource in enabling efficient yet regulatory-compliant WPT. We use real-world measurements to demonstrate that a regulatory-compliant system operating at sub-10GHz frequencies can increase the power received at the device into the milliwatt range. Our empirical demonstration shows that power-optimal near-field beam focusing inherently exploits multipath propagation, yielding both increased WPT efficiency and improved human exposure safety. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_06807 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Physically Large Apertures for Wireless Power Transfer: Performance and Regulatory Aspects Deutschmann, Benjamin J. B. Muehlmann, Ulrich Kaplan, Ahmet Callebaut, Gilles Wilding, Thomas Cox, Bert Van der Perre, Liesbet Tufvesson, Fredrik Larsson, Erik G. Witrisal, Klaus Signal Processing Wireless power transfer (WPT) is a promising service for the Internet of Things, providing a cost-effective and sustainable solution to deploy so-called energy-neutral devices on a massive scale. The power received at the device side from a conventional transmit antenna with a physically small aperture decays rapidly with the distance. New opportunities arise from the transition from conventional far-field beamforming to near-field beam focusing. We argue that a physically large aperture, i.e., large with respect to the distance to the receiver, enables a power budget that remains practically independent of distance. Distance-dependent array gain patterns allow focusing the power density maximum precisely at the device location, while reducing the power density near the infrastructure. Physical aperture size is a key resource in enabling efficient yet regulatory-compliant WPT. We use real-world measurements to demonstrate that a regulatory-compliant system operating at sub-10GHz frequencies can increase the power received at the device into the milliwatt range. Our empirical demonstration shows that power-optimal near-field beam focusing inherently exploits multipath propagation, yielding both increased WPT efficiency and improved human exposure safety. |
| title | Physically Large Apertures for Wireless Power Transfer: Performance and Regulatory Aspects |
| topic | Signal Processing |
| url | https://arxiv.org/abs/2503.06807 |