rf-energy harvesting

RF – Energy Harvesting

By: Belal Essam

8 January 2017

Agenda• Conventional Powered Communication Networks.

• Naturally Powered Communication Networks (Energy Harvesting).

• Wireless Power Transfer, The Early Trials.

• Wireless Powered Communication Networks (RF-Energy Harvesting).

• Research directions in RF-Energy Harvesting.

• Wireless Powered Communication Networks Applications.

8 January 2017

Conventional Powered Communication Networks

• Need manual battery recharging/replacement.

• Inapplicable in some scenarios• Body sensors,

• sensors in dangerous environment (Volcanos, … etc.)

• Costly inefficient.

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Source: Rui Zhang “Wireless Powered Communication Networks: An Overview”, WCNC , April 2016.

Naturally Powered Communication Networks (Energy Harvesting)

• Energy source (renewable)• Sun, Wind, …, etc.

• Costly inefficient.

• Bulky (big size).

• Not on-demand (uncontrollable).

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Wireless Power Transfer, The Early Trials

• “Wardenclyffe Tower”, also known as (aka) the “Tesla Tower”.

• A Wireless transmission station designed and built by Nikola Tesla in New York in 1901.

• Tesla intended to transmit messages, telephony and even facsimile images across the Atlantic to England and to ships at sea.

• Intended for wireless power transfer at 150 KHz and 300 kW, un-succeeded and never put in practice.

• Additional investment could not be found and the project was abandoned in 1906 and never became operational.

8 January 2017

Wireless Powered Communication Networks (RF-Energy Harvesting)• Small size receivers.

• On-demand charging (controllable).

• Cost efficient.

• Low efficiency, but Still underdevelopment.

• Reported that 3.5mW and 1uW of wireless power can be harvested from RF signals at distances of 0.6 and 11 meters, respectively, using Powercast RF energy harvester operating at 915MHz.

8 January 2017


Research directions in RF-Energy Harvesting

• Prototyping receiver architecture.

• Wireless energy transfer source.

• Different network architectures.

• Optimal resource allocation (time, frequency, power, …, etc.)

• Information/Energy mode exchange.

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Wireless energy transfer source

• Moving vehicles.

• Dedicated power beacons.

• Hybrid Access Points.

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Source: E. Hossain, et al., "Wireless-powered cellular networks: key challenges and solution techniques," in IEEE Comm. Mag.June 2015.

Information/Energy mode exchange

• Time switching receiver.

• Power splitting receiver.

• Antenna switching receiver.

8 January 2017

Source: Rui Zhang “Wireless Powered Communication Networks: An Overview”, WCNC , April

2016.

Wireless Powered Communication Networks Applications• Wireless Powered Cognitive Radio Network.

• Conventional network: SU is silent during PU transmission.

• Wireless powered network: SU harvests energy during PU transmission.

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Wireless Powered Communication Networks Applications• Different receivers sensitivities enable the design of such a network.

• Information decoding Rx: -60 dBm.

• Energy harvesting Rx: -10 dBm.

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References• Rui Zhang “Wireless Powered Communication Networks: An Overview”, WCNC ,

April 2016.

• H. Tabassum, E. Hossain, A. Ogundipe and D. I. Kim, "Wireless-powered cellular networks: key challenges and solution techniques," in IEEE Communications Magazine, vol. 53, no. 6, pp. 63-71, June 2015.

• A. M. Zungeru, L. M. Ang, S. Prabaharan, and K. P. Seng, “Radio frequency energy harvesting and management for wireless sensor networks,” Green Mobile Devices and Netw.: Energy Opt. Scav. Tech., CRC Press, pp. 341-368, 2012.

8 January 2017

8 January 2017

rf-energy harvesting

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