Transmission Model for Resonant Beam SWIPT with Telescope Internal Modulator

TL;DR

This paper proposes a resonant beam SWIPT system with an internal telescope modulator that enhances transmission distance and power efficiency for IoT devices, demonstrating significant improvements over traditional systems.

Contribution

Introduction of a telescope internal modulator in resonant beam SWIPT to suppress diffraction losses and extend transmission range with higher power and spectral efficiency.

Findings

Beam spot compression by TIM improves transmission distance.

TIM-RBS transmits energy twice as far as RBS without TIM.

Achieves 34m distance, 4W power, and 12bps/Hz spectral efficiency with 200W input.

Abstract

To satisfy the long-range and energy self-sustaining communication needs of electronic devices in the Internet of Things (IoT), we introduce a simultaneous wireless information and power transfer (SWIPT) system using the resonant beam that incorporates a telescope modulator inside a cavity for suppressing diffraction losses. We theoretically analyze power transfer in the resonant beam system with telescope internal modulator (TIM-RBS) considering the electromagnetic field propagation, the end-to-end (E2E) power transfer, and power and information reception. The numerical evaluation demonstrates that the TIM can effectively compress the beam spot, which allows the TIM-RBS to transmit energy twice as far as the RBS without TIM at higher power. Additionally, the largest transmission distance and maximum output power are proportional to the input power, and about 34m transmission distance, 4W electric power, and 12bps/Hz spectral efficiency can be achieved in the TIM-RBS with 200W input power. Hence, TIM-RBS can be considered as a promising option for realizing long-range, high-power, and high-rate SWIPT.