Experiments Validating the Effectiveness of Multi-point Wireless Energy Transmission with Carrier Shift Diversity

TL;DR

This study experimentally validates a multi-point wireless energy transmission method with carrier shift diversity, significantly improving coverage and mitigating interference effects in indoor sensor network environments.

Contribution

The paper introduces a novel multi-point wireless energy transmission scheme with carrier shift diversity and experimentally demonstrates its superior coverage over traditional methods.

Findings

Proposed scheme overcomes path-loss limitations.

Carrier shift diversity reduces interference effects.

Enhanced energy coverage demonstrated in indoor experiments.

Abstract

This paper presents a method to seamlessly extend the coverage of energy supply field for wireless sensor networks in order to free sensors from wires and batteries, where the multi-point scheme is employed to overcome path-loss attenuation, while the carrier shift diversity is introduced to mitigate the effect of interference between multiple wave sources. As we focus on the energy transmission part, sensor or communication schemes are out of scope of this paper. To verify the effectiveness of the proposed wireless energy transmission, this paper conducts indoor experiments in which we compare the power distribution and the coverage performance of different energy transmission schemes including conventional single-point, simple multi-point and our proposed multi-point scheme. To easily observe the effect of the standing-wave caused by multipath and interference between multiple wave sources, 3D measurements are performed in an empty room. The results of our experiments together with those of a simulation that assumes a similar antenna setting in free space environment show that the coverage of single-point and multi-point wireless energy transmission without carrier shift diversity are limited by path-loss, standing-wave created by multipath and interference between multiple wave sources. On the other hand, the proposed scheme can overcome power attenuation due to the path-loss as well as the effect of standing-wave created by multipath and interference between multiple wave sources.