Efficient Multi-Hop Wireless Power Transfer for the Indoor Environment
Janis Eidaks1, Romans Kusnins1, Ruslans Babajans1
1Institute of Microwave Engineering and Electronics, Riga Technical University, Azenes St. 12, LV-1048 Riga, Latvia.
Sensors (Basel, Switzerland)
|September 9, 2023
Summary
This study enhances wireless power transfer (WPT) efficiency for the Internet of Things (IoT) using a multi-hop approach. This method boosts received power at end sensor nodes, improving autonomous device operation.
Area of Science:
- Electrical Engineering
- Wireless Communication Systems
- Sensor Networks
Background:
- The proliferation of Internet of Things (IoT) and wireless sensor networks (WSN) necessitates efficient wireless powering solutions for autonomous devices.
- Existing wireless power transfer (WPT) methods face efficiency challenges, particularly for low-power autonomous systems.
- Advancements in wireless communication technologies offer potential solutions for improving WPT.
Purpose of the Study:
- To investigate the efficacy of a multi-hop (MH) concept for enhancing wireless power transfer (WPT) efficiency.
- To increase the received power at the end sensor node (ESN) in wireless sensor networks (WSN).
- To explore the application of signal amplification techniques within a multi-hop WPT framework.
Main Methods:
- Developed and fabricated a multi-hop node (MHN) prototype for WPT.
- Conducted experimental measurements and power transfer modeling in the sub-GHz frequency range.
- Evaluated WPT performance in both line-of-sight (LoS) and non-line-of-sight (NLoS) scenarios, including a 90-degree turn-on angle for NLoS.
- Proposed an efficient simulation approach for analyzing MH WPT technology and sensor node distribution.
Main Results:
- Demonstrated a functional multi-hop node (MHN) prototype through laboratory experiments.
- Measured received power and RF-DC converted voltage at the end sensor node (ESN) under various conditions.
- Validated the potential of the multi-hop WPT concept to improve power delivery efficiency.
- Showcased the utility of the simulation approach for optimizing wireless sensor node placement.
Conclusions:
- The multi-hop (MH) WPT strategy, leveraging signal amplification, effectively enhances power delivery to end sensor nodes (ESN).
- Experimental validation confirms the feasibility and benefits of MH WPT in both LoS and NLoS environments.
- The proposed simulation method provides a valuable tool for optimizing spatial distribution of wireless sensor nodes for improved WPT efficiency.
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